Results of Operations and Financial Condition On August 10, 2026, Amentum Holdings, Inc. (“Amentum”) released its financial results for the third quarter ended July 3, 2026. A copy of the press release announcing the financial results as well as the schedule for a conference call and webcast on August 11, 2026 is furnished as Exhibit 99.1 to this Current Report on Form 8-K and incorporated herein by reference.

Results of Operations and Financial Condition On May 11, 2026, Amentum Holdings, Inc. (“Amentum”) released its financial results for the second quarter ended April 3, 2026. A copy of the press release announcing the financial results as well as the schedule for a conference call and webcast on May 12, 2026 is furnished as Exhibit 99.1 to this Current Report on Form 8-K and incorporated herein by reference.

Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant. The information in

Entry into a Material Definitive Agreement. Amended Credit Agreement On April 24, 2026, Amentum Holdings, Inc., a Delaware corporation (“Amentum”), entered into the First Amendment (the “First Amendment”), dated as of such date, among Amentum, Amentum Services, Inc., a Delaware corporation (“Amentum Services”), Amentum Technology, Inc., a Tennessee corporation (“Amentum Technology”), the other loan parties party thereto, the lenders party thereto, the issuing banks party thereto and JPMorgan…

Results of Operations and Financial Condition On February 9, 2026, Amentum Holdings, Inc. (“Amentum”) released its financial results for the first quarter ended January 2, 2026. A copy of the press release announcing the financial results as well as the schedule for a conference call and webcast on February 10, 2026 is furnished as Exhibit 99.1 to this Current Report on Form 8-K and incorporated herein by reference.

Results of Operations and Financial Condition On November 24, 2025, Amentum Holdings, Inc. (“Amentum”) released its financial results for the fourth quarter and full year ended October 3, 2025. A copy of the press release announcing the financial results as well as the schedule for a conference call and webcast on November 25, 2025 is furnished as Exhibit 99.1 to this Current Report on Form 8-K and incorporated herein by reference.

Results of Operations and Financial Condition On August 5, 2025, Amentum Holdings, Inc. (“Amentum”) released its financial results for the third quarter ended June 27, 2025. A copy of the press release announcing the financial results as well as the schedule for a conference call and webcast on August 6, 2025 is furnished as Exhibit 99.1 to this Current Report on Form 8-K and incorporated herein by reference.

Results of Operations and Financial Condition On May 6, 2025, Amentum Holdings, Inc. (“Amentum”) released its financial results for the second quarter ended March 28, 2025. A copy of the press release announcing the financial results as well as the schedule for a conference call and webcast on May 7, 2025 is furnished as Exhibit 99.1 to this Current Report on Form 8-K and incorporated herein by reference.

Results of Operations and Financial Condition On February 4, 2025, Amentum Holdings, Inc. (“Amentum”) released its financial results for the first quarter ended December 27, 2024. A copy of the press release announcing the financial results as well as the schedule for a conference call and webcast on February 5, 2025 is furnished as Exhibit 99.1 to this Current Report on Form 8-K and incorporated herein by reference.

CEO — John Heller: The filing discloses the approval of a compensatory equity award to the CEO, not a change in management or departure.

Results of Operations and Financial Condition On December 16, 2024, Amentum Holdings, Inc. (“Amentum”) released its financial results for the fourth quarter and full year ended September 27, 2024. A copy of the press release announcing the financial results as well as the schedule for a conference call and webcast on December 17, 2024 is furnished as Exhibit 99.1 to this Current Report on Form 8-K and incorporated herein by reference.

The filing describes the approval of a severance plan and new employment/compensation agreements, which are administrative arrangements rather than an actual departure or change in personnel.

Changes in Control of Registrant. The information contained in

Entry into a Material Definitive Agreement. Credit Agreement On September 27, 2024, Amentum entered into the Credit Agreement dated as of such date (the “Credit Agreement”), by and among Amentum, the borrowing subsidiaries from time to time party thereto, the lenders from time to time party thereto and JPMorgan Chase Bank, N.A., as administrative agent, pursuant to which Amentum obtained a $3.75 billion term facility and a $850 million revolving facility. The Credit Agreement was originally e…

Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant. The information set forth in

The excerpt describes the adoption of stock incentive plans, ESPP, and indemnification agreements in connection with a corporate transaction, rather than a specific change in director or officer status.

Termination of a Material Definitive Agreement. In connection with the RMT Transaction, on September 27, 2024, Amentum repaid all outstanding borrowings and other amounts under the First Lien Credit Agreement dated as of January 31, 2020, as amended (the “Prior Amentum First Lien Credit Agreement”), by and among Amentum Parent, Amentum Holdings LLC, Amentum Government Services Holdings LLC, Amentum N&E Holdings LLC, the borrowing subsidiaries from time to time party thereto, the lenders from…

Completion of Acquisition or Disposition of Assets. The information contained in

Entry into a Material Definitive Agreement. On September 27, 2024, Amentum Parent Holdings LLC (“Amentum”) and Jacobs Solutions Inc. (“Jacobs”) announced that they had consummated the previously announced combination of Amentum with Jacobs’ Critical Missions Solutions and Cyber & Intelligence government services businesses (collectively, the “SpinCo Business”) through a Reverse Morris Trust transaction. In accordance with the terms and conditions of the Agreement and Plan of Merger, dated as…

COO — Stephen A. Arnette: The filing discloses the appointment of a new Chief Operating Officer, which is a significant management addition but not a departure.

of Form 8-K, “Regulation FD Disclosure.” This information shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or incorporated by reference in any filing under the Securities Act of 1933, as amended, or the Exchange Act, except as shall be expressly set forth by specific reference in such a filing. The furnishing of this information will not be deemed an admission as to the materiality of any information contained here…