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AMTM

Amentum Holdings
AMTM

462 hedge funds and large institutions have $4.63B invested in Amentum Holdings in 2025 Q3 according to their latest regulatory filings, with 76 funds opening new positions, 104 increasing their positions, 179 reducing their positions, and 69 closing their positions.

New
Increased
Maintained
Reduced
Closed

49% more call options, than puts

Call options by funds: $22.9M | Put options by funds: $15.4M

10% more first-time investments, than exits

New positions opened: 76 | Existing positions closed: 69

0% more funds holding

Funds holding: 460 → 462 (+2)

0% more funds holding in top 10

Funds holding in top 10: 9 → 9 (0)

2% less capital invested

Capital invested by funds: $4.73B → $4.63B (-$98.4M)

2.85% less ownership

Funds ownership: 82.34% → 79.49% (-2.8%)

42% less repeat investments, than reductions

Existing positions increased: 104 | Existing positions reduced: 179

Holders
462
Holders Change
+2
Holders Change %
+0.43%
% of All Funds
6.06%
Holding in Top 10
9
Holding in Top 10 Change
–
Holding in Top 10 Change %
–
% of All Funds
0.12%
New
76
Increased
104
Reduced
179
Closed
69
Calls
$22.9M
Puts
$15.4M
Net Calls
+$7.56M
Net Calls Change
-$17.7M

Top Buyers

1
Invesco
Invesco
Georgia
+$61.8M
2
Fidelity Investments
Fidelity Investments
Massachusetts
+$40.4M
3
Verition Fund Management
Verition Fund Management
Connecticut
+$25.4M
4
Point72 Asset Management
Point72 Asset Management
Connecticut
+$25.1M
5
Mirae Asset Global ETFs Holdings
Mirae Asset Global ETFs Holdings
Hong Kong
+$17.1M

Top Sellers

1
Millennium Management
Millennium Management
New York
-$98M
2
VanEck Associates
VanEck Associates
New York
-$56.1M
3
DCM
Discovery Capital Management
Connecticut
-$28.2M
4
BlackRock
BlackRock
New York
-$24.5M
5
Vanguard Group
Vanguard Group
Pennsylvania
-$23.8M
Name Holding Trade Value Shares
Change 		Change in
Stake
AS
1
American Securities
New York
$1.08B – – –
Invesco
2
Invesco
Georgia
$530M +$61.8M +2,539,594 +13%
BlackRock
3
BlackRock
New York
$431M -$24.5M -1,004,634 -5%
Vanguard Group
4
Vanguard Group
Pennsylvania
$373M -$23.8M -979,134 -6%
Primecap Management
5
Primecap Management
California
$285M -$2.73M -112,070 -0.9%
State Street
6
State Street
Massachusetts
$164M -$5.96M -244,873 -3%
Fidelity Investments
7
Fidelity Investments
Massachusetts
$149M +$40.4M +1,661,319 +36%
FCM
8
Frontier Capital Management
Massachusetts
$125M -$6.28M -258,063 -5%
Kovitz Investment Group Partners
9
Kovitz Investment Group Partners
Illinois
$72M +$172K +7,080 +0.2%
TSW
10
Thompson Siegel & Walmsley
Virginia
$65.4M -$1.38M -56,615 -2%
Geode Capital Management
11
Geode Capital Management
Massachusetts
$63.6M +$3.43M +141,023 +6%
RCG
12
Ruane, Cunniff & Goldfarb
New York
$58M -$438K -17,995 -0.7%
Mirae Asset Global ETFs Holdings
13
Mirae Asset Global ETFs Holdings
Hong Kong
$49.9M +$17.1M +701,859 +51%
FGP
14
Freestone Grove Partners
California
$49.1M – – –
Charles Schwab
15
Charles Schwab
California
$44.1M +$2.37M +97,158 +6%
Morgan Stanley
16
Morgan Stanley
New York
$43.3M -$9.03M -370,805 -17%
Thrivent Financial for Lutherans
17
Thrivent Financial for Lutherans
Minnesota
$43.2M +$2.88M +118,306 +7%
ACM
18
Arvin Capital Management
Texas
$39.2M -$12.2M -502,942 -24%
Fidelity International
19
Fidelity International
Bermuda
$37.3M -$12.4M -508,181 -25%
Point72 Asset Management
20
Point72 Asset Management
Connecticut
$33.1M +$25.1M +1,030,364 +294%
Dimensional Fund Advisors
21
Dimensional Fund Advisors
Texas
$31.3M -$699K -28,701 -2%
6CM
22
683 Capital Management
New York
$30.5M -$8.64M -355,000 -22%
BCM
23
Brightline Capital Management
Florida
$28.7M +$4.87M +200,000 +20%
DCM
24
Discovery Capital Management
Connecticut
$27.3M -$28.2M -1,160,018 -50%
Verition Fund Management
25
Verition Fund Management
Connecticut
$27.2M +$25.4M +1,043,145 +1,128%
1
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AMTM Hedge Fund Activity: Q3 2025 in Review

462 of the 7,619 institutional investors tracked by Wall St. Rank reported a position in Amentum Holdings (AMTM) for Q3 2025, worth a combined $4.63B — down 2.1% from $4.73B a quarter earlier.

Buyers outnumbered sellers: 76 funds opened new AMTM positions and 69 closed out — a net gain of 7 holders — while 104 added to existing stakes and 179 trimmed.

The largest buyer was Invesco, adding an estimated $61.8M. The largest seller was Millennium Management, cutting an estimated $98M.

  • 462 institutional investors held Amentum Holdings (AMTM) as of Q3 2025, up from 460 in Q2 2025.
  • Funds reported $4.63B of Amentum Holdings stock for Q3 2025, down 2.1% quarter-over-quarter.
  • 76 funds opened new Amentum Holdings positions in Q3 2025 and 69 closed out, a net change of +7 holders.
  • The largest Amentum Holdings buyer in Q3 2025 was Invesco, an estimated $61.8M added.
  • The largest Amentum Holdings seller in Q3 2025 was Millennium Management, an estimated $98M sold.

Based on aggregated 13F filings for Q3 2025.