AMTM

SEC source: 0002011286-25-000111 · wk-form4_1744317601.xml · derivative · entry 1

Thompson Christopher M.T. · CIK 0001483410 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 11,564

Underlying: Common Stock · 11,564 shares

Expires not disclosed

F1 · derivative.exercise_price: Each restricted stock unit represents a contingent right to receive one share of AMTM common stock.

F2 · derivative.exercise_date: The restricted stock units shall vest on the date of the next annual meeting of stockholders of the Issuer.

F2 · derivative.expiration_date: The restricted stock units shall vest on the date of the next annual meeting of stockholders of the Issuer.

SEC source: 0002011286-25-000112 · wk-form4_1744317611.xml · derivative · entry 1

Rowland Sandra E. · CIK 0001629360 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 11,564

Underlying: Common Stock · 11,564 shares

Expires not disclosed

F1 · derivative.exercise_price: Each restricted stock unit represents a contingent right to receive one share of AMTM common stock.

F2 · derivative.exercise_date: The restricted stock units shall vest on the date of the next annual meeting of stockholders of the Issuer.

F2 · derivative.expiration_date: The restricted stock units shall vest on the date of the next annual meeting of stockholders of the Issuer.

SEC source: 0000950157-25-000298 · form4.xml · nonDerivative · entry 1

Amentum Joint Venture GP LLC · CIK 0002037401 · Director

Amentum Joint Venture LP · CIK 0002037182 · Director

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: No plan indicated

Ownership: Indirect · By Amentum Joint Venture LP

Disclosed balance after: 2,433,022

F2 · kind: Solely for purposes of Section 16 of the Securities Exchange Act of 1934, as amended (the "Exchange Act"), the Reporting Persons may be deemed to be directors-by-deputization by virtue of the Reporting Persons' contractual right to nominate directors to the board of directors (the "Board") of the Issuer pursuant to the Stockholders' Agreement by and between Amentum JV and the Issuer, dated September 27, 2024, entered into in connection with the RMT Transaction. For purposes of the exemption under Rule 16b-3 promulgated under the Exchange Act, the Board approved the acquisition of any direct or indirect pecuniary interest of the shares of the Issuer reported herein by the Reporting Persons.

F1 · price: This Form 4 is filed jointly by (i) Amentum Joint Venture GP LLC and (ii) Amentum Joint Venture LP ("Amentum JV"). Amentum Joint Venture GP LLC is the general partner of Amentum JV and may be deemed to have indirect voting and investment control over the shares held by Amentum JV. The shares of the Issuer reported in this Form 4 are owned directly by Amentum JV as a result of a Reverse Morris Trust transaction (the "RMT Transaction"), with the Issuer surviving and being renamed Amentum Holdings, Inc., pursuant to the merger agreement and separation and distribution agreement, each dated as of November 20, 2023, among, in each case, Jacobs Solutions, Inc., the Issuer, Amentum Parent Holdings LLC and Amentum JV (as amended).

F1 · balance_after: This Form 4 is filed jointly by (i) Amentum Joint Venture GP LLC and (ii) Amentum Joint Venture LP ("Amentum JV"). Amentum Joint Venture GP LLC is the general partner of Amentum JV and may be deemed to have indirect voting and investment control over the shares held by Amentum JV. The shares of the Issuer reported in this Form 4 are owned directly by Amentum JV as a result of a Reverse Morris Trust transaction (the "RMT Transaction"), with the Issuer surviving and being renamed Amentum Holdings, Inc., pursuant to the merger agreement and separation and distribution agreement, each dated as of November 20, 2023, among, in each case, Jacobs Solutions, Inc., the Issuer, Amentum Parent Holdings LLC and Amentum JV (as amended).

F1 · ownership.nature: This Form 4 is filed jointly by (i) Amentum Joint Venture GP LLC and (ii) Amentum Joint Venture LP ("Amentum JV"). Amentum Joint Venture GP LLC is the general partner of Amentum JV and may be deemed to have indirect voting and investment control over the shares held by Amentum JV. The shares of the Issuer reported in this Form 4 are owned directly by Amentum JV as a result of a Reverse Morris Trust transaction (the "RMT Transaction"), with the Issuer surviving and being renamed Amentum Holdings, Inc., pursuant to the merger agreement and separation and distribution agreement, each dated as of November 20, 2023, among, in each case, Jacobs Solutions, Inc., the Issuer, Amentum Parent Holdings LLC and Amentum JV (as amended).

F2 · ownership.nature: Solely for purposes of Section 16 of the Securities Exchange Act of 1934, as amended (the "Exchange Act"), the Reporting Persons may be deemed to be directors-by-deputization by virtue of the Reporting Persons' contractual right to nominate directors to the board of directors (the "Board") of the Issuer pursuant to the Stockholders' Agreement by and between Amentum JV and the Issuer, dated September 27, 2024, entered into in connection with the RMT Transaction. For purposes of the exemption under Rule 16b-3 promulgated under the Exchange Act, the Board approved the acquisition of any direct or indirect pecuniary interest of the shares of the Issuer reported herein by the Reporting Persons.

SEC source: 0002011286-25-000096 · wk-form4_1742416634.xml · derivative · entry 1

St. Mary Michele T · CIK 0002057553 · Chief Legal Officer & GC

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 21,242

Underlying: Common Stock · 21,242 shares

Expires not disclosed

F1 · derivative.exercise_price: Each restricted stock unit represents a contingent right to receive one share of AMTM common stock.

F2 · derivative.exercise_date: One-third of the restricted stock units shall vest on each of the first, second and third anniversaries of February 17, 2025.

F2 · derivative.expiration_date: One-third of the restricted stock units shall vest on each of the first, second and third anniversaries of February 17, 2025.

SEC source: 0000950170-25-040663 · ownership.xml · nonDerivative · entry 1

JACOBS SOLUTIONS INC. · CIK 0000052988 · 10% owner

JACOBS ENGINEERING GROUP INC /DE/ · CIK 0001963960 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: No plan indicated

Ownership: Indirect · See footnote

Disclosed balance after: 0

F1 · kind: 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.

F1 · shares: 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.

F1 · price: 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.

F2 · balance_after: 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.

F3 · ownership.nature: 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.

SEC source: 0002011286-25-000092 · wk-form4_1741383543.xml · derivative · entry 2

IRELAND SUSAN LESLIE · CIK 0001718953 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 3,447 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F2 · derivative.exercise_price: Each restricted stock unit represents a contingent right to receive one share of AMTM common stock.

F1 · kind: Represents distribution of AMTM common stock upon vesting of restricted stock units.

F3 · derivative.exercise_date: The restricted stock units awarded vested on March 5, 2025.

F3 · derivative.expiration_date: The restricted stock units awarded vested on March 5, 2025.

SEC source: 0002011286-25-000092 · wk-form4_1741383543.xml · nonDerivative · entry 1

IRELAND SUSAN LESLIE · CIK 0001718953 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 3,447

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · price: Represents distribution of AMTM common stock upon vesting of restricted stock units.

SEC source: 0002011286-25-000091 · wk-form4_1741383534.xml · derivative · entry 3

Vollmer John C. · CIK 0001723342 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 3,447 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F3 · derivative.exercise_price: Each restricted stock unit represents a contingent right to receive one share of AMTM common stock.

F2 · kind: Represents distribution of AMTM common stock upon vesting of restricted stock units.

F4 · derivative.exercise_date: The restricted stock units awarded vested on March 5, 2025.

F4 · derivative.expiration_date: The restricted stock units awarded vested on March 5, 2025.

SEC source: 0002011286-25-000091 · wk-form4_1741383534.xml · nonDerivative · entry 2

Vollmer John C. · CIK 0001723342 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 394,788

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F2 · price: Represents distribution of AMTM common stock upon vesting of restricted stock units.

SEC source: 0002011286-25-000088 · wk-form4_1741383513.xml · derivative · entry 2

Rowland Sandra E. · CIK 0001629360 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 3,447 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F2 · derivative.exercise_price: Each restricted stock unit represents a contingent right to receive one share of AMTM common stock.

F1 · kind: Represents distribution of AMTM common stock upon vesting of restricted stock units.

F3 · derivative.exercise_date: The restricted stock units awarded vested on March 5, 2025.

F3 · derivative.expiration_date: The restricted stock units awarded vested on March 5, 2025.

SEC source: 0002011286-25-000088 · wk-form4_1741383513.xml · nonDerivative · entry 1

Rowland Sandra E. · CIK 0001629360 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 3,447

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · price: Represents distribution of AMTM common stock upon vesting of restricted stock units.

SEC source: 0002011286-25-000089 · wk-form4_1741383523.xml · derivative · entry 3

Brooks Vincent K · CIK 0001809046 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 3,447 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F3 · derivative.exercise_price: Each restricted stock unit represents a contingent right to receive one share of AMTM common stock.

F2 · kind: Represents distribution of AMTM common stock upon vesting of restricted stock units.

F4 · derivative.exercise_date: The restricted stock units awarded vested on March 5, 2025.

F4 · derivative.expiration_date: The restricted stock units awarded vested on March 5, 2025.

SEC source: 0002011286-25-000089 · wk-form4_1741383523.xml · nonDerivative · entry 2

Brooks Vincent K · CIK 0001809046 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 10,413

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F2 · price: Represents distribution of AMTM common stock upon vesting of restricted stock units.

SEC source: 0002011286-25-000087 · wk-form4_1741383503.xml · derivative · entry 3

EBERHART RALPH E · CIK 0001409312 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 3,447 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F3 · derivative.exercise_price: Each restricted stock unit represents a contingent right to receive one share of AMTM common stock.

F2 · kind: Represents distribution of AMTM common stock upon vesting of restricted stock units.

F4 · derivative.exercise_date: The restricted stock units awarded vested on March 5, 2025.

F4 · derivative.expiration_date: The restricted stock units awarded vested on March 5, 2025.

SEC source: 0002011286-25-000087 · wk-form4_1741383503.xml · nonDerivative · entry 2

EBERHART RALPH E · CIK 0001409312 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 29,886

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F2 · price: Represents distribution of AMTM common stock upon vesting of restricted stock units.

SEC source: 0002011286-25-000070 · wk-form4_1741210513.xml · derivative · entry 7

Arnette Stephen A · CIK 0001919492 · Chief Operating Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 521 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F4 · derivative.exercise_price: Each restricted stock unit represents a contingent right to receive one share of AMTM common stock.

F2 · kind: Represents distribution of AMTM common stock upon vesting of restricted stock units.

F6 · derivative.exercise_date: The restricted stock units awarded vested on March 4, 2025.

F6 · derivative.expiration_date: The restricted stock units awarded vested on March 4, 2025.

SEC source: 0002011286-25-000070 · wk-form4_1741210513.xml · nonDerivative · entry 5

Arnette Stephen A · CIK 0001919492 · Chief Operating Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 22,020

F3 · shares: Represents number of shares of AMTM common stock tendered for tax withholding upon vesting of restricted stock units.

SEC source: 0002011286-25-000070 · wk-form4_1741210513.xml · nonDerivative · entry 4

Arnette Stephen A · CIK 0001919492 · Chief Operating Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 22,172

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F2 · price: Represents distribution of AMTM common stock upon vesting of restricted stock units.

SEC source: 0002011286-25-000070 · wk-form4_1741210513.xml · derivative · entry 6

Arnette Stephen A · CIK 0001919492 · Chief Operating Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 2,808

Underlying: Common Stock · 1,230 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F4 · derivative.exercise_price: Each restricted stock unit represents a contingent right to receive one share of AMTM common stock.

F2 · kind: Represents distribution of AMTM common stock upon vesting of restricted stock units.

F5 · derivative.exercise_date: The restricted stock units awarded vested on March 3, 2025.

F5 · derivative.expiration_date: The restricted stock units awarded vested on March 3, 2025.

SEC source: 0002011286-25-000070 · wk-form4_1741210513.xml · nonDerivative · entry 3

Arnette Stephen A · CIK 0001919492 · Chief Operating Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 21,651

F3 · shares: Represents number of shares of AMTM common stock tendered for tax withholding upon vesting of restricted stock units.

SEC source: 0002011286-25-000070 · wk-form4_1741210513.xml · nonDerivative · entry 2

Arnette Stephen A · CIK 0001919492 · Chief Operating Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 22,016

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F2 · price: Represents distribution of AMTM common stock upon vesting of restricted stock units.

SEC source: 0002011286-25-000064 · wk-form4_1740087154.xml · nonDerivative · entry 1

Loughran Barbara · CIK 0001778333 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 4,600

F1 · price: The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $20.81 to $21.48, inclusive. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the ranges set forth herein.

SEC source: 0002011286-25-000062 · wk-form4_1739575076.xml · nonDerivative · entry 2

DEMETRIOU STEVEN J. · CIK 0001173003 · Director · Executive Chair

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 620,893

F2 · price: The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $20.60 to $21.08, inclusive. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the ranges set forth herein.

SEC source: 0002011286-25-000042 · wk-form4_1738272281.xml · derivative · entry 3

Heller John E. · CIK 0001552715 · Director · Chief Executive Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 155,938

Underlying: Common Stock · 155,938 shares

Expires not disclosed

F3 · derivative.exercise_price: Each restricted stock unit represents a contingent right to receive one share of AMTM common stock.

F4 · derivative.exercise_date: One-third of the restricted stock units shall vest on each of the first, second and third anniversaries of the date of grant.

F4 · derivative.expiration_date: One-third of the restricted stock units shall vest on each of the first, second and third anniversaries of the date of grant.

SEC source: 0002011286-25-000042 · wk-form4_1738272281.xml · derivative · entry 2

Heller John E. · CIK 0001552715 · Director · Chief Executive Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,373,955

Underlying: Common Stock · 1,373,955 shares

Expires 2029-01-28

F2 · derivative.exercise_date: One-third of the stock options shall vest on each of the first, second and third anniversaries of the date of grant.

SEC source: 0002011286-24-000074 · wk-form4_1734994527.xml · derivative · entry 1

Mullen Sean Thomas · CIK 0002034388 · Chief Growth Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 9,298

Underlying: Common Stock · 9,298 shares

Expires not disclosed

F1 · derivative.exercise_price: Each restricted stock unit represents a contingent right to receive one share of AMTM common stock.

F2 · derivative.exercise_date: The restricted stock units shall vest on December 17, 2025.

F2 · derivative.expiration_date: The restricted stock units shall vest on December 17, 2025.

SEC source: 0000950157-24-001691 · form4.xml · nonDerivative · entry 1

Amentum Joint Venture GP LLC · CIK 0002037401 · Director · 10% owner

Amentum Joint Venture LP · CIK 0002037182 · Director · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: No plan indicated

Ownership: Indirect · By Amentum Joint Venture LP

Disclosed balance after: 0

F1 · kind: This Form 4 is filed jointly by (i) Amentum Joint Venture GP LLC and (ii) Amentum Joint Venture LP ("Amentum JV"). Amentum Joint Venture GP LLC is the general partner of Amentum JV and may be deemed to have indirect voting and investment control over the shares held by Amentum JV. The shares of the Issuer reported as disposed in this Form 4 were owned directly by Amentum JV as a result of a Reverse Morris Trust transaction (the "RMT Transaction"), with the Issuer surviving and being renamed Amentum Holdings, Inc., pursuant to the merger agreement and separation and distribution agreement, each dated as of November 20, 2023, among, in each case, Jacobs Solutions, Inc., the Issuer, Amentum Parent Holdings LLC and Amentum JV (as amended). The purpose of this Form 4 is to report that the Reporting Persons no longer beneficially own any shares of the Issuer.

F2 · price: On December 17, 2024, Amentum JV made pro rata distributions-in-kind of all of the shares of the Issuer held by Amentum JV to each of its limited partners in accordance with the limited partnership agreement of Amentum JV. As a result, Amentum JV no longer holds, and each of the Reporting Persons no longer beneficially owns, any shares of the Issuer.

F1 · balance_after: This Form 4 is filed jointly by (i) Amentum Joint Venture GP LLC and (ii) Amentum Joint Venture LP ("Amentum JV"). Amentum Joint Venture GP LLC is the general partner of Amentum JV and may be deemed to have indirect voting and investment control over the shares held by Amentum JV. The shares of the Issuer reported as disposed in this Form 4 were owned directly by Amentum JV as a result of a Reverse Morris Trust transaction (the "RMT Transaction"), with the Issuer surviving and being renamed Amentum Holdings, Inc., pursuant to the merger agreement and separation and distribution agreement, each dated as of November 20, 2023, among, in each case, Jacobs Solutions, Inc., the Issuer, Amentum Parent Holdings LLC and Amentum JV (as amended). The purpose of this Form 4 is to report that the Reporting Persons no longer beneficially own any shares of the Issuer.

F1 · ownership.nature: This Form 4 is filed jointly by (i) Amentum Joint Venture GP LLC and (ii) Amentum Joint Venture LP ("Amentum JV"). Amentum Joint Venture GP LLC is the general partner of Amentum JV and may be deemed to have indirect voting and investment control over the shares held by Amentum JV. The shares of the Issuer reported as disposed in this Form 4 were owned directly by Amentum JV as a result of a Reverse Morris Trust transaction (the "RMT Transaction"), with the Issuer surviving and being renamed Amentum Holdings, Inc., pursuant to the merger agreement and separation and distribution agreement, each dated as of November 20, 2023, among, in each case, Jacobs Solutions, Inc., the Issuer, Amentum Parent Holdings LLC and Amentum JV (as amended). The purpose of this Form 4 is to report that the Reporting Persons no longer beneficially own any shares of the Issuer.

F2 · ownership.nature: On December 17, 2024, Amentum JV made pro rata distributions-in-kind of all of the shares of the Issuer held by Amentum JV to each of its limited partners in accordance with the limited partnership agreement of Amentum JV. As a result, Amentum JV no longer holds, and each of the Reporting Persons no longer beneficially owns, any shares of the Issuer.

SEC source: 0001493152-24-052280 · ownership.xml · nonDerivative · entry 1

GOLDBERG ALAN E · CIK 0001077430 · Director · 10% owner

10b5-1 filing: No plan indicated

Ownership: Indirect · By LG Amentum Holdings LP

Disclosed balance after: 43,893,904

F1 · kind: Represents securities received in a pro-rata distribution in-kind by Amentum Joint Venture LP to its partners for no consideration.

F1 · price: Represents securities received in a pro-rata distribution in-kind by Amentum Joint Venture LP to its partners for no consideration.

SEC source: 0002011286-25-000042 · wk-form4_1738272281.xml · nonDerivative · entry 1

Heller John E. · CIK 0001552715 · Director · Chief Executive Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 91,794

F1 · kind: Represents securities received in a pro-rata distribution in-kind by Amentum Joint Venture LP to its partners for no consideration at the time of the transaction.

F1 · price: Represents securities received in a pro-rata distribution in-kind by Amentum Joint Venture LP to its partners for no consideration at the time of the transaction.

SEC source: 0002011286-25-000091 · wk-form4_1741383534.xml · nonDerivative · entry 1

Vollmer John C. · CIK 0001723342 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 391,341

F1 · kind: Represents securities received in a pro-rata distribution in-kind by Amentum Joint Venture LP to its partners for no consideration at the time of the transaction.

F1 · price: Represents securities received in a pro-rata distribution in-kind by Amentum Joint Venture LP to its partners for no consideration at the time of the transaction.

SEC source: 0002011286-24-000048 · wk-form4_1733778368.xml · derivative · entry 1

Burton Darren · CIK 0002044904 · Chief People Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 8,165

Underlying: Common Stock · 8,165 shares

Expires not disclosed

F1 · derivative.exercise_price: Each restricted stock unit represents a contingent right to receive one share of AMTM common stock.

F2 · derivative.exercise_date: One-third of the restricted stock units shall vest and be delivered on each of the first, second and third anniversaries of the date of grant.

F2 · derivative.expiration_date: One-third of the restricted stock units shall vest and be delivered on each of the first, second and third anniversaries of the date of grant.

SEC source: 0002011286-24-000030 · wk-form4_1731100267.xml · derivative · entry 1

DEMETRIOU STEVEN J. · CIK 0001173003 · Director · Executive Chair

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 90,727

Underlying: Common Stock · 90,727 shares

Expires not disclosed

F1 · derivative.exercise_price: Each restricted stock unit represents a contingent right to receive one share of AMTM common stock.

F2 · derivative.exercise_date: The restricted stock units shall vest on the first anniversary of the date of grant.

F2 · derivative.expiration_date: The restricted stock units shall vest on the first anniversary of the date of grant.

SEC source: 0002011286-24-000024 · wk-form4_1731100198.xml · derivative · entry 2

Bruning Jill L · CIK 0002037037 · Chief Technology Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 14,516

Underlying: Common Stock · 14,516 shares

Expires not disclosed

F1 · derivative.exercise_price: Each restricted stock unit represents a contingent right to receive one share of AMTM common stock.

F3 · derivative.exercise_date: One-third of the restricted stock units shall vest on each of the first, second and third anniversaries of the date of grant.

F3 · derivative.expiration_date: One-third of the restricted stock units shall vest on each of the first, second and third anniversaries of the date of grant.

SEC source: 0002011286-24-000024 · wk-form4_1731100198.xml · derivative · entry 1

Bruning Jill L · CIK 0002037037 · Chief Technology Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 18,145

Underlying: Common Stock · 18,145 shares

Expires not disclosed

F1 · derivative.exercise_price: Each restricted stock unit represents a contingent right to receive one share of AMTM common stock.

F2 · derivative.exercise_date: One-half of the restricted stock units shall vest on the 18th month and three-year anniversaries of the date of grant.

F2 · derivative.expiration_date: One-half of the restricted stock units shall vest on the 18th month and three-year anniversaries of the date of grant.

SEC source: 0002011286-24-000031 · wk-form4_1731100277.xml · derivative · entry 2

Mullen Sean Thomas · CIK 0002034388 · Chief Growth Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 14,516

Underlying: Common Stock · 14,516 shares

Expires not disclosed

F1 · derivative.exercise_price: Each restricted stock unit represents a contingent right to receive one share of AMTM common stock.

F3 · derivative.exercise_date: One-third of the restricted stock units shall vest on each of the first, second and third anniversaries of the date of grant.

F3 · derivative.expiration_date: One-third of the restricted stock units shall vest on each of the first, second and third anniversaries of the date of grant.

SEC source: 0002011286-24-000031 · wk-form4_1731100277.xml · derivative · entry 1

Mullen Sean Thomas · CIK 0002034388 · Chief Growth Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 18,145

Underlying: Common Stock · 18,145 shares

Expires not disclosed

F1 · derivative.exercise_price: Each restricted stock unit represents a contingent right to receive one share of AMTM common stock.

F2 · derivative.exercise_date: One-half of the restricted stock units shall vest on the 18th month and three-year anniversaries of the date of grant.

F2 · derivative.expiration_date: One-half of the restricted stock units shall vest on the 18th month and three-year anniversaries of the date of grant.

SEC source: 0002011286-24-000032 · wk-form4_1731100601.xml · derivative · entry 1

Young Stuart Ira · CIK 0002034552 · Chief Legal Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 3,629

Underlying: Common Stock · 3,629 shares

Expires not disclosed

F1 · derivative.exercise_price: Each restricted stock unit represents a contingent right to receive one share of AMTM common stock.

F2 · derivative.exercise_date: Grant of RSUs will vest after 1 year whether Mr. Young is employed at Amentum or not, as long as Mr. Young does not voluntarily terminate and/or is not terminated for Cause within the 1-year vesting period.

F2 · derivative.expiration_date: Grant of RSUs will vest after 1 year whether Mr. Young is employed at Amentum or not, as long as Mr. Young does not voluntarily terminate and/or is not terminated for Cause within the 1-year vesting period.

SEC source: 0002011286-24-000034 · wk-form4_1731100623.xml · derivative · entry 2

Heller John E. · CIK 0001552715 · Director · Chief Executive Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 118,853

Underlying: Common Stock · 118,853 shares

Expires not disclosed

F1 · derivative.exercise_price: Each restricted stock unit represents a contingent right to receive one share of AMTM common stock.

F3 · derivative.exercise_date: One-third of the restricted stock units shall vest on each of the first, second and third anniversaries of the date of grant.

F3 · derivative.expiration_date: One-third of the restricted stock units shall vest on each of the first, second and third anniversaries of the date of grant.

SEC source: 0002011286-24-000034 · wk-form4_1731100623.xml · derivative · entry 1

Heller John E. · CIK 0001552715 · Director · Chief Executive Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 36,291

Underlying: Common Stock · 36,291 shares

Expires not disclosed

F1 · derivative.exercise_price: Each restricted stock unit represents a contingent right to receive one share of AMTM common stock.

F2 · derivative.exercise_date: One-half of the restricted stock units shall vest on the 18th month and three-year anniversaries of the date of grant.

F2 · derivative.expiration_date: One-half of the restricted stock units shall vest on the 18th month and three-year anniversaries of the date of grant.

SEC source: 0002011286-24-000033 · wk-form4_1731100612.xml · derivative · entry 1

Loughran Barbara · CIK 0001778333 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 3,447

Underlying: Common Stock · 3,447 shares

Expires not disclosed

F1 · derivative.exercise_price: Each restricted stock unit represents a contingent right to receive one share of AMTM common stock.

F2 · derivative.exercise_date: The restricted stock units shall vest on the date of the next annual meeting of stockholders of the Issuer.

F2 · derivative.expiration_date: The restricted stock units shall vest on the date of the next annual meeting of stockholders of the Issuer.

SEC source: 0002011286-24-000029 · wk-form4_1731100256.xml · derivative · entry 1

Thompson Christopher M.T. · CIK 0001483410 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 3,447

Underlying: Common Stock · 3,447 shares

Expires not disclosed

F1 · derivative.exercise_price: Each restricted stock unit represents a contingent right to receive one share of AMTM common stock.

F2 · derivative.exercise_date: The restricted stock units shall vest on the date of the next annual meeting of stockholders of the Issuer.

F2 · derivative.expiration_date: The restricted stock units shall vest on the date of the next annual meeting of stockholders of the Issuer.

SEC source: 0002011286-24-000028 · wk-form4_1731100245.xml · derivative · entry 1

EBERHART RALPH E · CIK 0001409312 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 3,447

Underlying: Common Stock · 3,447 shares

Expires not disclosed

F1 · derivative.exercise_price: Each restricted stock unit represents a contingent right to receive one share of AMTM common stock.

F2 · derivative.exercise_date: The restricted stock units shall vest on the date of the next annual meeting of stockholders of the Issuer.

F2 · derivative.expiration_date: The restricted stock units shall vest on the date of the next annual meeting of stockholders of the Issuer.

SEC source: 0002011286-24-000027 · wk-form4_1731100235.xml · derivative · entry 1

IRELAND SUSAN LESLIE · CIK 0001718953 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 3,447

Underlying: Common Stock · 3,447 shares

Expires not disclosed

F1 · derivative.exercise_price: Each restricted stock unit represents a contingent right to receive one share of AMTM common stock.

F2 · derivative.exercise_date: The restricted stock units shall vest on the date of the next annual meeting of stockholders of the Issuer.

F2 · derivative.expiration_date: The restricted stock units shall vest on the date of the next annual meeting of stockholders of the Issuer.

SEC source: 0002011286-24-000026 · wk-form4_1731100224.xml · derivative · entry 1

Brooks Vincent K · CIK 0001809046 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 3,447

Underlying: Common Stock · 3,447 shares

Expires not disclosed

F1 · derivative.exercise_price: Each restricted stock unit represents a contingent right to receive one share of AMTM common stock.

F2 · derivative.exercise_date: The restricted stock units shall vest on the date of the next annual meeting of stockholders of the Issuer.

F2 · derivative.expiration_date: The restricted stock units shall vest on the date of the next annual meeting of stockholders of the Issuer.

SEC source: 0002011286-24-000025 · wk-form4_1731100211.xml · derivative · entry 2

Arnette Stephen A · CIK 0001919492 · Chief Operating Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 38,105

Underlying: Common Stock · 38,105 shares

Expires not disclosed

F1 · derivative.exercise_price: Each restricted stock unit represents a contingent right to receive one share of AMTM common stock.

F3 · derivative.exercise_date: One-third of the restricted stock units shall vest on each of the first, second and third anniversaries of the date of grant.

F3 · derivative.expiration_date: One-third of the restricted stock units shall vest on each of the first, second and third anniversaries of the date of grant.

SEC source: 0002011286-24-000025 · wk-form4_1731100211.xml · derivative · entry 1

Arnette Stephen A · CIK 0001919492 · Chief Operating Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 27,218

Underlying: Common Stock · 27,218 shares

Expires not disclosed

F1 · derivative.exercise_price: Each restricted stock unit represents a contingent right to receive one share of AMTM common stock.

F2 · derivative.exercise_date: One-half of the restricted stock units shall vest on the 18th month and three-year anniversaries of the date of grant.

F2 · derivative.expiration_date: One-half of the restricted stock units shall vest on the 18th month and three-year anniversaries of the date of grant.

SEC source: 0002011286-24-000022 · wk-form4_1731100177.xml · derivative · entry 2

Johnson Travis Barton · CIK 0001795038 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 36,291

Underlying: Common Stock · 36,291 shares

Expires not disclosed

F1 · derivative.exercise_price: Each restricted stock unit represents a contingent right to receive one share of AMTM common stock.

F3 · derivative.exercise_date: One-third of the restricted stock units shall vest on each of the first, second and third anniversaries of the date of grant.

F3 · derivative.expiration_date: One-third of the restricted stock units shall vest on each of the first, second and third anniversaries of the date of grant.

SEC source: 0002011286-24-000022 · wk-form4_1731100177.xml · derivative · entry 1

Johnson Travis Barton · CIK 0001795038 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 27,218

Underlying: Common Stock · 27,218 shares

Expires not disclosed

F1 · derivative.exercise_price: Each restricted stock unit represents a contingent right to receive one share of AMTM common stock.

F2 · derivative.exercise_date: One-half of the restricted stock units shall vest on the 18th month and three-year anniversaries of the date of grant.

F2 · derivative.expiration_date: One-half of the restricted stock units shall vest on the 18th month and three-year anniversaries of the date of grant.

SEC source: 0002011286-24-000023 · wk-form4_1731100188.xml · derivative · entry 1

Vollmer John C. · CIK 0001723342 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 3,447

Underlying: Common Stock · 3,447 shares

Expires not disclosed

F1 · derivative.exercise_price: Each restricted stock unit represents a contingent right to receive one share of AMTM common stock.

F2 · derivative.exercise_date: The restricted stock units shall vest on the date of the next annual meeting of stockholders of the Issuer.

F2 · derivative.expiration_date: The restricted stock units shall vest on the date of the next annual meeting of stockholders of the Issuer.

SEC source: 0002011286-24-000021 · wk-form4_1731100166.xml · derivative · entry 1

Rowland Sandra E. · CIK 0001629360 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 3,447

Underlying: Common Stock · 3,447 shares

Expires not disclosed

F1 · derivative.exercise_price: Each restricted stock unit represents a contingent right to receive one share of AMTM common stock.

F2 · derivative.exercise_date: The restricted stock units shall vest on the date of the next annual meeting of stockholders of the Issuer.

F2 · derivative.expiration_date: The restricted stock units shall vest on the date of the next annual meeting of stockholders of the Issuer.