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Amentum Holdings, Inc. (AMTM)

NYSE: AMTM · Services-Business Services, NEC · Chantilly, VA · filing with the SEC since 2024
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Grade5.5
◀ Past 5.1● Present 5.5▶ Future 5.6
1 est.
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Who owns Amentum Holdings, Inc.

As filed with the SEC
Holders of 5% or more
5
ASP Amentum Investco LP holds 18% of Common Stock, par value $0.01 per share, as its SCHEDULE 13D filed Dec 23, 2024 says.
Directors and officers
15
report now, of 26 people on the record since 2024. Their holdings as a group are not read here.
Institutions as a whole
n/a
The record does not read the share held by managers that file Form 13F, so none is printed and no split of the rest is estimated. What it holds is the 5 named at left.
Holders of 5% or moreshare of the class, as filed
ASP Amentum Investco LP
SCHEDULE 13D · filed Dec 23, 2024 · Common Stock, par value $0.01 per share
18%
Alan E. Goldberg
SCHEDULE 13D · filed Dec 23, 2024 · Common Stock, par value $0.01 per share
18%
Invesco LTD
SCHEDULE 13G/A · filed May 7, 2026 · Common Stock · 9.1% in Nov 6, 2025
10.1%
Blackrock, Inc.
SCHEDULE 13G/A · filed Feb 5, 2025 · Common Stock
6.9%
Primecap Management Co/ca/
SCHEDULE 13G · filed Aug 6, 2026 · COMM
5.03%
The Vanguard Group
SCHEDULE 13G/A · filed Mar 26, 2026 · Common Stock · reported falling below 5%, from 6.79% in Jan 30, 2025
under 5%
Jacobs Solutions Inc.
SCHEDULE 13G/A · filed Mar 13, 2025 · Common Stock, $0.01 par value · reported falling below 5%
under 5%
Amentum Joint Venture LP
SCHEDULE 13D/A · filed Dec 19, 2024 · Common Stock, par value $0.01 per share · reported falling below 5%
under 5%
What AMTM reports owning in othersstakes of 5% or more, and other ties
Other ties the annual report names
Joint Venture Prior to Acquisition
An investee · investee · invested in, named in the 10-K filed Nov 25, 2025
Cms
A company bought · acquisition · owns, named in the 10-K filed Nov 25, 2025

180 subsidiaries in 29 countries, from the list filed with the 10-K filed Nov 25, 2025.

Insider tradesForm 4
0sales
0purchases
0sales on a scheduled plan
0people selling
$0sold, in dollars
$0bought, in dollars
Open-market trades on Form 4 from Nov 10, 2025 to Nov 10, 2026. A scheduled plan is a selling program set in advance under SEC rule 10b5-1. The trades are listed as filed and do not feed the grade.
By calendar yearSoldBought
25
2025 runs to Nov 10, 2026. Dollars as filed, summed by the transaction date.
People who traded in the window
No one on the roster filed an open-market trade in the window.
SI Assistanton AMTM · research, not advice