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Livermore
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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.

13F holders, Q1 2026

Institutional positions in Amentum Holdings, Inc. as of Mar 31, 2026. Investment managers with $100 million or more in US stocks report their long positions on Form 13F within 45 days after each quarter ends. How 13F works

Institutional holders
486
+10 vs. Q4 2025
Shares held
211.1M
+25.3M (+13.6%) vs. Q4 2025
Total value
$5.28B
+$162.1M (+3.2%) vs. Q4 2025
New holders
70
151 more added
Sold out
60
152 more reduced

7 institutions that held it in Q4 2025 haven't filed for Q1 2026 yet. Not filing isn't selling, so they aren't counted as sold out or in the changes above.

Compare with Q4 2025: new holders, sold out and not filed yet

Holders and value by quarter

Institutions reporting AMTM on Form 13F each quarter since Q1 2021, and the total value they reported. Values are as of each quarter end, so they also move with the share price.

Institutional holdersQ1 2026: 486 institutions
Q1 2021: 0 institutionsQ2 2021: 0 institutionsQ3 2021: 0 institutionsQ4 2021: 0 institutionsQ1 2022: 0 institutionsQ2 2022: 0 institutionsQ3 2022: 0 institutionsQ4 2022: 0 institutionsQ1 2023: 0 institutionsQ2 2023: 0 institutionsQ3 2023: 0 institutionsQ4 2023: 0 institutionsQ1 2024: 0 institutionsQ2 2024: 0 institutionsQ3 2024: 492 institutionsQ4 2024: 451 institutionsQ1 2025: 418 institutionsQ2 2025: 461 institutionsQ3 2025: 462 institutionsQ4 2025: 483 institutionsQ1 2026: 486 institutionsQ2 2026: 464 institutions
Value heldQ1 2026: $5.28B
Q1 2021: $0Q2 2021: $0Q3 2021: $0Q4 2021: $0Q1 2022: $0Q2 2022: $0Q3 2022: $0Q4 2022: $0Q1 2023: $0Q2 2023: $0Q3 2023: $0Q4 2023: $0Q1 2024: $0Q2 2024: $0Q3 2024: $3.23BQ4 2024: $3.48BQ1 2025: $3.49BQ2 2025: $4.73BQ3 2025: $4.63BQ4 2025: $5.64BQ1 2026: $5.28BQ2 2026: $4.34B
Institutions holding AMTM and their total value by quarter
QuarterHoldersValue
Q2 2026464$4.34B
Q1 2026486$5.28B
Q4 2025483$5.64B
Q3 2025462$4.63B
Q2 2025461$4.73B
Q1 2025418$3.49B
Q4 2024451$3.48B
Q3 2024492$3.23B
Q2 20240$0
Q1 20240$0
Q4 20230$0
Q3 20230$0
Q2 20230$0
Q1 20230$0
Q4 20220$0
Q3 20220$0
Q2 20220$0
Q1 20220$0
Q4 20210$0
Q3 20210$0
Q2 20210$0
Q1 20210$0

Institutions, Q1 2026

Shares, value and share of portfolio for each institution holding Amentum Holdings, Inc.; share changes are against Q4 2025.

Institutions holding AMTM in Q1 2026
InstitutionSharesValue% of portfolioChange in sharesAction
Roxbury Financial LLC118$3.08K0.00%00.0%Unchanged
Massmutual Trust Co FSB116$3.02K0.00%−79−40.5%Reduced
Arlington Trust Co LLC111$2.90K0.00%+11+11.0%Added
BankPlus Trust Department110$2.87K0.00%00.0%Unchanged
Grove Bank & Trust108$2.82K0.00%00.0%Unchanged
Godsey & Gibb Associates106$2.77K0.00%00.0%Unchanged
Harbor Investment Advisory, LLC106$2.76K0.00%00.0%Unchanged
Ramirez Asset Management, Inc.106$2.76K0.00%00.0%Unchanged
Private Wealth Management Group, LLC100$2.61K0.00%00.0%Unchanged
Crews Bank & Trust100$2.61K0.00%00.0%Unchanged
Rosenberg Matthew Hamilton99$2.58K0.00%00.0%Unchanged
Bayban81$2.11K0.00%+81New
Bank of Jackson Hole Trust78$2.03K0.00%00.0%Unchanged
Capital Analysts, LLC52$2.00K0.00%−26−33.3%Reduced
Centerpoint Advisors, LLC69$2.00K0.00%00.0%Unchanged
Farmers & Merchants Investments Inc75$1.96K0.00%−60−44.4%Reduced
SBI Securities Co., Ltd.71$1.85K0.00%+2+2.9%Added
Hughes Financial Services, LLC70$1.83K0.00%+1+1.4%Added
CVA Family Office, LLC69$1.80K0.00%+40+137.9%Added
Owl Creek Wealth Partners LLC65$1.70K0.00%+65New
Meramec Financial Planners, LLC61$1.69K0.00%00.0%Unchanged
Proathlete Wealth Management LLC64$1.67K0.00%00.0%Unchanged
Anchor Investment Management, LLC63$1.64K0.00%−24−27.6%Reduced
High Note Wealth, LLC63$1.64K0.00%00.0%Unchanged
Bell Investment Advisors, Inc60$1.56K0.00%00.0%Unchanged
Bruce G. Allen Investments, LLC60$1.56K0.00%+20+50.0%Added
Aventus Investment Advisors, Inc.59$1.54K0.00%−15−20.3%Reduced
Towarzystwo Funduszy Inwestycyjnych Pzu SA53$1.38K0.00%00.0%Unchanged
Synergy Investment Management, LLC52$1.36K0.00%+52New
Kozak & Associates, Inc.44$1.21K0.00%00.0%Unchanged
JFS Wealth Advisors, LLC39$1.02K0.00%+12+44.4%Added
Phillip James Consulting Co.18$1.00K0.00%+18New
Nvest Wealth Strategies, Inc.37$9650.00%00.0%Unchanged
MV Capital Management, Inc.34$8870.00%−1−2.9%Reduced
Prestige Wealth Management Group LLC34$8870.00%+20+142.9%Added
Creative Financial Designs Inc33$8610.00%00.0%Unchanged
MidFirst Bank30$7820.00%−3−9.1%Reduced
Ankerstar Wealth, LLC30$7820.00%+5+20.0%Added
Clayton Financial Group LLC27$7050.00%00.0%Unchanged
Rialto Wealth Management, LLC27$7050.00%00.0%Unchanged
Sofos Investments, Inc.24$6260.00%00.0%Unchanged
Red Tortoise LLC23$6000.00%00.0%Unchanged
Eastern Bank21$5480.00%00.0%Unchanged
Bogart Wealth, LLC19$4960.00%+19New
South State Corp.18$4700.00%00.0%Unchanged
TD Capital Management LLC18$4690.00%00.0%Unchanged
Cornerstone Financial Management LLC16$4170.00%+16New
Hilltop National Bank15$3910.00%00.0%Unchanged
Manchester Capital Management LLC14$3660.00%00.0%Unchanged
Gilpin Wealth Management, LLC14$3660.00%+2+16.7%Added
Whipplewood Advisors, LLC14$3650.00%+7+100.0%Added
NBT Bank N A12$3130.00%00.0%Unchanged
Vermillion Wealth Management, Inc.11$2870.00%+11New
Annis Gardner Whiting Capital Advisors, LLC10$2610.00%00.0%Unchanged
Fortitude Family Office, LLC10$2610.00%+10New
Torren Management, LLC9$2350.00%−234−96.3%Reduced
Minot DeBlois Advisors LLC8$2090.00%−46−85.2%Reduced
Three Bearings Fiduciary Advisors, Inc.8$2090.00%00.0%Unchanged
Kayne Anderson Rudnick Investment Management LLC8$2090.00%00.0%Unchanged
Abound Wealth Management8$2090.00%00.0%Unchanged
Dunhill Financial, LLC7$1880.00%00.0%Unchanged
UMA Financial Services, Inc.7$1830.00%00.0%Unchanged
IMA Wealth, Inc.7$1820.00%00.0%Unchanged
Transamerica Financial Advisors, Inc.7$1820.00%+4+133.3%Added
SJS Investment Consulting Inc.6$1570.00%−9−60.0%Reduced
First Horizon Corp6$1560.00%+5+500.0%Added
Cornerstone Planning Group LLC6$1460.00%00.0%Unchanged
Louisbourg Investments Inc.5$1300.00%00.0%Unchanged
SHP Wealth Management5$1300.00%+5New
Zions Bancorporation, National Association4$1040.00%00.0%Unchanged
Morton Brown Family Wealth, LLC4$1040.00%00.0%Unchanged
Wilkerson Advisory Group LLC4$1040.00%00.0%Unchanged
HFM Investment Advisors, LLC4$1040.00%+4New
Archer Investment Corp3$800.00%00.0%Unchanged
SOA Wealth Advisors, LLC.3$780.00%00.0%Unchanged
Cullen/Frost Bankers, Inc.2$520.00%00.0%Unchanged
Park Place Capital Corp2$520.00%00.0%Unchanged
Union Savings Bank2$520.00%00.0%Unchanged
Signature Equity Partners, LLC2$520.00%00.0%Unchanged
DiNuzzo Private Wealth, Inc.1$270.00%+1New
Kingdom Financial Group LLC.1$260.00%−1−50.0%Reduced
Sunbelt Securities, Inc.1$260.00%00.0%Unchanged
Costello Asset Management, INC1$260.00%00.0%Unchanged
Scarborough Advisors, LLC1$260.00%00.0%Unchanged
Lloyd Advisory Services, LLC.1$260.00%+1New
Activest Wealth Management1$260.00%+1New
ExodusPoint Capital Management, LP0$00.00%−1,184,186−100.0%Sold out
Two Sigma Advisers, LP0$00.00%−157,077−100.0%Sold out
Twinbeech Capital LP0$00.00%−137,453−100.0%Sold out
Blackstone Group Inc.0$00.00%−99,643−100.0%Sold out
Resolute Capital Asset Partners LLC0$00.00%−70,000−100.0%Sold out
Mariner, LLC0$00.00%−48,837−100.0%Sold out
Versor Investments LP0$00.00%−42,809−100.0%Sold out
Ieq Capital, LLC0$00.00%−38,025−100.0%Sold out
Capital Fund Management S.A.0$00.00%−36,812−100.0%Sold out
Marshall Wace, LLP0$00.00%−35,084−100.0%Sold out
American Trust Investment Advisors, LLC0$00.00%−29,175−100.0%Sold out
Group One Trading, L.P.0$00.00%−28,498−100.0%Sold out
Alpine Global Management, LLC0$00.00%−25,000−100.0%Sold out
Quest Partners LLC0$00.00%−24,111−100.0%Sold out