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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, Q4 2025

Institutional positions in Amentum Holdings, Inc. as of Dec 31, 2025. 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
483
+31 vs. Q3 2025
Shares held
203.8M
+10.7M (+5.5%) vs. Q3 2025
Total value
$5.64B
+$1.01B (+21.9%) vs. Q3 2025
New holders
88
132 more added
Sold out
57
159 more reduced

10 institutions that held it in Q3 2025 haven't filed for Q4 2025 yet. Not filing isn't selling, so they aren't counted as sold out or in the changes above.

Compare with Q3 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 holdersQ4 2025: 483 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 heldQ4 2025: $5.64B
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, Q4 2025

Shares, value and share of portfolio for each institution holding Amentum Holdings, Inc.; share changes are against Q3 2025.

Institutions holding AMTM in Q4 2025
InstitutionSharesValue% of portfolioChange in sharesAction
Scarborough Advisors, LLC1$290.00%−1−50.0%Reduced
First Horizon Corp1$290.00%00.0%Unchanged
Sunbelt Securities, Inc.1$290.00%00.0%Unchanged
Costello Asset Management, INC1$290.00%00.0%Unchanged
Cetera Trust Company, N.A1$290.00%00.0%Unchanged
Winnow Wealth LLC1$290.00%00.0%Unchanged
SageView Advisory Group, LLC1$290.00%+1New
Cullen/Frost Bankers, Inc.2$580.00%−135−98.5%Reduced
Harbour Investments, Inc.2$580.00%−29−93.5%Reduced
Private Wealth Asset Management, LLC2$580.00%00.0%Unchanged
Park Place Capital Corp2$580.00%00.0%Unchanged
Kingdom Financial Group LLC.2$580.00%+2New
Union Savings Bank2$580.00%+2New
Signature Equity Partners, LLC2$580.00%+2New
SOA Wealth Advisors, LLC.3$870.00%00.0%Unchanged
Transamerica Financial Advisors, Inc.3$870.00%+1+50.0%Added
Archer Investment Corp3$890.00%00.0%Unchanged
Zions Bancorporation, National Association4$1160.00%00.0%Unchanged
Morton Brown Family Wealth, LLC4$1160.00%00.0%Unchanged
Wilkerson Advisory Group LLC4$1160.00%+4New
Louisbourg Investments Inc.5$1450.00%−15−75.0%Reduced
IMA Wealth, Inc.7$2030.00%00.0%Unchanged
UMA Financial Services, Inc.7$2030.00%00.0%Unchanged
Whipplewood Advisors, LLC7$2030.00%+7New
Dunhill Financial, LLC7$2070.00%+4+133.3%Added
Cornerstone Planning Group LLC6$2140.00%00.0%Unchanged
Kayne Anderson Rudnick Investment Management LLC8$2320.00%00.0%Unchanged
Abound Wealth Management8$2320.00%00.0%Unchanged
Picton Mahoney Asset Management8$2320.00%00.0%Unchanged
Three Bearings Fiduciary Advisors, Inc.8$2870.00%+8New
Annis Gardner Whiting Capital Advisors, LLC10$2900.00%00.0%Unchanged
Fairway Wealth LLC10$2900.00%+10New
Elyxium Wealth, LLC11$3190.00%+11New
NBT Bank N A12$3480.00%00.0%Unchanged
Gilpin Wealth Management, LLC12$3480.00%+12New
Wiser Advisor Group LLC13$3770.00%−79−85.9%Reduced
Wealth Watch Advisors, INC13$3770.00%00.0%Unchanged
Prestige Wealth Management Group LLC14$4060.00%00.0%Unchanged
Manchester Capital Management LLC14$4060.00%+4+40.0%Added
Hilltop National Bank15$4350.00%−83−84.7%Reduced
SJS Investment Consulting Inc.15$4350.00%+15New
SWAN Capital LLC16$4640.00%+15+1,500.0%Added
South State Corp.18$5220.00%00.0%Unchanged
TD Capital Management LLC18$5220.00%00.0%Unchanged
Leonteq Securities AG19$5510.00%00.0%Unchanged
Eastern Bank21$6090.00%−38−64.4%Reduced
Team Financial Group, LLC21$6090.00%00.0%Unchanged
Red Tortoise LLC23$6670.00%00.0%Unchanged
Sofos Investments, Inc.24$6960.00%00.0%Unchanged
Ankerstar Wealth, LLC25$7250.00%+25New
JFS Wealth Advisors, LLC27$7830.00%00.0%Unchanged
Clayton Financial Group LLC27$7830.00%00.0%Unchanged
Rialto Wealth Management, LLC27$7830.00%00.0%Unchanged
CVA Family Office, LLC29$8410.00%00.0%Unchanged
Creative Financial Designs Inc33$9570.00%00.0%Unchanged
MidFirst Bank33$9570.00%+33New
FNY Investment Advisers, LLC45$1.00K0.00%−2,355−98.1%Reduced
MV Capital Management, Inc.35$1.01K0.00%−1−2.8%Reduced
Nvest Wealth Strategies, Inc.37$1.07K0.00%+37New
North Star Investment Management Corp.39$1.13K0.00%00.0%Unchanged
Bruce G. Allen Investments, LLC40$1.16K0.00%00.0%Unchanged
Rakuten Securities, Inc.41$1.19K0.00%−33−44.6%Reduced
Kozak & Associates, Inc.44$1.48K0.00%00.0%Unchanged
Brown, Lisle/Cummings, Inc.53$1.54K0.00%00.0%Unchanged
Towarzystwo Funduszy Inwestycyjnych Pzu SA53$1.54K0.00%00.0%Unchanged
Minot DeBlois Advisors LLC54$1.57K0.00%−25−31.6%Reduced
Evermay Wealth Management LLC57$1.65K0.00%−42−42.4%Reduced
Bell Investment Advisors, Inc60$1.74K0.00%00.0%Unchanged
High Note Wealth, LLC63$1.83K0.00%00.0%Unchanged
Proathlete Wealth Management LLC64$1.86K0.00%+64New
Capital Analysts, LLC78$2.00K0.00%00.0%Unchanged
Centerpoint Advisors, LLC69$2.00K0.00%00.0%Unchanged
Hughes Financial Services, LLC69$2.00K0.00%+1+1.5%Added
SBI Securities Co., Ltd.69$2.00K0.00%+24+53.3%Added
Aventus Investment Advisors, Inc.74$2.15K0.00%−7−8.6%Reduced
Bank of Jackson Hole Trust78$2.26K0.00%−44−36.1%Reduced
Meramec Financial Planners, LLC61$2.29K0.00%+61New
Macquarie Group Ltd79$2.29K0.00%−302−79.3%Reduced
Anchor Investment Management, LLC87$2.52K0.00%00.0%Unchanged
Asset Dedication, LLC92$2.67K0.00%00.0%Unchanged
Rosenberg Matthew Hamilton99$2.87K0.00%00.0%Unchanged
Private Wealth Management Group, LLC100$2.90K0.00%−6−5.7%Reduced
Crews Bank & Trust100$2.90K0.00%00.0%Unchanged
Arlington Trust Co LLC100$2.90K0.00%+100New
Ramirez Asset Management, Inc.106$3.07K0.00%−36−25.4%Reduced
Godsey & Gibb Associates106$3.07K0.00%00.0%Unchanged
Harbor Investment Advisory, LLC106$3.07K0.00%00.0%Unchanged
Garton & Associates Financial Advisors LLC107$3.10K0.00%+107New
Grove Bank & Trust108$3.13K0.00%00.0%Unchanged
BankPlus Trust Department110$3.19K0.00%−334−75.2%Reduced
Walleye Capital LLC111$3.22K0.00%−89−44.5%Reduced
Roxbury Financial LLC118$3.42K0.00%00.0%Unchanged
Huntington National Bank125$3.63K0.00%−72−36.5%Reduced
ORG Partners LLC130$3.77K0.00%00.0%Unchanged
Farmers & Merchants Investments Inc135$3.92K0.00%−41−23.3%Reduced
McIlrath & Eck, LLC136$3.94K0.00%00.0%Unchanged
Assetmark, Inc142$4.12K0.00%+26+22.4%Added
TD Private Client Wealth LLC144$4.18K0.00%−1−0.7%Reduced
Golden State Wealth Management, LLC161$4.67K0.00%−111−40.8%Reduced
Atlantic Edge Private Wealth Management, LLC164$4.76K0.00%00.0%Unchanged