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See how Context works →On the price, the facts of the public record●Results filed
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End-of-day prices provided by Twelve Data · One close per session; the series does not update during the trading day.
Latest on record
The most recent facts, as filed.
Up to three of the most recent, checkable facts already loaded on this page, each linked to its source.
- Oct 2, 2026Material event · 8-KFiled by the company itself.Open the filing ↗
- Aug 11, 2026Quarterly report · 10-QFiled by the company itself.Open the filing ↗
- Aug 10, 2026Material event · 8-KFiled by the company itself.Open the filing ↗
In numbers
What this profile holds, counted.
Closes · 1 year250
SEC filings on record17812 flagged findings
Reported transactions (Form 4)80since Mar 4, 2025 · and 11 other holdings
Corporate events (8-K)12since Sep 27, 2024
What the record says
Description, identity and filings, each with its source.
Every block cites its source. The colour of a finding marks its category — which document, who filed it — not how much it matters.
What the company does
Amentum Holdings, Inc. is an American government and commercial services contractor based in Chantilly, Virginia. The company was formed in 2020 from the spinout of AECOM's Management Services / federal group. After Leidos, it is the second-largest government services contractor in the US government contracting market.
Source: Wikipedia (CC BY-SA 4.0) · copied on Sep 3, 2026 · may not reflect recent changes.
The 25 most recent filings (of 178)
Every SEC filing, newest first, with what it is. Below, each type with its own explanation.
- Oct 2, 268-K ↗Current report · A senior executive left or was appointed
- Sep 17, 26Form 4 ↗Insider transaction
- Aug 11, 2610-Q ↗Quarterly report
- Aug 10, 268-K ↗Current report · Results
- Aug 6, 26SCHEDULE 13G ↗Passive stake · PRIMECAP MANAGEMENT CO/CA/ · 5.0% · event on Jun 30, 26
- May 12, 2610-Q ↗Quarterly report
- May 11, 268-K ↗Current report · Results
- May 7, 26SCHEDULE 13G/A ↗Passive stake · Invesco Ltd. · 10.1% · event on Apr 30, 26 · amendment
- Apr 28, 268-K ↗Current report · Entered a material agreement
- Mar 26, 26SCHEDULE 13G/A ↗Passive stake · amendment
Insider transaction · 7 Form 4 filingsshow all 7hide
- Feb 10, 26Form 4/A ↗Insider transaction · amendment
178 filings on record, the oldest from Apr 4, 24.
Listing the 25 most recent filings of the 178 on record.
66
- Oct 2, 26A senior executive left or was appointed+1 more in the same filing8-K 5.02 ↗
- Apr 28, 26Entered a material agreement8-K 1.01 ↗
- Jan 30, 25A senior executive left or was appointed+1 more in the same filing8-K 5.02 ↗
- Nov 13, 24A senior executive left or was appointed+1 more in the same filing8-K 5.02 ↗
- Oct 3, 24Entered a material agreement+3 more in the same filing8-K/A 1.01 ↗
- Oct 3, 24Entered a material agreement+6 more in the same filing8-K 1.01 ↗
- Sep 27, 24A senior executive left or was appointed+2 more in the same filing8-K 5.02 ↗
Corporate events are tracked from 2004-08-23, when the SEC renumbered 8-K items. Earlier filings use an incompatible numbering and are not classified here.
Schedule 13D: stake and stated purpose
Filed by holders above 5% of a share class who cannot use the short form. It includes the investor's stated purpose: read it before assuming they seek influence.
- ASP Amentum Investco LP18.0%Dec 17, 24SCHEDULE 13D ↗3 co-filers on this document — the figure is the largest single stake, not their sum.
- Alan E. Goldberg18.0%Dec 17, 24SCHEDULE 13D ↗17 co-filers on this document — the figure is the largest single stake, not their sum.
Schedule 13G: short-form filing
The short form, for holders who meet specific requirements: institutional investors, passive investors without a control purpose, or exempt investors. Asset managers and index funds usually file it.
- Invesco Ltd.10.1%Apr 30, 26SCHEDULE 13G/A ↗3 earlier filings
- BlackRock, Inc.6.9%Dec 31, 24SCHEDULE 13G/A ↗
- The Vanguard Group6.8%Dec 31, 24SCHEDULE 13G/A ↗
- PRIMECAP MANAGEMENT CO/CA/5.0%Jun 30, 26SCHEDULE 13G ↗
Structured 13D/G data starts 2023-12, when the SEC moved these filings to a machine-readable format. Earlier filings exist but are not parsed here.
No purchases or sales are on record in this stretch; only other transactions (compensation, withholding, exercises or gifts).
Stock compensation, tax and giftsshow the 40 other transactionshide
Stock compensation, tax withholding, option exercises and gifts. They are listed separately and are not included in the purchase and sale totals. The type describes the transaction, not the filer's intent.
- Aug 14, 26Giftamount n/aChristopher M.T. Thompson↗
- May 6, 26Compensationamount n/aStephen A ArnetteChief Operating Officer↗
- May 6, 26Tax$82KStephen A ArnetteChief Operating Officer↗
- May 6, 26Compensationamount n/aJill L BruningChief Technology Officer↗
- May 6, 26Tax$68KJill L BruningChief Technology Officer↗
- May 6, 26Compensationamount n/aTravis Barton JohnsonChief Financial Officer↗
- May 6, 26Tax$102KTravis Barton JohnsonChief Financial Officer↗
- May 6, 26Compensationamount n/aSean Thomas MullenChief Growth Officer↗
- May 6, 26Tax$69KSean Thomas MullenChief Growth Officer↗
- May 6, 26Compensationamount n/aJohn E. HellerChief Executive Officer↗
- May 6, 26Tax$204KJohn E. HellerChief Executive Officer↗
- Mar 4, 26Giftamount n/aJill L BruningChief Technology Officer↗
- Mar 2, 26Compensationamount n/aStephen A ArnetteChief Operating Officer↗
- Mar 2, 26Tax$23KStephen A ArnetteChief Operating Officer↗
- Feb 17, 26Compensationamount n/aMary Michele T St.Chief Legal Officer & GC↗
- Feb 17, 26Tax$69KMary Michele T St.Chief Legal Officer & GC↗
- Feb 6, 26Compensationamount n/aJohn C. Vollmer↗
- Feb 6, 26Compensationamount n/aJohn C. Vollmer↗
- Feb 6, 26Compensationamount n/aChristopher M.T. Thompson↗
- Feb 6, 26Compensationamount n/aBarbara Loughran↗
- Feb 6, 26Compensationamount n/aRALPH E EBERHART↗
- Feb 6, 26Compensationamount n/aRALPH E EBERHART↗
- Feb 6, 26Compensationamount n/aVincent K Brooks↗
- Feb 6, 26Compensationamount n/aVincent K Brooks↗
- Feb 6, 26Compensationamount n/aSandra E. Rowland↗
- Feb 6, 26Compensationamount n/aSandra E. Rowland↗
- Feb 6, 26Compensationamount n/aSUSAN LESLIE IRELAND↗
- Jan 28, 26Compensationamount n/aJohn E. HellerChief Executive Officer↗
- Jan 28, 26Tax$706KJohn E. HellerChief Executive Officer↗
- Dec 17, 25Compensationamount n/aSean Thomas MullenChief Growth Officer↗
- Dec 17, 25Tax$120KSean Thomas MullenChief Growth Officer↗
- Dec 5, 25Compensationamount n/aDarren BurtonChief People Officer↗
- Dec 5, 25Tax$40KDarren BurtonChief People Officer↗
- Nov 17, 25Compensationamount n/aSTEVEN J. DEMETRIOUExecutive Chair↗
- Nov 17, 25Tax$367KSTEVEN J. DEMETRIOUExecutive Chair↗
- Nov 17, 25Compensationamount n/aSTEVEN J. DEMETRIOUExecutive Chair↗
- Nov 17, 25Compensationamount n/aStephen A ArnetteChief Operating Officer↗
- Nov 17, 25Tax$6KStephen A ArnetteChief Operating Officer↗
- Nov 17, 25Compensationamount n/aStephen A ArnetteChief Operating Officer↗
- Nov 17, 25Compensationamount n/aMary Michele T St.Chief Legal Officer & GC↗
The full record holds 91 transactions and goes back to Sep 18, 24.
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- 178 documents on file, from Apr 4, 2024 to Oct 2, 2026.
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- Wikipedia, read on Sep 3, 2026.
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