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AMTMNYSEServices-Business Services, NECFiscal year ends October 2

Amentum Holdings, Inc.

Financials through Q3 FY2026, quarter ended Jul 3, 2026Last filing: 10-Q on Aug 11, 2026
$19.48−0.04 (-0.20%)

Close on Oct 19, 2026

Market cap
$4.77B
P/E (TTM)
23.5
Dividend yield
–

About Amentum

Services-Business Services, NEC, SIC 7389

Amentum Holdings, Inc. delivers advanced engineering, technology, and mission-critical solutions to government and commercial clients worldwide. Operating through two core reportable divisions—Digital Solutions and Global Engineering Solutions—the enterprise supplies specialized capabilities that encompass cybersecurity, intelligence analytics, space system engineering, next-generation information technology, and comprehensive environmental cleanup and nuclear services. Its primary customer base consists of the United States federal government, notably defense, energy, intelligence, and space exploration agencies. It also serves allied international government organizations alongside commercial entities across the aerospace, automotive, telecommunications, and energy sectors.

The enterprise maintains an international presence with operations spanning all seven continents and a workforce of approximately 50,000 personnel located across more than 70 nations, with approximately one-quarter of its staff positioned outside the United States. The company is incorporated in Delaware, and its corporate headquarters are not identified in the provided text.

Summary of the business section of Amentum's latest annual report, written by StockData.

Company profile

Company

Legal name
Amentum Holdings, Inc.
Founded
2024
Headquarters
Chantilly, VA
Address
4800 Westfields Boulevard, Suite 400 20151
Phone
(703) 579-0410
Employees
50,000, Oct 3, 2025
Industry
Services-Business Services, NEC
Incorporated in
Delaware
Fiscal year ends
October 2
Auditor
Ernst & Young LLP, Tysons, Virginia

Stock & identifiers

Ticker
AMTM
Exchange
NYSE
IPO date
Mar 12, 2025
Shares outstanding
245M, Aug 7, 2026
Public float
$4.40B, Mar 28, 2025
Filer category
Large accelerated filer
SEC CIK
2011286
CUSIP
023939101
ISIN
US0239391016
LEI
2549009FJIBLW40CU216
EIN
99-0622272

Executives and directors

Officers and directors who filed ownership reports (Forms 3, 4, 5) in the last two years

NamePositionShares owned
John E. HellerChief Executive Officer, Director376,019
Steven J. DemetriouExecutive Chair, Director861,218
Stephen A. ArnetteChief Operating Officer106,652
Sean Thomas MullenChief Growth Officer35,210
Travis Barton JohnsonChief Financial Officer122,284
Jill L. BruningChief Technology Officer197,457
Mary Michele T. St.Chief Legal Officer & GC27,043
Darren BurtonChief People Officer23,600
Stuart Ira YoungChief Legal Officer–
Christopher M.T. ThompsonDirector24,812
Vincent K. BrooksDirector22,400
Sandra E. RowlandDirector20,073
Susan Leslie IrelandDirector8,509
John C. VollmerDirector424,780
Ralph E. EberhartDirector43,058
Barbara LoughranDirector9,662
Joint Venture GP LLC AmentumDirector2,433,022
Joint Venture LP AmentumDirector0
Alan E. GoldbergDirector45,026,743

CEO pay and shareholder return

Pay versus performance table from the proxy statement

Fiscal yearCEO total payCEO pay actually paidOther executives (avg)Value of $100 investedPeer group
FY2025
Mr.Heller
$21.20M$30.95M$4.31M$101$90
FY2024
Mr.Heller
$2.73M$2.78M$2.80M$0$0

“Actually paid” adjusts reported pay for changes in the value of equity awards. Shareholder return assumes $100 invested at the start of the measurement period, as disclosed by the company.

Employees

Headcount reported in annual reports

“With a workforce of approximately 50,000 people globally, we are also party to labor and employment claims in the normal course of business.”

Corporate history

Events identified from SEC filings

DateEventDetails
Mar 12, 2025IPOInitial public offering priced (424B4 prospectus)
Oct 3, 2024Acquisition / saleCompletion of acquisition or disposition of assets (8-K Item 2.01)
Sep 18, 2024Name changeName changed from Amazon Holdco Inc. to Amentum Holdings, Inc.
Jul 15, 2024Spin-offRegistration as a new public company (Form 10), e.g. spin-off