Amentum Holdings, Inc.

Q: Jul 3 2026

Q: Apr 3 2026

Q: Jan 2 2026

FY: Oct 3 2025

Q: Jun 27 2025

Q: Mar 28 2025

Q: Dec 27 2024

FY: Sep 27 2024

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers: Compensatory Arrangements of Certain Officers

Results of Operations and Financial Condition

Results of Operations and Financial Condition

Entry into a Material Definitive Agreement

Submission of Matters to a Vote of Security Holders

Results of Operations and Financial Condition

Results of Operations and Financial Condition

Results of Operations and Financial Condition

Results of Operations and Financial Condition

Financial Statements and Exhibits

Other Events

Submission of Matters to a Vote of Security Holders

Results of Operations and Financial Condition

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers: Compensatory Arrangements of Certain Officers

Results of Operations and Financial Condition

5.02,9.01

1.01,1.02,2.03,9.01

Entry into a Material Definitive Agreement

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers: Compensatory Arrangements of Certain Officers

7.01,9.01

Automatic Shelf Registration

Prospectus Supplement with Pricing Information

Notice of Effectiveness

Registration (IPO) statement under Securities Act of 1933

Registration statement under Securities Act of 1933 to be offered to employees pursuant to certain plans

Registration statement under Securities Act of 1933 to be offered to employees pursuant to certain plans

Certification of approval for listing and registration on a national securities exchange

No description available

No description available

No description available

No description available

No description available

Additional Information for Proxy Statement/ Votes

Definitive Proxy Statement

Definitive Proxy Statement

Additional Information for Proxy Statement/ Votes

Thompson Christopher M.T.

PRIMECAP MANAGEMENT CO/CA/

Mullen Sean Thomas

Johnson Travis Barton

Bruning Jill L

Invesco Ltd.

Arnette Stephen A

Heller John E.

VANGUARD GROUP INC

Bruning Jill L

Arnette Stephen A

St. Mary Michele T

EBERHART RALPH E

Brooks Vincent K

Rowland Sandra E.

IRELAND SUSAN LESLIE

DEMETRIOU STEVEN J.

Loughran Barbara

Thompson Christopher M.T.

Vollmer John C.

Annual Report Scanned (Paper)

Correspondence with the SEC

Correspondence with the SEC

Letter from the SEC

Draft registration statement (confidential submission)

Annual Report Scanned (Paper)

No description available

Correspondence with the SEC

Correspondence with the SEC

Letter from the SEC

Correspondence with the SEC

Letter from the SEC

Correspondence with the SEC

Letter from the SEC

Correspondence with the SEC

Letter from the SEC

Draft registration statement (confidential submission) (amendment)

No description available

Letter from the SEC

Draft registration statement (confidential submission)