Amentum Holdings, Inc.
AMTM- Exchange
- NYSE
- Industry
- Services-Business Services, NEC
- SEC CIK
- 0002011286
No open-market purchases or sales by Amentum Holdings, Inc. insiders were filed in the last 90 days; 465 institutions reported holding it in 13F filings for Q2 2026, worth $4.34B in total; Soros Fund Management is the only superinvestor holding it.
Holders of 5% or more of AMTM
Holders whose latest Schedule 13D or 13G filing reports 5% or more of Amentum Holdings, Inc., largest stake first. The change is against the holder's previous filing.
| Holder | Latest form | Stake | Change | First filed | Latest filing | Filing |
|---|---|---|---|---|---|---|
| ASP Manager Corp. | 13D | 18.04%43.9M shares | New | Dec 23, 20241 filing | Dec 23, 2024 | SEC |
| Goldberg Alan E | 13D | 18.00%43.9M shares | New | Dec 23, 20241 filing | Dec 23, 2024 | SEC |
| Invesco Ltd. | 13G/A | 10.10%24.5M shares | +1.00 ppfrom 9.10% | Feb 7, 20254 filings | May 7, 2026 | SEC |
| BlackRock, Inc. | 13G/A | 6.90%16.8M shares | – | Oct 24, 20243 filings | Feb 5, 2025 | SEC |
| Primecap Management Co | 13G | 5.03%12.3M shares | New | Aug 6, 20261 filing | Aug 6, 2026 | SEC |
Stakes are as of each holder's latest filing. Holders whose last filing was in the old format (before December 18, 2024) have no stake on record and are not listed, and after an acquisition or delisting holders usually stop filing.
13D and 13G filings
18 Schedule 13D and 13G filings on Amentum Holdings, Inc., newest first, including old-format filings without a stake.
| Filed (ET) | Filer | Form | Stake | Change | Event date | Filing |
|---|---|---|---|---|---|---|
| Aug 6, 20265:16 PM ET | Primecap Management Co | 13G | 5.03%12.3M shares | New | Jun 30, 2026 | SEC |
| May 7, 202611:41 AM ET | Invesco Ltd. | 13G/A | 10.10%24.5M shares | +1.00 ppfrom 9.10% | Apr 30, 2026 | SEC |
| Mar 26, 20263:25 PM ET | Vanguard Group Inc | 13G/A | 0.00%0 shares | −6.79 ppfrom 6.79%Below 5% | Mar 13, 2026 | SEC |
| Nov 6, 20254:25 PM ET | Invesco Ltd. | 13G/A | 9.10%22.1M shares | +2.00 ppfrom 7.10% | Sep 30, 2025 | SEC |
| May 9, 20251:39 PM ET | Invesco Ltd. | 13G/A | 7.10%17.2M shares | +1.40 ppfrom 5.70% | Mar 31, 2025 | SEC |
| Mar 13, 20257:51 PM ET | Jacobs Solutions Inc.and 1 other | 13G/A | 0.00%0 shares | –Below 5% | Mar 13, 2025 | SEC |
| Feb 7, 20251:14 PM ET | Invesco Ltd. | 13G | 5.70%13.9M shares | New | Dec 31, 2024 | SEC |
| Feb 5, 20255:28 PM ET | BlackRock, Inc. | 13G/A | 6.90%16.8M shares | – | Dec 31, 2024 | SEC |
| Jan 30, 20258:09 PM ET | Vanguard Group Inc | 13G/A | 6.79%16.5M shares | – | Dec 31, 2024 | SEC |
| Dec 23, 20247:03 PM ET | Goldberg Alan Eand 16 others | 13D | 18.00%43.9M shares | New | Dec 17, 2024 | SEC |
| Dec 23, 20246:03 PM ET | ASP Manager Corp.and 2 others | 13D | 18.04%43.9M shares | New | Dec 17, 2024 | SEC |
| Dec 19, 20246:05 PM ET | Amentum Joint Venture LPand 1 other | 13D/A | 0.00%0 shares | –Below 5% | Dec 17, 2024 | SEC |
| Nov 12, 2024 | BlackRock, Inc. | 13GOld format | – | – | – | SEC |
| Nov 12, 2024 | Jacobs Solutions Inc. | 13GOld format | – | New | – | SEC |
| Nov 12, 2024 | Vanguard Group Inc | 13G/AOld format | – | – | – | SEC |
| Nov 4, 2024 | Vanguard Group Inc | 13G/AOld format | – | – | – | SEC |
| Oct 24, 2024 | BlackRock, Inc. | 13GOld format | – | New | – | SEC |
| Oct 4, 2024 | Amentum Joint Venture LP | 13DOld format | – | New | – | SEC |
Form 144: proposed insider sales
Notices from officers, directors and other affiliates planning to sell Amentum Holdings, Inc. shares.
No Form 144 notices for Amentum Holdings, Inc. are on file.