Sec Form 4 Filing - JACOBS SOLUTIONS INC. @ Amentum Holdings, Inc. - 2025-03-13

FORM 4 Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person JACOBS SOLUTIONS INC. 2. Issuer Name and Ticker or Trading Symbol Amentum Holdings, Inc. [ AMTM] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director X __ 10% Owner _____ Officer (give title below) _____ Other (specify below) (Last) (First) (Middle) 1999 BRYAN STREET, SUITE 3500 3. Date of Earliest Transaction (MM/DD/YY) 03/13/2025 (Street) DALLAS, TX75201 4. If Amendment, Date Original Filed (MM/DD/YY) 6. Individual or Joint/Group Filing (Check Applicable Line) _____ Form filed by One Reporting Person __ X __ Form filed by More than One Reporting Person (City) (State) (Zip)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned 1.Title of Security (Instr. 3) 2. Transaction Date (MM/DD/YY) 2A. Deemed Execution Date, if any (MM/DD/YY) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4) Code V Amount (A) or (D) Price Common Stock 03/13/2025 J( 1 ) 19,464,174 ( 1 ) D 0 ( 2 ) I See footnote ( 3 )

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned ( e.g. , puts, calls, warrants, options, convertible securities) 1. Title of Derivative Security (Instr. 3) 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (MM/DD/YY) 3A. Deemed Execution Date, if any (MM/DD/YY) 4. Transaction Code (Instr. 8) 5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4, and 5) 6. Date Exercisable and Expiration Date (MM/DD/YY) 7. Title and Amount of Underlying Securities (Instr. 3 and 4) 8. Price of Derivative Security (Instr. 5) 9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4) Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other JACOBS SOLUTIONS INC. 1999 BRYAN STREET, SUITE 3500 DALLAS, TX75201 X JACOBS ENGINEERING GROUP INC /DE/ 1999 BRYAN STREET, SUITE 3500 DALLAS, TX75201 X Signatures /s/ Justin Johnson, General Counsel, Executive Vice President & Secretary 03/13/2024 Signature of Reporting Person Date /s/ Justin Johnson, Executive Vice President & Secretary 03/13/2024 Signature of Reporting Person Date

Explanation of Responses:

( 1 )On March 13, 2025, Jacobs Engineering Group Inc. ("JEG"), a wholly-owned subsidiary of Jacobs Solutions Inc. (the "Company" or "Jacobs"), exchanged 19,464,174 shares of common stock, par value $0.01 per share, of Amentum Holdings, Inc. (the "Amentum Common Stock") 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. ( 2 )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 & 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. ( 3 )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.

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.

* If the form is filed by more than one reporting person, see Instruction 4(b)(v).

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