Amentum Holdings, Inc. (AMTM)
SERVICES-BUSINESS SERVICES, NEC
Amentum Holdings, Inc. (AMTM) is listed on the New York Stock Exchange, where it has traded since September 24, 2024.
- Listed On
- the New York Stock Exchange
- Listed Since
- September 24, 2024
- Employees
- 50,000
- Market Cap
- $5.3B
About Amentum Holdings, Inc.
Amentum Holdings Inc is an engineering and technology solutions provider serving U.S. and allied government agencies, as well as international and commercial customers across energy and environmental, intelligence, space, defense, civilian and commercial markets. It provides environmental remediation, intelligence and counter-threat solutions, data analytics, engineering and integration, testing, training and citizen services. The company operates through two segments: Digital Solutions, offering digital and data-driven services, and Global Engineering Solutions, providing environmental remediation, nuclear power solutions, platform engineering, sustainment, and supply chain management. majority of its revenue comes from the Global Engineering Solutions segment and from the United States.
Institutional ownership
In 13F filings for the quarter ended June 30, 2026, 451 institutions reported holding AMTM, with 218.7 million shares worth $4.3 billion in aggregate. The largest reported holder was American Securities, with 45.0 million shares worth $930.7 million. Of the 5 largest holders listed below, 4 added shares and 1 held its position unchanged during the quarter.
| Institution | Shares | Value | Quarter change |
|---|---|---|---|
| American Securities | 45,026,743 | $931M | Unchanged |
| Invesco Ltd | 24,954,251 | $516M | Added 16.21% |
| BlackRock | 17,906,984 | $370M | Added 0.37% |
| Vanguard | 15,950,609 | $330M | Added 1.62% |
| Primecap Management Co | 12,285,504 | $254M | Added 1.66% |
Form 13F is a quarterly report that institutional investment managers with at least $100 million in qualifying securities file with the SEC. It lists long positions as of the last day of the quarter and is due within 45 days of quarter end, so these holdings describe that date rather than today.
Frequently asked questions
What is AMTM?
Amentum Holdings, Inc. (AMTM) is listed on the New York Stock Exchange, where it has traded since September 24, 2024.
Who are the largest institutional holders of AMTM?
In 13F filings for the quarter ended June 30, 2026, the largest reported holders of AMTM were American Securities, Invesco Ltd and BlackRock.
How many institutions own AMTM?
451 institutions reported a position in AMTM for the quarter ended June 30, 2026, worth $4.3 billion in total.
Did institutions buy or sell AMTM last quarter?
Of the 5 largest reported holders, 4 added shares and 1 held its position unchanged during the quarter. Every reported holder and its change is on the SentiSense ownership page for AMTM.
Every reported institutional holder, plus insider and congressional trades in AMTM, on SentiSense.