Companies / Amentum Holdings, Inc. / Activity

Activity — Amentum Holdings, Inc.

21 moves.

Top impactInsider · CEO movesInsider · biggest buysInsider · biggest sellsInstitution · biggest movesInstitution · new positions
InsidersInstitutions
DateActorActionSecurityValueShares ΔPosition afterImpact
Q2 2026
as of
Mawer Investment Management Ltd.
13F manager
NewCommon stock$7.64M+370K
369,557
0.15% of shares
medium
Q4 2025
as of
First National Bank of Omaha
13F manager
NewCommon stock$5.21M+178K
177,700
0.07% of shares
medium
Q3 2024
as of
Barclays PLC
13F manager
NewCommon stock$5.15M+160K
159,813
0.07% of shares
medium
Q1 2026
as of
Wedge Capital Management L L P/NC
13F manager
NewCommon stock$4.29M+165K
164,666
0.07% of shares
low
Q1 2026
as of
D. E. Shaw & Co., Inc.
13F manager
NewCommon stock$1.73M+66K
66,171
0.03% of shares
low
Q4 2025
as of
Steadtrust LLC
13F manager
NewCommon stock$1.46M+50K
50,400
0.02% of shares
low
Q1 2026
as of
Walleye Trading LLC
13F manager
NewCommon stock$744.5K+29K
28,548
0.01% of shares
low
Q1 2026
as of
Oppenheimer Asset Management Inc.
13F manager
NewCommon stock$734.3K+28K
28,154
0.01% of shares
low
Q4 2025
as of
Oxford Asset Management LLP
13F manager
NewCommon stock$540.2K+19K
18,629
<0.01% of shares
low
Q1 2026
as of
Aristeia Capital, L.L.C.
13F manager
NewCommon stock$537.4K+21K
20,605
<0.01% of shares
low
Q3 2024
as of
Chesapeake Asset Management LLC
13F manager
NewCommon stock$473.2K+15K
14,673
<0.01% of shares
low
Q3 2024
as of
Ontario Teachers Pension Plan Board
13F manager
NewCommon stock$298.4K+9K
9,254
<0.01% of shares
low
Q1 2026
as of
Alpine Woods Capital Investors, LLC
13F manager
NewCommon stock$219.1K+8K
8,402
<0.01% of shares
low
Q4 2025
as of
Danske Bank A/S
13F manager
NewCommon stock$114.9K+4K
3,962
<0.01% of shares
low
Q1 2026
as of
Peak6 LLC
13F manager
NewCommon stock$72.6K+3K
2,783
<0.01% of shares
low
Q3 2024
as of
Ransom Advisory, Ltd
13F manager
NewCommon stock$16.1K+500
500
<0.01% of shares
low
Q2 2025
as of
Virtus Advisers, LLC
13F manager
NewCommon stock$2.9K+121
121
<0.01% of shares
low
Q2 2026
as of
Harbor Capital Advisors, Inc.
13F manager
NewCommon stock$816+40K
39,501
0.02% of shares
low
Q3 2024
as of
Leonteq Securities AG
13F manager
NewCommon stock$710+22
22
<0.01% of shares
low
Q3 2024
as of
Prestige Wealth Management Group LLC
13F manager
NewCommon stock$452+14
14
<0.01% of shares
low
Q1 2026
as of
Janney Montgomery Scott LLC
13F manager
NewCommon stock$332+13K
12,728
<0.01% of shares
low
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