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Amentum Holdings, Inc.

AMTM
Exchange
NYSE
Industry
Services-Business Services, NEC
SEC CIK
0002011286

No open-market purchases or sales by Amentum Holdings, Inc. insiders were filed in the last 90 days; 464 institutions reported holding it in 13F filings for Q2 2026, worth $4.34B in total; Soros Fund Management is the only superinvestor holding it.

Q4 2025 vs. Q3 2025

How the institutions holding Amentum Holdings, Inc. changed between Q3 2025 and Q4 2025.

All holders in Q4 2025All holders in Q3 2025

13F holders of AMTM: Q3 2025 compared with Q4 2025
MeasureQ3 2025Of which not filed for Q4 2025Q4 2025Change
Holders46210483+31
Shares193.4M266.3K203.8M+10.7M (+5.5%)
Value$4.63B$6.17M$5.64B+$1.01B (+21.9%)

10 institutions that held it in Q3 2025 haven't filed for Q4 2025 yet. Not filing isn't selling, so the changes leave them out.

New holders (88)

Institutions that held Amentum Holdings, Inc. at the end of Q4 2025 but not at the end of Q3 2025.

Institutions new to AMTM in Q4 2025
InstitutionSharesValue% of portfolio
Norges Bank2,294,097$66.5M0.01%
Cooper Creek Partners Management LLC1,553,074$45.0M2.13%
Legacy Advisors, LLC9,814,289$9.81M1.05%
OpenArc Corporate Advisory, LLC200,325$5.81M0.10%
First National Bank of Omaha177,700$5.21M0.15%
Qube Research & Technologies Ltd146,182$4.24M0.01%
Soros Fund Management LLCSuperinvestorSoros Fund Management109,303$3.17M0.04%
Ridge Creek Global, Inc70,888$2.06M1.72%
Resolute Capital Asset Partners LLC70,000$2.03M0.98%
Steadtrust LLC50,400$1.46M0.90%
Delphi Management Inc49,094$1.42M1.39%
Ieq Capital, LLC38,025$1.10M0.00%
Capital Fund Management S.A.36,812$1.07M0.01%
Marshall Wace, LLP35,084$1.02M0.00%
Brevan Howard Capital Management LP35,018$1.02M0.02%
Landscape Capital Management, L.L.C.32,981$956.4K0.06%
Oak Thistle LLC32,956$955.7K0.13%
Dba Trading, LLC31,196$904.7K0.90%
Magnetar Financial LLC20,875$605.4K0.01%
Old West Investment Management, LLC19,355$561.3K0.10%
Legal Advantage Investments, Inc.18,900$548.1K0.25%
Oxford Asset Management LLP18,629$540.2K0.19%
Bridgewater Associates, LP18,251$529.3K0.00%
Aso Group Ltd17,724$514.0K0.20%
Impact Partnership Wealth, LLC16,314$473.1K0.06%
Gryphon Financial Partners LLC16,285$472.3K0.05%
Profund Advisors LLC15,771$457.4K0.01%
Mackenzie Financial Corp15,479$452.6K0.00%
Mercer Global Advisors Inc15,502$452.6K0.00%
LuminArx Capital Management LP15,000$435.0K0.42%
Marex Group plc13,002$377.1K0.00%
Caldwell Investment Management Ltd.11,669$341.7K0.21%
Penserra Capital Management LLC11,268$326.0K0.00%
Y-Intercept (Hong Kong) Ltd10,497$304.4K0.01%
Symmetry Investments LP10,000$290.0K0.05%
Virginia Retirement Systems Et Al9,600$278.4K0.00%
Guggenheim Capital LLC9,439$273.7K0.00%
CAPROCK Group, Inc.9,310$270.0K0.01%
Comprehensive Financial Planning, Inc.8,830$256.1K0.17%
Xponance, Inc.8,438$244.7K0.00%
Concurrent Investment Advisors, LLC8,382$243.1K0.00%
Utah Retirement Systems8,339$241.8K0.00%
Janney Capital Management LLC8,306$241.0K0.02%
Wexford Capital LP8,251$239.3K0.06%
Acadian Asset Management LLC8,199$237.0K0.00%
FRG Family Wealth Advisors LLC7,864$228.1K0.04%
Mirabella Financial Services LLP7,806$226.4K0.02%
Keybank National Association7,689$223.0K0.00%
Machina Capital S.A.S.7,483$217.0K0.04%
Summit Trail Advisors, LLC7,444$215.9K0.00%
Sage Rhino Capital LLC7,336$212.7K0.04%
Fox Run Management, L.L.C.7,248$210.2K0.03%
Boothbay Fund Management, LLC7,214$209.2K0.01%
Formidable Asset Management, LLC7,163$207.7K0.03%
Swiss Life Asset Management Ltd7,085$205.5K0.00%
United Capital Financial Advisers, LLC6,952$201.6K0.00%
Danske Bank A/S3,962$114.9K0.00%
Kestra Advisory Services, LLC3,690$107.0K0.00%
Pinnacle Wealth Planning Services, Inc.2,384$69.1K0.01%
Atlas Capital Advisors LLC1,662$48.2K0.01%
Financial Consulate, Inc1,300$37.7K0.01%
Keating Financial Advisory Services, Inc.802$23.3K0.00%
Los Angeles Capital Management LLC893$19.6K0.00%
Flagship Harbor Advisors, LLC626$18.2K0.00%
Sfam, LLC487$14.1K0.01%
Basecamp Wealth Advisors LLC399$11.6K0.00%
Laurel Wealth Advisors LLC275$7.97K0.00%
Torren Management, LLC243$7.05K0.00%
DV Trading LLC188$5.45K0.00%
Elevated Capital Advisors, LLC177$5.13K0.00%
Garton & Associates Financial Advisors LLC107$3.10K0.00%
Arlington Trust Co LLC100$2.90K0.00%
Meramec Financial Planners, LLC61$2.29K0.00%
Proathlete Wealth Management LLC64$1.86K0.00%
Nvest Wealth Strategies, Inc.37$1.07K0.00%
MidFirst Bank33$9570.00%
Ankerstar Wealth, LLC25$7250.00%
SJS Investment Consulting Inc.15$4350.00%
Gilpin Wealth Management, LLC12$3480.00%
Elyxium Wealth, LLC11$3190.00%
Fairway Wealth LLC10$2900.00%
Three Bearings Fiduciary Advisors, Inc.8$2870.00%
Whipplewood Advisors, LLC7$2030.00%
Wilkerson Advisory Group LLC4$1160.00%
Kingdom Financial Group LLC.2$580.00%
Union Savings Bank2$580.00%
Signature Equity Partners, LLC2$580.00%
SageView Advisory Group, LLC1$290.00%

Sold out (57)

Institutions that held Amentum Holdings, Inc. at the end of Q3 2025 and filed for Q4 2025 without it.

Institutions that sold out of AMTM in Q4 2025
InstitutionShares, Q3 2025Value, Q3 2025
Kovitz Investment Group Partners, LLC3,007,750$72.0M
Freestone Grove Partners LP2,051,859$49.1M
Discovery Capital Management, LLC1,139,112$27.3M
Voss Capital, LLC625,000$15.0M
BW Gestao de Investimentos Ltda.511,477$12.2M
Trexquant Investment LP255,748$6.13M
HRT Financial LP186,223$4.46M
Engineers Gate Manager LP125,542$3.01M
Dark Forest Capital Management LP95,866$2.30M
Illinois Municipal Retirement Fund82,628$1.98M
Oppenheimer & Co Inc75,483$1.81M
Tudor Investment Corp Et Al49,133$1.18M
Kerrisdale Advisers, LLC39,520$946.5K
EntryPoint Capital, LLC38,211$915.2K
Massar Capital Management, LP33,183$794.7K
Sciencast Management LP29,673$710.7K
Susquehanna International Group, LLP26,467$633.9K
Iat Reinsurance Co Ltd.24,693$591.4K
Lecap Asset Management Ltd23,438$561.3K
Gsa Capital Partners LLP23,285$558.0K
Counterpoint Mutual Funds LLC21,913$524.8K
DRW Securities, LLC20,061$478.8K
IMC-Chicago, LLC19,237$460.7K
Entropy Technologies, LP14,570$349.0K
Oppenheimer Asset Management Inc.12,116$290.2K
Commerce Bank11,534$276.2K
Quantessence Capital LLC10,879$260.6K
ISAM Funds (UK) Ltd10,848$259.8K
Prelude Capital Management, LLC10,449$250.3K
FourThought Financial Partners, LLC9,379$224.6K
Coastal Bridge Advisors, LLC8,505$203.7K
Optiver Holding B.V.7,954$190.5K
Aster Capital Management (DIFC) Ltd2,931$70.2K
Advisory Services Network, LLC2,542$60.9K
Plante Moran Financial Advisors, LLC1,990$47.7K
Heartwood Wealth Advisors LLC1,892$45.3K
Wealthspire Advisors, LLC1,734$41.5K
Mather Group, LLC.1,349$32.3K
Natixis423$10.1K
GPS Wealth Strategies Group, LLC133$3.19K
TruNorth Capital Management, LLC106$2.54K
Ameritas Advisory Services, LLC88$2.11K
First Financial Corp79$1.89K
RMG Wealth Management LLC43$970
Atlantic Trust, LLC40$958
Deseret Mutual Benefit Administrators36$862
Principal Securities, Inc.33$790
Contravisory Investment Management, Inc.27$647
Logan Capital Management Inc24$575
Trust Co20$479
Johnson Financial Group, Inc.19$456
Trust Co of Vermont18$431
Horizon Investments, LLC16$383
Virtus ETF Advisers LLC12$287
Strengthening Families & Communities, LLC3$71
Dynamic Wealth Strategies, LLC1$24
Activest Wealth Management1$24

Not filed for Q4 2025 yet (10)

Institutions that held Amentum Holdings, Inc. at the end of Q3 2025 and haven't filed a 13F for Q4 2025. Not filing isn't selling, so they aren't counted as sold out.

Institutions holding AMTM in Q3 2025 that haven't filed for Q4 2025
InstitutionShares, Q3 2025Value, Q3 2025
Country Club Bank172,462$3.94M
Cubist Systematic Strategies, LLC68,478$1.64M
Wolverine Trading, LLC12,469$284.5K
Point72 Asia (Singapore) Pte. Ltd.9,181$219.9K
Point72 Hong Kong Ltd2,469$59.1K
West Oak Capital, LLC696$16.7K
Optimum Investment Advisors372$8.91K
Hemington Wealth Management135$3.00K
Creekmur Asset Management LLC34$814
Binnacle Investments Inc10$240