Amentum Holdings, Inc.

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

General form for quarterly reports under Section 13 or 15(d)

Results of Operations and Financial Condition

Beneficial ownership report for a passive holder of more than 5% (Schedule 13G)

General form for quarterly reports under Section 13 or 15(d)

Results of Operations and Financial Condition

Beneficial ownership report for a passive holder of more than 5% (Schedule 13G) (amendment)

Entry into a Material Definitive Agreement

Beneficial ownership report for a passive holder of more than 5% (Schedule 13G) (amendment)

General form for quarterly reports under Section 13 or 15(d)

Submission of Matters to a Vote of Security Holders

Results of Operations and Financial Condition

Annual Report Scanned (Paper)

Additional Information for Proxy Statement/ Votes

Definitive Proxy Statement

Annual report pursuant to Section 13 or 15(d)

Results of Operations and Financial Condition

Automatic Shelf Registration

General form for quarterly reports under Section 13 or 15(d)

Results of Operations and Financial Condition

General form for quarterly reports under Section 13 or 15(d)

Results of Operations and Financial Condition

Prospectus Supplement with Pricing Information

Notice of Effectiveness

Correspondence with the SEC

Correspondence with the SEC

Registration (IPO) statement under Securities Act of 1933

Financial Statements and Exhibits

Other Events

Submission of Matters to a Vote of Security Holders

General form for quarterly reports under Section 13 or 15(d)

Results of Operations and Financial Condition

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

Letter from the SEC

Draft registration statement (confidential submission)

Annual Report Scanned (Paper)

Definitive Proxy Statement

Additional Information for Proxy Statement/ Votes

Annual report pursuant to Section 13 or 15(d)

Results of Operations and Financial Condition

5.02,9.01

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

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

No description available

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

Correspondence with the SEC

No description available

Correspondence with the SEC

No description available

Letter from the SEC

Correspondence with the SEC

No description available

Letter from the SEC

Correspondence with the SEC

No description available

Letter from the SEC

Correspondence with the SEC

No description available

Letter from the SEC

Draft registration statement (confidential submission) (amendment)

No description available

Letter from the SEC

Draft registration statement (confidential submission)

Thompson Christopher M.T.

Mullen Sean Thomas

Johnson Travis Barton

Bruning Jill L

Arnette Stephen A

Heller John E.

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.