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; 464 institutions reported holding it in 13F filings for Q2 2026, worth $4.34B in total; Soros Fund Management is the only superinvestor holding it.
Q2 2025 vs. Q1 2025
How the institutions holding Amentum Holdings, Inc. changed between Q1 2025 and Q2 2025.
All holders in Q2 2025All holders in Q1 2025
| Measure | Q1 2025 | Of which not filed for Q2 2025 | Q2 2025 | Change |
|---|---|---|---|---|
| Holders | 418 | 5 | 461 | +48 |
| Shares | 191.7M | 195.9K | 200.3M | +8.87M (+4.6%) |
| Value | $3.49B | $3.57M | $4.73B | +$1.25B (+35.7%) |
5 institutions that held it in Q1 2025 haven't filed for Q2 2025 yet. Not filing isn't selling, so the changes leave them out.
New holders (113)
Institutions that held Amentum Holdings, Inc. at the end of Q2 2025 but not at the end of Q1 2025.
Showing the largest 100 of 113 by value.
Sold out (65)
Institutions that held Amentum Holdings, Inc. at the end of Q1 2025 and filed for Q2 2025 without it.
Not filed for Q2 2025 yet (5)
Institutions that held Amentum Holdings, Inc. at the end of Q1 2025 and haven't filed a 13F for Q2 2025. Not filing isn't selling, so they aren't counted as sold out.
| Institution | Shares, Q1 2025 | Value, Q1 2025 |
|---|---|---|
| Keeley-Teton Advisors, LLC | 128,081 | $2.33M |
| Kodai Capital Management LP | 65,540 | $1.19M |
| Sandy Spring Bank | 2,004 | $36.5K |
| Lindbrook Capital, LLC | 251 | $4.57K |
| Sofos Investments, Inc. | 23 | $419 |