Amentum Holdings, Inc. SEC filings AMTM
Amentum Holdings, Inc. has 194 filings in SEC EDGAR's recent list, going back to Mar 7, 2024. Its latest annual report, Form ARS, was filed on Dec 19, 2025 for the period ended Oct 3, 2025. The latest quarterly report (Form 10-Q) was filed on Aug 11, 2026, covering the quarter ended Jul 3, 2026. The most recent current report (Form 8-K) was filed on Oct 2, 2026 (officer or director change). The company's fiscal year ends on October 2.
| Form | Description | Filed | Period |
|---|---|---|---|
| 8-K |
Current report
Officer or director change
|
Oct 2, 2026 | Sep 28, 2026 |
| 4 | Insider transaction | Sep 17, 2026 | Aug 14, 2026 |
| 10-Q | Quarterly report | Aug 11, 2026 | Jul 3, 2026 |
| 8-K |
Current report
Results of operations
|
Aug 10, 2026 | Aug 10, 2026 |
| SCHEDULE 13G | Ownership over 5% (passive) | Aug 6, 2026 | — |
| 10-Q | Quarterly report | May 12, 2026 | Apr 3, 2026 |
| 8-K |
Current report
Results of operations
|
May 11, 2026 | May 11, 2026 |
| 4 | Insider transaction | May 7, 2026 | May 6, 2026 |
| 4 | Insider transaction | May 7, 2026 | May 6, 2026 |
| 4 | Insider transaction | May 7, 2026 | May 6, 2026 |
| 4 | Insider transaction | May 7, 2026 | May 6, 2026 |
| 4 | Insider transaction | May 7, 2026 | May 6, 2026 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | May 7, 2026 | — |
| 8-K |
Current report
Material agreement
|
Apr 28, 2026 | Apr 24, 2026 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Mar 26, 2026 | — |
| 4 | Insider transaction | Mar 5, 2026 | Mar 4, 2026 |
| 4 | Insider transaction | Mar 4, 2026 | Mar 2, 2026 |
| 4 | Insider transaction | Feb 18, 2026 | Feb 17, 2026 |
| 4 | Insider transaction | Feb 10, 2026 | Feb 6, 2026 |
| 4 | Insider transaction | Feb 10, 2026 | Feb 6, 2026 |
| 4 | Insider transaction | Feb 10, 2026 | Feb 6, 2026 |
| 4 | Insider transaction | Feb 10, 2026 | Feb 6, 2026 |
| 4/A | Form 4/a | Feb 10, 2026 | Nov 6, 2025 |
| 4 | Insider transaction | Feb 10, 2026 | Feb 6, 2026 |
| 4 | Insider transaction | Feb 10, 2026 | Feb 6, 2026 |
| 4 | Insider transaction | Feb 10, 2026 | Feb 6, 2026 |
| 8-K |
Current report
Shareholder vote results
|
Feb 10, 2026 | Feb 6, 2026 |
| 10-Q | Quarterly report | Feb 10, 2026 | Jan 2, 2026 |
| 8-K |
Current report
Results of operations
|
Feb 9, 2026 | Feb 9, 2026 |
| 4 | Insider transaction | Jan 29, 2026 | Jan 28, 2026 |
| 4/A | Form 4/a | Dec 19, 2025 | Nov 17, 2025 |
| 4/A | Form 4/a | Dec 19, 2025 | Nov 17, 2025 |
| 4/A | Form 4/a | Dec 19, 2025 | Nov 17, 2025 |
| 4 | Insider transaction | Dec 19, 2025 | Dec 17, 2025 |
| ARS | Annual report to shareholders | Dec 19, 2025 | Oct 3, 2025 |
| DEFA14A | Additional proxy material | Dec 19, 2025 | — |
| DEF 14A | Proxy statement | Dec 19, 2025 | Feb 6, 2026 |
| 4 | Insider transaction | Dec 9, 2025 | Dec 5, 2025 |
| 10-K | Annual report | Nov 25, 2025 | Oct 3, 2025 |
| 8-K |
Current report
Results of operations
|
Nov 24, 2025 | Nov 24, 2025 |
| 4 | Insider transaction | Nov 19, 2025 | Nov 17, 2025 |
| 4 | Insider transaction | Nov 19, 2025 | Nov 17, 2025 |
| 4 | Insider transaction | Nov 19, 2025 | Nov 17, 2025 |
| 4 | Insider transaction | Nov 19, 2025 | Nov 17, 2025 |
| 4 | Insider transaction | Nov 19, 2025 | Nov 17, 2025 |
| 4 | Insider transaction | Nov 19, 2025 | Nov 17, 2025 |
| 4 | Insider transaction | Nov 19, 2025 | Nov 17, 2025 |
| 4 | Insider transaction | Nov 19, 2025 | Nov 17, 2025 |
| 4 | Insider transaction | Nov 18, 2025 | Nov 15, 2025 |
| 4 | Insider transaction | Nov 10, 2025 | Nov 6, 2025 |
| 4 | Insider transaction | Nov 10, 2025 | Nov 6, 2025 |
| 4 | Insider transaction | Nov 10, 2025 | Nov 6, 2025 |
| 4 | Insider transaction | Nov 10, 2025 | Nov 6, 2025 |
| 4 | Insider transaction | Nov 10, 2025 | Nov 6, 2025 |
| 4 | Insider transaction | Nov 10, 2025 | Nov 6, 2025 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Nov 6, 2025 | — |
| S-3ASR | Automatic shelf registration | Oct 1, 2025 | — |
| 10-Q | Quarterly report | Aug 6, 2025 | Jun 27, 2025 |
| 8-K |
Current report
Results of operations
|
Aug 5, 2025 | Aug 5, 2025 |
| 4 | Insider transaction | May 12, 2025 | May 8, 2025 |
| 4 | Insider transaction | May 12, 2025 | May 8, 2025 |
| 4 | Insider transaction | May 12, 2025 | May 8, 2025 |
| 4 | Insider transaction | May 12, 2025 | May 8, 2025 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | May 9, 2025 | — |
| 10-Q | Quarterly report | May 7, 2025 | Mar 28, 2025 |
| 8-K |
Current report
Results of operations
|
May 6, 2025 | May 6, 2025 |
| 4 | Insider transaction | Apr 10, 2025 | Apr 8, 2025 |
| 4 | Insider transaction | Apr 10, 2025 | Apr 8, 2025 |
| 4 | Insider transaction | Apr 10, 2025 | Apr 8, 2025 |
| 4 | Insider transaction | Apr 10, 2025 | Apr 8, 2025 |
| 4 | Insider transaction | Apr 10, 2025 | Apr 8, 2025 |
| 4 | Insider transaction | Apr 10, 2025 | Apr 8, 2025 |
| 4 | Insider transaction | Apr 10, 2025 | Apr 8, 2025 |
| 4 | Insider transaction | Apr 8, 2025 | Apr 7, 2025 |
| 4 | Insider transaction | Mar 19, 2025 | Mar 17, 2025 |
| 4 | Insider transaction | Mar 17, 2025 | Mar 13, 2025 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Mar 13, 2025 | — |
| 424B4 | Prospectus | Mar 12, 2025 | — |
| EFFECT | Filing | Mar 11, 2025 | — |
| CORRESP | Letter to the SEC | Mar 10, 2025 | — |
| CORRESP | Letter to the SEC | Mar 10, 2025 | — |
| S-1 | Registration statement | Mar 10, 2025 | — |
| 8-K |
Current report
Other events
|
Mar 7, 2025 | Mar 7, 2025 |
| 4 | Insider transaction | Mar 7, 2025 | Mar 5, 2025 |
| 4 | Insider transaction | Mar 7, 2025 | Mar 5, 2025 |
| 8-K | Current report | Mar 7, 2025 | Mar 7, 2025 |
| 4 | Insider transaction | Mar 7, 2025 | Mar 5, 2025 |
| 4 | Insider transaction | Mar 7, 2025 | Mar 5, 2025 |
| 4 | Insider transaction | Mar 7, 2025 | Mar 5, 2025 |
| 8-K |
Current report
Shareholder vote results
|
Mar 7, 2025 | Mar 5, 2025 |
| 4 | Insider transaction | Mar 5, 2025 | Mar 3, 2025 |
| 3 | Initial insider ownership | Feb 24, 2025 | Feb 17, 2025 |
| 4 | Insider transaction | Feb 20, 2025 | Feb 18, 2025 |
| 4 | Insider transaction | Feb 14, 2025 | Feb 12, 2025 |
| SCHEDULE 13G | Ownership over 5% (passive) | Feb 7, 2025 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Feb 5, 2025 | — |
| 10-Q | Quarterly report | Feb 5, 2025 | Dec 27, 2024 |
| 8-K |
Current report
Results of operations
|
Feb 4, 2025 | Feb 4, 2025 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Jan 30, 2025 | — |
| 4 | Insider transaction | Jan 30, 2025 | Jan 28, 2025 |
| 8-K |
Current report
Officer or director change
|
Jan 30, 2025 | Jan 28, 2025 |
| UPLOAD | Letter from the SEC | Jan 24, 2025 | — |
| DRS | Filing | Jan 22, 2025 | — |
| ARS | Annual report to shareholders | Jan 21, 2025 | Sep 27, 2024 |
| DEFA14A | Additional proxy material | Jan 21, 2025 | — |
| DEF 14A | Proxy statement | Jan 21, 2025 | Mar 5, 2025 |
| 3/A | Filing | Dec 30, 2024 | Dec 17, 2024 |
| 3 | Initial insider ownership | Dec 27, 2024 | Dec 17, 2024 |
| 4 | Insider transaction | Dec 27, 2024 | Dec 17, 2024 |
| 3 | Initial insider ownership | Dec 27, 2024 | Dec 17, 2024 |
| 3 | Initial insider ownership | Dec 27, 2024 | Dec 17, 2024 |
| SCHEDULE 13D | Ownership over 5% (active) | Dec 23, 2024 | — |
| SCHEDULE 13D | Ownership over 5% (active) | Dec 23, 2024 | — |
| 4 | Insider transaction | Dec 23, 2024 | Dec 20, 2024 |
| 4 | Insider transaction | Dec 19, 2024 | Dec 17, 2024 |
| SCHEDULE 13D/A | Amended ownership over 5% (active) | Dec 19, 2024 | — |
| 10-K | Annual report | Dec 17, 2024 | Sep 27, 2024 |
| 8-K |
Current report
Results of operations
|
Dec 16, 2024 | Dec 16, 2024 |
| 4 | Insider transaction | Dec 9, 2024 | Dec 5, 2024 |
| 3 | Initial insider ownership | Dec 9, 2024 | Dec 2, 2024 |
| 8-K |
Current report
Officer or director change
|
Nov 13, 2024 | Nov 6, 2024 |
| SC 13G | Ownership over 5% (passive) | Nov 12, 2024 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Nov 12, 2024 | — |
| SC 13G | Ownership over 5% (passive) | Nov 12, 2024 | — |
| 4 | Insider transaction | Nov 8, 2024 | Nov 6, 2024 |
| 4 | Insider transaction | Nov 8, 2024 | Nov 6, 2024 |
| 4 | Insider transaction | Nov 8, 2024 | Nov 6, 2024 |
| 4 | Insider transaction | Nov 8, 2024 | Nov 6, 2024 |
| 4 | Insider transaction | Nov 8, 2024 | Nov 6, 2024 |
| 4 | Insider transaction | Nov 8, 2024 | Nov 6, 2024 |
| 4 | Insider transaction | Nov 8, 2024 | Nov 6, 2024 |
| 4 | Insider transaction | Nov 8, 2024 | Nov 6, 2024 |
| 4 | Insider transaction | Nov 8, 2024 | Nov 6, 2024 |
| S-8 | Employee stock plan registration | Nov 8, 2024 | — |
| 4 | Insider transaction | Nov 8, 2024 | Nov 6, 2024 |
| 4 | Insider transaction | Nov 8, 2024 | Nov 6, 2024 |
| 4 | Insider transaction | Nov 8, 2024 | Nov 6, 2024 |
| 4 | Insider transaction | Nov 8, 2024 | Nov 6, 2024 |
| 4 | Insider transaction | Nov 8, 2024 | Nov 6, 2024 |
| SC 13G/A | Amended ownership over 5% (passive) | Nov 4, 2024 | — |
| SC 13G | Ownership over 5% (passive) | Oct 24, 2024 | — |
| SC 13D | Ownership over 5% (active) | Oct 4, 2024 | — |
| 4 | Insider transaction | Oct 4, 2024 | Oct 2, 2024 |
| 4 | Insider transaction | Oct 4, 2024 | Oct 2, 2024 |
| S-8 | Employee stock plan registration | Oct 4, 2024 | — |
| 8-K/A |
Amended current report
Material agreement, Agreement ended, New debt
|
Oct 3, 2024 | Sep 27, 2024 |
| 8-K |
Current report
Material agreement, Acquisition or sale of assets, Change in control, Officer or director change, Bylaw or fiscal year change, Regulation FD disclosure
|
Oct 3, 2024 | Sep 27, 2024 |
| 3 | Initial insider ownership | Sep 27, 2024 | Sep 27, 2024 |
| 3 | Initial insider ownership | Sep 27, 2024 | Sep 27, 2024 |
| 3 | Initial insider ownership | Sep 27, 2024 | Sep 27, 2024 |
| 3 | Initial insider ownership | Sep 27, 2024 | Sep 27, 2024 |
| 3 | Initial insider ownership | Sep 27, 2024 | Sep 27, 2024 |
| 3 | Initial insider ownership | Sep 27, 2024 | Sep 27, 2024 |
| 3 | Initial insider ownership | Sep 27, 2024 | Sep 23, 2024 |
| 3 | Initial insider ownership | Sep 27, 2024 | Sep 27, 2024 |
| 3 | Initial insider ownership | Sep 27, 2024 | Sep 27, 2024 |
| 3 | Initial insider ownership | Sep 27, 2024 | Sep 27, 2024 |
| 3 | Initial insider ownership | Sep 27, 2024 | Sep 27, 2024 |
| 3 | Initial insider ownership | Sep 27, 2024 | Sep 27, 2024 |
| 3 | Initial insider ownership | Sep 27, 2024 | Sep 27, 2024 |
| 3 | Initial insider ownership | Sep 27, 2024 | Sep 27, 2024 |
| 3 | Initial insider ownership | Sep 27, 2024 | Sep 27, 2024 |
| 3 | Initial insider ownership | Sep 27, 2024 | Sep 27, 2024 |
| 8-K |
Current report
Officer or director change, Bylaw or fiscal year change
|
Sep 27, 2024 | Sep 26, 2024 |
| 3 | Initial insider ownership | Sep 27, 2024 | Sep 27, 2024 |
| 3 | Initial insider ownership | Sep 27, 2024 | Sep 27, 2024 |
| 4 | Insider transaction | Sep 25, 2024 | Sep 23, 2024 |
| 3 | Initial insider ownership | Sep 18, 2024 | Sep 18, 2024 |
| SEC STAFF ACTION | Filing | Sep 18, 2024 | — |
| 3 | Initial insider ownership | Sep 18, 2024 | Sep 18, 2024 |
| 3 | Initial insider ownership | Sep 18, 2024 | Sep 18, 2024 |
| 3 | Initial insider ownership | Sep 18, 2024 | Sep 18, 2024 |
| 3 | Initial insider ownership | Sep 18, 2024 | Sep 18, 2024 |
| 3 | Initial insider ownership | Sep 18, 2024 | Sep 18, 2024 |
| 8-K |
Current report
Regulation FD disclosure
|
Sep 18, 2024 | Sep 18, 2024 |
| CERT | Nyse certification | Sep 17, 2024 | — |
| CORRESP | Letter to the SEC | Sep 16, 2024 | — |
| 10-12B/A | Filing | Sep 13, 2024 | — |
| CORRESP | Letter to the SEC | Sep 9, 2024 | — |
| 10-12B/A | Filing | Sep 9, 2024 | — |
| UPLOAD | Letter from the SEC | Sep 5, 2024 | — |
| CORRESP | Letter to the SEC | Aug 26, 2024 | — |
| 10-12B/A | Filing | Aug 26, 2024 | — |
| UPLOAD | Letter from the SEC | Aug 21, 2024 | — |
| CORRESP | Letter to the SEC | Aug 5, 2024 | — |
| 10-12B/A | Filing | Aug 5, 2024 | — |
| UPLOAD | Letter from the SEC | Jul 25, 2024 | — |
| CORRESP | Letter to the SEC | Jul 15, 2024 | — |
| 10-12B | Filing | Jul 15, 2024 | — |
| UPLOAD | Letter from the SEC | Jun 4, 2024 | — |
| DRSLTR | Filing | May 10, 2024 | — |
| DRS/A | Filing | May 10, 2024 | — |
| UPLOAD | Letter from the SEC | Apr 4, 2024 | — |
| DRS | Filing | Mar 7, 2024 | — |
Showing 194 filings. Main filings leave out insider and ownership forms such as Form 4; choose a type above to see them. Each form opens on SEC.gov. Older filings are on SEC EDGAR.
New to this? Read What Are SEC Filings? 10-K, 10-Q, 8-K and Other Forms Explained.
Company profile
- Industry
- Services-Business Services, NEC (SIC 7389)
- Listed as
- AMTM (NYSE)
- Fiscal year ends
- October 2
- Incorporated in
- DE
- Headquarters
- Chantilly, VA
- SEC filer status
- Large accelerated filer
- SEC CIK
- 2011286
- Former names
- Amazon Holdco Inc. (until Sep 18, 2024)
Other Services-Business Services, NEC companies
- Visa Inc. V
- Mastercard Inc MA
- Alibaba Group Holding Ltd BABA
- Accenture plc ACN
- Uber Technologies, Inc UBER
- PDD Holdings Inc. PDD
- Mercadolibre Inc MELI
- DoorDash, Inc. DASH
Source: SEC EDGAR filings. This is company-reported data, not investment advice.