Amentum Holdings
AMTM
460 hedge funds and large institutions have $4.73B invested in Amentum Holdings in 2025 Q2 according to their latest regulatory filings, with 111 funds opening new positions, 234 increasing their positions, 100 reducing their positions, and 65 closing their positions.
134% more repeat investments, than reductions
Existing positions increased: 234 | Existing positions reduced: 100
81% more call options, than puts
Call options by funds: $56.6M | Put options by funds: $31.3M
80% more funds holding in top 10
Funds holding in top 10: 5 → 9 (+4)
71% more first-time investments, than exits
New positions opened: 111 | Existing positions closed: 65
36% more capital invested
Capital invested by funds: $3.49B → $4.73B (+$1.24B)
10% more funds holding
Funds holding: 419 → 460 (+41)
3.53% more ownership
Funds ownership: 78.8% → 82.34% (+3.5%)
Top Buyers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
Millennium Management
New York
|
+$55.5M |
| 2 |
Invesco
Atlanta,
Georgia
|
+$49.9M |
| 3 |
Primecap Management
Pasadena,
California
|
+$41.2M |
| 4 |
FCM
Frontier Capital Management
Boston,
Massachusetts
|
+$39.3M |
| 5 |
Mirae Asset Global ETFs Holdings
Causeway Bay,
Hong Kong
|
+$28.8M |
Top Sellers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
Citadel Advisors
Miami,
Florida
|
-$54M |
| 2 |
Balyasny Asset Management
Chicago,
Illinois
|
-$34.2M |
| 3 |
CCPM
Cooper Creek Partners Management
New York
|
-$22.3M |
| 4 |
VC
Voss Capital
Houston,
Texas
|
-$17.2M |
| 5 |
UBS Group
Zurich,
Switzerland
|
-$16M |
AMTM Hedge Fund Activity: Q2 2025 in Review
460 of the 7,595 institutional investors tracked by Wall St. Rank reported a position in Amentum Holdings (AMTM) for Q2 2025, worth a combined $4.73B — up 36% from $3.49B a quarter earlier.
Buyers outnumbered sellers: 111 funds opened new AMTM positions and 65 closed out — a net gain of 46 holders — while 234 added to existing stakes and 100 trimmed.
The largest buyer was Millennium Management, adding an estimated $55.5M. The largest seller was Citadel Advisors, cutting an estimated $54M.
- 460 institutional investors held Amentum Holdings (AMTM) as of Q2 2025, up from 419 in Q1 2025.
- Funds reported $4.73B of Amentum Holdings stock for Q2 2025, up 36% quarter-over-quarter.
- 111 funds opened new Amentum Holdings positions in Q2 2025 and 65 closed out, a net change of +46 holders.
- The largest Amentum Holdings buyer in Q2 2025 was Millennium Management, an estimated $55.5M added.
- The largest Amentum Holdings seller in Q2 2025 was Citadel Advisors, an estimated $54M sold.
Based on aggregated 13F filings for Q2 2025.