<SEC-DOCUMENT>0000950170-25-040663.txt : 20250317
<SEC-HEADER>0000950170-25-040663.hdr.sgml : 20250317
<ACCEPTANCE-DATETIME>20250317202530
ACCESSION NUMBER:		0000950170-25-040663
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20250313
FILED AS OF DATE:		20250317
DATE AS OF CHANGE:		20250317

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			JACOBS SOLUTIONS INC.
		CENTRAL INDEX KEY:			0000052988
		STANDARD INDUSTRIAL CLASSIFICATION:	HEAVY CONSTRUCTION OTHER THAN BUILDING CONST - CONTRACTORS [1600]
		ORGANIZATION NAME:           	05 Real Estate & Construction
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			0926

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-42176
		FILM NUMBER:		25746167

	BUSINESS ADDRESS:	
		STREET 1:		1999 BRYAN STREET, SUITE 3500
		CITY:			DALLAS
		STATE:			TX
		ZIP:			75201
		BUSINESS PHONE:		214-583-8500

	MAIL ADDRESS:	
		STREET 1:		1999 BRYAN STREET, SUITE 3500
		CITY:			DALLAS
		STATE:			TX
		ZIP:			75201

	FORMER NAME:	
		FORMER CONFORMED NAME:	JACOBS ENGINEERING GROUP INC /DE/
		DATE OF NAME CHANGE:	19920703

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			JACOBS ENGINEERING GROUP INC /DE/
		CENTRAL INDEX KEY:			0001963960
		STANDARD INDUSTRIAL CLASSIFICATION:	HEAVY CONSTRUCTION OTHER THAN BUILDING CONST - CONTRACTORS [1600]
		ORGANIZATION NAME:           	05 Real Estate & Construction

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-42176
		FILM NUMBER:		25746166

	BUSINESS ADDRESS:	
		STREET 1:		1999 BRYAN STREET
		STREET 2:		SUITE 1200
		CITY:			DALLAS
		STATE:			TX
		ZIP:			75201
		BUSINESS PHONE:		214-638-0145

	MAIL ADDRESS:	
		STREET 1:		1999 BRYAN STREET
		STREET 2:		SUITE 1200
		CITY:			DALLAS
		STATE:			TX
		ZIP:			75201

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			Amentum Holdings, Inc.
		CENTRAL INDEX KEY:			0002011286
		STANDARD INDUSTRIAL CLASSIFICATION:	SERVICES-BUSINESS SERVICES, NEC [7389]
		ORGANIZATION NAME:           	07 Trade & Services
		IRS NUMBER:				990622272
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1003

	BUSINESS ADDRESS:	
		STREET 1:		4800 WESTFIELDS BOULEVARD
		STREET 2:		SUITE 400
		CITY:			CHANTILLY
		STATE:			VA
		ZIP:			20151
		BUSINESS PHONE:		7035790410

	MAIL ADDRESS:	
		STREET 1:		4800 WESTFIELDS BOULEVARD
		STREET 2:		SUITE 400
		CITY:			CHANTILLY
		STATE:			VA
		ZIP:			20151

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	Amazon Holdco Inc.
		DATE OF NAME CHANGE:	20240208
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>ownership.xml
<DESCRIPTION>4
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<ownershipDocument>

    <schemaVersion>X0508</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2025-03-13</periodOfReport>

    <notSubjectToSection16>true</notSubjectToSection16>

    <issuer>
        <issuerCik>0002011286</issuerCik>
        <issuerName>Amentum Holdings, Inc.</issuerName>
        <issuerTradingSymbol>AMTM</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0000052988</rptOwnerCik>
            <rptOwnerName>JACOBS SOLUTIONS INC.</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>1999 BRYAN STREET, SUITE 3500</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>DALLAS</rptOwnerCity>
            <rptOwnerState>TX</rptOwnerState>
            <rptOwnerZipCode>75201</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>false</isDirector>
            <isOfficer>false</isOfficer>
            <isTenPercentOwner>true</isTenPercentOwner>
            <isOther>false</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001963960</rptOwnerCik>
            <rptOwnerName>JACOBS ENGINEERING GROUP INC /DE/</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>1999 BRYAN STREET, SUITE 3500</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>DALLAS</rptOwnerCity>
            <rptOwnerState>TX</rptOwnerState>
            <rptOwnerZipCode>75201</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>false</isDirector>
            <isOfficer>false</isOfficer>
            <isTenPercentOwner>true</isTenPercentOwner>
            <isOther>false</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <aff10b5One>false</aff10b5One>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2025-03-13</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>J</transactionCode>
                <equitySwapInvolved>false</equitySwapInvolved>
                <footnoteId id="F1"/>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>19464174</value>
                    <footnoteId id="F1"/>
                </transactionShares>
                <transactionPricePerShare>
                    <footnoteId id="F1"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>0</value>
                    <footnoteId id="F2"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See footnote</value>
                    <footnoteId id="F3"/>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">On March 13, 2025, Jacobs Engineering Group Inc. (&quot;JEG&quot;), a wholly-owned subsidiary of Jacobs Solutions Inc. (the &quot;Company&quot; or &quot;Jacobs&quot;), exchanged 19,464,174 shares of common stock, par value $0.01 per share, of Amentum Holdings, Inc. (the &quot;Amentum Common Stock&quot;) for aproximately 240 million Pounds in aggregate principal amount of term loans under its Amended and Restated Term Loan Agreement, dated as of February 6, 2023, by and among inter alia JEG, as borrower, Jacobs, as guarantor, the lenders party thereto and Bank of America, N.A., as amended. The exchanged portion of term loans have been retired. After giving effect to such exchange and retirement, Jacobs' aggregate outstanding borrowings decreased by approximately 240 million Pounds, or the equivalent of approximately $312 million based on an exchange rate of $1.2990 per 1 Pound.</footnote>
        <footnote id="F2">An additional 9,732,087 shares of Amentum Common Stock remain in escrow, subject to final determination of certain performance milestones in connection with a post-closing adjustment to the merger consideration provided in the transaction documents relating to the combination of Jacobs' Critical Mission Solutions and Cyber &amp; Intelligence businesses with Amentum Parent Holdings LLC on September 27, 2024. While such Amentum Common Stock remains in escrow, Jacobs does not beneficially own or have any pecuniary interest in such Amentum Common Stock. To the extent any such Amentum Common Stock is released to Jacobs, Jacobs will not have voting power over the Amentum Common Stock and Jacobs will distribute to Jacobs' shareholders, on a pro rata basis, any such shares received by it.</footnote>
        <footnote id="F3">The shares of Amentum Common Stock beneficially owned by Jacobs were owned directly by JEG.  Jacobs was an indirect beneficial owner of the retained securities.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>/s/ Justin Johnson, General Counsel, Executive Vice President &amp; Secretary</signatureName>
        <signatureDate>2024-03-13</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>/s/ Justin Johnson, Executive Vice President &amp; Secretary</signatureName>
        <signatureDate>2024-03-13</signatureDate>
    </ownerSignature>
</ownershipDocument>
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</SEC-DOCUMENT>
