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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.

Q1 2026 vs. Q4 2025

How the institutions holding Amentum Holdings, Inc. changed between Q4 2025 and Q1 2026.

All holders in Q1 2026All holders in Q4 2025

13F holders of AMTM: Q4 2025 compared with Q1 2026
MeasureQ4 2025Of which not filed for Q1 2026Q1 2026Change
Holders4837486+10
Shares203.8M18.0M211.1M+25.3M (+13.6%)
Value$5.64B$522.6M$5.28B+$162.1M (+3.2%)

7 institutions that held it in Q4 2025 haven't filed for Q1 2026 yet. Not filing isn't selling, so the changes leave them out.

New holders (70)

Institutions that held Amentum Holdings, Inc. at the end of Q1 2026 but not at the end of Q4 2025.

Institutions new to AMTM in Q1 2026
InstitutionSharesValue% of portfolio
Vanguard Portfolio Management LLC7,852,951$204.8M0.01%
Vanguard Capital Management LLC6,650,879$173.5M0.00%
Permian Investment Partners, LP1,567,000$40.9M4.52%
Toronto Dominion Bank1,565,223$40.8M0.08%
Troluce Capital Advisors LLC1,000,000$26.1M2.76%
Vanguard Fiduciary Trust Co947,460$24.7M0.01%
De Lisle Partners LLP379,818$9.90M1.18%
Mawer Investment Management Ltd.333,790$8.71M0.06%
Susquehanna International Group, LLP330,049$8.61M0.01%
Rovida Investment Management Ltd315,000$8.21M1.03%
Hel Ved Capital Management Ltd178,500$4.66M0.81%
Oppenheimer & Co Inc168,872$4.40M0.05%
Wedge Capital Management L L P164,666$4.29M0.08%
Vanguard Asset Management, Ltd127,793$3.33M0.00%
Strategic Global Advisors, LLC95,718$2.50M0.40%
Illinois Municipal Retirement Fund83,407$2.18M0.03%
D. E. Shaw & Co., Inc.66,171$1.73M0.00%
Vanguard Global Advisers, LLC61,388$1.60M0.00%
K2 Principal Fund, L.P.60,000$1.56M0.17%
Maverick Capital LtdSuperinvestorMaverick Capital46,335$1.21M0.01%
Vanguard Investments Australia, Ltd.39,488$1.03M0.00%
Kerrisdale Advisers, LLC29,190$761.3K0.29%
Walleye Trading LLC28,548$744.5K0.02%
Oppenheimer Asset Management Inc.28,154$734.3K0.01%
Entropy Technologies, LP26,895$701.4K0.03%
Massar Capital Management, LP21,056$549.1K0.11%
Aristeia Capital LLC20,605$537.4K0.01%
Moran Wealth Management, LLC19,585$510.8K0.02%
Allstate Corp19,471$507.8K0.01%
Guidance Capital, Inc19,471$473.5K0.11%
EntryPoint Capital, LLC17,978$468.9K0.14%
Aigen Investment Management, LP16,916$441.2K0.11%
Heritage Wealth Advisors16,349$426.4K0.02%
First National Advisers, LLC12,742$332.3K0.05%
Janney Montgomery Scott LLC12,728$332.0K0.00%
Lighthouse Investment Partners, LLC12,099$315.5K0.01%
Weatherly Asset Management L. P.9,690$252.7K0.02%
IHT Wealth Management, LLC9,537$248.7K0.01%
DZ BANK AG Deutsche Zentral Genossenschafts Bank, Frankfurt am Main9,500$247.8K0.00%
DRW Securities, LLC9,412$245.5K0.01%
AE Wealth Management LLC9,240$241.0K0.00%
Vann Equity Management LLC9,018$235.2K0.17%
Alpine Woods Capital Investors, LLC8,402$219.1K0.05%
Empowered Funds, LLC7,900$206.0K0.00%
Strategic Equity Management7,844$204.6K0.08%
Horizon Investments, LLC3,723$97.1K0.00%
Caitong International Asset Management Co., Ltd2,937$76.6K0.01%
PEAK6 LLC2,783$72.6K0.00%
Advisory Services Network, LLC2,586$67.4K0.00%
Newbridge Financial Services Group, Inc.1,350$35.2K0.01%
Mather Group, LLC.1,349$35.2K0.00%
MBM Wealth Consultants, LLC678$17.7K0.00%
Golden State Equity Partners357$9.31K0.00%
Twin Peaks Wealth Advisors, LLC339$8.84K0.00%
Bare Financial Services, Inc322$8.40K0.00%
Intentional Wealth Strategies, LLC210$5.48K0.01%
Cassaday & Co Wealth Management LLC164$4.28K0.00%
Bayban81$2.11K0.00%
Owl Creek Wealth Partners LLC65$1.70K0.00%
Synergy Investment Management, LLC52$1.36K0.00%
Phillip James Consulting Co.18$1.00K0.00%
Bogart Wealth, LLC19$4960.00%
Cornerstone Financial Management LLC16$4170.00%
Vermillion Wealth Management, Inc.11$2870.00%
Fortitude Family Office, LLC10$2610.00%
SHP Wealth Management5$1300.00%
HFM Investment Advisors, LLC4$1040.00%
DiNuzzo Private Wealth, Inc.1$270.00%
Lloyd Advisory Services, LLC.1$260.00%
Activest Wealth Management1$260.00%

Sold out (60)

Institutions that held Amentum Holdings, Inc. at the end of Q4 2025 and filed for Q1 2026 without it.

Institutions that sold out of AMTM in Q1 2026
InstitutionShares, Q4 2025Value, Q4 2025
ExodusPoint Capital Management, LP1,184,186$34.3M
Two Sigma Advisers, LP157,077$4.56M
Twinbeech Capital LP137,453$3.99M
Blackstone Group Inc.99,643$2.89M
Resolute Capital Asset Partners LLC70,000$2.03M
Mariner, LLC48,837$1.42M
Versor Investments LP42,809$1.24M
Ieq Capital, LLC38,025$1.10M
Capital Fund Management S.A.36,812$1.07M
Marshall Wace, LLP35,084$1.02M
American Trust Investment Advisors, LLC29,175$846.1K
Group One Trading, L.P.28,498$826.4K
Alpine Global Management, LLC25,000$725.0K
Quest Partners LLC24,111$699.2K
Magnetar Financial LLC20,875$605.4K
Qsemble Capital Management, LP20,136$583.9K
Carlson Capital L P19,000$551.0K
Wellington Management Group LLP18,948$549.5K
Oxford Asset Management LLP18,629$540.2K
Impact Partnership Wealth, LLC16,314$473.1K
Profund Advisors LLC15,771$457.4K
Summit Financial, LLC15,175$440.1K
LuminArx Capital Management LP15,000$435.0K
Penserra Capital Management LLC11,268$326.0K
Y-Intercept (Hong Kong) Ltd10,497$304.4K
Grantham, Mayo, Van Otterloo & Co. LLC10,457$303.3K
ARS Investment Partners, LLC10,000$290.0K
Symmetry Investments LP10,000$290.0K
Guggenheim Capital LLC9,439$273.7K
Comprehensive Financial Planning, Inc.8,830$256.1K
Concurrent Investment Advisors, LLC8,382$243.1K
Keybank National Association7,689$223.0K
Sage Rhino Capital LLC7,336$212.7K
United Capital Financial Advisers, LLC6,952$201.6K
Kestra Advisory Services, LLC3,690$107.0K
Vermillion & White Wealth Management Group, LLC1,905$55.2K
Flagship Harbor Advisors, LLC626$18.2K
Mendota Financial Group, LLC515$14.9K
Thurston, Springer, Miller, Herd & Titak, Inc.511$14.8K
Winch Advisory Services, LLC365$10.6K
Laurel Wealth Advisors LLC275$7.97K
DV Trading LLC188$5.45K
Harbor Capital Advisors, Inc.169$5.00K
Garton & Associates Financial Advisors LLC107$3.10K
Asset Dedication, LLC92$2.67K
Macquarie Group Ltd79$2.29K
Evermay Wealth Management LLC57$1.65K
North Star Investment Management Corp.39$1.13K
FNY Investment Advisers, LLC45$1.00K
Team Financial Group, LLC21$609
Leonteq Securities AG19$551
SWAN Capital LLC16$464
Wiser Advisor Group LLC13$377
Wealth Watch Advisors, INC13$377
Elyxium Wealth, LLC11$319
Fairway Wealth LLC10$290
Private Wealth Asset Management, LLC2$58
SageView Advisory Group, LLC1$29
Cetera Trust Company, N.A1$29
Winnow Wealth LLC1$29

Not filed for Q1 2026 yet (7)

Institutions that held Amentum Holdings, Inc. at the end of Q4 2025 and haven't filed a 13F for Q1 2026. Not filing isn't selling, so they aren't counted as sold out.

Institutions holding AMTM in Q4 2025 that haven't filed for Q1 2026
InstitutionShares, Q4 2025Value, Q4 2025
Vanguard Group Inc15,411,745$446.9M
Norges Bank2,294,097$66.5M
Comerica Bank301,564$8.75M
Janney Capital Management LLC8,306$241.0K
CIBC Private Wealth Group, LLC3,139$91.0K
Global Retirement Partners, LLC1,539$44.6K
ORG Partners LLC130$3.77K