Amentum Holdings
AMTM
460 hedge funds and large institutions have $4.34B invested in Amentum Holdings in 2026 Q2 according to their latest regulatory filings, with 59 funds opening new positions, 145 increasing their positions, 159 reducing their positions, and 74 closing their positions.
125% more call options, than puts
Call options by funds: $49.7M | Put options by funds: $22.2M
3.04% more ownership
Funds ownership: 86.52% → 89.56% (+3%)
9% less repeat investments, than reductions
Existing positions increased: 145 | Existing positions reduced: 159
6% less funds holding
Funds holding: 487 → 460 (-27)
18% less capital invested
Capital invested by funds: $5.28B → $4.34B (-$934M)
20% less first-time investments, than exits
New positions opened: 59 | Existing positions closed: 74
56% less funds holding in top 10
Funds holding in top 10: 9 → 4 (-5)
Top Buyers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
Invesco
Atlanta,
Georgia
|
+$84.2M |
| 2 |
TCA
Troluce Capital Advisors
Dorado,
Puerto Rico
|
+$62M |
| 3 |
Dimensional Fund Advisors
Austin,
Texas
|
+$42.3M |
| 4 |
Goldman Sachs
New York
|
+$38.2M |
| 5 |
Millennium Management
New York
|
+$36.2M |
Top Sellers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
Focus Partners Wealth
Boston,
Massachusetts
|
-$59.7M |
| 2 |
Toronto Dominion Bank
Toronto, Ontario,
Ontario, Canada
|
-$40.8M |
| 3 |
ACM
Arvin Capital Management
Austin,
Texas
|
-$40M |
| 4 |
BCM
Brightline Capital Management
Miami,
Florida
|
-$36.4M |
| 5 |
RCG
Ruane, Cunniff & Goldfarb
New York
|
-$26.3M |
AMTM Hedge Fund Activity: Q2 2026 in Review
460 of the 8,305 institutional investors tracked by Wall St. Rank reported a position in Amentum Holdings (AMTM) for Q2 2026, worth a combined $4.34B — down 18% from $5.28B a quarter earlier.
Sellers outnumbered buyers: 74 funds closed out of AMTM and 59 opened new positions — a net loss of 15 holders — while 159 trimmed existing stakes and 145 added.
The largest buyer was Invesco, adding an estimated $84.2M. The largest seller was Focus Partners Wealth, cutting an estimated $59.7M.
- 460 institutional investors held Amentum Holdings (AMTM) as of Q2 2026, down from 487 in Q1 2026.
- Funds reported $4.34B of Amentum Holdings stock for Q2 2026, down 18% quarter-over-quarter.
- 59 funds opened new Amentum Holdings positions in Q2 2026 and 74 closed out, a net change of -15 holders.
- The largest Amentum Holdings buyer in Q2 2026 was Invesco, an estimated $84.2M added.
- The largest Amentum Holdings seller in Q2 2026 was Focus Partners Wealth, an estimated $59.7M sold.
Based on aggregated 13F filings for Q2 2026.