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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, Q3 2025

Institutional positions in Amentum Holdings, Inc. as of Sep 30, 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
462
+7 vs. Q2 2025
Shares held
193.4M
−4.76M (−2.4%) vs. Q2 2025
Total value
$4.63B
−$48.2M (−1.0%) vs. Q2 2025
New holders
76
104 more added
Sold out
69
179 more reduced

6 institutions that held it in Q2 2025 haven't filed for Q3 2025 yet. Not filing isn't selling, so they aren't counted as sold out or in the changes above.

Compare with Q2 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 holdersQ3 2025: 462 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 heldQ3 2025: $4.63B
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, Q3 2025

Shares, value and share of portfolio for each institution holding Amentum Holdings, Inc.; share changes are against Q2 2025.

Institutions holding AMTM in Q3 2025
InstitutionSharesValue% of portfolioChange in sharesAction
Picton Mahoney Asset Management8$00.00%00.0%Unchanged
Dynamic Wealth Strategies, LLC1$240.00%−54−98.2%Reduced
Costello Asset Management, INC1$240.00%−12−92.3%Reduced
Activest Wealth Management1$240.00%−2−66.7%Reduced
SWAN Capital LLC1$240.00%00.0%Unchanged
Cetera Trust Company, N.A1$240.00%00.0%Unchanged
First Horizon Corp1$240.00%+1New
Sunbelt Securities, Inc.1$240.00%+1New
Winnow Wealth LLC1$240.00%+1New
Park Place Capital Corp2$480.00%00.0%Unchanged
Scarborough Advisors, LLC2$480.00%00.0%Unchanged
Private Wealth Asset Management, LLC2$480.00%00.0%Unchanged
Transamerica Financial Advisors, Inc.2$480.00%+2New
Dunhill Financial, LLC3$630.00%+1+50.0%Added
Strengthening Families & Communities, LLC3$710.00%+3New
SOA Wealth Advisors, LLC.3$720.00%00.0%Unchanged
Archer Investment Corp3$740.00%00.0%Unchanged
Zions Bancorporation, National Association4$960.00%00.0%Unchanged
Morton Brown Family Wealth, LLC4$960.00%00.0%Unchanged
Cornerstone Planning Group LLC6$1310.00%00.0%Unchanged
UMA Financial Services, Inc.7$1680.00%00.0%Unchanged
IMA Wealth, Inc.7$1680.00%00.0%Unchanged
Kayne Anderson Rudnick Investment Management LLC8$1920.00%−4−33.3%Reduced
Abound Wealth Management8$1920.00%00.0%Unchanged
Manchester Capital Management LLC10$2400.00%−715−98.6%Reduced
Annis Gardner Whiting Capital Advisors, LLC10$2400.00%00.0%Unchanged
Binnacle Investments Inc10$2400.00%+10New
NBT Bank N A12$2870.00%−126−91.3%Reduced
Virtus ETF Advisers LLC12$2870.00%−109−90.1%Reduced
Wealth Watch Advisors, INC13$3110.00%+13New
Prestige Wealth Management Group LLC14$3360.00%00.0%Unchanged
Horizon Investments, LLC16$3830.00%−97−85.8%Reduced
Trust Co of Vermont18$4310.00%00.0%Unchanged
TD Capital Management LLC18$4310.00%00.0%Unchanged
South State Corp.18$4320.00%−6−25.0%Reduced
Leonteq Securities AG19$4550.00%−2,000−99.1%Reduced
Johnson Financial Group, Inc.19$4560.00%+19New
Louisbourg Investments Inc.20$4790.00%−135−87.1%Reduced
Trust Co20$4790.00%+20New
Team Financial Group, LLC21$5030.00%00.0%Unchanged
AdvisorNet Financial, Inc22$5270.00%00.0%Unchanged
Red Tortoise LLC23$5510.00%00.0%Unchanged
Logan Capital Management Inc24$5750.00%00.0%Unchanged
Sofos Investments, Inc.24$5750.00%+24New
Contravisory Investment Management, Inc.27$6470.00%−206−88.4%Reduced
Rialto Wealth Management, LLC27$6470.00%−23−46.0%Reduced
JFS Wealth Advisors, LLC27$6470.00%00.0%Unchanged
Clayton Financial Group LLC27$6470.00%+27New
CVA Family Office, LLC29$6950.00%00.0%Unchanged
Harbour Investments, Inc.31$7420.00%−248−88.9%Reduced
Principal Securities, Inc.33$7900.00%−2−5.7%Reduced
Creative Financial Designs Inc33$7900.00%00.0%Unchanged
Creekmur Asset Management LLC34$8140.00%+18+112.5%Added
Deseret Mutual Benefit Administrators36$8620.00%−238−86.9%Reduced
MV Capital Management, Inc.36$8630.00%+2+5.9%Added
North Star Investment Management Corp.39$9340.00%00.0%Unchanged
Kozak & Associates, Inc.44$9460.00%−61−58.1%Reduced
Atlantic Trust, LLC40$9580.00%00.0%Unchanged
Bruce G. Allen Investments, LLC40$9580.00%00.0%Unchanged
RMG Wealth Management LLC43$9700.00%00.0%Unchanged
SBI Securities Co., Ltd.45$1.08K0.00%−11−19.6%Reduced
Brown, Lisle/Cummings, Inc.53$1.27K0.00%00.0%Unchanged
Towarzystwo Funduszy Inwestycyjnych Pzu SA53$1.27K0.00%00.0%Unchanged
Eastern Bank59$1.41K0.00%−9−13.2%Reduced
Bell Investment Advisors, Inc60$1.44K0.00%−29−32.6%Reduced
High Note Wealth, LLC63$1.51K0.00%00.0%Unchanged
Hughes Financial Services, LLC68$1.55K0.00%00.0%Unchanged
True Wealth Design, LLC66$1.58K0.00%00.0%Unchanged
Rakuten Securities, Inc.74$1.77K0.00%−234−76.0%Reduced
First Financial Corp79$1.89K0.00%00.0%Unchanged
Minot DeBlois Advisors LLC79$1.89K0.00%00.0%Unchanged
Aventus Investment Advisors, Inc.81$1.94K0.00%−2−2.4%Reduced
Capital Analysts, LLC78$2.00K0.00%00.0%Unchanged
Centerpoint Advisors, LLC69$2.00K0.00%00.0%Unchanged
Anchor Investment Management, LLC87$2.08K0.00%00.0%Unchanged
Ameritas Advisory Services, LLC88$2.11K0.00%+88New
Asset Dedication, LLC92$2.20K0.00%00.0%Unchanged
Wiser Advisor Group LLC92$2.21K0.00%+92New
Hilltop National Bank98$2.35K0.00%00.0%Unchanged
Rosenberg Matthew Hamilton99$2.37K0.00%00.0%Unchanged
Evermay Wealth Management LLC99$2.37K0.00%00.0%Unchanged
Crews Bank & Trust100$2.40K0.00%−803−88.9%Reduced
Godsey & Gibb Associates106$2.54K0.00%00.0%Unchanged
Harbor Investment Advisory, LLC106$2.54K0.00%00.0%Unchanged
Private Wealth Management Group, LLC106$2.54K0.00%00.0%Unchanged
TruNorth Capital Management, LLC106$2.54K0.00%+106New
Grove Bank & Trust108$2.59K0.00%00.0%Unchanged
Assetmark, Inc116$2.78K0.00%+49+73.1%Added
Roxbury Financial LLC118$2.83K0.00%00.0%Unchanged
Bank of Jackson Hole Trust122$2.92K0.00%−189−60.8%Reduced
Hemington Wealth Management135$3.00K0.00%00.0%Unchanged
ORG Partners LLC130$3.11K0.00%00.0%Unchanged
GPS Wealth Strategies Group, LLC133$3.19K0.00%−10−7.0%Reduced
McIlrath & Eck, LLC136$3.26K0.00%00.0%Unchanged
Cullen/Frost Bankers, Inc.137$3.28K0.00%+102+291.4%Added
Rothschild Investment LLC140$3.35K0.00%−1−0.7%Reduced
Ramirez Asset Management, Inc.142$3.40K0.00%00.0%Unchanged
TD Private Client Wealth LLC145$3.47K0.00%−21−12.7%Reduced
Atlantic Edge Private Wealth Management, LLC164$3.93K0.00%00.0%Unchanged
Harbor Capital Advisors, Inc.170$4.00K0.00%00.0%Unchanged