AMTM · NYSE · CIK 0002011286

Amentum Holdings, Inc.

Amentum Holdings, Inc.’s most recent SEC filing in our snapshot is a Form 8-K filed on Oct 2, 2026. In fiscal 2025 (year ended Oct 3, 2025) it reported revenue of $14.4B and net income of $66.0M, according to its XBRL data on EDGAR. Its EDGAR record lists 34 Form 4 insider filings from the 12 months before our last refresh.

SEC EDGAR snapshot updated Oct 27, 2026, 11:27 PM EDT. See all filings on sec.gov.

Revenue, FY2025
$14.4B
Net income, FY2025
$66.0M
Form 4 filings on record, past 12 months
34

Company overview

Legal name (as filed)
Amentum Holdings, Inc.
Ticker
AMTM
SEC Central Index Key (CIK)
0002011286
Industry (SIC)
Services-Business Services, NEC (code 7389)
Business address
CHANTILLY, VA
State or country of incorporation
DE
Fiscal year ends
October 2
SEC filer category
Large accelerated filer
Position in SEC ticker list
#1316 of the 3,000 companies we track

Five-year financial highlights

Full-year figures from Amentum Holdings, Inc.’s annual reports, as tagged in XBRL and published by the SEC. Amounts are in U.S. dollars; the fiscal year is named for the calendar year in which it ends.

Revenue
$7.7BFY2022$7.9BFY2023$8.4BFY2024$14.4BFY2025
Net income
-$84.0MFY2022-$314.0MFY2023-$82.0MFY2024$66.0MFY2025
AMTM annual results
ItemFY2022
ended Sep 30, 2022		FY2023
ended Sep 29, 2023		FY2024
ended Sep 27, 2024		FY2025
ended Oct 3, 2025
Revenue$7.7B$7.9B$8.4B$14.4B
Net income-$84.0M-$314.0M-$82.0M$66.0M
Diluted EPS-$0.93-$3.49-$0.90$0.27
Total assets—$6.4B$12.0B$11.5B
Cash and equivalents$366.0M$305.0M$452.0M$437.0M

XBRL tags used: revenue = RevenueFromContractWithCustomerExcludingAssessedTax; netIncome = NetIncomeLoss; assets = Assets; eps = EarningsPerShareDiluted; cash = CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents. EPS is shown as originally reported for each year and may not be adjusted for later stock splits. A dash means the company did not report that item in a form we could match.

How to read these numbers

Revenue is the money a company brings in from selling its products and services; net income is what is left after all expenses, interest and taxes. Diluted EPS spreads net income across every share that could exist if options and convertible securities were exercised. Total assets and cash are balance-sheet figures measured on the last day of the fiscal year. For the full story — segment results, one-time charges, guidance — read Management’s Discussion and Analysis in the Form 10-K.

Latest key reports

The most recent filing of each major report type, even if it falls outside the 40 newest filings below.

AMTM latest annual, quarterly, current and proxy reports
FiledFormWhat it isOriginal
Nov 25, 202510-KAnnual report· period Oct 3, 2025Document · Index
Aug 11, 202610-QQuarterly report· period Jul 3, 2026Document · Index
Oct 2, 20268-KDirector or officer change· period Sep 28, 2026Document · Index
Dec 19, 2025DEF 14ADefinitive proxy statement· period Feb 6, 2026Document · Index

Recent SEC filings

The 40 newest documents filed by or about Amentum Holdings, Inc., by form type:

4 ×198-K ×74/A ×410-Q ×3SCHEDULE 13G/A ×2SCHEDULE 13G ×1ARS ×1DEFA14A ×1DEF 14A ×110-K ×1
AMTM recent filings
FiledFormWhat it isOriginal
Oct 2, 20268-KDirector or officer change· period Sep 28, 2026Document · Index
Sep 17, 20264Statement of changes in beneficial ownership (insider trade)· period Aug 14, 2026Document · Index
Aug 11, 202610-QQuarterly report· period Jul 3, 2026Document · Index
Aug 10, 20268-KResults of operations· period Aug 10, 2026Document · Index
Aug 6, 2026SCHEDULE 13GPassive beneficial ownership report (over 5%)Document · Index
May 12, 202610-QQuarterly report· period Apr 3, 2026Document · Index
May 11, 20268-KResults of operations· period May 11, 2026Document · Index
May 7, 20264Statement of changes in beneficial ownership (insider trade)· period May 6, 2026Document · Index
May 7, 20264Statement of changes in beneficial ownership (insider trade)· period May 6, 2026Document · Index
May 7, 20264Statement of changes in beneficial ownership (insider trade)· period May 6, 2026Document · Index
May 7, 20264Statement of changes in beneficial ownership (insider trade)· period May 6, 2026Document · Index
May 7, 20264Statement of changes in beneficial ownership (insider trade)· period May 6, 2026Document · Index
May 7, 2026SCHEDULE 13G/APassive beneficial ownership report (over 5%)Document · Index
Apr 28, 20268-KMaterial agreement· period Apr 24, 2026Document · Index
Mar 26, 2026SCHEDULE 13G/APassive beneficial ownership report (over 5%)Document · Index
Mar 5, 20264Statement of changes in beneficial ownership (insider trade)· period Mar 4, 2026Document · Index
Mar 4, 20264Statement of changes in beneficial ownership (insider trade)· period Mar 2, 2026Document · Index
Feb 18, 20264Statement of changes in beneficial ownership (insider trade)· period Feb 17, 2026Document · Index
Feb 10, 20264Statement of changes in beneficial ownership (insider trade)· period Feb 6, 2026Document · Index
Feb 10, 20264Statement of changes in beneficial ownership (insider trade)· period Feb 6, 2026Document · Index
Feb 10, 20264Statement of changes in beneficial ownership (insider trade)· period Feb 6, 2026Document · Index
Feb 10, 20264Statement of changes in beneficial ownership (insider trade)· period Feb 6, 2026Document · Index
Feb 10, 20264/AStatement of changes in beneficial ownership (insider trade)· period Nov 6, 2025Document · Index
Feb 10, 20264Statement of changes in beneficial ownership (insider trade)· period Feb 6, 2026Document · Index
Feb 10, 20264Statement of changes in beneficial ownership (insider trade)· period Feb 6, 2026Document · Index
Feb 10, 20264Statement of changes in beneficial ownership (insider trade)· period Feb 6, 2026Document · Index
Feb 10, 20268-KShareholder vote results· period Feb 6, 2026Document · Index
Feb 10, 202610-QQuarterly report· period Jan 2, 2026Document · Index
Feb 9, 20268-KResults of operations· period Feb 9, 2026Document · Index
Jan 29, 20264Statement of changes in beneficial ownership (insider trade)· period Jan 28, 2026Document · Index
Dec 19, 20254/AStatement of changes in beneficial ownership (insider trade)· period Nov 17, 2025Document · Index
Dec 19, 20254/AStatement of changes in beneficial ownership (insider trade)· period Nov 17, 2025Document · Index
Dec 19, 20254/AStatement of changes in beneficial ownership (insider trade)· period Nov 17, 2025Document · Index
Dec 19, 20254Statement of changes in beneficial ownership (insider trade)· period Dec 17, 2025Document · Index
Dec 19, 2025ARSARS· period Oct 3, 2025Document · Index
Dec 19, 2025DEFA14AAdditional proxy soliciting materialsDocument · Index
Dec 19, 2025DEF 14ADefinitive proxy statement· period Feb 6, 2026Document · Index
Dec 9, 20254Statement of changes in beneficial ownership (insider trade)· period Dec 5, 2025Document · Index
Nov 25, 202510-KAnnual report· period Oct 3, 2025Document · Index
Nov 24, 20258-KResults of operations· period Nov 24, 2025Document · Index

Insider filing activity

34 Form 4 filings appear in Amentum Holdings, Inc.’s EDGAR record between Oct 28, 2025 and our last refresh. Most are reports by the company’s own directors, officers and 10% owners, but EDGAR also lists a Form 4 under a company when the company itself is the insider — for example, when it owns more than 10% of another public company. Foreign private issuers’ own insiders generally do not file Form 4. A high count is not by itself a signal: many Form 4s report routine stock awards, tax withholding or sales under pre-arranged Rule 10b5-1 plans. Open each filing to see the transaction code, share count and price. What a Form 4 shows.

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Source

  • U.S. Securities and Exchange Commission, EDGAR submissions for CIK 0002011286 and XBRL company facts. Amentum Holdings, Inc. on EDGAR.
  • Snapshot updated Oct 27, 2026, 11:27 PM EDT. The SEC does not endorse OpenFilings. Company names and tickers are used only to identify the filer; no logos are shown.

Not investment advice. This page summarizes public SEC filings for information only. Figures may contain errors or omissions; confirm everything in the original filing before relying on it.