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<?xml version="1.0" encoding="windows-1252"?> |
<ownershipDocument> |
| <schemaVersion> X0508 </schemaVersion> |
| <documentType> 4 </documentType> |
| <periodOfReport> 2024-03-18 </periodOfReport> |
| <issuer> |
| | <issuerCik> 0000318154 </issuerCik> |
| | <issuerName> AMGEN INC </issuerName> |
| | <issuerTradingSymbol> AMGN </issuerTradingSymbol> |
| | </issuer> |
| <reportingOwner> |
| | <reportingOwnerId> |
| | | <rptOwnerCik> 0001677950 </rptOwnerCik> |
| | | <rptOwnerName> Santos Esteban </rptOwnerName> |
| | | </reportingOwnerId> |
| | <reportingOwnerAddress> |
| | | <rptOwnerStreet1> ONE AMGEN CENTER DRIVE </rptOwnerStreet1> |
| | | <rptOwnerStreet2></rptOwnerStreet2> |
| | | <rptOwnerCity> THOUSAND OAKS </rptOwnerCity> |
| | | <rptOwnerState> CA </rptOwnerState> |
| | | <rptOwnerZipCode> 91320-1799 </rptOwnerZipCode> |
| | | <rptOwnerStateDescription></rptOwnerStateDescription> |
| | | </reportingOwnerAddress> |
| | <reportingOwnerRelationship> |
| | | <isOfficer> 1 </isOfficer> |
| | | <officerTitle> EVP, Operations </officerTitle> |
| | | </reportingOwnerRelationship> |
| | </reportingOwner> |
| <aff10b5One> 0 </aff10b5One> |
| <nonDerivativeTable> |
| | <nonDerivativeTransaction> |
| | | <securityTitle> |
| <value> Common Stock </value> |
| </securityTitle> |
| | | <transactionDate> |
| <value> 2024-03-18 </value> |
| </transactionDate> |
| | | <transactionCoding> |
| <transactionFormType> 4 </transactionFormType> |
| <transactionCode> F </transactionCode> |
| <equitySwapInvolved> 0 </equitySwapInvolved> |
| </transactionCoding> |
| | | <transactionTimeliness></transactionTimeliness> |
| | | <transactionAmounts> |
| <transactionShares> |
| <value> 6137 </value> |
| </transactionShares> |
| <transactionPricePerShare> |
| <value> 268.87 </value> |
| </transactionPricePerShare> |
| <transactionAcquiredDisposedCode> |
| <value> D </value> |
| </transactionAcquiredDisposedCode> |
| </transactionAmounts> |
| | | <postTransactionAmounts> |
| <sharesOwnedFollowingTransaction> |
| <value> 70213 </value> |
| <footnoteId id="F1"/> |
| <footnoteId id="F2"/> |
| </sharesOwnedFollowingTransaction> |
| </postTransactionAmounts> |
| | | <ownershipNature> |
| <directOrIndirectOwnership> |
| <value> D </value> |
| </directOrIndirectOwnership> |
| </ownershipNature> |
| | | </nonDerivativeTransaction> |
| | <nonDerivativeHolding> |
| | | <securityTitle> |
| <value> Common Stock </value> |
| </securityTitle> |
| | | <postTransactionAmounts> |
| <sharesOwnedFollowingTransaction> |
| <value> 856.6105 </value> |
| <footnoteId id="F3"/> |
| </sharesOwnedFollowingTransaction> |
| </postTransactionAmounts> |
| | | <ownershipNature> |
| <directOrIndirectOwnership> |
| <value> I </value> |
| </directOrIndirectOwnership> |
| <natureOfOwnership> |
| <value> 401K Plan </value> |
| </natureOfOwnership> |
| </ownershipNature> |
| | | </nonDerivativeHolding> |
| | </nonDerivativeTable> |
| <footnotes> |
| | <footnote id="F1"> These shares include the following Restricted Stock Units (RSUs) granted under the Company's equity plans: 1,151 RSUs which will vest on 5/5/2024; 2,656 RSUs which will vest in installments of 1,308 on 4/30/2024 and 1,348 on 4/30/2025; 3,637 RSUs which will vest in two installments of 1,200 each on 5/2/2024 and 5/2/2025, and one installment of 1,237 on 5/2/2026; and 3,559 RSUs which will vest in two installments of 1,174 each on 5/2/2025 and 5/2/2026, and one installment of 1,211 on 5/2/2027. Vested RSUs will be paid in shares of the Company's common stock on a one-to-one basis. </footnote> |
| | <footnote id="F2"> These shares include 796 Dividend Equivalents (DEs) granted pursuant to the Amgen Inc. Amended and Restated 2009 Equity Incentive Plan and subject to a qualifying dividend reinvestment plan. DEs are credited to the reporting person's unvested RSUs and are paid out in shares of the Company's common stock on a one-to-one basis according to the vesting schedule, along with a cash payment for any remaining fractional share amount. </footnote> |
| | <footnote id="F3"> These shares are acquired under the Company's 401(k) Plan and represent interests in the Company's stock fund as of this filing. </footnote> |
| | </footnotes> |
| <ownerSignature> |
| | <signatureName> /s/ Esteban Santos </signatureName> |
| | <signatureDate> 2024-03-18 </signatureDate> |
| | </ownerSignature> |
| </ownershipDocument> |