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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
IMRF
101
Illinois Municipal Retirement Fund
Illinois
$1.98M +$175K +7,176 +10%
BMCM
102
Bryn Mawr Capital Management
Pennsylvania
$1.91M +$168K +6,915 +10%
CAG
103
Crestwood Advisors Group
Massachusetts
$1.86M -$103K -4,242 -5%
SOADOR
104
State of Alaska Department of Revenue
Alaska
$1.85M -$309K -12,696 -14%
Citigroup
105
Citigroup
New York
$1.84M -$1.29M -53,155 -41%
OC
106
Oppenheimer & Co
New York
$1.81M +$1.61M +66,320 +724%
AGM
107
Alpine Global Management
New York
$1.8M -$1.36K -56 -0.1%
PVI
108
Pine Valley Investments
New Jersey
$1.77M +$708K +29,079 +65%
PFSRSONJ
109
Police & Firemen's Retirement System of New Jersey
New Jersey
$1.72M +$274K +11,257 +19%
Treasurer of the State of North Carolina
110
Treasurer of the State of North Carolina
North Carolina
$1.71M -$67.9K -2,787 -4%
LSERS
111
Louisiana State Employees Retirement System
Louisiana
$1.69M – – –
Janus Henderson Group
112
Janus Henderson Group
United Kingdom
$1.66M – – –
CSS
113
Cubist Systematic Strategies
Connecticut
$1.64M +$1.67M +68,478 New
WAM
114
Wolverine Asset Management
Illinois
$1.63M – – –
Natixis Advisors
115
Natixis Advisors
Massachusetts
$1.6M -$10.1K -413 -0.6%
HCM
116
Hahn Capital Management
California
$1.57M -$72.7K -2,986 -4%
QCM
117
Quantinno Capital Management
New York
$1.56M +$329K +13,508 +26%
State of Tennessee, Department of Treasury
118
State of Tennessee, Department of Treasury
Tennessee
$1.55M +$55.2K +2,268 +4%
SDIC
119
South Dakota Investment Council
South Dakota
$1.54M +$1.57M +64,420 New
SFI
120
Susquehanna Fundamental Investments
Pennsylvania
$1.3M +$1.32M +54,337 New
Teacher Retirement System of Texas
121
Teacher Retirement System of Texas
Texas
$1.29M -$264K -10,844 -17%
Barclays
122
Barclays
United Kingdom
$1.29M +$108K +4,423 +9%
WG
123
Winton Group
United Kingdom
$1.28M -$1.44M -59,012 -52%
Ohio Public Employees Retirement System (OPERS)
124
Ohio Public Employees Retirement System (OPERS)
Ohio
$1.23M +$779 +32 +0.1%
William Blair & Company
125
William Blair & Company
Illinois
$1.21M -$144K -5,919 -10%
3 4
5
6 7

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.