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UNITED STATES
SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of
The Securities Exchange Act of 1934

November 15, 2004
Date of Report (Date of earliest event reported)

AMGEN INC.

(Exact name of registrant as specified in its charter)
         
Delaware   000-12477   95-3540776
(State or other jurisdiction   (Commission   (I.R.S. Employer
of incorporation or organization)   File Number)   Identification Number)
     
Amgen Inc.    
One Amgen Center Drive    
Thousand Oaks, CA   91320-1799
(Address of principal executive offices)   (Zip Code)

805-447-1000
(Registrant’s telephone number, including area code)

N/A
(Former name or former address, if changed since last report)

Check the appropriate box if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

     
o
  Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)
 
   
o
  Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)
 
   
o
  Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))
 
   
o
  Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))



 


TABLE OF CONTENTS

Item 1.01. Entry into a Material Definitive Agreement
Item 2.03 Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant
Item 9.01. Financial Statements and Exhibits
SIGNATURE
EXHIBIT INDEX
Exhibit 4.2
Exhibit 4.3
Exhibit 4.4
Exhibit 4.5
Exhibit 10.1


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Item 1.01. Entry into a Material Definitive Agreement

On November 18, 2004, Amgen Inc., a Delaware corporation (the “Company”), sold $1,000,000,000 in principal amount of the Company’s 4.00% Senior Notes due 2009 (the “2009 Notes”) and $1,000,000,000 in principal amount of the Company’s 4.85% Senior Notes due 2014 (the “2014 Notes”, and together with the 2009 Notes, the “Securities”). The Securities were sold pursuant to a Purchase Agreement, dated as of November 15, 2004 (the “Purchase Agreement”), among the Company and Morgan Stanley & Co. and Merrill Lynch, Pierce, Fenner & Smith Incorporated as representatives of the initial purchasers identified therein (collectively, the “Initial Purchasers”). The Securities were issued pursuant to an Indenture, dated as of August 4, 2003 (the “Indenture”), between the Company and JPMorgan Chase Bank, N.A., as trustee.

The Purchase Agreement provides that the Securities will be offered and sold to the Initial Purchasers and reoffered by the Initial Purchasers without being registered under the Securities Act of 1933, as amended (the “Securities Act”), in reliance on applicable exemptions from the registration requirements of the Securities Act.

The Initial Purchasers and their direct and indirect transferees will be entitled to the benefits of a Registration Rights Agreement, dated as of November 18, 2004 (the “Registration Rights Agreement”), between the Company and the Initial Purchasers. Pursuant to the Registration Rights Agreement, the Company has agreed to register the Securities under the Securities Act within a specified time or pay additional amounts to the holders of notes.

The Company intends to use the net proceeds from the offering, which were approximately $1.99 billion, primarily for purchases of shares of its common stock under its stock repurchase program and for general corporate purposes, including capital expenditures and working capital.

The 2009 Notes will bear interest at 4.00% per year and will mature on November 18, 2009. The 2014 Notes will bear interest at 4.85% per year and will mature on November 18, 2014. Interest on the Securities will be payable on May 18 and November 18 of each year, beginning on May 18, 2005. Interest on the Securities will be computed on the basis of a 360-day year consisting of twelve 30-day months and will accrue from November 18, 2004.

The Company has the right to redeem any or all of the Securities at any time pursuant to a make-whole provision. The Securities are not entitled to a sinking fund and the Holders of the Securities may not require the Company to repurchase the Securities.

The above descriptions of the Indenture, the Securities, the Purchase Agreement and the Registration Rights Agreement are summaries only and are qualified in their entirety by reference to the respective exhibits to this Current Report on Form 8-K.

Item 2.03 Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant

See disclosure under Item 1.01 of this report, which is incorporated by reference in this Item 2.03.

Item 9.01. Financial Statements and Exhibits

     
Exhibit No.
  Description
4.1
  Indenture, dated as of August 4, 2003, between the Company and JPMorgan Chase Bank, N.A., as trustee. (1)
 
   
4.2
  Officers’ Certificate of Amgen Inc. dated November 18, 2004, including forms of the Company’s 4.00% Senior Notes due 2009 and 4.85% Senior Notes due 2014.
 
   
4.3
  Form of 4.00% Senior Note due 2009.
 
   
4.4
  Form of 4.85% Senior Note due 2014.
 
   
4.5
  Registration Rights Agreement, dated as of November 18, 2004, among Amgen Inc. and Morgan Stanley & Co. and Merrill Lynch, Pierce, Fenner & Smith Incorporated as representatives of the several initial purchasers.
 
   
10.1
  Purchase Agreement, dated as of November 15, 2004, among Amgen Inc. and Morgan Stanley & Co. and Merrill Lynch, Pierce, Fenner & Smith Incorporated as representatives of the several initial purchasers.
 
   


(1) Filed as an exhibit to Form S-3 Registration Statement dated August 4, 2003 and incorporated herein by reference.

 


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SIGNATURE

Pursuant to the requirements of the Securities Exchange Act of 1934, as amended, the Registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

         
  AMGEN INC.
 
 
Date: November 18, 2004  By:   /s/ Richard D. Nanula    
  Name:   Richard D. Nanula   
  Title:   Executive Vice President and Chief Financial Officer   
 

 


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EXHIBIT INDEX

     
Exhibit    
Number
  Document Description
4.1
  Indenture, dated as of August 4, 2003, between the Company and JPMorgan Chase Bank, N.A., as trustee. (1)
 
   
4.2
  Officers’ Certificate of Amgen Inc. dated November 18, 2004, including forms of the Company’s 4.00% Senior Notes due 2009 and 4.85% Senior Notes due 2014.
 
   
4.3
  Form of 4.00% Senior Note due 2009.
 
   
4.4
  Form of 4.85% Senior Note due 2014.
 
   
4.5
  Registration Rights Agreement, dated as of November 18, 2004, among Amgen Inc. and Morgan Stanley & Co. and Merrill Lynch, Pierce, Fenner & Smith Incorporated as representatives of the several initial purchasers.
 
   
10.1
  Purchase Agreement, dated as of November 15, 2004, among Amgen Inc. and Morgan Stanley & Co. and Merrill Lynch, Pierce, Fenner & Smith Incorporated as representatives of the several initial purchasers.
 
   


(1) Filed as an exhibit to Form S-3 Registration Statement dated August 4, 2003 and incorporated herein by reference.

 

EXHIBIT 4.2 OFFICERS' CERTIFICATE OF AMGEN INC. Dated as of November 18, 2004 The undersigned officers of the Company certify, pursuant to resolutions duly adopted by the Board of Directors of the Company at a meeting duly held on October 5, 2004, and the unanimous written consent of the Offering Committee of the Board of Directors, dated as of November 15, 2004 (collectively, the "RESOLUTIONS"), and in accordance with Sections 2.1, 2.2 and 2.3 of the Indenture, dated as of August 4, 2003 (the "INDENTURE"; capitalized terms used herein and not otherwise defined shall have the meanings given to them in the Indenture), between Amgen Inc., a Delaware corporation (the "COMPANY"), and JPMorgan Chase Bank, N.A., as trustee, (the "TRUSTEE") the following matters related to the issuance of the Company's 4.00% Senior Notes due 2009 (the "2009 NOTES") and the Company's 4.85% Senior Notes due 2014 (the "2014 NOTES"): 1. Attached hereto as Annex A is a true and correct copy of a specimen note (the "FORM OF 2009 NOTE") representing the 2009 Notes and attached hereto as Annex B is a true and correct copy of a specimen note (the "FORM OF 2014 NOTE") representing the 2014 Notes. The Form of 2009 Note and the Form of 2014 Note are herein collectively referred to as the "FORMS OF NOTES." The Forms of Notes set forth certain of the terms required to be set forth in this Certificate pursuant to Section 2.2 of the Indenture, and said terms are incorporated herein by reference. The 2009 Notes and the 2014 Notes are each a separate series of Securities under the Indenture and are referred to herein collectively as the "NOTES." The term "Notes" shall also include any exchange notes issued in exchange for the 2009 Notes and 2014 Notes, respectively, pursuant to the transactions contemplated by that certain Registration Rights Agreement, dated as of November 18, 2004 (the "REGISTRATION RIGHTS AGREEMENT"), by and among the Company and the initial purchasers named therein (the "EXCHANGE SECURITIES"). 2. The title of the 2009 Notes shall be the "4.00% Senior Notes due 2009" and the title of the 2014 Notes shall be the "4.85% Senior Notes due 2014." 3. The 2009 Notes shall be issued at the initial offering price of 99.803% of the principal amount and the 2014 Notes shall be issued at the initial offering price of 99.984% of the principal amount. 4. The Company will initially issue $1.0 billion aggregate principal amount of 2009 Notes (except for 2009 Notes authenticated and delivered upon registration of transfer of, in exchange for, or in lieu of, other 2009 Notes pursuant to Sections 2.7, 2.8, 2.11, 3.6 or 9.6 of the Indenture) and the $1.0 billion aggregate principal amount of 2014 Notes (except for 2014 Notes authenticated and delivered upon registration of transfer of, in exchange for, or in lieu of, other 2014 Notes pursuant to Sections 2.7, 2.8, 2.11, 3.6 or

9.6 of the Indenture). The Company may issue additional 2009 Notes and/or 2014 Notes from time to time after the date hereof, and such Notes will be treated as part of the respective series of Notes for all purposes under the Indenture. 5. The Notes and the Exchange Securities shall be issued as Global Securities only and will be exchangeable for certificated notes ("CERTIFICATED NOTES") only if: (a) DTC (x) notifies the Company that it is unwilling or unable to continue as depository for the Global Securities or (y) at any time has ceased to be a clearing agency registered under the Exchange Act and, in either case, the Company fails to appoint a successor depository registered as a clearing agency under the Exchange Act within 90 days of such event; (b) the Company, at its option, notifies the Trustee in writing to the effect that the Company elects to cause the issuance of the Certificated Notes; or (c) there has occurred and is continuing an Event of Default with respect to the Notes. Certificated Notes delivered in exchange for any Global Security or beneficial interests in Global Securities will be registered in the names, and issued in any approved denominations, requested by or on behalf of the depository (in accordance with its customary procedures). 6. The Global Securities and the Certificated Notes will bear the following restrictive legend unless the legend is not required by applicable law, or as set forth in Item 7 below: "THIS NOTE HAS NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED (THE "SECURITIES ACT"), AND ACCORDINGLY, MAY NOT BE OFFERED OR SOLD WITHIN THE UNITED STATES OR TO, OR FOR THE ACCOUNT OR BENEFIT OF, U.S. PERSONS EXCEPT AS SET FORTH IN THE FOLLOWING SENTENCE. BY ITS ACQUISITION HEREOF, THE HOLDER (I) REPRESENTS THAT (A) IT IS A "QUALIFIED INSTITUTIONAL BUYER" (AS DEFINED IN RULE 144A UNDER THE SECURITIES ACT) OR (B) IT IS AN INSTITUTIONAL "ACCREDITED INVESTOR" (AS DEFINED IN RULE 501(a)(1), (2), (3) OR (7) OF REGULATION D UNDER THE SECURITIES ACT) (AN "INSTITUTIONAL ACCREDITED INVESTOR") OR (C) IT IS NOT A U.S. PERSON AND IS ACQUIRING THIS NOTE IN AN OFFSHORE TRANSACTION (AS DEFINED IN REGULATION S UNDER THE SECURITIES ACT) IN COMPLIANCE WITH REGULATION S UNDER THE SECURITIES ACT, (2) AGREES THAT IT WILL NOT, WITHIN THE TIME PERIOD REFERRED TO IN RULE 144(k) UNDER THE SECURITIES ACT AS IN EFFECT ON THE DATE OF THE TRANSFER OF THIS NOTE, RESELL OR OTHERWISE

TRANSFER THIS NOTE EXCEPT (A) TO THE ISSUER OR ANY SUBSIDIARY THEREOF, (B) TO A QUALIFIED INSTITUTIONAL BUYER IN COMPLIANCE WITH RULE 144A UNDER THE SECURITIES ACT, (C) INSIDE THE UNITED STATES TO AN INSTITUTIONAL ACCREDITED INVESTOR THAT, PRIOR TO SUCH TRANSFER, FURNISHES TO THE TRUSTEE A SIGNED LETTER CONTAINING CERTAIN REPRESENTATIONS AND AGREEMENTS RELATING TO THE RESTRICTIONS ON TRANSFER OF THIS NOTE (THE FORM OF WHICH LETTER CAN BE OBTAINED FROM THE TRUSTEE) AND IF SUCH TRANSFER IS IN RESPECT OF AN AGGREGATE PRINCIPAL AMOUNT OF NOTES OF LESS THAN $100,000, AN OPINION OF COUNSEL ACCEPTABLE TO THE ISSUER THAT SUCH TRANSFER IS IN COMPLIANCE WITH THE SECURITIES ACT, (D) OUTSIDE THE UNITED STATES IN AN OFFSHORE TRANSACTION IN COMPLIANCE WITH RULE 904 UNDER THE SECURITIES ACT, (E) PURSUANT TO THE EXEMPTION FROM REGISTRATION PROVIDED UNDER THE SECURITIES ACT (IF AVAILABLE) OR (F) PURSUANT TO AN EFFECTIVE REGISTRATION STATEMENT UNDER THE SECURITIES ACT AND IN EACH CASE IN ACCORDANCE WITH ANY APPLICABLE SECURITIES LAWS OF ANY STATE OF THE UNITED STATES. PRIOR TO ANY TRANSFER, THE HOLDER OF THIS SECURITY AGREES THAT IT WILL DELIVER TO EACH PERSON TO WHOM THIS NOTE IS TRANSFERRED A NOTICE SUBSTANTIALLY TO THE EFFECT OF THIS LEGEND. IN CONNECTION WITH ANY TRANSFER OF THIS NOTE WITHIN THE TIME PERIOD REFERRED TO IN RULE 144(k) UNDER THE SECURITIES ACT AFTER THE ORIGINAL ISSUANCE OF THE NOTES, THE HOLDER MUST CHECK THE APPROPRIATE BOX SET FORTH ON THE REVERSE HEREOF RELATING TO THE MANNER OF SUCH TRANSFER AND SUBMIT THIS CERTIFICATE TO THE TRUSTEE. IF THE PROPOSED TRANSFEREE IS AN INSTITUTIONAL ACCREDITED INVESTOR OR A NON-U.S. PERSON, THE HOLDER MUST, PRIOR TO SUCH TRANSFER, FURNISH TO THE TRUSTEE AND THE COMPANY SUCH CERTIFICATIONS, LEGAL OPINIONS OR OTHER INFORMATION AS EITHER OF THEM MAY REASONABLY REQUIRE TO CONFIRM THAT SUCH TRANSFER IS BEING MADE PURSUANT TO AN EXEMPTION FROM, OR IN A TRANSACTION NOT SUBJECT TO, THE REGISTRATION REQUIREMENTS OF THE SECURITIES ACT. AS USED HEREIN, THE TERMS "OFFSHORE TRANSACTION." "UNITED STATES" AND "U.S. PERSON" HAVE THE MEANINGS GIVEN TO THEM BY REGULATION S UNDER THE SECURITIES ACT. THE INDENTURE CONTAINS A PROVISION REQUIRING THE TRUSTEE TO REFUSE TO REGISTER ANY TRANSFER OF THIS NOTE IN VIOLATION OF THE FOREGOING RESTRICTION."

7. In accordance with the terms of the Exchange Offer (as defined in the Registration Rights Agreement), the Company will issue, and upon receipt of a written order in accordance with Section 2.3 of the Indenture, the Trustee will authenticate: a. One or more Global Securities in an aggregate principal amount equal to the principal amount of the beneficial interests in the Global Securities tendered into the Exchange Offer pursuant to the terms of the Registration Rights Agreement; and b. Certificated Notes in an aggregate principal amount equal to the principal amount of the Certificated Notes tendered into the Exchange Offer pursuant to the terms of the Registration Rights Agreement. Such Global Securities and Certificated Notes shall will not contain the restrictive legend set forth in Item 7 above. Concurrently with the issuance of such Exchange Securities, the Company will instruct the Trustee to cause the aggregate principal amount of the applicable Global Securities and Certificated Notes to be reduced accordingly. 8. The Notes shall be denominated in Dollars and payments of principal and interest shall be made in Dollars. 9. In addition to the covenants set forth in Article IV of the Indenture, the following additional covenants shall apply to the 2009 Notes and the 2014 Notes and shall be incorporated into the Indenture with respect to the 2009 Notes and the 2014 Notes, such additional covenants to be subject to covenant defeasance pursuant to Section 8.4 of the Indenture: "Section 4.5 LIMITATION ON LIENS. (a) The Company shall not, nor shall it permit any of its Subsidiaries to, create or incur any Lien on any of their respective Properties, whether now owned or hereafter acquired, or upon any income or profits therefrom, in order to secure any Indebtedness of the Company, without effectively providing that such series of Notes shall be equally and ratably secured until such time as such Indebtedness is no longer secured by such Lien, except: (1) Liens existing as of November 18, 2004 (the "CLOSING DATE"); (2) Liens granted after the Closing Date on any of the Company or any of its Subsidiaries' Properties securing Indebtedness of the Company created in favor of the Holders of the Notes; (3) Liens securing Indebtedness of the Company which are incurred to extend, renew or refinance Indebtedness which is secured by Liens permitted to be incurred under the Indenture; provided that those Liens do not extend to or cover any of the Company or any of its Subsidiaries' Property other than the Property securing the Indebtedness being refinanced and that the principal amount of such Indebtedness does not exceed the principal amount of the Indebtedness being refinanced;

(4) Liens created in substitution of or as replacements for any Liens permitted by the preceding clauses (1) through (3) directly above, provided that, based on a good faith determination of an Officer of the Company, the Property encumbered under any such substitute or replacement Lien is substantially similar in nature to the Property encumbered by the otherwise permitted Lien which is being replaced; and (5) Permitted Liens. (b) Notwithstanding the foregoing, the Company and any of its Subsidiaries may, without securing either series of Notes, create or incur Liens which would otherwise be subject to the restrictions set forth in the preceding paragraph, if after giving effect thereto, Exempted Debt does not exceed the greater of (x) 35% of Consolidated Net Worth calculated as of the date of the creation or incurrence of the Lien or (y) 35% of Consolidated Net Worth calculated as of the Closing Date. Section 4.6 LIMITATION ON SALE AND LEASE-BACK TRANSACTIONS. (a) The Company shall not and shall not permit its Subsidiaries to, enter into any sale and lease-back transaction for the sale and leasing back of any Property, whether now owned or hereafter acquired, of the Company or any Subsidiary of the Company, unless: (1) such transaction was entered into prior to the Closing Date; (2) such transaction was for the sale and leasing back of any Property by a Subsidiary of the Company to the Company; (3) such transaction involves a lease for less than three years; (4) the Company would be entitled to incur Indebtedness secured by a mortgage on the property to be leased in an amount equal to the Attributable Liens with respect to such sale and lease-back transaction without equally and ratably securing the Notes pursuant to Section 4.5; or (5) the Company applies an amount equal to the fair value of the proceeds of the Property sold to the purchase of Property or to the retirement of long-term Indebtedness of the Company or any of its Subsidiaries within 120 days of the effective date of any such sale and lease-back transaction. In lieu of applying such amount to such retirement, the Company may, or may cause any of its Subsidiaries to, deliver debt securities to the Trustee therefor for cancellation, such debt securities to be credited at the cost thereof to the Company. (b) Notwithstanding the foregoing, the Company and any of its Subsidiaries may enter into any sale lease-back transaction which would otherwise be subject to the foregoing restrictions if after giving effect thereto and at the time of determination, Exempted Debt does not exceed the greater of (a) 35% of Consolidated Net Worth calculated as of the closing date of the sale-leaseback transaction or (b) 35% of Consolidated Net Worth calculated as of the Closing Date.

10. In addition to the definitions set forth in Article I of the Indenture, each of the Notes shall include the following additional definitions, which, in the event of a conflict with the definition of terms in the Indenture, shall control: As used in this section, the following terms have the meanings set forth below. "Attributable Liens" means in connection with a sale and lease-back transaction the lesser of: (1) the fair market value of the assets subject to such transaction; and (2) the present value (discounted at a rate per annum equal to the average interest borne by all outstanding debt securities issued under the indenture (which may include debt securities in addition to the Notes) determined on a weighted average basis and compounded semi-annually) of the obligations of the lessee for rental payments during the term of the related lease. "Capital Lease" means any Indebtedness represented by a lease obligation of a Person incurred with respect to real property or equipment acquired or leased by such Person and used in its business that is required to be recorded as a capital lease in accordance with GAAP. "Consolidated Net Worth" means, as of any date of determination, the Stockholders' Equity of the Company and its Consolidated Subsidiaries on that date. "Consolidated Subsidiary" means, as of any date of determination and with respect to any Person, any Subsidiary of that Person whose financial data is, in accordance with GAAP, reflected in that Person's consolidated financial statements. "Credit Agreement" means the Credit Agreement, dated as of July 16, 2004, by and among the company, Citicorp USA, Inc., Barclays Bank PLC and each other financial institution party thereto, Citibank, N.A., as issuing bank, Citicorp USA, Inc., as administrative agent, and Barclays Bank PLC, as Syndication Agent, as such agreement may be amended (including any amendment, restatement, refinancing and successors thereof), supplemented or otherwise modified from time to time, including any increase in the principal amount of the obligations thereunder. "Credit Facilities" means, one or more debt facilities (including, without limitation, the Credit Agreement) or commercial paper facilities, in each case, with banks or other institutional lenders providing for revolving credit loans, term loans, receivables financing (including through the sale of receivables to such lenders or to special purpose entities formed to borrow from such lenders against such receivables) or letters of credit, in each case, as amended, restated, modified, renewed, refunded, replaced (whether upon or after termination or otherwise) or refinanced (including by means of sales of debt securities to institutional investors) in whole or in part from time to time.

"Exempted Debt" means the sum of the following as of the date of determination: (1) Indebtedness of the Company incurred after the Closing Date and secured by Liens not permitted by Section 4.5(a) above; and (2) Attributable Liens of the Company and any of its Subsidiaries in respect of sale and lease-back transactions entered into after the Closing Date pursuant to Section 4.6(b) above. "Governmental Agency" means: (1) any foreign, federal, state, county or municipal government, or political subdivision thereof; (2) any governmental or quasi-governmental agency, authority, board, bureau, commission, department, instrumentality or public body; (3) any court or administrative tribunal; (4) with respect to any Person, any arbitration tribunal or other nongovernmental authority to whose jurisdiction that Person has consented. "Hedging Obligations" means, with respect to any specified Person, the obligations of such Person under: (1) interest rate swap agreements (whether from fixed to floating or from floating to fixed), interest rate cap agreements and interest rate collar agreements; (2) other agreements or arrangements designed to manage interest rates or interest rate risk; and (3) other agreements or arrangements designed to protect such Person against fluctuations in currency exchange rates or commodity prices. "Indebtedness" of any Person means, without duplication, any indebtedness, whether or not contingent, in respect of borrowed money or evidenced by bonds, notes, debentures or similar instruments or letters of credit (or reimbursement agreements with respect thereto) or representing the balance deferred and unpaid of the purchase price of any Property (including pursuant to Capital Leases), except any such balance that constitutes an accrued expense or trade payable, if and to the extent any of the foregoing indebtedness would appear as a liability upon a balance sheet of such Person prepared on a consolidated basis in accordance with GAAP (but does not include contingent liabilities which appear only in a footnote to a balance sheet), and shall also include, to the extent not otherwise included, the guaranty of items which would be included within this definition. "Laws" means, collectively, all foreign, federal, state and local statutes, treaties, rules, regulations, ordinances, codes and administrative or controlling precedents of any Governmental Agency.

"Lien" means any lien, security interest, charge or encumbrance of any kind (including any conditional sale or other title retention agreement, any lease in the nature thereof, and any agreement to give any security interest). "Make-Whole Amount" means the excess of (1) the aggregate present value, on the redemption date, of the principal being redeemed or paid and the amount of interest (exclusive of interest accrued to the date of redemption or accelerated payment) that would have been payable if such redemption or accelerated payment had not been made, over (2) the aggregate principal amount of the Notes being redeemed or paid. Net present value shall be determined by discounting, on a semi-annual basis, such principal and interest at the Reinvestment Rate (as defined below and as determined on the third business day preceding the date such notice of redemption is given or declaration of acceleration is made) from the respective dates on which such principal and interest would have been payable if such redemption or accelerated payment had not been made. "Permitted Liens" means: (1) Liens securing Indebtedness under Credit Facilities; (2) Liens on accounts receivable, merchandise inventory, equipment, and patents, trademarks, trade names and other intangibles, securing Indebtedness of the Company; (3) Liens on any assets of the Company, any of its Subsidiaries' assets, or the assets of any joint venture to which the Company or any of its Subsidiaries is a party, created solely to secure obligations incurred to finance the refurbishment, improvement or construction of such asset, which obligations are incurred no later than 24 months after completion of such refurbishment, improvement or construction, and all renewals, extensions, refinancings, replacements or refundings of such obligations; (4) (a) Liens given to secure the payment of the purchase price incurred in connection with the acquisition (including acquisition through merger or consolidation) of Property (including shares of stock), including Capital Lease transactions in connection with any such acquisition, and (b) Liens existing on Property at the time of acquisition thereof or at the time of acquisition by the Company or one of its Subsidiaries of any Person then owning such Property whether or not such existing Liens were given to secure the payment of the purchase price of the Property to which they attach; provided that, with respect to clause (a), the Liens shall be given within 24 months after such acquisition and shall attach solely to the Property acquired or purchased and any improvements then or thereafter placed thereon; (5) Liens in favor of customs and revenue authorities arising as a matter of law to secure payment of customs duties in connection with the importation of goods; (6) Liens upon specific items of inventory or other goods and proceeds of any Person securing such Person's obligations in respect of bankers' acceptances issued or created for the account of such Person to facilitate the purchase, shipment or storage of such inventory or other goods;

(7) Liens securing reimbursement obligations with respect to letters of credit that encumber documents and other Property relating to such letters of credit and the products and proceeds thereof; (8) Liens on key-man life insurance policies granted to secure Indebtedness of the Company against the cash surrender value thereof; (9) Liens encumbering customary initial deposits and margin deposits and other Liens in the ordinary course of business, in each case securing Hedging Obligations and forward contract, option, futures contracts, futures options or similar agreements or arrangements designed to protect the Company or any of its Subsidiaries from fluctuations in interest rates, currencies or the price of commodities; (10) Liens arising out of conditional sale, title retention, consignment or similar arrangements for the sale of goods entered into by Company or any of its Subsidiaries in the ordinary course of business; (11) pre-existing Liens on assets acquired by the Company or any of its Subsidiaries after the Closing Date of the offering of the Notes; (12) Liens in favor of the Company or in favor of any of its Subsidiaries; (13) inchoate Liens incident to construction or maintenance of real property, or Liens incident to construction or maintenance of real property, now or hereafter filed of record for sums not yet delinquent or being contested in good faith, if reserves or other appropriate provisions, if any, as shall be required by GAAP shall have been made therefore; (14) statutory Liens arising in the ordinary course of business with respect to obligations which are not delinquent or are being contested in good faith, if reserves or other appropriate provisions, if any, as shall be required by GAAP shall have been made therefore; (15) Liens consisting of pledges or deposits to secure obligations under workers' compensation laws or similar legislation, including Liens of judgments thereunder which are not currently dischargeable; (16) Liens consisting of pledges or deposits of Property to secure performance in connection with operating leases made in the ordinary course of business to which Company or any of its Subsidiaries is a party as lessee, provided the aggregate value of all such pledges and deposits in connection with any such lease does not at any time exceed 16-2/3% of the annual fixed rentals payable under such lease; (17) Liens consisting of deposits of Property to secure statutory obligations of the Company or statutory obligations of any of its Subsidiaries in the ordinary course of its business; (18) Liens consisting of deposits of Property to secure (or in lieu of) surety, appeal or customs bonds in proceedings to which Company or any of its Subsidiaries is a party in the ordinary course of its business, but not in excess of $25,000,000;

(19) purchase money Liens or purchase money security interests upon or in any Property acquired or held by Company or any of its Subsidiaries in the ordinary course of business to secure the purchase price of such Property or to secure indebtedness incurred solely for the purpose of financing the acquisition of such Property; (20) Liens on an asset created in connection with the acquisition, construction or development of additions, extensions or improvements to such asset which shall be financed by obligations described in Sections 142, 144(a) or 144(c) of the Internal Revenue Code of 1986, as amended, or by obligations entitled to substantially similar tax benefits under other legislation or regulations in effect from time to time; and (21) Liens on Property subject to escrow or similar arrangements established in connection with litigation settlements. "Property" means any property or asset, whether real, personal or mixed, or tangible or intangible. "Reinvestment Rate" means for the 2009 Notes, 0.10% and for the 2014 Notes, means 0.15%, in each case plus the arithmetic mean of the yields under the respective heading "Week Ending" published in the most recent Statistical Release (as defined below) under the caption "Treasury Constant Maturities" for the maturity (rounded to the nearest month) corresponding to the remaining life to maturity, as of the payment date of the principal being redeemed or paid. If no maturity exactly corresponds to such maturity, yields for the two published maturities most closely corresponding to such maturity shall be calculated pursuant to the immediately preceding sentence and the Reinvestment Rate shall be interpolated or extrapolated from such yields on a straight-line basis, rounding in each of such relevant periods to the nearest month. For the purpose of calculating the Reinvestment Rate, the most recent Statistical Release published prior to the date of determination of the Make-Whole Amount shall be used. "Statistical Release" means the statistical release designated "H.15(519)" or any successor publication which is published weekly by the Federal Reserve System and which establishes yields on actively traded United States government securities adjusted to constant maturities, or, if such Statistical Release is not published at the time of any determination under the indenture, then such other reasonably comparable index which shall be designated by us. "Stockholders' Equity" means, as of any date of determination, stockholders' equity as of that date determined in accordance with GAAP; provided that there shall be excluded from Stockholders' Equity any amount attributable to capital stock that is, directly or indirectly, required to be redeemed or repurchased by the issuer thereof at a specified date or upon the occurrence of specified events or at the election of the holder thereof.

11. The Depository for the Notes shall be The Depository Trust Company ("DTC"). 12. Each of the undersigned is authorized to approve the form, terms and conditions of the Notes. 13. Attached hereto as Annex C are true and correct copies of the Resolutions. 14. Each of the undersigned has read the provisions of the Indenture, including the covenants and conditions precedent, pertaining to the issuance of the Notes. 15. In connection with this Certificate, each of the undersigned has examined the documents, corporate records and certificates and has made such inquiries of the other officers of the Company, which he has deemed necessary to enable him to express an informed opinion as to whether or not such comments and conditions have been complied with. 16. In the opinion of each of the undersigned, all of the conditions and covenants related to the issuance of the Notes have been complied with.

IN WITNESS WHEREOF, the undersigned have executed this Officers' Certificate as of the date first set forth above. By: /s/ Richard D. Nanula ------------------------------------- Name: Richard D. Nanula Title: Executive Vice President and Chief Financial Officer By: Steven J. Schoch ------------------------------------- Name: Steven J. Schoch Title: Vice President, Finance and Controller

Annex A Form of 4.00% Senior Notes due 2009 [Face of Note] CUSIP/CINS ___________ 4.00% Senior Notes due 2009 No. ___ $____________ AMGEN INC. promises to pay to CEDE & CO. or registered assigns, the principal sum of _____________________ on November 18, 2009. Interest Payment Dates: May 18 and November 18 Record Dates: 15th day prior to May 18 and November 18 Dated: November 18, 2004 AMGEN INC. By: ______________________________ Name: Title: By: ______________________________ Name: Title: This is one of the Notes referred to in the within-mentioned Indenture: JPMorgan Chase Bank, N.A., as Trustee By: ________________________________ Authorized Officer 1

[Back of Note] 4.00% SENIOR NOTES DUE 2009 [GLOBAL LEGEND] THIS SECURITY IS A GLOBAL SECURITY WITHIN THE MEANING OF THE INDENTURE HEREINAFTER REFERRED TO AND IS REGISTERED IN THE NAME OF THE DEPOSITORY OR A NOMINEE OF THE DEPOSITORY. THIS SECURITY IS EXCHANGEABLE FOR SECURITIES REGISTERED IN THE NAME OF A PERSON OTHER THAN THE DEPOSITORY OR ITS NOMINEE ONLY IN THE LIMITED CIRCUMSTANCES DESCRIBED IN THE INDENTURE, AND MAY NOT BE TRANSFERRED EXCEPT AS A WHOLE BY THE DEPOSITORY TO A NOMINEE OF THE DEPOSITORY, BY A NOMINEE OF THE DEPOSITORY TO THE DEPOSITORY OR ANOTHER NOMINEE OF THE DEPOSITORY OR BY THE DEPOSITORY OR ANY SUCH NOMINEE TO A SUCCESSOR DEPOSITORY OR A NOMINEE OF SUCH A SUCCESSOR DEPOSITORY. [TRANSFER RESTRICTED LEGEND] THIS NOTE HAS NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED (THE "SECURITIES ACT"), AND ACCORDINGLY, MAY NOT BE OFFERED OR SOLD WITHIN THE UNITED STATES OR TO, OR FOR THE ACCOUNT OR BENEFIT OF, U.S. PERSONS EXCEPT AS SET FORTH IN THE FOLLOWING SENTENCE. BY ITS ACQUISITION HEREOF, THE HOLDER (I) REPRESENTS THAT (A) IT IS A "QUALIFIED INSTITUTIONAL BUYER" (AS DEFINED IN RULE 144A UNDER THE SECURITIES ACT) OR (B) IT IS AN INSTITUTIONAL "ACCREDITED INVESTOR" (AS DEFINED IN RULE 501(A)(1), (2), (3) OR (7) OF REGULATION D UNDER THE SECURITIES ACT) (AN "INSTITUTIONAL ACCREDITED INVESTOR") OR (C) IT IS NOT A U.S. PERSON AND IS ACQUIRING THIS NOTE IN AN OFFSHORE TRANSACTION (AS DEFINED IN REGULATION S UNDER THE SECURITIES ACT) IN COMPLIANCE WITH REGULATION S UNDER THE SECURITIES ACT, (2) AGREES THAT IT WILL NOT, WITHIN THE TIME PERIOD REFERRED TO IN RULE 144(K) UNDER THE SECURITIES ACT AS IN EFFECT ON THE DATE OF THE TRANSFER OF THIS NOTE, RESELL OR OTHERWISE TRANSFER THIS NOTE EXCEPT (A) TO THE ISSUER OR ANY SUBSIDIARY THEREOF, (B) TO A QUALIFIED INSTITUTIONAL BUYER IN COMPLIANCE WITH RULE 144A UNDER THE SECURITIES ACT, (C) INSIDE THE UNITED STATES TO AN INSTITUTIONAL ACCREDITED INVESTOR THAT, PRIOR TO SUCH TRANSFER, FURNISHES TO THE TRUSTEE A SIGNED LETTER CONTAINING CERTAIN REPRESENTATIONS AND AGREEMENTS RELATING TO THE RESTRICTIONS ON TRANSFER OF THIS NOTE (THE FORM OF WHICH LETTER CAN BE OBTAINED FROM THE TRUSTEE) AND IF SUCH TRANSFER IS IN RESPECT OF AN AGGREGATE PRINCIPAL AMOUNT OF NOTES OF LESS THAN $100,000, AN OPINION OF COUNSEL ACCEPTABLE TO THE ISSUER THAT SUCH TRANSFER IS IN COMPLIANCE WITH THE SECURITIES ACT, (D) OUTSIDE THE UNITED STATES IN AN OFFSHORE TRANSACTION IN COMPLIANCE WITH RULE 904 UNDER THE SECURITIES ACT, (E) PURSUANT TO THE EXEMPTION FROM REGISTRATION PROVIDED UNDER THE SECURITIES ACT (IF AVAILABLE) OR (F) PURSUANT TO AN EFFECTIVE REGISTRATION STATEMENT UNDER THE SECURITIES ACT AND IN EACH CASE IN ACCORDANCE WITH ANY APPLICABLE SECURITIES LAWS OF ANY STATE OF THE UNITED STATES. PRIOR TO ANY TRANSFER, THE HOLDER OF THIS SECURITY AGREES THAT IT WILL DELIVER TO EACH PERSON TO WHOM THIS NOTE IS TRANSFERRED A NOTICE SUBSTANTIALLY TO THE EFFECT OF THIS 2

LEGEND. IN CONNECTION WITH ANY TRANSFER OF THIS NOTE WITHIN THE TIME PERIOD REFERRED TO IN RULE 144(K) UNDER THE SECURITIES ACT AFTER THE ORIGINAL ISSUANCE OF THE NOTES, THE HOLDER MUST CHECK THE APPROPRIATE BOX SET FORTH ON THE REVERSE HEREOF RELATING TO THE MANNER OF SUCH TRANSFER AND SUBMIT THIS CERTIFICATE TO THE TRUSTEE. IF THE PROPOSED TRANSFEREE IS AN INSTITUTIONAL ACCREDITED INVESTOR OR A NON-U.S. PERSON, THE HOLDER MUST, PRIOR TO SUCH TRANSFER, FURNISH TO THE TRUSTEE AND THE COMPANY SUCH CERTIFICATIONS, LEGAL OPINIONS OR OTHER INFORMATION AS EITHER OF THEM MAY REASONABLY REQUIRE TO CONFIRM THAT SUCH TRANSFER IS BEING MADE PURSUANT TO AN EXEMPTION FROM, OR IN A TRANSACTION NOT SUBJECT TO, THE REGISTRATION REQUIREMENTS OF THE SECURITIES ACT. AS USED HEREIN, THE TERMS "OFFSHORE TRANSACTION." "UNITED STATES" AND "U.S. PERSON" HAVE THE MEANINGS GIVEN TO THEM BY REGULATION S UNDER THE SECURITIES ACT. THE INDENTURE CONTAINS A PROVISION REQUIRING THE TRUSTEE TO REFUSE TO REGISTER ANY TRANSFER OF THIS NOTE IN VIOLATION OF THE FOREGOING RESTRICTION. Capitalized terms used herein have the meanings assigned to them in the Indenture referred to below unless otherwise indicated. (1) INTEREST. Amgen Inc., a Delaware corporation (the "Company"), promises to pay interest on the principal amount of this Note at 4.00% per annum from November 18, 2004 until maturity and shall pay the Special Interest (as defined in the Registration Rights Agreement), if any, payable pursuant to Section 4 of the Registration Rights Agreement referred to below. The Company will pay interest and Special Interest, if any, semi-annually in arrears on May 18 and November 18 of each year, or if any such day is not a Business Day, on the next succeeding Business Day (each, an "Interest Payment Date"). Interest on the Notes will accrue from the most recent date to which interest has been paid or, if no interest has been paid, from the date of issuance; provided that the first Interest Payment Date shall be May 18, 2005; provided further that after May 18, 2005, if there is no existing Default in the payment of interest, and if this Note is authenticated between a record date referred to on the face hereof and the next succeeding Interest Payment Date, interest shall accrue from such next succeeding Interest Payment Date. (2) METHOD OF PAYMENT. The Company will pay interest on the Notes (except defaulted interest) and Special Interest, if any, to the Persons who are registered Holders of Notes at the close of business on the day that is 15 days prior to the next succeeding Interest Payment Date (whether or not such day is a Business Day), even if such Notes are canceled after such record date and on or before such Interest Payment Date, except as provided in Section 2.13 of the Indenture with respect to defaulted interest. The Notes will be payable as to principal, interest and Special Interest, if any, at the office or agency of the Company maintained for such purpose in the Borough of Manhattan, the City and State of New York (or, if the Company fails to maintain such office or agency, at the corporate trust office of the trustee in New York, New York or if the trustee does not maintain an office in New York, at the office of a paying agent in New York), or, at the option of the Company, payment of interest and Special Interest, if any, may be made by check mailed to the Holders at their addresses set forth in the register of Holders; provided that payment by wire transfer of immediately available funds will be required with respect to principal of and interest and Special Interest, if any, on, all Global Securities and all other Notes the Holders of which will have provided wire transfer instructions to the Company or the Paying Agent. Such payment will be in the currency of the United States of America. 3

(3) PAYING AGENT AND REGISTRAR. Initially, JPMorgan Chase Bank, N.A., the Trustee under the Indenture, will act as Paying Agent and Registrar. The Company may change any Paying Agent or Registrar without notice to any Holder. The Company or any of its Subsidiaries may act in any such capacity. (4) INDENTURE. The terms of the Notes include those stated in the Indenture and those made part of the Indenture by the Officers' Certificate dated November 18, 2004 delivered pursuant thereto (the "Officers' Certificate") and the TIA. The Notes are subject to all such terms, and the Holders are referred to the Indenture and the TIA for a statement of them. (5) OPTIONAL REDEMPTION. At any time prior to maturity, the Company will have the option to redeem all or a part of the Notes upon not less than 30 nor more than 60 days' notice, at a redemption price equal to the sum of (1) 100% of the principal amount of any notes being redeemed plus accrued and unpaid interest to, but not including, the redemption date, and (2) the Make-Whole Amount. Unless the Company defaults in the payment of the redemption price, interest will cease to accrue on the Notes or portions thereof called for redemption on the applicable redemption date. (6) MANDATORY REDEMPTION. The Company is not required to make mandatory redemption or sinking fund payments with respect to the Notes. (7) NOTICE OF REDEMPTION. Notice of redemption will be mailed at least 30 days but not more than 60 days before the redemption date to each Holder whose Notes are to be redeemed at its registered address, except that redemption notices may be mailed more than 60 days prior to a redemption date if the notice is issued in connection with a defeasance of the Notes or a satisfaction or discharge of the Indenture. Notes in denominations larger than $1,000 may be redeemed in part but only in whole multiples of $1,000, unless all of the Notes held by a Holder are to be redeemed. (8) DEFEASANCE PRIOR TO MATURITY. The Indenture contains provisions for defeasance of (i) the entire indebtedness of the Notes or (ii) certain covenants and Events of Default with respect to the Notes, in each case upon compliance with certain conditions set forth therein. (9) RESTRICTIVE COVENANTS. The Indenture and the Officers' Certificate impose certain limitations on the Company's and its Subsidiaries', including limitations on the Company's and its subsidiaries ability to create or incur certain Liens on any of their respective properties or assets and to enter into certain sale and lease-back transactions and on the Company's ability to engage in mergers or consolidations or the conveyance, transfer or lease of all or substantially all of its properties and assets. These limitations are subject to a number of important qualifications and exceptions and reference is made to the Indenture and the Officers' Certificate for a description thereof. (10) DENOMINATIONS, TRANSFER, EXCHANGE. The Notes are in registered form without coupons in denominations of $1,000 and integral multiples of $1,000. The transfer of Notes may be registered and Notes may be exchanged as provided in the Indenture. The Registrar and the Trustee may require a Holder, among other things, to furnish appropriate endorsements and transfer documents and the Company may require a Holder to pay any taxes and fees required by law or permitted by the Indenture. The Company need not exchange or register the transfer of any Note or portion of a Note selected for redemption, except for the unredeemed portion of any Note being redeemed in part. Also, the Company need not exchange or register the transfer of 4

any Notes for a period of 15 days before a selection of Notes to be redeemed or during the period between a record date and the corresponding Interest Payment Date. (11) PERSONS DEEMED OWNERS. The registered Holder of a Note may be treated as its owner for all purposes. (12) AMENDMENT, SUPPLEMENT AND WAIVER. Subject to certain exceptions, the Indenture or the Notes may be amended or supplemented with the consent of the Holders of at least a majority in aggregate principal amount of the then outstanding Notes voting as a single class, and any existing Default or Event or Default or compliance with any provision of the Indenture or the Notes may be waived with the consent of the Holders of a majority in aggregate principal amount of the then outstanding Notes voting as a single class. Without the consent of any Holder of a Note, the Indenture or the Notes may be amended or supplemented to cure any ambiguity, defect or inconsistency, to provide for uncertificated Notes in addition to or in place of certificated Notes, to make any change that would not adversely affect the legal rights under the Indenture of any such Holder, to provide for the issuance of any additional notes as permitted by the Indenture, to appoint a successor trustee with respect to the notes and to add to or change any of the provisions of the Indenture necessary to provide for the administration of the trusts in the indenture by more than one trustee, or to comply with the requirements of the SEC in order to effect or maintain the qualification of the Indenture under the TIA. (13) DEFAULTS AND REMEDIES. If an Event of Default shall occur and be continuing, the principal of the Notes may be declared (or, in certain cases, shall ipso facto become) due and payable in the manner and with the effect provided in the Indenture. (14) TRUSTEE DEALINGS WITH COMPANY. The Trustee under the Indenture, in its individual or any other capacity, may deal with the Company or an Affiliate of the Company with the same rights it would have if it were not Trustee. (15) NO RECOURSE AGAINST OTHERS. A director, officer, employee or stockholder of the Company shall not have any liability for any obligations of the Company under the Notes or the Indenture or for any claim based on, in respect of, or by reason of, such obligations or their creation. Each Holder by accepting a Note waives and releases all such liability. The waiver and release are part of the consideration for the issuance of the Notes. (16) AUTHENTICATION. This Note will not be valid until authenticated by the manual signature of the Trustee or an authenticating agent. (17) ABBREVIATIONS. Customary abbreviations may be used in the name of a Holder or an assignee, such as: TEN COM (= tenants in common), TEN ENT (= tenants by the entireties), JT TEN (= joint tenants with right of survivorship and not as tenants in common), CUST (= Custodian), and U/G/M/A (= Uniform Gifts to Minors Act). (18) REGISTRATION RIGHTS OF HOLDERS. In addition to the rights provided to Holders of Notes under the Indenture, Holders of restricted Notes will have all the rights set forth in the Registration Rights Agreement, dated as of November 18, 2004, between the Company and the other parties named on the signature pages thereof (the "Registration Rights Agreement"). (19) CUSIP NUMBERS. Pursuant to a recommendation promulgated by the Committee on Uniform Security Identification Procedures, the Company has caused CUSIP numbers to be printed on the Notes, and the Trustee may use CUSIP numbers in notices of redemption as a 5

convenience to Holders. No representation is made as to the accuracy of such numbers either as printed on the Notes or as contained in any notice of redemption, and reliance may be placed only on the other identification numbers placed thereon. (20) GOVERNING LAW. THE INTERNAL LAW OF THE STATE OF NEW YORK WILL GOVERN AND BE USED TO CONSTRUE THE INDENTURE AND THIS NOTE WITHOUT GIVING EFFECT TO APPLICABLE PRINCIPLES OF CONFLICTS OF LAW TO THE EXTENT THAT THE APPLICATION OF THE LAWS OF ANOTHER JURISDICTION WOULD BE REQUIRED THEREBY. The Company will furnish to any Holder upon written request and without charge a copy of the Indenture and/or the Registration Rights Agreement. Requests may be made to: Amgen Inc. One Amgen Center Drive Thousand Oaks, CA 91320-1799 Attention: Investor Relations 6

ASSIGNMENT FORM To assign this Note, fill in the form below: (I) or (we) assign and transfer this Note to: __________________________________ (Insert assignee's legal name) _______________________________________________________________________________ (Insert assignee's soc. sec. or tax I.D. no.) _______________________________________________________________________________ _______________________________________________________________________________ _______________________________________________________________________________ _______________________________________________________________________________ (Print or type assignee's name, address and zip code) and irrevocably appoint ________________________________________________________ to transfer this Note on the books of the Company. The agent may substitute another to act for him. Date: _______________ Your Signature: ___________________________ (Sign exactly as your name appears on the face of this Note) Signature Guarantee*: _________________________ * Participant in a recognized Signature Guarantee Medallion Program (or other signature guarantor acceptable to the Trustee). 7

Annex B Form of 4.85% Senior Notes due 2014 [Face of Note] CUSIP/CINS ___________ 4.85% Senior Notes due 2014 No. ___ $____________ AMGEN INC. promises to pay to CEDE & CO. or registered assigns, the principal sum of _____________________ on November 18, 2014. Interest Payment Dates: May 18 and November 18 Record Dates: 15th day prior to May 18 and November 18 Dated: November 18, 2004 AMGEN INC. By: ----------------------------- Name: Title: By: ----------------------------- Name: Title: This is one of the Notes referred to in the within-mentioned Indenture: JPMorgan Chase Bank, N.A., as Trustee By: ----------------------------- Authorized Officer 1

[Back of Note] 4.85% SENIOR NOTES DUE 2014 [GLOBAL LEGEND] THIS SECURITY IS A GLOBAL SECURITY WITHIN THE MEANING OF THE INDENTURE HEREINAFTER REFERRED TO AND IS REGISTERED IN THE NAME OF THE DEPOSITORY OR A NOMINEE OF THE DEPOSITORY. THIS SECURITY IS EXCHANGEABLE FOR SECURITIES REGISTERED IN THE NAME OF A PERSON OTHER THAN THE DEPOSITORY OR ITS NOMINEE ONLY IN THE LIMITED CIRCUMSTANCES DESCRIBED IN THE INDENTURE, AND MAY NOT BE TRANSFERRED EXCEPT AS A WHOLE BY THE DEPOSITORY TO A NOMINEE OF THE DEPOSITORY, BY A NOMINEE OF THE DEPOSITORY TO THE DEPOSITORY OR ANOTHER NOMINEE OF THE DEPOSITORY OR BY THE DEPOSITORY OR ANY SUCH NOMINEE TO A SUCCESSOR DEPOSITORY OR A NOMINEE OF SUCH A SUCCESSOR DEPOSITORY. [TRANSFER RESTRICTED LEGEND] THIS NOTE HAS NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED (THE "SECURITIES ACT"), AND ACCORDINGLY, MAY NOT BE OFFERED OR SOLD WITHIN THE UNITED STATES OR TO, OR FOR THE ACCOUNT OR BENEFIT OF, U.S. PERSONS EXCEPT AS SET FORTH IN THE FOLLOWING SENTENCE. BY ITS ACQUISITION HEREOF, THE HOLDER (I) REPRESENTS THAT (A) IT IS A "QUALIFIED INSTITUTIONAL BUYER" (AS DEFINED IN RULE 144A UNDER THE SECURITIES ACT) OR (B) IT IS AN INSTITUTIONAL "ACCREDITED INVESTOR" (AS DEFINED IN RULE 501(A)(1), (2), (3) OR (7) OF REGULATION D UNDER THE SECURITIES ACT) (AN "INSTITUTIONAL ACCREDITED INVESTOR") OR (C) IT IS NOT A U.S. PERSON AND IS ACQUIRING THIS NOTE IN AN OFFSHORE TRANSACTION (AS DEFINED IN REGULATION S UNDER THE SECURITIES ACT) IN COMPLIANCE WITH REGULATION S UNDER THE SECURITIES ACT, (2) AGREES THAT IT WILL NOT, WITHIN THE TIME PERIOD REFERRED TO IN RULE 144(K) UNDER THE SECURITIES ACT AS IN EFFECT ON THE DATE OF THE TRANSFER OF THIS NOTE, RESELL OR OTHERWISE TRANSFER THIS NOTE EXCEPT (A) TO THE ISSUER OR ANY SUBSIDIARY THEREOF, (B) TO A QUALIFIED INSTITUTIONAL BUYER IN COMPLIANCE WITH RULE 144A UNDER THE SECURITIES ACT, (C) INSIDE THE UNITED STATES TO AN INSTITUTIONAL ACCREDITED INVESTOR THAT, PRIOR TO SUCH TRANSFER, FURNISHES TO THE TRUSTEE A SIGNED LETTER CONTAINING CERTAIN REPRESENTATIONS AND AGREEMENTS RELATING TO THE RESTRICTIONS ON TRANSFER OF THIS NOTE (THE FORM OF WHICH LETTER CAN BE OBTAINED FROM THE TRUSTEE) AND IF SUCH TRANSFER IS IN RESPECT OF AN AGGREGATE PRINCIPAL AMOUNT OF NOTES OF LESS THAN $100,000, AN OPINION OF COUNSEL ACCEPTABLE TO THE ISSUER THAT SUCH TRANSFER IS IN COMPLIANCE WITH THE SECURITIES ACT, (D) OUTSIDE THE UNITED STATES IN AN OFFSHORE TRANSACTION IN COMPLIANCE WITH RULE 904 UNDER THE SECURITIES ACT, (E) PURSUANT TO THE EXEMPTION FROM REGISTRATION PROVIDED UNDER THE SECURITIES ACT (IF AVAILABLE) OR (F) PURSUANT TO AN EFFECTIVE REGISTRATION STATEMENT UNDER THE SECURITIES ACT AND IN EACH CASE IN ACCORDANCE WITH ANY APPLICABLE SECURITIES LAWS OF ANY STATE OF THE UNITED STATES. PRIOR TO ANY TRANSFER, THE HOLDER OF THIS SECURITY AGREES THAT IT WILL DELIVER TO EACH PERSON TO WHOM THIS NOTE IS TRANSFERRED A NOTICE SUBSTANTIALLY TO THE EFFECT OF THIS 2

LEGEND. IN CONNECTION WITH ANY TRANSFER OF THIS NOTE WITHIN THE TIME PERIOD REFERRED TO IN RULE 144(K) UNDER THE SECURITIES ACT AFTER THE ORIGINAL ISSUANCE OF THE NOTES, THE HOLDER MUST CHECK THE APPROPRIATE BOX SET FORTH ON THE REVERSE HEREOF RELATING TO THE MANNER OF SUCH TRANSFER AND SUBMIT THIS CERTIFICATE TO THE TRUSTEE. IF THE PROPOSED TRANSFEREE IS AN INSTITUTIONAL ACCREDITED INVESTOR OR A NON-U.S. PERSON, THE HOLDER MUST, PRIOR TO SUCH TRANSFER, FURNISH TO THE TRUSTEE AND THE COMPANY SUCH CERTIFICATIONS, LEGAL OPINIONS OR OTHER INFORMATION AS EITHER OF THEM MAY REASONABLY REQUIRE TO CONFIRM THAT SUCH TRANSFER IS BEING MADE PURSUANT TO AN EXEMPTION FROM, OR IN A TRANSACTION NOT SUBJECT TO, THE REGISTRATION REQUIREMENTS OF THE SECURITIES ACT. AS USED HEREIN, THE TERMS "OFFSHORE TRANSACTION." "UNITED STATES" AND "U.S. PERSON" HAVE THE MEANINGS GIVEN TO THEM BY REGULATION S UNDER THE SECURITIES ACT. THE INDENTURE CONTAINS A PROVISION REQUIRING THE TRUSTEE TO REFUSE TO REGISTER ANY TRANSFER OF THIS NOTE IN VIOLATION OF THE FOREGOING RESTRICTION. Capitalized terms used herein have the meanings assigned to them in the Indenture referred to below unless otherwise indicated. (1) INTEREST. Amgen Inc., a Delaware corporation (the "Company"), promises to pay interest on the principal amount of this Note at 4.85% per annum from November 18, 2004 until maturity and shall pay the Special Interest (as defined in the Registration Rights Agreement), if any, payable pursuant to Section 4 of the Registration Rights Agreement referred to below. The Company will pay interest and Special Interest, if any, semi-annually in arrears on May 18 and November 18 of each year, or if any such day is not a Business Day, on the next succeeding Business Day (each, an "Interest Payment Date"). Interest on the Notes will accrue from the most recent date to which interest has been paid or, if no interest has been paid, from the date of issuance; provided that the first Interest Payment Date shall be May 18, 2005; provided further that after May 18, 2005, if there is no existing Default in the payment of interest, and if this Note is authenticated between a record date referred to on the face hereof and the next succeeding Interest Payment Date, interest shall accrue from such next succeeding Interest Payment Date. (2) METHOD OF PAYMENT. The Company will pay interest on the Notes (except defaulted interest) and Special Interest, if any, to the Persons who are registered Holders of Notes at the close of business on the day that is 15 days prior to the next succeeding Interest Payment Date (whether or not such day is a Business Day), even if such Notes are canceled after such record date and on or before such Interest Payment Date, except as provided in Section 2.13 of the Indenture with respect to defaulted interest. The Notes will be payable as to principal, interest and Special Interest, if any, at the office or agency of the Company maintained for such purpose in the Borough of Manhattan, the City and State of New York (or, if the Company fails to maintain such office or agency, at the corporate trust office of the trustee in New York, New York or if the trustee does not maintain an office in New York, at the office of a paying agent in New York), or, at the option of the Company, payment of interest and Special Interest, if any, may be made by check mailed to the Holders at their addresses set forth in the register of Holders; provided that payment by wire transfer of immediately available funds will be required with respect to principal of and interest and Special Interest, if any, on, all Global Securities and all other Notes the Holders of which will have provided wire transfer instructions to the Company or the Paying Agent. Such payment will be in the currency of the United States of America. 3

(3) PAYING AGENT AND REGISTRAR. Initially, JPMorgan Chase Bank, N.A., the Trustee under the Indenture, will act as Paying Agent and Registrar. The Company may change any Paying Agent or Registrar without notice to any Holder. The Company or any of its Subsidiaries may act in any such capacity. (4) INDENTURE. The terms of the Notes include those stated in the Indenture and those made part of the Indenture by the Officers' Certificate dated November 18, 2004 delivered pursuant thereto (the "Officers' Certificate") and the TIA. The Notes are subject to all such terms, and the Holders are referred to the Indenture and the TIA for a statement of them. (5) OPTIONAL REDEMPTION. At any time prior to maturity, the Company will have the option to redeem all or a part of the Notes upon not less than 30 nor more than 60 days' notice, at a redemption price equal to the sum of (1) 100% of the principal amount of any notes being redeemed plus accrued and unpaid interest to, but not including, the redemption date, and (2) the Make-Whole Amount. Unless the Company defaults in the payment of the redemption price, interest will cease to accrue on the Notes or portions thereof called for redemption on the applicable redemption date. (6) MANDATORY REDEMPTION. The Company is not required to make mandatory redemption or sinking fund payments with respect to the Notes. (7) NOTICE OF REDEMPTION. Notice of redemption will be mailed at least 30 days but not more than 60 days before the redemption date to each Holder whose Notes are to be redeemed at its registered address, except that redemption notices may be mailed more than 60 days prior to a redemption date if the notice is issued in connection with a defeasance of the Notes or a satisfaction or discharge of the Indenture. Notes in denominations larger than $1,000 may be redeemed in part but only in whole multiples of $1,000, unless all of the Notes held by a Holder are to be redeemed. (8) DEFEASANCE PRIOR TO MATURITY. The Indenture contains provisions for defeasance of (i) the entire indebtedness of the Notes or (ii) certain covenants and Events of Default with respect to the Notes, in each case upon compliance with certain conditions set forth therein. (9) RESTRICTIVE COVENANTS. The Indenture and the Officers' Certificate impose certain limitations on the Company's and its Subsidiaries', including limitations on the Company's and its subsidiaries ability to create or incur certain Liens on any of their respective properties or assets and to enter into certain sale and lease-back transactions and on the Company's ability to engage in mergers or consolidations or the conveyance, transfer or lease of all or substantially all of its properties and assets. These limitations are subject to a number of important qualifications and exceptions and reference is made to the Indenture and the Officers' Certificate for a description thereof. (10) DENOMINATIONS, TRANSFER, EXCHANGE. The Notes are in registered form without coupons in denominations of $1,000 and integral multiples of $1,000. The transfer of Notes may be registered and Notes may be exchanged as provided in the Indenture. The Registrar and the Trustee may require a Holder, among other things, to furnish appropriate endorsements and transfer documents and the Company may require a Holder to pay any taxes and fees required by law or permitted by the Indenture. The Company need not exchange or register the transfer of any Note or portion of a Note selected for redemption, except for the unredeemed portion of any Note being redeemed in part. Also, the Company need not exchange or register the transfer of 4

any Notes for a period of 15 days before a selection of Notes to be redeemed or during the period between a record date and the corresponding Interest Payment Date. (11) PERSONS DEEMED OWNERS. The registered Holder of a Note may be treated as its owner for all purposes. (12) AMENDMENT, SUPPLEMENT AND WAIVER. Subject to certain exceptions, the Indenture or the Notes may be amended or supplemented with the consent of the Holders of at least a majority in aggregate principal amount of the then outstanding Notes voting as a single class, and any existing Default or Event or Default or compliance with any provision of the Indenture or the Notes may be waived with the consent of the Holders of a majority in aggregate principal amount of the then outstanding Notes voting as a single class. Without the consent of any Holder of a Note, the Indenture or the Notes may be amended or supplemented to cure any ambiguity, defect or inconsistency, to provide for uncertificated Notes in addition to or in place of certificated Notes, to make any change that would not adversely affect the legal rights under the Indenture of any such Holder, to provide for the issuance of any additional notes as permitted by the Indenture, to appoint a successor trustee with respect to the notes and to add to or change any of the provisions of the Indenture necessary to provide for the administration of the trusts in the indenture by more than one trustee, or to comply with the requirements of the SEC in order to effect or maintain the qualification of the Indenture under the TIA. (13) DEFAULTS AND REMEDIES. If an Event of Default shall occur and be continuing, the principal of the Notes may be declared (or, in certain cases, shall ipso facto become) due and payable in the manner and with the effect provided in the Indenture. (14) TRUSTEE DEALINGS WITH COMPANY. The Trustee under the Indenture, in its individual or any other capacity, may deal with the Company or an Affiliate of the Company with the same rights it would have if it were not Trustee. (15) NO RECOURSE AGAINST OTHERS. A director, officer, employee or stockholder of the Company shall not have any liability for any obligations of the Company under the Notes or the Indenture or for any claim based on, in respect of, or by reason of, such obligations or their creation. Each Holder by accepting a Note waives and releases all such liability. The waiver and release are part of the consideration for the issuance of the Notes. (16) AUTHENTICATION. This Note will not be valid until authenticated by the manual signature of the Trustee or an authenticating agent. (17) ABBREVIATIONS. Customary abbreviations may be used in the name of a Holder or an assignee, such as: TEN COM (= tenants in common), TEN ENT (= tenants by the entireties), JT TEN (= joint tenants with right of survivorship and not as tenants in common), CUST (= Custodian), and U/G/M/A (= Uniform Gifts to Minors Act). (18) REGISTRATION RIGHTS OF HOLDERS. In addition to the rights provided to Holders of Notes under the Indenture, Holders of restricted Notes will have all the rights set forth in the Registration Rights Agreement, dated as of November 18, 2004, between the Company and the other parties named on the signature pages thereof (the "Registration Rights Agreement"). (19) CUSIP NUMBERS. Pursuant to a recommendation promulgated by the Committee on Uniform Security Identification Procedures, the Company has caused CUSIP numbers to be printed on the Notes, and the Trustee may use CUSIP numbers in notices of redemption as a 5

convenience to Holders. No representation is made as to the accuracy of such numbers either as printed on the Notes or as contained in any notice of redemption, and reliance may be placed only on the other identification numbers placed thereon. (20) GOVERNING LAW. THE INTERNAL LAW OF THE STATE OF NEW YORK WILL GOVERN AND BE USED TO CONSTRUE THE INDENTURE AND THIS NOTE WITHOUT GIVING EFFECT TO APPLICABLE PRINCIPLES OF CONFLICTS OF LAW TO THE EXTENT THAT THE APPLICATION OF THE LAWS OF ANOTHER JURISDICTION WOULD BE REQUIRED THEREBY. The Company will furnish to any Holder upon written request and without charge a copy of the Indenture and/or the Registration Rights Agreement. Requests may be made to: Amgen Inc. One Amgen Center Drive Thousand Oaks, CA 91320-1799 Attention: Investor Relations 6

ASSIGNMENT FORM To assign this Note, fill in the form below: (I) or (we) assign and transfer this Note to: _________________________________ (Insert assignee's legal name) _______________________________________________________________________________ (Insert assignee's soc. sec. or tax I.D. no.) _______________________________________________________________________________ _______________________________________________________________________________ _______________________________________________________________________________ _______________________________________________________________________________ (Print or type assignee's name, address and zip code) and irrevocably appoint ________________________________________________________ to transfer this Note on the books of the Company. The agent may substitute another to act for him. Date: _______________ Your Signature: ________________________________ (Sign exactly as your name appears on the face of this Note) Signature Guarantee*: _________________________ * Participant in a recognized Signature Guarantee Medallion Program (or other signature guarantor acceptable to the Trustee). 7

EXHIBIT 4.3 [Face of Note] CUSIP/CINS ___________ 4.00% Senior Notes due 2009 No. ___ $____________ AMGEN INC. promises to pay to CEDE & CO. or registered assigns, the principal sum of _____________________ on November 18, 2009. Interest Payment Dates: May 18 and November 18 Record Dates: 15th day prior to May 18 and November 18 Dated: November 18, 2004 AMGEN INC. By: ______________________________ Name: Title: By: ______________________________ Name: Title: This is one of the Notes referred to in the within-mentioned Indenture: JPMorgan Chase Bank, N.A., as Trustee By: ________________________________ Authorized Officer 1

[Back of Note] 4.00% SENIOR NOTES DUE 2009 [GLOBAL LEGEND] THIS SECURITY IS A GLOBAL SECURITY WITHIN THE MEANING OF THE INDENTURE HEREINAFTER REFERRED TO AND IS REGISTERED IN THE NAME OF THE DEPOSITORY OR A NOMINEE OF THE DEPOSITORY. THIS SECURITY IS EXCHANGEABLE FOR SECURITIES REGISTERED IN THE NAME OF A PERSON OTHER THAN THE DEPOSITORY OR ITS NOMINEE ONLY IN THE LIMITED CIRCUMSTANCES DESCRIBED IN THE INDENTURE, AND MAY NOT BE TRANSFERRED EXCEPT AS A WHOLE BY THE DEPOSITORY TO A NOMINEE OF THE DEPOSITORY, BY A NOMINEE OF THE DEPOSITORY TO THE DEPOSITORY OR ANOTHER NOMINEE OF THE DEPOSITORY OR BY THE DEPOSITORY OR ANY SUCH NOMINEE TO A SUCCESSOR DEPOSITORY OR A NOMINEE OF SUCH A SUCCESSOR DEPOSITORY. [TRANSFER RESTRICTED LEGEND] THIS NOTE HAS NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED (THE "SECURITIES ACT"), AND ACCORDINGLY, MAY NOT BE OFFERED OR SOLD WITHIN THE UNITED STATES OR TO, OR FOR THE ACCOUNT OR BENEFIT OF, U.S. PERSONS EXCEPT AS SET FORTH IN THE FOLLOWING SENTENCE. BY ITS ACQUISITION HEREOF, THE HOLDER (I) REPRESENTS THAT (A) IT IS A "QUALIFIED INSTITUTIONAL BUYER" (AS DEFINED IN RULE 144A UNDER THE SECURITIES ACT) OR (B) IT IS AN INSTITUTIONAL "ACCREDITED INVESTOR" (AS DEFINED IN RULE 501(A)(1), (2), (3) OR (7) OF REGULATION D UNDER THE SECURITIES ACT) (AN "INSTITUTIONAL ACCREDITED INVESTOR") OR (C) IT IS NOT A U.S. PERSON AND IS ACQUIRING THIS NOTE IN AN OFFSHORE TRANSACTION (AS DEFINED IN REGULATION S UNDER THE SECURITIES ACT) IN COMPLIANCE WITH REGULATION S UNDER THE SECURITIES ACT, (2) AGREES THAT IT WILL NOT, WITHIN THE TIME PERIOD REFERRED TO IN RULE 144(K) UNDER THE SECURITIES ACT AS IN EFFECT ON THE DATE OF THE TRANSFER OF THIS NOTE, RESELL OR OTHERWISE TRANSFER THIS NOTE EXCEPT (A) TO THE ISSUER OR ANY SUBSIDIARY THEREOF, (B) TO A QUALIFIED INSTITUTIONAL BUYER IN COMPLIANCE WITH RULE 144A UNDER THE SECURITIES ACT, (C) INSIDE THE UNITED STATES TO AN INSTITUTIONAL ACCREDITED INVESTOR THAT, PRIOR TO SUCH TRANSFER, FURNISHES TO THE TRUSTEE A SIGNED LETTER CONTAINING CERTAIN REPRESENTATIONS AND AGREEMENTS RELATING TO THE RESTRICTIONS ON TRANSFER OF THIS NOTE (THE FORM OF WHICH LETTER CAN BE OBTAINED FROM THE TRUSTEE) AND IF SUCH TRANSFER IS IN RESPECT OF AN AGGREGATE PRINCIPAL AMOUNT OF NOTES OF LESS THAN $100,000, AN OPINION OF COUNSEL ACCEPTABLE TO THE ISSUER THAT SUCH TRANSFER IS IN COMPLIANCE WITH THE SECURITIES ACT, (D) OUTSIDE THE UNITED STATES IN AN OFFSHORE TRANSACTION IN COMPLIANCE WITH RULE 904 UNDER THE SECURITIES ACT, (E) PURSUANT TO THE EXEMPTION FROM REGISTRATION PROVIDED UNDER THE SECURITIES ACT (IF AVAILABLE) OR (F) PURSUANT TO AN EFFECTIVE REGISTRATION STATEMENT UNDER THE SECURITIES ACT AND IN EACH CASE IN ACCORDANCE WITH ANY APPLICABLE SECURITIES LAWS OF ANY STATE OF THE UNITED STATES. PRIOR TO ANY TRANSFER, THE HOLDER OF THIS SECURITY AGREES THAT IT WILL DELIVER TO EACH PERSON TO WHOM THIS NOTE IS TRANSFERRED A NOTICE SUBSTANTIALLY TO THE EFFECT OF THIS 2

LEGEND. IN CONNECTION WITH ANY TRANSFER OF THIS NOTE WITHIN THE TIME PERIOD REFERRED TO IN RULE 144(K) UNDER THE SECURITIES ACT AFTER THE ORIGINAL ISSUANCE OF THE NOTES, THE HOLDER MUST CHECK THE APPROPRIATE BOX SET FORTH ON THE REVERSE HEREOF RELATING TO THE MANNER OF SUCH TRANSFER AND SUBMIT THIS CERTIFICATE TO THE TRUSTEE. IF THE PROPOSED TRANSFEREE IS AN INSTITUTIONAL ACCREDITED INVESTOR OR A NON-U.S. PERSON, THE HOLDER MUST, PRIOR TO SUCH TRANSFER, FURNISH TO THE TRUSTEE AND THE COMPANY SUCH CERTIFICATIONS, LEGAL OPINIONS OR OTHER INFORMATION AS EITHER OF THEM MAY REASONABLY REQUIRE TO CONFIRM THAT SUCH TRANSFER IS BEING MADE PURSUANT TO AN EXEMPTION FROM, OR IN A TRANSACTION NOT SUBJECT TO, THE REGISTRATION REQUIREMENTS OF THE SECURITIES ACT. AS USED HEREIN, THE TERMS "OFFSHORE TRANSACTION." "UNITED STATES" AND "U.S. PERSON" HAVE THE MEANINGS GIVEN TO THEM BY REGULATION S UNDER THE SECURITIES ACT. THE INDENTURE CONTAINS A PROVISION REQUIRING THE TRUSTEE TO REFUSE TO REGISTER ANY TRANSFER OF THIS NOTE IN VIOLATION OF THE FOREGOING RESTRICTION. Capitalized terms used herein have the meanings assigned to them in the Indenture referred to below unless otherwise indicated. (1) INTEREST. Amgen Inc., a Delaware corporation (the "Company"), promises to pay interest on the principal amount of this Note at 4.00% per annum from November 18, 2004 until maturity and shall pay the Special Interest (as defined in the Registration Rights Agreement), if any, payable pursuant to Section 4 of the Registration Rights Agreement referred to below. The Company will pay interest and Special Interest, if any, semi-annually in arrears on May 18 and November 18 of each year, or if any such day is not a Business Day, on the next succeeding Business Day (each, an "Interest Payment Date"). Interest on the Notes will accrue from the most recent date to which interest has been paid or, if no interest has been paid, from the date of issuance; provided that the first Interest Payment Date shall be May 18, 2005; provided further that after May 18, 2005, if there is no existing Default in the payment of interest, and if this Note is authenticated between a record date referred to on the face hereof and the next succeeding Interest Payment Date, interest shall accrue from such next succeeding Interest Payment Date. (2) METHOD OF PAYMENT. The Company will pay interest on the Notes (except defaulted interest) and Special Interest, if any, to the Persons who are registered Holders of Notes at the close of business on the day that is 15 days prior to the next succeeding Interest Payment Date (whether or not such day is a Business Day), even if such Notes are canceled after such record date and on or before such Interest Payment Date, except as provided in Section 2.13 of the Indenture with respect to defaulted interest. The Notes will be payable as to principal, interest and Special Interest, if any, at the office or agency of the Company maintained for such purpose in the Borough of Manhattan, the City and State of New York (or, if the Company fails to maintain such office or agency, at the corporate trust office of the trustee in New York, New York or if the trustee does not maintain an office in New York, at the office of a paying agent in New York), or, at the option of the Company, payment of interest and Special Interest, if any, may be made by check mailed to the Holders at their addresses set forth in the register of Holders; provided that payment by wire transfer of immediately available funds will be required with respect to principal of and interest and Special Interest, if any, on, all Global Securities and all other Notes the Holders of which will have provided wire transfer instructions to the Company or the Paying Agent. Such payment will be in the currency of the United States of America. 3

(3) PAYING AGENT AND REGISTRAR. Initially, JPMorgan Chase Bank, N.A., the Trustee under the Indenture, will act as Paying Agent and Registrar. The Company may change any Paying Agent or Registrar without notice to any Holder. The Company or any of its Subsidiaries may act in any such capacity. (4) INDENTURE. The terms of the Notes include those stated in the Indenture and those made part of the Indenture by the Officers' Certificate dated November 18, 2004 delivered pursuant thereto (the "Officers' Certificate") and the TIA. The Notes are subject to all such terms, and the Holders are referred to the Indenture and the TIA for a statement of them. (5) OPTIONAL REDEMPTION. At any time prior to maturity, the Company will have the option to redeem all or a part of the Notes upon not less than 30 nor more than 60 days' notice, at a redemption price equal to the sum of (1) 100% of the principal amount of any notes being redeemed plus accrued and unpaid interest to, but not including, the redemption date, and (2) the Make-Whole Amount. Unless the Company defaults in the payment of the redemption price, interest will cease to accrue on the Notes or portions thereof called for redemption on the applicable redemption date. (6) MANDATORY REDEMPTION. The Company is not required to make mandatory redemption or sinking fund payments with respect to the Notes. (7) NOTICE OF REDEMPTION. Notice of redemption will be mailed at least 30 days but not more than 60 days before the redemption date to each Holder whose Notes are to be redeemed at its registered address, except that redemption notices may be mailed more than 60 days prior to a redemption date if the notice is issued in connection with a defeasance of the Notes or a satisfaction or discharge of the Indenture. Notes in denominations larger than $1,000 may be redeemed in part but only in whole multiples of $1,000, unless all of the Notes held by a Holder are to be redeemed. (8) DEFEASANCE PRIOR TO MATURITY. The Indenture contains provisions for defeasance of (i) the entire indebtedness of the Notes or (ii) certain covenants and Events of Default with respect to the Notes, in each case upon compliance with certain conditions set forth therein. (9) RESTRICTIVE COVENANTS. The Indenture and the Officers' Certificate impose certain limitations on the Company's and its Subsidiaries', including limitations on the Company's and its subsidiaries ability to create or incur certain Liens on any of their respective properties or assets and to enter into certain sale and lease-back transactions and on the Company's ability to engage in mergers or consolidations or the conveyance, transfer or lease of all or substantially all of its properties and assets. These limitations are subject to a number of important qualifications and exceptions and reference is made to the Indenture and the Officers' Certificate for a description thereof. (10) DENOMINATIONS, TRANSFER, EXCHANGE. The Notes are in registered form without coupons in denominations of $1,000 and integral multiples of $1,000. The transfer of Notes may be registered and Notes may be exchanged as provided in the Indenture. The Registrar and the Trustee may require a Holder, among other things, to furnish appropriate endorsements and transfer documents and the Company may require a Holder to pay any taxes and fees required by law or permitted by the Indenture. The Company need not exchange or register the transfer of any Note or portion of a Note selected for redemption, except for the unredeemed portion of any Note being redeemed in part. Also, the Company need not exchange or register the transfer of 4

any Notes for a period of 15 days before a selection of Notes to be redeemed or during the period between a record date and the corresponding Interest Payment Date. (11) PERSONS DEEMED OWNERS. The registered Holder of a Note may be treated as its owner for all purposes. (12) AMENDMENT, SUPPLEMENT AND WAIVER. Subject to certain exceptions, the Indenture or the Notes may be amended or supplemented with the consent of the Holders of at least a majority in aggregate principal amount of the then outstanding Notes voting as a single class, and any existing Default or Event or Default or compliance with any provision of the Indenture or the Notes may be waived with the consent of the Holders of a majority in aggregate principal amount of the then outstanding Notes voting as a single class. Without the consent of any Holder of a Note, the Indenture or the Notes may be amended or supplemented to cure any ambiguity, defect or inconsistency, to provide for uncertificated Notes in addition to or in place of certificated Notes, to make any change that would not adversely affect the legal rights under the Indenture of any such Holder, to provide for the issuance of any additional notes as permitted by the Indenture, to appoint a successor trustee with respect to the notes and to add to or change any of the provisions of the Indenture necessary to provide for the administration of the trusts in the indenture by more than one trustee, or to comply with the requirements of the SEC in order to effect or maintain the qualification of the Indenture under the TIA. (13) DEFAULTS AND REMEDIES. If an Event of Default shall occur and be continuing, the principal of the Notes may be declared (or, in certain cases, shall ipso facto become) due and payable in the manner and with the effect provided in the Indenture. (14) TRUSTEE DEALINGS WITH COMPANY. The Trustee under the Indenture, in its individual or any other capacity, may deal with the Company or an Affiliate of the Company with the same rights it would have if it were not Trustee. (15) NO RECOURSE AGAINST OTHERS. A director, officer, employee or stockholder of the Company shall not have any liability for any obligations of the Company under the Notes or the Indenture or for any claim based on, in respect of, or by reason of, such obligations or their creation. Each Holder by accepting a Note waives and releases all such liability. The waiver and release are part of the consideration for the issuance of the Notes. (16) AUTHENTICATION. This Note will not be valid until authenticated by the manual signature of the Trustee or an authenticating agent. (17) ABBREVIATIONS. Customary abbreviations may be used in the name of a Holder or an assignee, such as: TEN COM (= tenants in common), TEN ENT (= tenants by the entireties), JT TEN (= joint tenants with right of survivorship and not as tenants in common), CUST (= Custodian), and U/G/M/A (= Uniform Gifts to Minors Act). (18) REGISTRATION RIGHTS OF HOLDERS. In addition to the rights provided to Holders of Notes under the Indenture, Holders of restricted Notes will have all the rights set forth in the Registration Rights Agreement, dated as of November 18, 2004, between the Company and the other parties named on the signature pages thereof (the "Registration Rights Agreement"). (19) CUSIP NUMBERS. Pursuant to a recommendation promulgated by the Committee on Uniform Security Identification Procedures, the Company has caused CUSIP numbers to be printed on the Notes, and the Trustee may use CUSIP numbers in notices of redemption as a 5

convenience to Holders. No representation is made as to the accuracy of such numbers either as printed on the Notes or as contained in any notice of redemption, and reliance may be placed only on the other identification numbers placed thereon. (20) GOVERNING LAW. THE INTERNAL LAW OF THE STATE OF NEW YORK WILL GOVERN AND BE USED TO CONSTRUE THE INDENTURE AND THIS NOTE WITHOUT GIVING EFFECT TO APPLICABLE PRINCIPLES OF CONFLICTS OF LAW TO THE EXTENT THAT THE APPLICATION OF THE LAWS OF ANOTHER JURISDICTION WOULD BE REQUIRED THEREBY. The Company will furnish to any Holder upon written request and without charge a copy of the Indenture and/or the Registration Rights Agreement. Requests may be made to: Amgen Inc. One Amgen Center Drive Thousand Oaks, CA 91320-1799 Attention: Investor Relations 6

ASSIGNMENT FORM To assign this Note, fill in the form below: (I) or (we) assign and transfer this Note to: __________________________________ (Insert assignee's legal name) _______________________________________________________________________________ (Insert assignee's soc. sec. or tax I.D. no.) _______________________________________________________________________________ _______________________________________________________________________________ _______________________________________________________________________________ _______________________________________________________________________________ (Print or type assignee's name, address and zip code) and irrevocably appoint ________________________________________________________ to transfer this Note on the books of the Company. The agent may substitute another to act for him. Date: _______________ Your Signature: ___________________________ (Sign exactly as your name appears on the face of this Note) Signature Guarantee*: _________________________ * Participant in a recognized Signature Guarantee Medallion Program (or other signature guarantor acceptable to the Trustee). 7

EXHIBIT 4.4 [Face of Note] CUSIP/CINS ___________ 4.85% Senior Notes due 2014 No. ___ $____________ AMGEN INC. promises to pay to CEDE & CO. or registered assigns, the principal sum of _____________________ on November 18, 2014. Interest Payment Dates: May 18 and November 18 Record Dates: 15th day prior to May 18 and November 18 Dated: November 18, 2004 AMGEN INC. By: ----------------------------- Name: Title: By: ----------------------------- Name: Title: This is one of the Notes referred to in the within-mentioned Indenture: JPMorgan Chase Bank, N.A., as Trustee By: ----------------------------- Authorized Officer 1

[Back of Note] 4.85% SENIOR NOTES DUE 2014 [GLOBAL LEGEND] THIS SECURITY IS A GLOBAL SECURITY WITHIN THE MEANING OF THE INDENTURE HEREINAFTER REFERRED TO AND IS REGISTERED IN THE NAME OF THE DEPOSITORY OR A NOMINEE OF THE DEPOSITORY. THIS SECURITY IS EXCHANGEABLE FOR SECURITIES REGISTERED IN THE NAME OF A PERSON OTHER THAN THE DEPOSITORY OR ITS NOMINEE ONLY IN THE LIMITED CIRCUMSTANCES DESCRIBED IN THE INDENTURE, AND MAY NOT BE TRANSFERRED EXCEPT AS A WHOLE BY THE DEPOSITORY TO A NOMINEE OF THE DEPOSITORY, BY A NOMINEE OF THE DEPOSITORY TO THE DEPOSITORY OR ANOTHER NOMINEE OF THE DEPOSITORY OR BY THE DEPOSITORY OR ANY SUCH NOMINEE TO A SUCCESSOR DEPOSITORY OR A NOMINEE OF SUCH A SUCCESSOR DEPOSITORY. [TRANSFER RESTRICTED LEGEND] THIS NOTE HAS NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED (THE "SECURITIES ACT"), AND ACCORDINGLY, MAY NOT BE OFFERED OR SOLD WITHIN THE UNITED STATES OR TO, OR FOR THE ACCOUNT OR BENEFIT OF, U.S. PERSONS EXCEPT AS SET FORTH IN THE FOLLOWING SENTENCE. BY ITS ACQUISITION HEREOF, THE HOLDER (I) REPRESENTS THAT (A) IT IS A "QUALIFIED INSTITUTIONAL BUYER" (AS DEFINED IN RULE 144A UNDER THE SECURITIES ACT) OR (B) IT IS AN INSTITUTIONAL "ACCREDITED INVESTOR" (AS DEFINED IN RULE 501(A)(1), (2), (3) OR (7) OF REGULATION D UNDER THE SECURITIES ACT) (AN "INSTITUTIONAL ACCREDITED INVESTOR") OR (C) IT IS NOT A U.S. PERSON AND IS ACQUIRING THIS NOTE IN AN OFFSHORE TRANSACTION (AS DEFINED IN REGULATION S UNDER THE SECURITIES ACT) IN COMPLIANCE WITH REGULATION S UNDER THE SECURITIES ACT, (2) AGREES THAT IT WILL NOT, WITHIN THE TIME PERIOD REFERRED TO IN RULE 144(K) UNDER THE SECURITIES ACT AS IN EFFECT ON THE DATE OF THE TRANSFER OF THIS NOTE, RESELL OR OTHERWISE TRANSFER THIS NOTE EXCEPT (A) TO THE ISSUER OR ANY SUBSIDIARY THEREOF, (B) TO A QUALIFIED INSTITUTIONAL BUYER IN COMPLIANCE WITH RULE 144A UNDER THE SECURITIES ACT, (C) INSIDE THE UNITED STATES TO AN INSTITUTIONAL ACCREDITED INVESTOR THAT, PRIOR TO SUCH TRANSFER, FURNISHES TO THE TRUSTEE A SIGNED LETTER CONTAINING CERTAIN REPRESENTATIONS AND AGREEMENTS RELATING TO THE RESTRICTIONS ON TRANSFER OF THIS NOTE (THE FORM OF WHICH LETTER CAN BE OBTAINED FROM THE TRUSTEE) AND IF SUCH TRANSFER IS IN RESPECT OF AN AGGREGATE PRINCIPAL AMOUNT OF NOTES OF LESS THAN $100,000, AN OPINION OF COUNSEL ACCEPTABLE TO THE ISSUER THAT SUCH TRANSFER IS IN COMPLIANCE WITH THE SECURITIES ACT, (D) OUTSIDE THE UNITED STATES IN AN OFFSHORE TRANSACTION IN COMPLIANCE WITH RULE 904 UNDER THE SECURITIES ACT, (E) PURSUANT TO THE EXEMPTION FROM REGISTRATION PROVIDED UNDER THE SECURITIES ACT (IF AVAILABLE) OR (F) PURSUANT TO AN EFFECTIVE REGISTRATION STATEMENT UNDER THE SECURITIES ACT AND IN EACH CASE IN ACCORDANCE WITH ANY APPLICABLE SECURITIES LAWS OF ANY STATE OF THE UNITED STATES. PRIOR TO ANY TRANSFER, THE HOLDER OF THIS SECURITY AGREES THAT IT WILL DELIVER TO EACH PERSON TO WHOM THIS NOTE IS TRANSFERRED A NOTICE SUBSTANTIALLY TO THE EFFECT OF THIS 2

LEGEND. IN CONNECTION WITH ANY TRANSFER OF THIS NOTE WITHIN THE TIME PERIOD REFERRED TO IN RULE 144(K) UNDER THE SECURITIES ACT AFTER THE ORIGINAL ISSUANCE OF THE NOTES, THE HOLDER MUST CHECK THE APPROPRIATE BOX SET FORTH ON THE REVERSE HEREOF RELATING TO THE MANNER OF SUCH TRANSFER AND SUBMIT THIS CERTIFICATE TO THE TRUSTEE. IF THE PROPOSED TRANSFEREE IS AN INSTITUTIONAL ACCREDITED INVESTOR OR A NON-U.S. PERSON, THE HOLDER MUST, PRIOR TO SUCH TRANSFER, FURNISH TO THE TRUSTEE AND THE COMPANY SUCH CERTIFICATIONS, LEGAL OPINIONS OR OTHER INFORMATION AS EITHER OF THEM MAY REASONABLY REQUIRE TO CONFIRM THAT SUCH TRANSFER IS BEING MADE PURSUANT TO AN EXEMPTION FROM, OR IN A TRANSACTION NOT SUBJECT TO, THE REGISTRATION REQUIREMENTS OF THE SECURITIES ACT. AS USED HEREIN, THE TERMS "OFFSHORE TRANSACTION." "UNITED STATES" AND "U.S. PERSON" HAVE THE MEANINGS GIVEN TO THEM BY REGULATION S UNDER THE SECURITIES ACT. THE INDENTURE CONTAINS A PROVISION REQUIRING THE TRUSTEE TO REFUSE TO REGISTER ANY TRANSFER OF THIS NOTE IN VIOLATION OF THE FOREGOING RESTRICTION. Capitalized terms used herein have the meanings assigned to them in the Indenture referred to below unless otherwise indicated. (1) INTEREST. Amgen Inc., a Delaware corporation (the "Company"), promises to pay interest on the principal amount of this Note at 4.85% per annum from November 18, 2004 until maturity and shall pay the Special Interest (as defined in the Registration Rights Agreement), if any, payable pursuant to Section 4 of the Registration Rights Agreement referred to below. The Company will pay interest and Special Interest, if any, semi-annually in arrears on May 18 and November 18 of each year, or if any such day is not a Business Day, on the next succeeding Business Day (each, an "Interest Payment Date"). Interest on the Notes will accrue from the most recent date to which interest has been paid or, if no interest has been paid, from the date of issuance; provided that the first Interest Payment Date shall be May 18, 2005; provided further that after May 18, 2005, if there is no existing Default in the payment of interest, and if this Note is authenticated between a record date referred to on the face hereof and the next succeeding Interest Payment Date, interest shall accrue from such next succeeding Interest Payment Date. (2) METHOD OF PAYMENT. The Company will pay interest on the Notes (except defaulted interest) and Special Interest, if any, to the Persons who are registered Holders of Notes at the close of business on the day that is 15 days prior to the next succeeding Interest Payment Date (whether or not such day is a Business Day), even if such Notes are canceled after such record date and on or before such Interest Payment Date, except as provided in Section 2.13 of the Indenture with respect to defaulted interest. The Notes will be payable as to principal, interest and Special Interest, if any, at the office or agency of the Company maintained for such purpose in the Borough of Manhattan, the City and State of New York (or, if the Company fails to maintain such office or agency, at the corporate trust office of the trustee in New York, New York or if the trustee does not maintain an office in New York, at the office of a paying agent in New York), or, at the option of the Company, payment of interest and Special Interest, if any, may be made by check mailed to the Holders at their addresses set forth in the register of Holders; provided that payment by wire transfer of immediately available funds will be required with respect to principal of and interest and Special Interest, if any, on, all Global Securities and all other Notes the Holders of which will have provided wire transfer instructions to the Company or the Paying Agent. Such payment will be in the currency of the United States of America. 3

(3) PAYING AGENT AND REGISTRAR. Initially, JPMorgan Chase Bank, N.A., the Trustee under the Indenture, will act as Paying Agent and Registrar. The Company may change any Paying Agent or Registrar without notice to any Holder. The Company or any of its Subsidiaries may act in any such capacity. (4) INDENTURE. The terms of the Notes include those stated in the Indenture and those made part of the Indenture by the Officers' Certificate dated November 18, 2004 delivered pursuant thereto (the "Officers' Certificate") and the TIA. The Notes are subject to all such terms, and the Holders are referred to the Indenture and the TIA for a statement of them. (5) OPTIONAL REDEMPTION. At any time prior to maturity, the Company will have the option to redeem all or a part of the Notes upon not less than 30 nor more than 60 days' notice, at a redemption price equal to the sum of (1) 100% of the principal amount of any notes being redeemed plus accrued and unpaid interest to, but not including, the redemption date, and (2) the Make-Whole Amount. Unless the Company defaults in the payment of the redemption price, interest will cease to accrue on the Notes or portions thereof called for redemption on the applicable redemption date. (6) MANDATORY REDEMPTION. The Company is not required to make mandatory redemption or sinking fund payments with respect to the Notes. (7) NOTICE OF REDEMPTION. Notice of redemption will be mailed at least 30 days but not more than 60 days before the redemption date to each Holder whose Notes are to be redeemed at its registered address, except that redemption notices may be mailed more than 60 days prior to a redemption date if the notice is issued in connection with a defeasance of the Notes or a satisfaction or discharge of the Indenture. Notes in denominations larger than $1,000 may be redeemed in part but only in whole multiples of $1,000, unless all of the Notes held by a Holder are to be redeemed. (8) DEFEASANCE PRIOR TO MATURITY. The Indenture contains provisions for defeasance of (i) the entire indebtedness of the Notes or (ii) certain covenants and Events of Default with respect to the Notes, in each case upon compliance with certain conditions set forth therein. (9) RESTRICTIVE COVENANTS. The Indenture and the Officers' Certificate impose certain limitations on the Company's and its Subsidiaries', including limitations on the Company's and its subsidiaries ability to create or incur certain Liens on any of their respective properties or assets and to enter into certain sale and lease-back transactions and on the Company's ability to engage in mergers or consolidations or the conveyance, transfer or lease of all or substantially all of its properties and assets. These limitations are subject to a number of important qualifications and exceptions and reference is made to the Indenture and the Officers' Certificate for a description thereof. (10) DENOMINATIONS, TRANSFER, EXCHANGE. The Notes are in registered form without coupons in denominations of $1,000 and integral multiples of $1,000. The transfer of Notes may be registered and Notes may be exchanged as provided in the Indenture. The Registrar and the Trustee may require a Holder, among other things, to furnish appropriate endorsements and transfer documents and the Company may require a Holder to pay any taxes and fees required by law or permitted by the Indenture. The Company need not exchange or register the transfer of any Note or portion of a Note selected for redemption, except for the unredeemed portion of any Note being redeemed in part. Also, the Company need not exchange or register the transfer of 4

any Notes for a period of 15 days before a selection of Notes to be redeemed or during the period between a record date and the corresponding Interest Payment Date. (11) PERSONS DEEMED OWNERS. The registered Holder of a Note may be treated as its owner for all purposes. (12) AMENDMENT, SUPPLEMENT AND WAIVER. Subject to certain exceptions, the Indenture or the Notes may be amended or supplemented with the consent of the Holders of at least a majority in aggregate principal amount of the then outstanding Notes voting as a single class, and any existing Default or Event or Default or compliance with any provision of the Indenture or the Notes may be waived with the consent of the Holders of a majority in aggregate principal amount of the then outstanding Notes voting as a single class. Without the consent of any Holder of a Note, the Indenture or the Notes may be amended or supplemented to cure any ambiguity, defect or inconsistency, to provide for uncertificated Notes in addition to or in place of certificated Notes, to make any change that would not adversely affect the legal rights under the Indenture of any such Holder, to provide for the issuance of any additional notes as permitted by the Indenture, to appoint a successor trustee with respect to the notes and to add to or change any of the provisions of the Indenture necessary to provide for the administration of the trusts in the indenture by more than one trustee, or to comply with the requirements of the SEC in order to effect or maintain the qualification of the Indenture under the TIA. (13) DEFAULTS AND REMEDIES. If an Event of Default shall occur and be continuing, the principal of the Notes may be declared (or, in certain cases, shall ipso facto become) due and payable in the manner and with the effect provided in the Indenture. (14) TRUSTEE DEALINGS WITH COMPANY. The Trustee under the Indenture, in its individual or any other capacity, may deal with the Company or an Affiliate of the Company with the same rights it would have if it were not Trustee. (15) NO RECOURSE AGAINST OTHERS. A director, officer, employee or stockholder of the Company shall not have any liability for any obligations of the Company under the Notes or the Indenture or for any claim based on, in respect of, or by reason of, such obligations or their creation. Each Holder by accepting a Note waives and releases all such liability. The waiver and release are part of the consideration for the issuance of the Notes. (16) AUTHENTICATION. This Note will not be valid until authenticated by the manual signature of the Trustee or an authenticating agent. (17) ABBREVIATIONS. Customary abbreviations may be used in the name of a Holder or an assignee, such as: TEN COM (= tenants in common), TEN ENT (= tenants by the entireties), JT TEN (= joint tenants with right of survivorship and not as tenants in common), CUST (= Custodian), and U/G/M/A (= Uniform Gifts to Minors Act). (18) REGISTRATION RIGHTS OF HOLDERS. In addition to the rights provided to Holders of Notes under the Indenture, Holders of restricted Notes will have all the rights set forth in the Registration Rights Agreement, dated as of November 18, 2004, between the Company and the other parties named on the signature pages thereof (the "Registration Rights Agreement"). (19) CUSIP NUMBERS. Pursuant to a recommendation promulgated by the Committee on Uniform Security Identification Procedures, the Company has caused CUSIP numbers to be printed on the Notes, and the Trustee may use CUSIP numbers in notices of redemption as a 5

convenience to Holders. No representation is made as to the accuracy of such numbers either as printed on the Notes or as contained in any notice of redemption, and reliance may be placed only on the other identification numbers placed thereon. (20) GOVERNING LAW. THE INTERNAL LAW OF THE STATE OF NEW YORK WILL GOVERN AND BE USED TO CONSTRUE THE INDENTURE AND THIS NOTE WITHOUT GIVING EFFECT TO APPLICABLE PRINCIPLES OF CONFLICTS OF LAW TO THE EXTENT THAT THE APPLICATION OF THE LAWS OF ANOTHER JURISDICTION WOULD BE REQUIRED THEREBY. The Company will furnish to any Holder upon written request and without charge a copy of the Indenture and/or the Registration Rights Agreement. Requests may be made to: Amgen Inc. One Amgen Center Drive Thousand Oaks, CA 91320-1799 Attention: Investor Relations 6

ASSIGNMENT FORM To assign this Note, fill in the form below: (I) or (we) assign and transfer this Note to: _________________________________ (Insert assignee's legal name) _______________________________________________________________________________ (Insert assignee's soc. sec. or tax I.D. no.) _______________________________________________________________________________ _______________________________________________________________________________ _______________________________________________________________________________ _______________________________________________________________________________ (Print or type assignee's name, address and zip code) and irrevocably appoint ________________________________________________________ to transfer this Note on the books of the Company. The agent may substitute another to act for him. Date: _______________ Your Signature: ________________________________ (Sign exactly as your name appears on the face of this Note) Signature Guarantee*: _________________________ * Participant in a recognized Signature Guarantee Medallion Program (or other signature guarantor acceptable to the Trustee). 7

EXHIBIT 4.5 EXECUTION COPY REGISTRATION RIGHTS AGREEMENT between AMGEN INC. and MORGAN STANLEY & CO. INCORPORATED MERRILL LYNCH, PIERCE, FENNER & SMITH INCORPORATED Dated as of November 18, 2004

REGISTRATION RIGHTS AGREEMENT This REGISTRATION RIGHTS AGREEMENT (this "AGREEMENT"), dated as of November 18, 2004, is entered into by and between AMGEN INC., a Delaware corporation (the "COMPANY"), and MORGAN STANLEY & CO. INCORPORATED and Merrill Lynch, Pierce, Fenner & Smith Incorporated, acting on behalf of the several parties named in Schedule I (the "INITIAL PURCHASERS") to the Purchase Agreement (as defined below). This Agreement is made pursuant to the Purchase Agreement, dated as of November 15, 2004, between the Company and the Initial Purchasers (the "PURCHASE AGREEMENT"), which provides for the sale by the Company to the Initial Purchasers of (i) an aggregate of $1,000,000,000 principal amount of the Company's 4.00% Senior Notes Due 2009 (the "2009 NOTES") and (ii) an aggregate of $1,000,000,000 principal amount of the Company's 4.85% Senior Notes Due 2014 (the "2014 NOTES" and, together with the 2009 Notes, the "SECURITIES"). In order to induce the Initial Purchasers to enter into the Purchase Agreement, the Company has agreed to provide to the Initial Purchasers and their direct and indirect transferees the registration rights set forth in this Agreement. The execution of this Agreement is a condition to the closing under the Purchase Agreement. In consideration of the foregoing, the parties agree as follows: 1. Definitions. As used in this Agreement, the following capitalized defined terms have the following meanings: "1933 ACT" means the Securities Act of 1933, as amended. "1934 ACT" means the Securities Exchange Act of 1934, as amended. "AGREEMENT" has the meaning set forth in the preamble. "BUSINESS DAY" means any day, other than a Saturday or Sunday, that is not a day on which banking institutions in the Borough of Manhattan, City of New York, are authorized or required by law, regulation or executive order to close. "CLOSING DATE" means the Closing Date as defined in the Purchase Agreement. "COMPANY" has the meaning set forth in the preamble and includes the Company's successors. 1

"EXPIRATION DATE" has the meaning set forth in Section 2(a)(ii). "EXCHANGE OFFER" means the exchange offer by the Company of Exchange Securities for Registrable Securities pursuant to Section 2(a). "EXCHANGE OFFER REGISTRATION" means a registration under the 1933 Act effected pursuant to Section 2(a). "EXCHANGE OFFER REGISTRATION STATEMENT" means an exchange offer registration statement on Form S-4 (or, if applicable, on another appropriate form) and all amendments and supplements to such registration statement, in each case including the Prospectus contained therein, all exhibits thereto and all materials incorporated by reference therein. "EXCHANGE SECURITIES" means securities issued by the Company under the Indenture containing terms identical to the Securities (except that (i) interest thereon shall accrue from the last date on which interest was paid on the Securities or, if no such interest has been paid, from November 18, 2004, and (ii) the Exchange Securities will not contain restrictions on transfer) and to be offered to Holders of Securities in exchange for Securities pursuant to the Exchange Offer. "HOLDER" means a Person who owns, beneficially or of record, Registrable Securities. It is understood and agreed that it is currently contemplated that the Securities and the Exchange Securities will initially be issued in global form and that, until such time, if any, as certificates are issued therefor, the only registered holder of the Securities and the Exchange Securities will be the nominee of The Depository Trust Company. "INDENTURE" means the Indenture, dated as of August 4, 2003, between the Company and JPMorgan Chase Bank, N.A., as trustee, as the same may be amended from time to time in accordance with the terms thereof. "INITIAL PURCHASERS" has the meaning set forth in the preamble. "MAJORITY HOLDERS" means the Holders of a majority of the aggregate principal amount of outstanding Registrable Securities; provided, however, that whenever the consent or approval of Holders of a specified percentage of Registrable Securities is required hereunder, Registrable Securities held by the Company or any of its affiliates (as such term is defined in Rule 405 under the 1933 Act) (other than the Initial Purchasers or subsequent Holders of Registrable Securities, if such subsequent Holders are deemed to be affiliates solely by reason of their holding of such Registrable Securities) shall not be counted in determining whether such consent or approval was given by the Holders of such required percentage or amount. "PARTICIPATING BROKER-DEALER" means any broker-dealer that receives Exchange 2

Securities for its own account in the Exchange Offer in exchange for Securities that were acquired by such broker-dealer as a result of market-making or other trading activities. "PERSON" means an individual, partnership, limited liability company, corporation, trust or unincorporated organization, or a government or agency or political subdivision thereof. "PROSPECTUS" means the prospectus included in a Registration Statement, including any preliminary prospectus, and any such prospectus as amended or supplemented by any prospectus supplement, including a prospectus supplement with respect to the terms of the offering of any portion of the Registrable Securities covered by a Shelf Registration Statement, and by all other amendments and supplements to such prospectus, and in each case including all material incorporated by reference therein. "PURCHASE AGREEMENT" has the meaning set forth in the preamble. "REGISTRABLE SECURITIES" means the Securities; provided, however, that Securities shall cease to be Registrable Securities (i) when a Registration Statement with respect to such Securities has been declared effective under the 1933 Act and such Securities have been disposed of pursuant to such Registration Statement, (ii) when such Securities have been exchanged for Exchange Securities that may be resold to the public without complying with the prospectus delivery requirements of the 1933 Act in an Exchange Offer as contemplated pursuant to Section 2(a) hereof (provided that any Exchange Security that, pursuant to the last sentence of Section 2(a), is included in a prospectus for use in connection with resales by Participating Broker-Dealers shall be deemed to be a Registrable Security with respect to Sections 3, 5 and 6 until resale of such Registrable Securities have been effected within the Resale Period, (iii) when such Securities have been sold to the public pursuant to Rule 144 or are saleable to the public pursuant to Rule 144(k) (or any similar provision then in force, but not Rule 144A) under the 1933 Act or (iv) when such Securities have ceased to be outstanding. "REGISTRATION DEFAULT" has the meaning set forth in Section 4(a). "REGISTRATION EXPENSES" means any and all expenses incident to the performance of or compliance by the Company with this Agreement, including without limitation: (i) all SEC or National Association of Securities Dealers, Inc. registration and filing fees, (ii) all fees and expenses incurred in connection with compliance with state securities or blue sky laws (including reasonable and documented fees and disbursements of one counsel for any Underwriters or Holders in connection with blue sky qualification of any of the Exchange Securities or Registrable Securities), (iii) all expenses of any Persons in preparing or assisting in preparing, word processing, printing and distributing any Registration Statement, any Prospectus, any amendments or supplements thereto, any underwriting agreements, securities sales agreements and other documents relating to the performance of and compliance with this Agreement, (iv) all rating agency fees, (v) all 3

fees and disbursements relating to the qualification of the Indenture under applicable securities laws, (vi) the fees and disbursements of the Trustee and its counsel, (vii) the fees and disbursements of counsel for the Company and, in the case of a Shelf Registration Statement, the reasonable and documented fees and disbursements of one counsel for the Holders (which counsel shall be selected by the Majority Holders and which counsel may also be counsel for the Initial Purchasers) and (viii) the fees and disbursements of the independent public accountants of the Company, including the expenses of any special audits or "cold comfort" letters required by or incident to such performance and compliance, but excluding fees and expenses of counsel to the Underwriters (other than fees and expenses set forth in clause (ii) above) or the Holders and underwriting discounts and commissions and transfer taxes, if any, relating to the sale or disposition of Registrable Securities by a Holder. "REGISTRATION STATEMENT" means any registration statement of the Company that covers any of the Exchange Securities or Registrable Securities pursuant to the provisions of this Agreement and all amendments and supplements to any such Registration Statement, including post-effective amendments, in each case including the Prospectus contained therein, all exhibits thereto and all material incorporated by reference therein. "RESALE PERIOD" has the meaning set forth in Section 2(a). "SEC" means the Securities and Exchange Commission. "SECURITIES" has the meaning set forth in the preamble. "SHELF REGISTRATION" means a registration effected pursuant to Section 2(b). "SHELF REGISTRATION STATEMENT" means a "shelf" registration statement of the Company pursuant to the provisions of Section 2(b) which covers all of the Registrable Securities (but no other securities unless approved by the Holders whose Registrable Securities are covered by such Shelf Registration Statement) on an appropriate form under Rule 415 under the 1933 Act, or any similar rule that may be adopted by the SEC, and all amendments and supplements to such registration statement, including post-effective amendments, in each case including the Prospectus contained therein, all exhibits thereto and all material incorporated by reference therein. "SPECIAL INTEREST" has the meaning set forth in Section 4(a). "TIA" means the Trust Indenture Act of 1939, as amended. "TRUSTEE" means the trustee with respect to the Securities under the Indenture. "UNDERWRITER" has the meaning set forth in Section 3. 4

"UNDERWRITTEN OFFERING" means a registration in which Registrable Securities are sold to an Underwriter for reoffering to the public. 2. Registration Under the 1933 Act. (a) To the extent not prohibited by any applicable law or applicable interpretation of the staff of the SEC, the Company shall prepare and, not later than 180 days following the Closing Date (or if such 180th day is not a Business Day, the next succeeding Business Day), shall use its reasonable efforts to file with the SEC the Exchange Offer Registration Statement with respect to the Exchange Offer. The Company shall use its reasonable efforts to (i) cause the Exchange Offer Registration Statement to become effective under the 1933 Act within 270 days of the Closing Date (or if such 270th day is not a Business Day, the next succeeding Business Day) and (ii) consummate the Exchange Offer within 310 days of the Closing Date (or if such 310th day is not a Business Day, the next succeeding Business Day). Upon the effectiveness of the Exchange Offer Registration Statement, the Company shall promptly commence the Exchange Offer by delivering the related exchange offer Prospectus and accompanying documents, if any, to each Holder stating, in addition to such other disclosures as are required by applicable law: (i) that the Exchange Offer is being made pursuant to this Registration Rights Agreement and that all Registrable Securities validly tendered will be accepted for exchange; (ii) the expiration date for acceptance for exchange (which shall be a date at least 20 Business Days from the date such Prospectus is delivered, and which may be extended by the Company from time to time pursuant to the procedures set forth in such Prospectus) (the "EXPIRATION Date"); (iii) that any Registrable Security not tendered will remain outstanding and continue to accrue interest, but will not retain any rights under this Registration Rights Agreement; (iv) that Holders electing to have a Registrable Security exchanged pursuant to the Exchange Offer will be required to surrender such Registrable Security, together with the enclosed letters of transmittal, if any, to the institution and at the address specified in the notice prior to the close of business on the Expiration Date; and (v) that Holders will be entitled to withdraw their election, not later than the close of business on the Expiration Date, by sending to the institution and at the address specified in such Prospectus a written or facsimile notice of withdrawal setting forth the name of such Holder, the principal amount of Registrable Securities delivered for exchange and a statement that such Holder is withdrawing its election to have such 5

Securities exchanged. As soon as reasonably practicable after the Expiration Date, the Company shall: (i) accept for exchange Registrable Securities or portions thereof tendered and not validly withdrawn pursuant to the Exchange Offer; and (ii) deliver, or cause to be delivered, to the Trustee for cancellation all Registrable Securities or portions thereof so accepted for exchange by the Company and issue, and cause the Trustee to promptly authenticate and deliver to each Holder, an Exchange Security equal in principal amount to the principal amount of the Registrable Securities surrendered by such Holder. The Company shall use its reasonable efforts to complete the Exchange Offer as provided above and shall comply with the applicable requirements of the 1933 Act, the 1934 Act and other applicable laws and regulations in connection with the Exchange Offer. The Exchange Offer shall not be subject to any conditions, other than that the Exchange Offer does not violate applicable law or any applicable interpretation of the staff of the SEC. The Company agrees (x) to include in the Exchange Offer Registration Statement a prospectus for use in any resales by any holder of Exchange Securities that is a Participating Broker-Dealer and (y) to use reasonable efforts to keep such Exchange Offer Registration Statement effective for a period of 90 days after the Expiration Date (as such period may be extended pursuant to the penultimate paragraph of Section 3 of this Agreement) (the "RESALE Period"). (b) In the event that (i) the Company determines that the Exchange Offer Registration provided for in Section 2(a) above is not available or may not be consummated within a reasonable period of time after the Expiration Date because it would violate applicable law or the applicable interpretations of the staff of the SEC, (ii) the Exchange Offer is not for any other reason consummated within 310 days of the Closing Date or (iii) the Exchange Offer has been completed and in the opinion of counsel for the Initial Purchasers, in a form reasonably satisfactory to the Company, a Registration Statement must be filed and a Prospectus must be delivered by the Initial Purchasers in connection with any offering or sale of Registrable Securities, the Company shall use its reasonable efforts to cause to be filed as soon as practicable after such determination, date or notice of such opinion of counsel is given to the Company, as the case may be, a Shelf Registration Statement providing for the sale by the Holders of all of the Registrable Securities and shall use its reasonable efforts to have such Shelf Registration Statement declared effective by the SEC, provided, that, in no event shall the Company be required to file or cause to be declared effective such Shelf Registration Statement before the date on which it is required to file or cause to be declared effective, as applicable, the Exchange Offer Registration Statement pursuant to Section 2(a). In the event the Company is required to file a Shelf Registration Statement solely as a result of the matters referred to in clause (iii) of the preceding sentence, the Company shall file and use its reasonable efforts to have declared 6

effective by the SEC both an Exchange Offer Registration Statement pursuant to Section 2(a) with respect to all Registrable Securities and a Shelf Registration Statement (which may be a combined Registration Statement with the Exchange Offer Registration Statement) with respect to offers and sales of Registrable Securities held by the Initial Purchasers after completion of the Exchange Offer. The Company agrees to use its reasonable efforts to keep the Shelf Registration Statement continuously effective until the expiration of the period referred to in Rule 144(k) with respect to the Registrable Securities or such shorter period that will terminate when all of the Registrable Securities covered by the Shelf Registration Statement have been sold pursuant to the Shelf Registration Statement. The Company further agrees to supplement or amend the Shelf Registration Statement if required by the rules, regulations or instructions applicable to the registration form used by the Company for such Shelf Registration Statement, by the 1933 Act or by any other rules and regulations thereunder for shelf registration or if reasonably requested by a Holder with respect to information relating to such Holder, and to use its reasonable efforts to cause any such amendment to become effective and such Shelf Registration Statement to become usable as soon as reasonably practicable thereafter. The Company agrees to furnish to the Holders of Registrable Securities copies of any such supplement or amendment promptly after its being used or filed with the SEC. (c) The Company shall pay all Registration Expenses in connection with the registration pursuant to Section 2(a) and Section 2(b). Each Holder shall pay all underwriting discounts and commissions and transfer taxes, if any, relating to the sale or disposition of such Holder's Registrable Securities pursuant to the Shelf Registration Statement. (d) Without limiting the remedies available to the Initial Purchasers and the Holders, the Company acknowledges that any failure by the Company to comply with its obligations under Section 2(a) and Section 2(b) may result in material irreparable injury to the Initial Purchasers or the Holders for which there is no adequate remedy at law, that it will not be possible to measure damages for such injuries precisely and that, in the event of any such failure, the Initial Purchasers or any Holder may obtain such relief as may be required to specifically enforce the Company's obligations under Section 2(a) and Section 2(b). 3. Registration Procedures. In connection with the obligations of the Company with respect to the Registration Statements pursuant to Section 2(a) and Section 2(b), the Company shall: (a) prepare and file with the SEC a Registration Statement on the appropriate form under the 1933 Act, which form (x) shall be selected by the Company and (y) shall, in the case of a Shelf Registration, be available for the sale of the Registrable Securities by the selling Holders thereof and (z) shall comply as to form in all material respects with the requirements of the applicable form and include all financial statements required by the SEC to be filed therewith, and use its reasonable efforts to cause such Registration Statement to become effective and remain effective in accordance with Section 2; 7

(b) prepare and file with the SEC such amendments and post-effective amendments to each Registration Statement as may be necessary to keep such Registration Statement effective for the applicable period and cause each Prospectus to be supplemented by any required prospectus supplement and, as so supplemented, to be filed pursuant to Rule 424 under the 1933 Act; to keep each Prospectus current during the period described under Section 4(3) and Rule 174 under the 1933 Act that is applicable to transactions by brokers or dealers with respect to the Registrable Securities or Exchange Securities; (c) in the case of a Shelf Registration, furnish to each selling Holder of Registrable Securities, to counsel for the Initial Purchasers, to counsel for the Holders and to each Underwriter of an Underwritten Offering of Registrable Securities, if any, without charge, as many copies of each Prospectus, including each preliminary Prospectus, and any amendment or supplement thereto and such other documents as such Holder or Underwriter may reasonably request, in order to facilitate the public sale or other disposition of the Registrable Securities; and the Company consents to the use of such Prospectus and any amendment or supplement thereto in accordance with applicable law by each of the selling Holders of Registrable Securities and any such Underwriters in connection with the offering and sale of the Registrable Securities covered by and in the manner described in such Prospectus or any amendment or supplement thereto in accordance with applicable law; (d) use its reasonable efforts to register or qualify the Registrable Securities under all applicable state securities or "blue sky" laws of such jurisdictions as any Holder of Registrable Securities covered by a Registration Statement shall reasonably request in writing by the time the applicable Registration Statement is declared effective by the SEC, to cooperate with reasonable requests by such Holders in connection with any filings required to be made with the National Association of Securities Dealers, Inc. and do any and all other acts and things which may be reasonably necessary to enable such Holder to consummate the disposition in each such jurisdiction of such Registrable Securities owned by such Holder; provided, however, that, without limiting the foregoing, the Company shall not be required to (i) qualify as a foreign corporation or as a dealer in securities in any jurisdiction where it would not otherwise be required to qualify but for this Section 3(d), (ii) file any general consent to service of process, (iii) subject itself to taxation in any such jurisdiction if it is not so subject or (iv) make any changes to its certificate of incorporation or bylaws; (e) in the case of a Shelf Registration, notify each selling Holder of Registrable Securities, counsel for the Holders and counsel for the Initial Purchasers promptly (i) when a Registration Statement has become effective and when any post-effective amendment thereto has been filed and becomes effective, (ii) of any request by the SEC or any state securities authority for amendments and supplements to a Registration Statement and Prospectus or for additional information after the Registration 8

Statement has become effective, (iii) of the issuance by the SEC or any state securities authority of any stop order suspending the effectiveness of a Registration Statement or the initiation of any proceedings for that purpose, (iv) of the happening of any event during the period a Shelf Registration Statement is effective which makes any statement made in such Registration Statement or the related Prospectus untrue in any material respect or which requires the making of any changes in such Registration Statement or Prospectus in order to make the statements therein not misleading and (v) of any determination by the Company that a post-effective amendment to a Registration Statement would be required by applicable law; (f) make every reasonable effort to obtain the withdrawal of any order suspending the effectiveness of a Registration Statement at the earliest practicable date; (g) in the case of a Shelf Registration, furnish to each Holder of Registrable Securities upon written request therefor, without charge, one conformed copy of each Registration Statement and any post-effective amendment thereto (without documents incorporated therein by reference or exhibits thereto, unless requested); (h) in the case of a Shelf Registration, cooperate with the selling Holders of Registrable Securities to facilitate the timely preparation and delivery of certificates representing Registrable Securities to be sold and not bearing any restrictive legends and enable such Registrable Securities to be in such denominations (consistent with the provisions of the Indenture) and registered in such names as the selling Holders may reasonably request in writing at least five Business Days prior to the closing of any sale of Registrable Securities; (i) in the case of a Shelf Registration, upon the occurrence of any event contemplated by Section 3(e)(iv), use its reasonable efforts to prepare and file with the SEC a supplement or post-effective amendment to a Registration Statement or the related Prospectus or any document incorporated therein by reference or file any other required document so that, as thereafter delivered to the purchasers of the Registrable Securities, such Prospectus will not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements therein, in light of the circumstances under which they were made, not misleading. The Company agrees to notify the selling Holders to suspend use of the Prospectus as promptly as reasonably practicable after the occurrence of such an event, and such Holders hereby agree to suspend use of the Prospectus until the Company has amended or supplemented the Prospectus to correct such misstatement or omission; (j) obtain a CUSIP number for all Exchange Securities or Registrable Securities, as the case may be, not later than the effective date of a Registration Statement; (k) cause the Indenture to be qualified under the TIA, in connection with the 9

registration of the Exchange Securities or Registrable Securities, as the case may be, cooperate with the Trustee and the Holders to effect such changes to the Indenture as may be required for the Indenture to be so qualified in accordance with the terms of the TIA and execute, and use its reasonable best efforts to cause the Trustee to execute, all documents as may be required to effect such changes and all other forms and documents required to be filed with the SEC to enable the Indenture to be so qualified in a timely manner; (l) in the case of a Shelf Registration, make available for inspection by any Underwriter participating in any disposition pursuant to such Shelf Registration Statement, and attorneys and accountants designated by such Underwriter, at reasonable times and in a reasonable manner, all financial and other records, pertinent documents and properties of the Company, and cause the respective officers, directors and employees of the Company to supply all information reasonably requested by any such Underwriter, attorney or accountant in connection with a Shelf Registration Statement; (m) if reasonably requested by any Holder of Registrable Securities covered by a Registration Statement, (i) as promptly as reasonably practicable incorporate in a Prospectus supplement or post-effective amendment such information with respect to such Holder as such Holder reasonably requests to be included therein and (ii) make all required filings of such Prospectus supplement or such post-effective amendment after the Company has received written notification of the matters to be incorporated in such filing, and, in the case of a post-effective amendment, use its reasonable best efforts to have the post-effective amendment declared effective; and (n) in the case of a Shelf Registration, enter into such customary underwriting agreements or similar agreements and take all such other customary actions in connection therewith as any selling Holders aggregating at least a majority of the Registrable Securities being sold may reasonably request in order to expedite or facilitate the disposition of such Registrable Securities including, but not limited to, pursuant to an Underwritten Offering and in such connection, (i) to the extent reasonably practicable, make such representations and warranties to the Holders and any Underwriters of such Registrable Securities with respect to the business of the Company and its subsidiaries, the Registration Statement, Prospectus and documents incorporated by reference or deemed incorporated by reference, if any, in each case, in form, substance and scope as are customarily made by issuers to underwriters in underwritten offerings and confirm the same if and when requested, (ii) obtain opinions of counsel to the Company (which counsel may be the Company's general counsel or assistant general counsel and which opinions, in form, scope and substance, shall be reasonably satisfactory to the Holders and such Underwriters and their respective counsel) addressed to each selling Holder and Underwriter of Registrable Securities (it being agreed that the matters to be covered by any such opinion shall include the due incorporation, valid existence and good standing of the Company; the qualification of the Company to transact business as a foreign 10

corporation; the due authorization, execution and delivery of the relevant agreements of the type referred to in this Section 2(o); the due authorization, execution, authentication, issuance and delivery, and the validity and enforceability of the Registrable Securities; the absence of governmental approvals required to be obtained in connection with the Shelf Registration Statement, the offering and sale of the Registrable Securities, this Exchange and Registration Rights Agreement or any agreement of the type referred to in Section 2(o), except such approvals as may be required under state securities or blue sky laws; the material compliance as to form of such Shelf Registration Statement and any documents incorporated by reference therein and of the Indenture with the requirements of the 1933 Act and the TIA and the rules and regulations of the SEC thereunder, respectively; and, as of the date of the opinion and of the Shelf Registration Statement or most recent post-effective amendment thereto, as the case may be, the absence from such Shelf Registration Statement and the prospectus included therein, as then amended or supplemented, and from the documents incorporated by reference therein (in each case other than the financial statements and other financial information contained therein) of an untrue statement of a material fact or the omission to state therein a material fact necessary to make the statements therein not misleading (in the case of such documents, in the light of the circumstances existing at the time that such documents were filed with the SEC under the 1934 Act)), (iii) obtain "cold comfort" letters from the independent certified public accountants of the Company (and, if necessary, any other certified public accountant of any subsidiary of the Company, or of any business acquired by the Company for which financial statements and financial data are or are required to be included in the Registration Statement) addressed to each selling Holder and Underwriter of Registrable Securities, such letters to be in customary form and covering matters of the type customarily covered in "cold comfort" letters in connection with underwritten offerings, and (iv) deliver such documents and certificates as may be reasonably requested by the Holders of a majority in principal amount of the Registrable Securities being sold or the Underwriters, and which are customarily delivered in underwritten offerings, to evidence the continued validity of the representations and warranties of the Company made pursuant to clause (i) above and to evidence compliance with any customary conditions contained in an underwriting agreement. In the case of a Shelf Registration Statement, the Company may require each Holder of Registrable Securities to furnish to the Company such information in writing regarding the Holder and the proposed distribution by such Holder of such Registrable Securities as the Company may from time to time reasonably request in writing. In the case of a Shelf Registration Statement, each Holder agrees that, upon receipt of any notice from the Company of the happening of any event of the kind described in Section 3(e)(iv), such Holder will forthwith discontinue disposition of Registrable Securities pursuant to a Registration Statement until such Holder's receipt of the copies of the supplemented or amended Prospectus contemplated by Section 3(i), and, if so directed by the Company, such Holder will deliver to the Company (at its expense) all copies in its possession, 11

other than permanent file copies then in such Holder's possession, of the Prospectus covering such Registrable Securities current at the time of receipt of such notice. If the Company shall give any such notice to suspend the disposition of Registrable Securities pursuant to a Registration Statement, the Company shall extend the period during which the Registration Statement shall be maintained effective pursuant to this Agreement by the number of days during the period from and including the date of the giving of such notice to and including the date when the Holders shall have received copies of the supplemented or amended Prospectus necessary to resume such dispositions. The Company may give any such notice only twice during any 365 day period and any such suspensions may not exceed 45 days in any three month period or 120 days in any 12 month period. No Special Interest shall accrue or be payable during any such suspension period. The Holders of Registrable Securities covered by a Shelf Registration Statement who desire to do so may sell such Registrable Securities in an Underwritten Offering. In any such Underwritten Offering, the investment banker or investment bankers and manager or managers (the "UNDERWRITERS") that will administer the offering will be selected by the Majority Holders of the Registrable Securities included in such offering. 4. Special Interest. (a) The parties acknowledge that the Holders of Securities or Exchange Securities, as the case may be, will suffer damages if the Company fails to perform its obligations under Section 2 or 3 and that it would not be feasible to ascertain the extent of such damages. Accordingly, in the event that: (i) neither the Exchange Offer Registration Statement nor the Shelf Registration Statement has been filed on or prior to the 180th day following the Closing Date; (ii) neither the Exchange Offer Registration Statement nor the Shelf Registration Statement has been declared effective on or prior to the 270th day following the Closing Date; (iii) the Exchange Offer has not been consummated on or prior to the 310th day following the Closing Date (if the Exchange Offer is then required to be completed); or (iv) after either the Exchange Offer Registration Statement or Shelf Registration Statement has been declared effective, such Registration Statement ceases to be effective or usable in connection with the Exchange Offer or resales of the Securities during a period in which it is required to be effective hereunder (taking into account the suspension periods provided for in the penultimate paragraph of Section 3) without being succeeded within five Business Days by any additional Registration Statement or post- 12

effective amendment covering the Securities or the Exchange Securities, as the case may be, which has been filed and declared effective; (each such event referred to in the foregoing clauses (i) through (iv), a "REGISTRATION DEFAULT"), then special interest ("SPECIAL INTEREST") will accrue on the principal amount of the Securities and the Exchange Securities, respectively (in addition to the stated interest on the Securities and the Exchange Securities), from and including the date on which any Registration Default first occurs and while any such Registration Default has occurred and is continuing, to but excluding the date on which all filings, declarations of effectiveness and consummations, as the case may be, have been achieved which, if achieved on a timely basis, would have prevented the occurrence of all of the then existing Registration Defaults. Special Interest will accrue at a rate of 0.25% per annum during the 90-day period immediately following such first occurrence of a Registration Default and while any such Registration Default has occurred and is continuing, and shall increase to 0.50% per annum for any additional days after such 90-day period during which a Registration Default had occurred and is continuing, until the date on which all of the filings, declarations of effectiveness and consummations referred to in the preceding sentence have been achieved, on which date the interest rate on the Securities and the Exchange Securities, respectively, will revert to the interest rate originally borne by such notes. (b) The Company shall notify the Trustee immediately upon its knowledge of the happening of each and every Registration Default. (c) The Company shall pay the Special Interest due on the Securities or Exchange Securities, as the case may be, by depositing with the Trustee, in trust, for the benefit of the Holders thereof, prior to 10:00 a.m. on the next interest payment date specified in the Indenture sums sufficient to pay the Special Interest then due. The Special Interest due shall be payable on each interest payment date specified by the Indenture to the record holders entitled to receive the interest payment to be made on such date. (d) The parties agree that the Special Interest provided for in this Section 4 constitutes a reasonable estimate of the damages that will be suffered by Holders of Securities or Exchange Securities by reason of the happening of any Registration Default. 5. Indemnification and Contribution. (a) The Company agrees to indemnify and hold harmless each Initial Purchaser, each Holder and each Person, if any, who controls each Initial Purchaser or any Holder within the meaning of either Section 15 of the 1933 Act or Section 20 of the 1934 Act, or is under common control with, or is controlled by, any Initial Purchaser or any Holder, from and against all losses, claims, damages and liabilities (including, without limitation, any legal or other expenses reasonably incurred by any Initial Purchaser, any Holder or any such controlling or affiliated Person in connection with defending or investigating any such action or claim) caused by any untrue statement or alleged untrue statement of a material fact contained in any Registration Statement (or any amendment thereto) pursuant to which Exchange Securities or 13

Registrable Securities were registered under the 1933 Act, including all documents incorporated therein by reference, or caused by any omission or alleged omission to state therein a material fact required to be stated therein or necessary to make the statements therein not misleading, or caused by any untrue statement or alleged untrue statement of a material fact contained in any Prospectus (as amended or supplemented if the Company shall have furnished any amendments or supplements thereto), or caused by any omission or alleged omission to state therein a material fact necessary to make the statements therein in light of the circumstances under which they were made not misleading, except insofar as such losses, claims, damages or liabilities are caused by any such untrue statement or omission or alleged untrue statement or omission based upon information relating to an indemnified party furnished to the Company in writing by or on behalf of such indemnified party expressly for use therein, provided however that, the foregoing indemnity with respect to any preliminary Prospectus shall not inure to the benefit of any Holder from whom the person asserting any such losses, claims, damages or liabilities purchased Securities, or any person controlling such Holder, if a copy of the final Prospectus (as then amended or supplemented if the Company shall have furnished any amendments or supplements thereto) was not sent or given by or on behalf of such Holder to such person, if required by law so to have been delivered, at or prior to the written confirmation of the sale of the Securities to such person, and if the final Prospectus (as so amended or supplemented) would have cured the defect giving rise to such loss, claim, damage or liability. In connection with any Underwritten Offering permitted by Section 3, the Company will also indemnify the Underwriters, if any, participating in the distribution, their officers and directors and each Person who controls such Persons (within the meaning of the 1933 Act and the 1934 Act) to the same extent as provided above with respect to the indemnification of the Holders, if requested in connection with any Registration Statement. (b) Each Holder agrees, severally and not jointly, to indemnify and hold harmless the Company, each Initial Purchaser and the other selling Holders, and each of their respective directors, officers who sign the Registration Statement and each Person, if any, who controls the Company, any Initial Purchaser and any other selling Holder within the meaning of either Section 15 of the 1933 Act or Section 20 of the 1934 Act to the same extent as the foregoing indemnity from the Company to each of the Initial Purchasers and the Holders, but only with reference to information relating to such Holder furnished to the Company in writing by such Holder expressly for use in any Registration Statement (or any amendment thereto) or any Prospectus (or any amendment or supplement thereto). (c) In case any proceeding (including any governmental investigation) shall be instituted involving any Person in respect of which indemnity may be sought pursuant to either paragraph (a) or paragraph (b) above, such Person (the "INDEMNIFIED PARTY") shall promptly notify the Person against whom such indemnity may be sought (the "INDEMNIFYING PARTY") in writing and the indemnifying party, upon request of the indemnified party, shall retain counsel reasonably satisfactory to the indemnified party to represent the indemnified party and any others the indemnifying party may designate in such proceeding and shall pay the fees and disbursements of such counsel related to such proceeding. In any such proceeding, any 14

indemnified party shall have the right to retain its own counsel, but the fees and expenses of such counsel shall be at the expense of such indemnified party unless (i) the indemnifying party and the indemnified party shall have mutually agreed to the retention of such counsel or (ii) the named parties to any such proceeding (including any impleaded parties) include both the indemnifying party and the indemnified party and representation of both parties by the same counsel would be inappropriate due to actual or potential differing interests between them. It is understood that the indemnifying party shall not, in connection with any proceeding or related proceedings in the same jurisdiction, be liable for (a) the reasonable and documented fees and expenses of more than one separate firm (in addition to any local counsel) for the Initial Purchasers and all Persons, if any, who control any Initial Purchaser within the meaning of either Section 15 of the 1933 Act or Section 20 of the 1934 Act, (b) the reasonable and documented fees and expenses of more than one separate firm (in addition to any local counsel) for the Company, its directors, its officers who sign the Registration Statement and each Person, if any, who controls the Company within the meaning of either such Section and (c) the reasonable and documented fees and expenses of more than one separate firm (in addition to any local counsel) for all Holders and all Persons, if any, who control any Holders within the meaning of either such Section, and that all such fees and expenses shall be reimbursed as they are incurred. In such case involving any Initial Purchaser and Persons who control any Initial Purchaser, such firm shall be designated in writing by Morgan Stanley & Co. Incorporated. In such case involving the Holders and such Persons who control Holders, such firm shall be designated in writing by the Majority Holders. In all other cases, such firm shall be designated by the Company. The indemnifying party shall not be liable for any settlement of any proceeding effected without its written consent but, if settled with such consent or if there be a final judgment for the plaintiff, the indemnifying party agrees to indemnify the indemnified party from and against any loss or liability by reason of such settlement or judgment. Notwithstanding the foregoing sentence, if at any time an indemnified party shall have requested an indemnifying party to reimburse the indemnified party for fees and expenses of counsel as contemplated by the second and third sentences of this paragraph, the indemnifying party agrees that it shall be liable for any settlement of any proceeding effected without its written consent if (i) such settlement is entered into more than 30 days after receipt by such indemnifying party of the aforesaid request and (ii) such indemnifying party shall not have reimbursed the indemnified party for such fees and expenses of counsel in accordance with such request prior to the date of such settlement. No indemnifying party shall, without the prior written consent of the indemnified party, effect any settlement of any pending or threatened proceeding in respect of which such indemnified party is or could have been a party and indemnity could have been sought hereunder by such indemnified party, unless such settlement includes an unconditional release of such indemnified party from all liability on claims that are the subject matter of such proceeding. (d) If the indemnification provided for in paragraph (a) or paragraph (b) of this Section 5 is unavailable to an indemnified party or insufficient in respect of any losses, claims, damages or liabilities, then each indemnifying party under such paragraph, in lieu of indemnifying such indemnified party thereunder, shall contribute to the amount paid or payable by such indemnified party as a result of such losses, claims, damages or liabilities in such 15

proportion as is appropriate to reflect the relative fault of the indemnifying party or parties on the one hand and of the indemnified party or parties on the other hand in connection with the statements or omissions that resulted in such losses, claims, damages or liabilities, as well as any other relevant equitable considerations. The relative fault of the Company and the Holders shall be determined by reference to, among other things, whether the untrue or alleged untrue statement of a material fact or the omission or alleged omission to state a material fact relates to information supplied by the Company or by the Holders and the parties' relative intent, knowledge, access to information and opportunity to correct or prevent such statement or omission. The Holders' respective obligations to contribute pursuant to this Section 5(d) are several in proportion to the respective principal amount of Registrable Securities of such Holder that were registered pursuant to a Registration Statement. (e) The Company and each Holder agree that it would not be just or equitable if contribution pursuant to this Section 5 were determined by pro rata allocation or by any other method of allocation that does not take account of the equitable considerations referred to in paragraph (d) above. The amount paid or payable by an indemnified party as a result of the losses, claims, damages and liabilities referred to in paragraph (d) above shall be deemed to include, subject to the limitations set forth above, any legal or other expenses reasonably incurred by such indemnified party in connection with investigating or defending any such action or claim. Notwithstanding the provisions of this Section 5, no Holder shall be required to indemnify or contribute any amount in excess of the amount by which the total price at which Registrable Securities were sold by such Holder exceeds the amount of any damages that such Holder has otherwise been required to pay by reason of such untrue or alleged untrue statement or omission or alleged omission. No Person guilty of fraudulent misrepresentation (within the meaning of Section 11(f) of the 1933 Act) shall be entitled to contribution from any Person who was not guilty of such fraudulent misrepresentation. The remedies provided for in this Section 5 are not exclusive and shall not limit any rights or remedies which may otherwise be available to any indemnified party at law or in equity. The indemnity and contribution provisions contained in this Section 5 shall remain operative and in full force and effect regardless of (i) any termination of this Agreement, (ii) any investigation made by or on behalf of any Initial Purchaser, any Holder or any Person controlling any Initial Purchaser or any Holder, or by or on behalf of the Company, its officers or directors or any Person controlling the Company, (iii) acceptance of any of the Exchange Securities and (iv) any sale of Registrable Securities pursuant to a Shelf Registration Statement. 16

6. Miscellaneous. (a) No Inconsistent Agreements. The Company has not entered into, and on or after the date of this Agreement will not enter into, any agreement which is inconsistent with the rights granted to the Holders of Registrable Securities in this Agreement or otherwise conflicts with the provisions hereof. The rights granted to the Holders hereunder do not in any way conflict with and are not inconsistent with the rights granted to the holders of the Company's other issued and outstanding securities under any such agreements. (b) Amendments and Waivers. The provisions of this Agreement, including the provisions of this sentence, may not be amended, modified or supplemented, and waivers or consents to departures from the provisions hereof may not be given unless the Company has obtained the written consent of Holders of at least a majority in aggregate principal amount of the outstanding Registrable Securities affected by such amendment, modification, supplement, waiver or consent; provided, however, that no amendment, modification, supplement, waiver or consent to any departure from the provisions of Section 5 shall be effective as against any Holder of Registrable Securities unless consented to in writing by such Holder. (c) Notices. All notices and other communications provided for or permitted hereunder shall be made in writing by hand-delivery, registered first-class mail, telex, telecopier, or any courier guaranteeing overnight delivery (i) if to a Holder, at the most current address given by such Holder to the Company by means of a notice given in accordance with the provisions of this Section 6(c), which address initially is, with respect to the Initial Purchasers, the address set forth in the Purchase Agreement; and (ii) if to the Company, initially at the Company's address set forth in the Purchase Agreement and thereafter at such other address, notice of which is given in accordance with the provisions of this Section 6(c). All such notices and communications shall be deemed to have been duly given: at the time delivered by hand, if personally delivered; five Business Days after being deposited in the mail, postage prepaid, if mailed; when answered back, if telexed; when receipt is acknowledged, if telecopied; and on the next Business Day if timely delivered to an air courier guaranteeing overnight delivery. Copies of all such notices, demands, or other communications shall be concurrently delivered by the Person giving the same to the Trustee, at the address specified in the Indenture. (d) Successors and Assigns. This Agreement shall inure to the benefit of and be binding upon the successors, assigns and transferees of each of the parties, including, without limitation and without the need for an express assignment, subsequent Holders; provided that nothing herein shall be deemed to permit any assignment, transfer or other disposition of Registrable Securities in violation of the terms of the Purchase Agreement. If any transferee of any Holder shall acquire Registrable Securities, in any manner, whether by operation of law or otherwise, such Registrable Securities shall be held subject to all of the terms of this Agreement, 17

and by taking and holding such Registrable Securities such Person shall be conclusively deemed to have agreed to be bound by and to perform all of the terms and provisions of this Agreement and such Person shall be entitled to receive the benefits hereof. The Initial Purchasers (in their capacity as Initial Purchasers) shall have no liability or obligation to the Company with respect to any failure by a Holder to comply with, or any breach by any Holder of, any of the obligations of such Holder under this Agreement. (e) Purchases and Sales of Securities. The Company shall not, and shall use its reasonable efforts to cause its affiliates (as defined in Rule 405 under the 1933 Act) not to, purchase and then resell or otherwise transfer any Securities. (f) Third Party Beneficiary. The Holders shall be third party beneficiaries to the agreements made hereunder between the Company, on the one hand, and the Initial Purchasers, on the other hand, and shall have the right to enforce such agreements directly to the extent they deem such enforcement necessary or advisable to protect their rights as Holders hereunder. (g) Counterparts. This Agreement may be executed in any number of counterparts and by the parties hereto in separate counterparts, each of which when so executed shall be deemed to be an original and all of which taken together shall constitute one and the same agreement. (h) Headings. The headings in this Agreement are for convenience of reference only and shall not limit or otherwise affect the meaning hereof. (i) Governing Law. This Agreement shall be governed by the laws of the State of New York, including, without limitation, Section 5-1401 of the New York General Obligations Law. (j) Severability. In the event that any one or more of the provisions contained herein, or the application thereof in any circumstance, is held invalid, illegal or unenforceable, the validity, legality and enforceability of any such provision in every other respect and of the remaining provisions contained herein shall not be affected or impaired thereby. (k) Section References. Unless otherwise indicated, references in this Agreement to sections are to the sections of this Agreement. (l) Termination. This Agreement shall terminate when there are no longer any Registrable Securities, except for (i) any liabilities or obligations under Section 2(c) and Section 5 and (ii) the Company's obligation to make payments of, and to provide for, Special Interest under Section 4, to the extent Special Interest accrued prior to such time, each of which shall remain in effect in accordance with its terms. 18

IN WITNESS WHEREOF, the parties have executed this Agreement as of the date first written above. AMGEN INC. By /s/ Richard D. Nanula ----------------------------------- Name: Richard D. Nanula Title: Executive Vice President and Chief Financial Officer Confirmed and accepted as of the date first above written: MORGAN STANLEY & CO. INCORPORATED MERRILL LYNCH, PIERCE, FENNER & SMITH INCORPORATED By: MORGAN STANLEY & Co. INCORPORATED By /s/ Harold J. Hendershot III ---------------------------------- Name: Harold J. Hendershot III Title: Executive Director

EXHIBIT 10.1 EXECUTION COPY AMGEN INC. $1,000,000,000 4.00% SENIOR NOTES DUE 2009 $1,000,000,000 4.85% SENIOR NOTES DUE 2014 PURCHASE AGREEMENT Dated as of November 15, 2004

Morgan Stanley & Co. Incorporated Merrill Lynch, Pierce, Fenner & Smith Incorporated Barclays Capital Inc. Bear, Stearns & Co. Inc. Citigroup Global Markets Inc. Credit Suisse First Boston LLC Goldman, Sachs & Co. J.P. Morgan Securities Inc. Mitsubishi Securities International plc c/o Morgan Stanley & Co. Incorporated 1585 Broadway New York, New York 10036 Dear Sirs and Mesdames: Amgen Inc., a Delaware corporation (the "COMPANY"), proposes to issue and sell to the several purchasers named in Schedule I hereto (the "INITIAL PURCHASERS") $1,000,000,000 principal amount of its 4.00% Senior Notes due 2009 (the "2009 NOTES") and $1,000,000,000 principal amount of its 4.85% Senior Notes due 2014 (the "2014 NOTES" and, together with the 2009 Notes, the "SECURITIES") to be issued pursuant to the provisions of an Indenture, dated as of August 4, 2003, between the Company and JP Morgan Chase Bank, N.A., as Trustee (the "TRUSTEE") (the "INDENTURE"). Pursuant to the transactions contemplated by this purchase agreement (this "AGREEMENT"), the Securities will be offered and sold to the Initial Purchasers and reoffered by the Initial Purchasers without being registered under the Securities Act of 1933, as amended (the "SECURITIES ACT"), to qualified institutional buyers in compliance with the exemption from registration provided by Rule 144A under the Securities Act and in offshore transactions in reliance on Regulation S under the Securities Act ("REGULATION S"). The Initial Purchasers and their direct and indirect transferees ("SUBSEQUENT PURCHASERS") will be entitled to the benefits of a Registration Rights Agreement, dated as of November 18, 2004, between the Company and the Initial Purchasers (the "REGISTRATION RIGHTS AGREEMENT"). In connection with the offering of the Securities, the Company has prepared a preliminary offering memorandum (the "PRELIMINARY MEMORANDUM") and will prepare a final offering memorandum (the "FINAL MEMORANDUM" and, together with the Preliminary Memorandum, each a "MEMORANDUM") including or incorporating by reference a description of the 2

terms of the Securities, the terms of the offering and a description of the Company. As used herein, the term "Memorandum" shall include in each case the documents incorporated by reference therein. The terms "SUPPLEMENT," "AMENDMENT" and "AMEND" as used herein with respect to a Memorandum shall include all documents deemed to be incorporated by reference in the Preliminary Memorandum or Final Memorandum that are filed subsequent to the date of such Memorandum with the Securities and Exchange Commission (the "COMMISSION") pursuant to the Securities Exchange Act of 1934, as amended (the "EXCHANGE ACT"). "Memorandum" means, with respect to any date or time referred to in this Agreement, the most recent memorandum (whether the Final Memorandum, or any amendment or supplement to such document), including exhibits thereto and any documents incorporated by reference therein, that has been prepared and delivered by the Company to the Initial Purchasers in connection with their offering of the Securities. 1. Representations and Warranties. (a) The Company represents and warrants to, and agrees with, you that as of the date hereof and as of the Closing Date: (i) The Final Memorandum, as of its date and at the Closing Date, will not contain any untrue statement of a material fact or omit to state any material fact necessary to make the statements therein, in light of the circumstances in which they were made, not misleading, provided that this representation, warranty and agreement shall not apply to statements in or omissions from the Memorandum made in reliance on and in conformity with information furnished in writing by any Initial Purchaser to the Company expressly for use in such Memorandum. (ii) The Memorandum as delivered from time to time shall incorporate by reference the Company's Annual Report on Form 10-K for the fiscal year ended December 31, 2003; the Company's Quarterly Reports on Form 10-Q for the quarterly periods ended March 31, 2004, June 30, 2004, and September 30, 2004; and the Company's Current Reports on Form 8-K filed with the Commission on March 29, 2004 and October 12, 2004. The documents incorporated or deemed to be incorporated by reference in the Memorandum at the time they were or hereafter are filed, or, if amended, as so amended, with the Commission complied and, with respect to future filings, will comply, in all material respects with the requirements of the Exchange Act and the rules and regulations of the Commission thereunder (the "1934 ACT REGULATIONS"), and, when read together with the other information in the Memorandum, at the date of the Memorandum and at the Closing Date, will not include an untrue statement of a material fact or omit to state a material fact 3

required to be stated therein or necessary to make the statements therein, in light of the circumstances in which they were made, not misleading. (iii) Ernst & Young, LLP, which has audited certain consolidated financial statements of the Company and its consolidated subsidiaries to be incorporated by reference in the Memorandum, are independent registered public accountants with respect to the Company and its subsidiaries within the meaning of Regulation S-X under the Securities Act. (iv) The consolidated financial statements included in the Company's Annual Report on Form 10-K for the fiscal year ended December 31, 2003 and incorporated by reference in the Memorandum present fairly, in all material respects, the financial position of the Company and its consolidated subsidiaries at December 31, 2003 and 2002 and the statements of operations and cash flows of the Company and its consolidated subsidiaries for each of the three years in the period ended December 31, 2003 in conformity with accounting principles generally accepted in the United States ("GAAP"). The related financial statement schedules, when considered in relation to the basic consolidated financial statements taken as a whole, present fairly in all material respects the information set forth therein. (v) Since the respective dates as of which information is given in the Final Memorandum, except as otherwise stated therein, (A) there has been no material adverse change in the financial condition or in the earnings of the Company and its subsidiaries considered as one enterprise, (B) there have been no transactions entered into by the Company or any of its subsidiaries, other than those in the ordinary course of business, which are material with respect to the Company and its subsidiaries considered as one enterprise, and (C) there has been no dividend or distribution of any kind declared, paid or made by the Company on any class of its capital stock not described in the Final Memorandum. (vi) Each of the Company, Amgen Manufacturing, Limited, a Bermuda corporation ("Amgen Manufacturing") and Immunex Corporation, a Washington corporation ("Immunex" and, together with Amgen Manufacturing, the "SIGNIFICANT SUBSIDIARIES"), has been duly incorporated or organized and is validly existing in good standing under the laws of the jurisdiction in which it is incorporated, chartered or organized with the corporate power and authority to own or lease, as the case may be, and to operate its properties and conduct its business as described in the Memorandum and is duly qualified to do business as a foreign corporation or organization and is in good standing under the laws 4

of each jurisdiction which requires such qualification, except, in each case, where the failure so to qualify or to be in good standing would not have a material adverse effect on the financial condition of the Company and its subsidiaries, considered as one enterprise (a "MATERIAL ADVERSE EFFECT"). (vii) All the issued and outstanding shares of capital stock of the Significant Subsidiaries have been duly and validly authorized and issued and are fully paid and nonassessable, and, except as may be otherwise set forth in the Memorandum, all outstanding shares of capital stock of the Significant Subsidiaries are owned by the Company either directly or through a wholly-owned subsidiary free and clear of any security interest, mortgage, pledge, lien, encumbrance, claim or equity; none of the outstanding shares of capital stock of the Significant Subsidiaries was issued in violation of the preemptive or similar rights of any securityholder of either Significant Subsidiary. (viii) Neither of the Significant Subsidiaries is currently prohibited, directly or indirectly, from paying any dividends to the Company, from making any other distribution on such subsidiary's capital stock, from repaying to the Company any loans or advances to such subsidiary from the Company or from transferring any of such subsidiary's property or assets to the Company or any other subsidiary of the Company, except as may be described in or contemplated by the Memorandum and except as would not result in a Material Adverse Effect. (ix) The outstanding shares of capital stock of the Company have been duly and validly authorized and issued and are fully paid and nonassessable; none of the outstanding shares of capital stock of the Company was issued in violation of the preemptive or similar rights of any security holder of the Company. (x) This Agreement has been duly authorized, executed and delivered by the Company. (xi) At the Closing Date, the Indenture will have been duly authorized by the Company, and when duly executed and delivered by the Company and, assuming the due authorization, execution and delivery of the Indenture by the Trustee, will be a valid and binding agreement of the Company enforceable against the Company in accordance with its terms, except (A) to the extent that a waiver of rights under any usury laws may be unenforceable and as the enforceability thereof may be limited by bankruptcy, insolvency, fraudulent conveyance, moratorium or other similar laws now or hereafter in effect relating to or affecting the enforcement of creditors' rights and remedies generally and (B) as rights of acceleration and the availability of equitable remedies may be limited 5

by equitable principles of general applicability, whether or not enforcement is sought at law or in equity. (xii) At the Closing Date, the Registration Rights Agreement will have been duly authorized by the Company and, when executed and delivered by the Company, assuming the due authorization, execution and delivery of the Registration Rights Agreement by the Initial Purchasers, will constitute a valid and binding agreement of the Company, enforceable against the Company in accordance with its terms, except (A) as the enforceability thereof may be limited by bankruptcy, insolvency, fraudulent conveyance, moratorium or other similar laws now or hereafter in effect relating to or affecting the enforcement of creditors' rights and remedies generally, (B) as rights of acceleration and the availability of equitable remedies may be limited by equitable principles of general applicability, whether or not enforcement is sought at law or in equity and (C) as rights to indemnification or contribution may be limited by federal or state securities laws or public policy considerations. (xiii) The Securities have been duly authorized by the Company, and, at the Closing Date, will have been duly executed by the Company and, when authenticated, issued and delivered in the manner provided for in the Indenture and delivered against payment of the Purchase Price (as defined below) therefore as provided in this Agreement, will be the valid and binding obligations of the Company, enforceable against the Company in accordance with their terms, except (A) to the extent that a waiver of rights under any usury laws may be unenforceable and as the enforceability thereof may be limited by bankruptcy, insolvency, fraudulent conveyance, moratorium or other similar laws now or hereafter in effect relating to or affecting the enforcement of creditors' rights and remedies generally and (B) as rights of acceleration and the availability of equitable remedies may be limited by equitable principles of general applicability, whether or not enforcement is sought at law or in equity. At the Closing Date, the Securities will be in the form contemplated by, and will be entitled to the benefits of, the Indenture and the Registration Rights Agreement. (xiv) The Securities, the Indenture and the Registration Rights Agreement will conform in all material respects to the respective statements relating thereto contained in the Memorandum. (xv) Neither the Company nor any of its Significant Subsidiaries is in violation of its charter or by-laws or in default in the performance or observance of any obligation, agreement, covenant or condition contained in any contract, indenture, mortgage, deed of trust, loan or credit 6

agreement, note, lease or other agreement or instrument to which the Company or any of its subsidiaries is a party or by which it or any of them may be bound, or to which any of the property or assets of the Company or any of its subsidiaries is subject (collectively, "AGREEMENTS AND INSTRUMENTS") except for such defaults that would not result in a Material Adverse Effect. (xvi) The execution, delivery and performance by the Company of its obligations under this Agreement, the Indenture, the Registration Rights Agreement and the Securities will not contravene any provision of (A) the Restated Certificate of Incorporation, as amended, or Amended and Restated Bylaws of the Company, (B) any agreement or other instrument binding upon the Company or its business or assets that is material to the financial condition of the Company and its subsidiaries, considered as one enterprise, (C) applicable law and (D) any judgment, order, decree of any governmental body, agency or court having jurisdiction over the Company or its business or assets. (xvii) Except as disclosed in the Memorandum, there is no action, suit, proceeding, inquiry or investigation before or brought by any court or governmental agency or body, domestic or foreign, now pending, or, to the knowledge of the Company, threatened, against or affecting the Company or any of its subsidiaries which might reasonably be expected to result in a Material Adverse Effect, or which might reasonably be expected to materially and adversely affect the properties or assets of the Company or any of its subsidiaries or the consummation of the transactions contemplated by this Agreement or the performance by the Company of its obligations hereunder. The aggregate of all pending legal or governmental proceedings to which the Company or any of its subsidiaries is a party or of which any of their respective property or assets is the subject which are not described in the Memorandum, including ordinary routine litigation incidental to the business, could not reasonably be expected to result in a Material Adverse Effect. (xviii) The Company and its Significant Subsidiaries own or possess, or can acquire on reasonable terms, adequate patents, patent rights, licenses, inventions, copyrights, know-how (including trade secrets and other unpatented and/or unpatentable proprietary or confidential information, systems or procedures), trademarks, service marks and trade names (collectively, "INTELLECTUAL PROPERTY") which in each case are material to the financial condition of the Company and its subsidiaries, considered as one enterprise and, except as described in the Memorandum, neither the Company nor any of its Significant Subsidiaries has received any notice of any infringement of or conflict with asserted rights of others 7

with respect to any Intellectual Property, which infringement or conflict, singly or in the aggregate, could reasonably be expected to result in a Material Adverse Effect. (xix) No consent, approval, authorization or order of or qualification with any governmental body or agency is required for the performance by the Company of its obligations under this Agreement, the Indenture or in connection with the offering, issuance and sale of the Securities, except such as have been already obtained or will have been obtained prior to the Closing Date. (xx) The Company has all necessary consents, authorizations, approvals, orders, certificates and permits of and from (collectively, "GOVERNMENTAL PERMITS"), and has made all declarations and filings with, all federal, state, local and other governmental authorities, all self-regulatory organizations and all courts and other tribunals, to own, lease, license and use its properties and assets and to conduct its business in the manner described in the Memorandum, except to the extent that the failure to obtain or file would not have a Material Adverse Effect; and the Company has not received any notice of proceedings relating to the revocation or modification of any such Governmental Permits which, singly or in the aggregate, could reasonably be expected to result in a Material Adverse Effect. (xxi) Except as described in the Memorandum and except as would not, singly or in the aggregate, result in a Material Adverse Effect, (A) neither the Company nor any of its subsidiaries is in violation of any federal, state, local or foreign statute, law, rule, regulation, ordinance, code, policy or rule of common law or any judicial or administrative interpretation thereof, including any judicial or administrative order, consent, decree or judgment, relating to pollution or protection of human health, the environment (including, without limitation, ambient air, surface water, groundwater, land surface or subsurface strata) or wildlife, including, without limitation, laws and regulations relating to the release or threatened release of chemicals, pollutants, contaminants, wastes, toxic substances, hazardous substances, petroleum or petroleum products (collectively, "HAZARDOUS MATERIALS") or to the manufacture, processing, distribution, use, treatment, storage, disposal, transport or handling of Hazardous Materials (collectively, "ENVIRONMENTAL LAWS"), (B) the Company and its subsidiaries have all permits, authorizations and approvals required under any applicable Environmental Laws and are each in compliance with their requirements, (C) there are no pending or threatened administrative, regulatory or judicial actions, suits, demands, demand letters, claims, liens, notices of noncompliance or violation, 8

investigations or proceedings relating to any Environmental Law against the Company or any of its subsidiaries and (D) there are no events or circumstances that might reasonably be expected to form the basis of an order for clean-up or remediation, or an action, suit or proceeding by any private party or governmental body or agency, against or affecting the Company or any of its subsidiaries relating to Hazardous Materials or any Environmental Laws. (xxii) Neither the Company nor any of its subsidiaries is in violation of any Federal or state law or regulation relating to occupational safety and health or to the storage, handling and transportation of hazardous or toxic materials; the Company and each of its subsidiaries have received all permits, licenses or other approvals required of them under applicable Federal and state occupational safety and health laws and environmental laws and regulations to conduct their respective businesses, and the Company and each such subsidiary is in compliance with all terms and conditions of any such permit, license or approval, except any such violation of law or regulation, failure to receive required permits, licenses or other approvals or failure to comply with the terms and conditions of such permits, licenses or approvals that would not, singly or in the aggregate, result in a Material Adverse Effect, except as described in or contemplated by the Memorandum. (xxiii) The Company is not, and after giving effect to the offering and sale of the Securities and the application of the proceeds thereof as described in the Memorandum, will not be an "investment company," or an entity "controlled" by an investment company, as such terms are defined in the Investment Company Act of 1940, as amended. (xxiv) The Company and each of its subsidiaries are insured by insurers of recognized financial responsibility against such losses and risks and in such amounts as are reasonable and consistent with sound business practice. (xxv) Neither the Company nor any of its affiliates, as such term is defined in Rule 501(b) of Regulation D under the Securities Act (each, an "AFFILIATE"), has, directly or indirectly, solicited any offer to buy, sold or offered to sell or otherwise negotiated in respect of, or will solicit any offer to buy or offer to sell or otherwise negotiate in respect of, any security (as defined in the Securities Act) that is or would be integrated with the sale of the Securities in a manner that would require the Securities to be registered under the Securities Act. (xxvi) The Securities are eligible for resale pursuant to Rule 144A under the Securities Act and will not be, at the Closing Date, of the same 9

class as securities listed on a national securities exchange registered under Section 6 of the Exchange Act, or quoted in a U.S. automated interdealer quotation system. (xxvii) None of the Company, any of its Affiliates or any person acting on its or any of their behalf (other than the Initial Purchasers and their Affiliates, as to whom the Company makes no representation) has engaged or will engage, in connection with the offering of the Securities, in any form of general solicitation or general advertising within the meaning of Rule 502(c) of Regulation D under the Securities Act or in any manner involving a public offering within the meaning of Section 4(2) of the Securities Act. (xxviii) Subject to compliance by the Initial Purchasers with the representations and warranties set forth in Section 4 and the procedures set forth in Section 7 hereof, it is not necessary in connection with the offer, sale and delivery of the Securities to the Initial Purchasers and to each Subsequent Purchaser in the manner contemplated by this Agreement and the Memorandum to register the Securities under the Securities Act. (xxix) The Company is subject to the reporting requirements of Section 13 or Section 15(d) of the Exchange Act. (xxx) With respect to those Securities sold in reliance on Regulation S, (A) none of the Company, its Affiliates or any person acting on its or their behalf (other than the Initial Purchasers and their Affiliates, as to whom the Company makes no representation) has engaged or will engage in any directed selling efforts within the meaning of Regulation S and (B) each of the Company and its Affiliates and any person acting on its or their behalf (other than the Initial Purchasers and their Affiliates, as to whom the Company makes no representation) has complied and will comply with the offering restrictions requirement of Regulation S. (xxxi) There are no persons with registration rights or other similar rights to have any securities included in any registration statement filed pursuant to a registration agreement or in any offering made pursuant to such registration statement. (b) Officer's Certificate. Any certificate signed by any officer of the Company and delivered to the Initial Purchasers or counsel for the Initial Purchasers in connection with the issuance of the Securities shall be deemed a representation and warranty by the Company, as to matters covered thereby, to the Initial Purchasers. 10

2. Agreements to Sell and Purchase. The Company hereby agrees to sell to the several Initial Purchasers, and each Initial Purchaser, upon the basis of the representations and warranties herein contained, but subject to the conditions hereinafter stated, agrees, severally and not jointly, to purchase from the Company, (i) at a purchase price of 99.453% of the principal amount thereof, the respective principal amount of 2009 Notes set forth opposite its name in Schedule I hereto and (ii) at a purchase price of 99.534% of the principal amount thereof, the respective principal amount of 2014 Notes set forth opposite its name in Schedule I hereto (together, the "PURCHASE PRICE"), plus accrued interest, if any, to the Closing Date. The Company hereby agrees that, without the prior written consent of Morgan Stanley & Co. Incorporated on behalf of the Initial Purchasers, it will not, during the period beginning on the date of this Agreement and continuing to and including the Closing Date, offer, sell, contract to sell or otherwise dispose of any debt of the Company or warrants to purchase debt of the Company substantially similar to the Securities (other than the sale of the Securities under this Agreement). 3. Terms of Offering. You have advised the Company that the Initial Purchasers will make an offering of the Securities purchased by the Initial Purchasers hereunder on the terms to be set forth in the Final Memorandum, as soon as practicable after this Agreement is entered into as in your reasonable judgment is advisable and that it is the intention of the Initial Purchasers not to hold any Securities after the Closing Date. 4. Payment and Delivery. Payment for the Securities shall be made to the Company in Federal or other funds immediately available in New York City against delivery of such Securities for the respective accounts of the several Initial Purchasers at 10:00 a.m., New York City time, on November 18, 2004, or at such other time on the same or such other date, not later than November 26, 2004, as shall be designated in writing by you. The time and date of such payment are hereinafter referred to as the "CLOSING DATE." Certificates for the Securities shall be in global form and registered in the name of Cede & Co., as nominee of the Depository Trust Company. The certificates evidencing the Securities shall be delivered to the Trustee on the Closing Date for the respective accounts of the several Initial Purchasers, with any transfer taxes payable in connection with the transfer of the Securities to the Initial Purchasers duly paid, against payment of the Purchase Price therefor plus accrued interest, if any, to the date of payment and delivery. 5. Conditions to the Initial Purchasers' Obligations. The several obligations of the Initial Purchasers to purchase and pay for the Securities on the Closing Date is subject to the following conditions: 11

(a) Subsequent to the execution and delivery of this Agreement and prior to the Closing Date: (i) there shall not have occurred any downgrading, nor shall any notice have been given of any intended or potential downgrading or of any review for a possible change that does not indicate the direction of the possible change, in the rating accorded of any of the Company's securities by any "nationally recognized statistical rating organization," as such term is defined for purposes of Rule 436(g)(2) under the Securities Act; and (ii) there shall not have been, since the date of this Agreement or since the respective dates as of which information is given in the Final Memorandum, any material adverse change in the financial condition or in the earnings of the Company and its subsidiaries, taken as a whole. (b) The Initial Purchasers shall have received on the Closing Date a certificate, dated the Closing Date and signed by the chief executive officer or the chief financial officer of the Company, to the effect set forth in Section 5(a)(i) and to the effect that (i) the representations and warranties of the Company contained in this Agreement are true and correct in all material respects as of the Closing Date and (ii) the Company has complied in all material respects with all of the agreements and satisfied in all material respects all of the conditions on its part to be performed or satisfied hereunder on or before the Closing Date. The officer signing and delivering such certificate may rely upon the best of his or her knowledge as to proceedings threatened. (c) The Initial Purchasers shall have received on the Closing Date an opinion or opinions and a negative assurances letter of Latham & Watkins LLP, outside counsel for the Company, dated the Closing Date, covering the matters set forth in Exhibit A. Each such opinion or opinions will include such assumptions, qualifications and exceptions as are customary in transactions of this type. The opinion or opinions may be limited to the federal laws of the United States, the internal laws of the State of New York and the General Corporation Law of the State of Delaware. Such counsel may also state that, insofar as such opinions involve factual matters, they have relied, to the extent they deem proper, upon certificates of officers of the Company and its subsidiaries and certificates of public officials. 12

(d) The Initial Purchasers shall have received on the Closing Date an opinion of the Company's general counsel or any assistant general counsel, dated the Closing Date, covering the matters set forth in Exhibit B. Such opinion will include such assumptions, qualifications and exceptions as are customary in transactions of this type. The opinion will be limited to the federal laws of the United States and the General Corporation Law of the State of Delaware. Such counsel may also state that, insofar as such opinion involves factual matters, they have relied, to the extent they deem proper, upon certificates of officers of the Company and its subsidiaries and certificates of public officials. (e) The Initial Purchasers shall have received on the Closing Date an opinion of Cleary, Gottlieb, Steen & Hamilton, counsel for the Initial Purchasers, dated the Closing Date, to the effect set forth in Exhibit C. (f) The Initial Purchasers shall have received on the date hereof a letter, dated the date hereof, in form and substance reasonably satisfactory to the Initial Purchasers, from Ernst & Young LLP, independent registered public accountants, containing statements and information of the type ordinarily included in accountants' "comfort letters" to underwriters with respect to the financial statements and certain financial information contained in or incorporated by reference into the Final Memorandum and on the Closing Date, the Initial Purchasers shall have received a letter from Ernst & Young LLP, in form and substance reasonably satisfactory to the Initial Purchasers, to the effect that they reaffirm the statements made in the letter dated the date hereof. 6. Covenants of the Company. In further consideration of the agreements of the Initial Purchasers contained in this Agreement, the Company covenants with each Initial Purchaser as follows: (a) To furnish to you in New York City, without charge, prior to 10:00 a.m. New York City time on the business day next succeeding the date of this Agreement and during the period mentioned in Section 6(c), as many copies of the Final Memorandum, and any supplements and amendments thereto as you may reasonably request. (b) Before amending or supplementing any Memorandum, to furnish to you a copy of each such proposed amendment or supplement and not to use any such proposed amendment or supplement to which you reasonably object. (c) If, at any time prior to the completion of the resale of the Securities by the Initial Purchasers, any event shall occur or condition 13

exist as a result of which it is necessary, in the reasonable opinion of the Initial Purchasers or counsel for the Initial Purchasers, to amend or supplement the Final Memorandum in order to make the statements therein, in the light of the circumstances when the Final Memorandum is delivered to a purchaser, not misleading, or if, in the reasonable opinion of counsel for the Initial Purchasers, it is necessary to amend or supplement the Final Memorandum to comply with applicable law, forthwith to prepare and furnish, at its own expense, to the Initial Purchasers, either amendments or supplements to the Final Memorandum so that the statements in the Final Memorandum as so amended or supplemented will not, in the light of the circumstances when the Final Memorandum is delivered to a purchaser, be misleading or so that the Final Memorandum, as amended or supplemented, will comply with applicable law. (d) To endeavor to qualify the Securities for offer and sale under the securities or Blue Sky laws of such jurisdictions as you shall reasonably request provided, however, that the Company shall not be required to (i) qualify as a foreign corporation or as a dealer in securities in any jurisdiction where it would not otherwise be required to qualify but for this Section 3(d), (ii) file any general consent to service of process, (iii) subject itself to taxation in any such jurisdiction if it is not so subject or (iv) make any changes to its certificate of incorporation or bylaws. (e) Whether or not the transactions contemplated in this Agreement are consummated or this Agreement is terminated, to pay or cause to be paid all expenses incident to the performance of its obligations under this Agreement, including: (i) the fees, disbursements and expenses of the Company's counsel and the Company's accountants in connection with the issuance and sale of the Securities and all other fees or expenses of the Company in connection with the preparation of each Memorandum and all amendments and supplements thereto, including all printing costs associated therewith, and the delivering of copies thereof to the Initial Purchasers, in the quantities herein above specified, (ii) all costs and expenses related to the preparation, issuance and delivery of the Securities to the Initial Purchasers, including any transfer or other taxes payable thereon, (iii) all expenses in connection with the qualification of the Securities for offer and sale under state securities laws as provided in Section 6(d) hereof, including filing fees and the reasonable fees and disbursements of counsel for the Initial Purchasers in connection with such qualification and in connection with the preparation of any Blue Sky or legal investment memorandum, (iv) any fees charged by rating agencies for the rating of the Securities, (v) the costs and charges of the Trustee, and (vi) all other cost and expenses incident to the performance of the obligations of the Company hereunder for which provision is not 14

otherwise made in this Section. It is understood, however, that except as provided in clause (iii) of this Section 8, and the last paragraph of Section 10, the Initial Purchasers will pay all of their costs and expenses, including fees and disbursements of their counsel, transfer taxes payable on resale of any of the Securities by them and any advertising expenses connected with any offers they may make. (f) Not to, and to cause its Affiliates not to, sell, offer for sale or solicit offers to buy or otherwise negotiate in respect of any security (as defined in the Securities Act) which could be integrated with the sale of the Securities in a manner which would require the registration under the Securities Act of the Securities. (g) Not to solicit any offer to buy or offer or sell the Securities by means of any form of general solicitation or general advertising (as those terms are used in Regulation D under the Securities Act) or in any manner involving a public offering within the meaning of Section 4(2) of the Securities Act. (h) While any of the Securities remain "restricted securities" within the meaning of Rule 144(a)(3) of the Securities Act, to make available, upon request, to any seller of such Securities the information specified in Rule 144A(d)(4) under the Securities Act, unless the Company is then subject to Section 13 or 15(d) of the Exchange Act. (i) Not to, and to cause its Affiliates or any person acting on its or their behalf (other than the Initial Purchasers) not to, engage in any directed selling efforts (as that term is defined in Regulation S) with respect to the Securities, and the Company and its Affiliates and each person acting on its or their behalf (other than the Initial Purchasers) will comply with the offering restrictions requirement of Regulation S. (j) During the period of two years after the Closing Date, the Company will not, and will not permit any of its affiliates (as defined in Rule 144 under the Securities Act) to resell any of the Securities which constitute "restricted securities" under Rule 144 that have been reacquired by any of them. 7. Offering of Securities; Restrictions on Transfer. (a) Each Initial Purchaser, severally and not jointly, represents and warrants that such Initial Purchaser is a qualified institutional buyer as defined in Rule 144A under the Securities Act (a "QIB"). Each Initial Purchaser, severally and not jointly, agrees with the Company that (i) it will not solicit offers for, or offer or sell, such Securities by any form of general solicitation or general advertising (as those terms are used in Regulation D under the Securities Act) or in any manner 15

involving a public offering within the meaning of Section 4(2) of the Securities Act and (ii) it will solicit offers for such Securities only from, and will offer such Securities only to, persons that it reasonably believes to be (A) in the case of offers inside the United States, QIBs and (B) in the case of offers outside the United States, to persons other than U.S. persons ("FOREIGN PURCHASERS," which term shall include dealers or other professional fiduciaries in the United States acting on a discretionary basis for foreign beneficial owners (other than an estate or trust)) in reliance upon Regulation S under the Securities Act that, in each case, in purchasing such Securities are deemed to have represented and agreed as provided in the Final Memorandum under the caption "Transfer Restrictions". (b) Each Initial Purchaser, severally and not jointly, represents, warrants, and agrees with respect to offers and sales outside the United States that: (i) such Initial Purchaser understands that no action has been or will be taken in any jurisdiction by the Company that would permit a public offering of the Securities, or possession or distribution of either Memorandum or any other offering or publicity material relating to the Securities, in any country or jurisdiction where action for that purpose is required; (ii) such Initial Purchaser will comply with all applicable laws and regulations in each jurisdiction in which it acquires, offers, sells or delivers Securities or has in its possession or distributes either Memorandum or any such other material, in all cases at its own expense; (iii) the Securities have not been registered under the Securities Act and may not be offered or sold within the United States or to, or for the account or benefit of, U.S. persons except in accordance with Rule 144A or Regulation S under the Securities Act or pursuant to another exemption from the registration requirements of the Securities Act; (iv) such Initial Purchaser has offered the Securities and will offer and sell the Securities (A) as part of their distribution at any time and (B) otherwise until 40 days after the later of the commencement of the offering and the Closing Date, only in accordance with Rule 903 of Regulation S or as otherwise permitted in Section 7(a); accordingly, neither such Initial Purchaser, its Affiliates nor any persons acting on its or their behalf have engaged or will engage in any directed selling efforts (within the meaning of Regulation S) with respect to the Securities, and any such Initial Purchaser, its Affiliates and any such persons have complied and will comply with the offering restrictions requirement of Regulation S; 16

(v) such Initial Purchaser has (A) not offered or sold and, prior to the date six months after the Closing Date, will not offer or sell any Securities to persons in the United Kingdom except to persons whose ordinary activities involve them in acquiring, holding, managing or disposing of investments (as principal or agent) for the purposes of their businesses or otherwise in circumstances which have not resulted and will not result in an offer to the public in the United Kingdom within the meaning of the Public Offers of Securities Regulations 1995; (B) complied and will comply with all applicable provisions of the Financial Services and Markets Act 2000 ("FSMA") with respect to anything done by it in relation to the Securities in, from or otherwise involving the United Kingdom, and (C) has only communicated or caused to be communicated and will only communicate or cause to be communicated any invitation or inducement to engage in investment activity (within the meaning of Section 21 of FSMA) received by it in connection with the issue or sale of the Securities in circumstances in which Section 21(1) of FSMA does not apply to the Company; (vi) such Initial Purchaser understands that the Securities have not been and will not be registered under the Securities and Exchange Law of Japan, and represents that it has not offered or sold, and agrees not to offer or sell, directly or indirectly, any Securities in Japan or for the account of any resident thereof except pursuant to any exemption from the registration requirements of the Securities and Exchange Law of Japan and otherwise in compliance with applicable provisions of Japanese law; and (vii) such Initial Purchaser agrees that, at or prior to confirmation of sales of the Securities, it will have sent to each distributor, dealer or person receiving a selling concession, fee or other remuneration that purchases Securities from it during the restricted period a confirmation or notice to substantially the following effect: "The Securities covered hereby have not been registered under the U.S. Securities Act of 1933 (the "Securities Act") and may not be offered and sold within the United States or to, or for the account or benefit of, U.S. persons (i) as part of their distribution at any time or (ii) otherwise until 40 days after the later of the commencement of the offering and the closing date, except in either case in accordance with Regulation S (or Rule 144A if available) under the Securities Act. Terms used above have the meaning given to them by Regulation S." Terms used in this Section 7(b) have the meanings given to them by Regulation S. 17

8. Indemnity and Contribution. (a) The Company will indemnify and hold harmless each Initial Purchaser against any losses, claims, damages or liabilities, joint or several, to which such Initial Purchaser may become subject, under the Securities Act or otherwise, insofar as such losses, claims, damages or liabilities (or actions in respect thereof) arise out of or are based upon an untrue statement or alleged untrue statement of a material fact contained in either Memorandum or any other prospectus (including any preliminary prospectus) relating to the Securities, or any amendment or supplement thereto, or arise out of or are based upon the omission or alleged omission to state therein a material fact required to be stated therein or necessary to make the statements therein not misleading, and will reimburse such Initial Purchaser for any legal or other expenses reasonably incurred by it in connection with investigating or defending any such action or claim as such expenses are incurred; provided, however, that the Company shall not be liable in any such case to the extent that any such loss, claim, damage or liability arises out of or is based upon an untrue statement or alleged untrue statement or omission or alleged omission made in either Memorandum or any other prospectus (including any preliminary prospectus) relating to the Securities, or in any such amendment or supplement thereto, in reliance upon and in conformity with written information furnished to the Company by such Initial Purchaser expressly for use in either Memorandum as amended or supplemented; provided, however, that the foregoing indemnity with respect to any Preliminary Memorandum or preliminary prospectus, including any amendment or supplement thereto, shall not inure to the benefit of any Initial Purchaser from whom the person asserting any such losses, claims, damages or liabilities purchased the Securities, or any person controlling such Initial Purchaser, if a copy of the Final Memorandum (as then amended or supplemented if the Company shall have furnished any amendments or supplements thereto) was not sent or given by or on behalf of such Initial Purchaser to such person, if required by law so to have been delivered, at or prior to the written confirmation of the sale of the Securities to such person, and if the Final Memorandum (as so amended or supplemented) would have cured the defect giving rise to such loss, claim, damage or liability. (b) Each Initial Purchaser will indemnify and hold harmless the Company against any losses, claims, damages or liabilities to which the Company may become subject, under the Securities Act or otherwise, insofar as such losses, claims, damages or liabilities (or actions in respect thereof) arise out of or are based upon an untrue statement or alleged untrue statement of a material fact contained in either Memorandum or any other prospectus (including any preliminary prospectus) relating to the Securities, or any amendment or supplement thereto, or arise out of or are based upon the omission or alleged omission to state therein a material fact required to be stated therein or necessary to make the statements therein not misleading, in each case to the extent, but only to the extent, 18

that such untrue statement or alleged untrue statement or omission or alleged omission was made in either Memorandum or any other prospectus (including any preliminary prospectus) relating to the Securities, or any such amendment or supplement thereto, in reliance upon and in conformity with written information furnished to the Company by such Initial Purchaser expressly for use in either Memorandum as amended or supplemented; and will reimburse the Company for any legal or other expenses reasonably incurred by the Company in connection with investigating or defending any such action or claim as such expenses are incurred. (c) As promptly as reasonably practical after receipt by an indemnified party under paragraph (a) or (b) above of notice of the commencement of any action, such indemnified party shall, if a claim in respect thereof is to be made against the indemnifying party under such subsection, notify the indemnifying party in writing of the commencement thereof; but the omission so to notify the indemnifying party shall not relieve it of its obligations (i) under paragraph (a) or (b), as applicable, of this Section 8 unless and only to the extent that the indemnifying party is materially prejudiced by the failure to notify, or (ii) from any liability which it may have to any indemnified party otherwise than under such applicable subsection. In case any such action shall be brought against any indemnified party and it shall notify the indemnifying party of the commencement thereof, the indemnifying party shall be entitled to participate therein and, to the extent that it shall wish, jointly with any other indemnifying party similarly notified, to assume the defense thereof, and retain counsel reasonably satisfactory to the indemnified party to represent the indemnified party and any others the indemnifying party may designate in such proceeding and shall pay the fees and disbursements of such counsel related to such proceeding. In any such proceeding, any indemnified party shall have the right to retain its own counsel, but the fees and expenses of such counsel shall be at the expense of such indemnified party unless (1) the indemnifying party and the indemnified party shall have mutually agreed to the retention of such counsel or (2) the named parties to any such proceeding (including any impleaded parties) include both the indemnifying party and the indemnified party and representation of both parties by the same counsel would, in the written opinion of legal counsel to the indemnified party, be inappropriate due to actual or potential differing interests between them. It is understood that the indemnifying party shall not, in respect of the legal expenses of any indemnified party in connection with any proceeding or related proceedings in the same jurisdiction, be liable for the fees and expenses of more than one separate firm (in addition to any local counsel) for all such indemnified parties and that all such fees and expenses shall be 19

reimbursed as they are incurred. Such firm shall be designated in writing by Morgan Stanley & Co. Incorporated or, if Morgan Stanley & Co. Incorporated is not an indemnified party and is not reasonably likely to become an indemnified party, by the Initial Purchasers that are indemnified parties, in the case of parties indemnified pursuant to paragraph (a) above, and by the Company, in the case of parties indemnified pursuant to paragraph (b) above. No indemnifying party shall, without the written consent of the indemnified party, effect the settlement or compromise of, or consent to the entry of any judgment with respect to, any pending or threatened action or claim in respect of which indemnification or contribution may be sought hereunder (whether or not the indemnified party is an actual or potential party to such action or claim) unless such settlement, compromise or judgment (I) includes an unconditional release of the indemnified party from all liability arising out of such action or claim and (II) does not include a statement as to, or an admission of, fault, culpability or a failure to act, by or on behalf of any indemnified party. (d) If the indemnification provided for in this Section 8 is unavailable or insufficient to hold harmless an indemnified party under subsection (a) or (b) above in respect of any losses, claims, damages or liabilities (or actions in respect thereof) referred to therein, then each indemnifying party shall contribute to the amount paid or payable by such indemnified party as a result of such losses, claims, damages or liabilities (or actions in respect thereof) in such proportion as is appropriate to reflect the relative benefits received by the Company on the one hand and each Initial Purchaser on the other from the offering of the Securities to which such loss, claim, damage or liability (or action in respect thereof) relates. If, however, the allocation provided by the immediately preceding sentence is not permitted by applicable law, then each indemnifying party shall contribute to such amount paid or payable by such indemnified party in such proportion as is appropriate to reflect not only such relative benefits but also the relative fault of the Company on the one hand and each Initial Purchaser on the other in connection with the statements or omissions which resulted in such losses, claims, damages or liabilities (or actions in respect thereof), as well as any other relevant equitable considerations. The relative benefits received by the Company on the one hand and each Initial Purchaser on the other shall be deemed to be in the same proportion as the total net proceeds from the sale of Securities (before deducting expenses) received by the Company bear to the total commissions and discounts received by such Initial Purchaser in respect thereof. The relative fault shall be determined by reference to, among other things, whether the untrue or alleged untrue statement of a material fact or the omission or alleged omission to state a material fact required to 20

be stated therein or necessary in order to make the statements therein not misleading relates to information supplied by the Company on the one hand or by any Initial Purchaser on the other and the parties' relative intent, knowledge, access to information and opportunity to correct or prevent such statement or omission. The Company and each Initial Purchaser agree that it would not be just and equitable if contribution pursuant to this subsection (d) were determined by pro rata allocation (even if all Initial Purchasers were treated as one entity for such purpose) or by any other method of allocation which does not take account of the equitable considerations referred to above in this subsection (d). The amount paid or payable by an indemnified party as a result of the losses, claims, damages or liabilities (or actions in respect thereof) referred to above in this subsection (d) shall be deemed to include any legal or other expenses reasonably incurred by such indemnified party in connection with investigating or defending any such action or claim. Notwithstanding the provisions of this subsection (d), an Initial Purchaser shall not be required to contribute any amount in excess of the amount by which the total price at which the Securities referred to in paragraph (d) above that were offered and sold to the public through such Initial Purchaser exceeds the amount of any damages which such Initial Purchaser has otherwise been required to pay by reason of such untrue or alleged untrue statement or omission or alleged omission. No person guilty of fraudulent misrepresentation (within the meaning of Section 11(f) of the Securities Act) shall be entitled to contribution from any person who was not guilty of such fraudulent misrepresentation. The obligations of each of the Initial Purchasers under this subsection (d) to contribute are several in proportion to the respective purchases made by or through each such Initial Purchaser to which such loss, claim, damage or liability (or action in respect thereof) relates and are not joint. (e) The obligations of the Company under this Section 8 shall be in addition to any liability which the Company may otherwise have and shall extend, upon the same terms and conditions, to each person, if any, who controls any Initial Purchaser within the meaning of Section 15 of the Securities Act or Section 20 of the Exchange Act; and the obligations of each Initial Purchaser under this Section 8 shall be in addition to any liability which such Initial Purchaser may otherwise have and shall extend, upon the same terms and conditions, to each officer and director of the Company and to each person, if any, who controls the Company within the meaning of Section 15 of the Securities Act or Section 20 of the Exchange Act. 9. Termination. This Agreement shall be subject to termination in the Initial Purchasers' absolute discretion, by written notice to the Company, if (a) 21

after the execution and delivery of this Agreement and prior to the Closing Date (i) trading generally shall have been suspended or materially limited on or by, as the case may be, any of the New York Stock Exchange, the American Stock Exchange or the National Association of Securities Dealers, Inc., (ii) trading of any securities of the Company shall have been suspended on any exchange or in any over-the-counter market, (iii) a general moratorium on commercial banking activities in New York shall have been declared by either Federal or New York State authorities, or (iv) there shall have occurred any outbreak or escalation of hostilities or any change in financial markets or any calamity or crisis that, in the judgment of the Initial Purchasers, is material and adverse and (b) in the case of any of the events specified in clauses (a)(i) through (iv), such event, singly or together with any other such event, makes it, in the judgment of the Initial Purchasers, impracticable to market the Securities on the terms and in the manner contemplated in the Final Memorandum. 10. Effectiveness; Defaulting Initial Purchasers. This Agreement shall become effective upon the execution and delivery hereof by the parties hereto. If, on the Closing Date, any one or more of the Initial Purchasers shall fail or refuse to purchase Securities that it or they have agreed to purchase hereunder on such date, and the aggregate principal amount of Securities which such defaulting Initial Purchaser or Initial Purchasers agreed but failed or refused to purchase is not more than one-tenth of the aggregate principal amount of Securities to be purchased on such date, the other Initial Purchasers shall be obligated severally in the proportions that the principal amount of Securities set forth opposite their respective names in Schedule I bears to the aggregate principal amount of Securities set forth opposite the names of all such non-defaulting Initial Purchasers, or in such other proportions as you may specify, to purchase the Securities which such defaulting Initial Purchaser or Initial Purchasers agreed but failed or refused to purchase on such date; provided that in no event shall the principal amount of Securities that any Initial Purchaser has agreed to purchase pursuant to this Agreement be increased pursuant to this Section 10 by an amount in excess of one-ninth of such principal amount of Securities without the written consent of such Initial Purchaser. If, on the Closing Date any Initial Purchaser or Initial Purchasers shall fail or refuse to purchase Securities which it or they have agreed to purchase hereunder on such date and the aggregate principal amount of Securities with respect to which such default occurs is more than one-tenth of the aggregate principal amount of Securities to be purchased on such date, and arrangements satisfactory to you and the Company for the purchase of such Securities are not made within 36 hours after such default, this Agreement shall terminate without liability on the part of any non-defaulting Initial Purchaser or of the Company. In any such case either you or the Company shall have the right to postpone the Closing Date, but in no event for longer than seven days, in order that the required changes, if any, in the Final 22

Memorandum or in any other documents or arrangements may be effected. Any action taken under this paragraph shall not relieve any defaulting Initial Purchaser from liability in respect of any default of such Initial Purchaser under this Agreement. If this Agreement shall be terminated by the Initial Purchasers, or any of them, because of any failure or refusal on the part of the Company to comply with the terms or to fulfill any of the conditions of this Agreement, or if for any reason the Company shall be unable to perform its obligations under this Agreement, the Company will reimburse the Initial Purchasers or such Initial Purchasers as have so terminated this Agreement with respect to themselves, severally, for all out-of-pocket expenses (including the fees and disbursements of their counsel) reasonably incurred by such Initial Purchasers in connection with this Agreement or the offering contemplated hereunder. 11. Counterparts. This Agreement may be executed in any number of counterparts and by the parties in separate counterparts, each of which when so executed shall be deemed to be an original and all of which taken together shall constitute one and the same agreement. 12. Applicable Law. This Agreement shall be governed by the laws of the State of New York, including, without limitation, Section 5-1401 of the New York General Obligations Law. 13. Severability. In the event that any one or more of the provisions contained herein, or the application thereof in any circumstance, is held invalid, illegal or unenforceable, the validity, legality and enforceability of any such provision in every other respect and of the remaining provisions contained herein shall not be affected or impaired thereby. 14. Section References. Unless otherwise indicated, references in this Agreement to sections are to the sections of this Agreement. 15. Headings. The headings in this Agreement are for convenience of reference only and shall not limit or otherwise affect the construction hereof. 16. Notice. All notices and other communications hereunder shall be in writing and shall be deemed to have been duly given if mailed or transmitted by any standard form of telecommunication. Notices to the Initial Purchasers shall be directed to Morgan Stanley & Co. Incorporated at 1585 Broadway, New York, New York 10036 (facsimile no. 212-507-2409), Attention: Fixed Income Syndicate, with a copy to Cleary, Gottlieb, Steen & Hamilton at One Liberty Plaza, New York, New York 10006 (facsimile no. 212-225-3999), Attention: Raymond B. Check; notices to the Company shall be directed to it at One Amgen Center Drive, Thousand Oaks, California 91320-1799 (facsimile no. 805-499- 23

8011), Attention: Corporate Secretary, with a copy to Latham & Watkins LLP, 633 West Fifth Street, Suite 4000, Los Angeles, California 90071 (facsimile no. 213-891-8763), Attention: Brian Cartwright. [Remainder of page intentionally left blank] 24

Very truly yours, AMGEN INC. By: /s/ Richard D. Nanula ----------------------------------- Name: Richard D. Nanula Title: Executive Vice President and Chief Financial Officer Accepted as of the date hereof MORGAN STANLEY & Co. INCORPORATED MERRILL LYNCH, PIERCE, FENNER & SMITH INCORPORATED Acting severally on behalf of themselves and the several Initial Purchasers named in Schedule I hereto. By: Morgan Stanley & Co. Incorporated By: /s/ Harold J. Hendershot III ------------------------------------- Name: Harold J. Hendershot III Title: Executive Director

SCHEDULE I PRINCIPAL AMOUNT OF SECURITIES INITIAL PURCHASERS TO BE PURCHASED 4.00% SENIOR NOTES DUE 2009 Merrill Lynch, Pierce, Fenner & Smith Incorporated ................................. $ 377,500,000 Morgan Stanley & Co. Incorporated............... $ 377,500,000 Barclays Capital Inc............................ $ 35,000,000 Bear, Stearns & Co. Inc......................... $ 35,000,000 Citigroup Global Markets Inc.................... $ 35,000,000 Credit Suisse First Boston LLC.................. $ 35,000,000 Goldman, Sachs & Co............................. $ 35,000,000 J.P. Morgan Securities Inc...................... $ 35,000,000 Mitsubishi Securities International plc......... $ 35,000,000 Total:........................................ $ 1,000,000,000 4.85% SENIOR NOTES DUE 2014 Merrill Lynch, Pierce, Fenner & Smith Incorporated ................................. $ 377,500,000 Morgan Stanley & Co. Incorporated............... $ 377,500,000 Barclays Capital Inc............................ $ 35,000,000 Bear, Stearns & Co. Inc......................... $ 35,000,000 Citigroup Global Markets Inc.................... $ 35,000,000 Credit Suisse First Boston LLC.................. $ 35,000,000 Goldman, Sachs & Co............................. $ 35,000,000 J.P. Morgan Securities Inc...................... $ 35,000,000 Mitsubishi Securities International plc......... $ 35,000,000 Total:........................................ $ 1,000,000,000 S-I-1