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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 $4.35B in total; Soros Fund Management is the only superinvestor holding it.

13F holders, Q2 2026

Institutional positions in Amentum Holdings, Inc. as of Jun 30, 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
464
−15 vs. Q1 2026
Shares held
219.1M
+8.19M (+3.9%) vs. Q1 2026
Total value
$4.35B
−$925.1M (−17.5%) vs. Q1 2026
New holders
59
150 more added
Sold out
74
160 more reduced

7 institutions that held it in Q1 2026 haven't filed for Q2 2026 yet. Not filing isn't selling, so they aren't counted as sold out or in the changes above.

Compare with Q1 2026: 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 holdersQ2 2026: 464 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 heldQ2 2026: $4.35B
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: $3.25BQ4 2024: $3.50BQ1 2025: $3.50BQ2 2025: $4.74BQ3 2025: $4.63BQ4 2025: $5.64BQ1 2026: $5.28BQ2 2026: $4.35B
Institutions holding AMTM and their total value by quarter
QuarterHoldersValue
Q2 2026464$4.35B
Q1 2026486$5.28B
Q4 2025483$5.64B
Q3 2025462$4.63B
Q2 2025461$4.74B
Q1 2025418$3.50B
Q4 2024451$3.50B
Q3 2024492$3.25B
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, Q2 2026

Shares, value and share of portfolio for each institution holding Amentum Holdings, Inc.; share changes are against Q1 2026.

Institutions holding AMTM in Q2 2026
InstitutionSharesValue% of portfolioChange in sharesAction
Institute for Wealth Management, LLC.0$50.00%0New
Transamerica Financial Advisors, Inc.1$200.00%−6−85.7%Reduced
SJS Investment Consulting Inc.1$210.00%−5−83.3%Reduced
First Horizon Corp1$210.00%−5−83.3%Reduced
Cullen/Frost Bankers, Inc.1$210.00%−1−50.0%Reduced
Costello Asset Management, INC1$210.00%00.0%Unchanged
Activest Wealth Management1$210.00%00.0%Unchanged
IMA Wealth, Inc.2$410.00%−5−71.4%Reduced
Park Place Capital Corp2$410.00%00.0%Unchanged
Union Savings Bank2$410.00%00.0%Unchanged
Raffa Wealth Management, LLC2$410.00%+2New
Dunhill Financial, LLC2$530.00%−5−71.4%Reduced
SOA Wealth Advisors, LLC.3$620.00%00.0%Unchanged
Bay Harbor Wealth Management, LLC3$620.00%+3New
DiNuzzo Private Wealth, Inc.3$630.00%+2+200.0%Added
DecisionPoint Financial, LLC4$810.00%+4New
Morton Brown Family Wealth, LLC4$830.00%00.0%Unchanged
Wilkerson Advisory Group LLC4$830.00%00.0%Unchanged
Maryland Capital Advisors Inc.4$830.00%+4New
Louisbourg Investments Inc.5$1030.00%00.0%Unchanged
Abound Wealth Management5$1040.00%−3−37.5%Reduced
Whipplewood Advisors, LLC6$1240.00%−8−57.1%Reduced
Archer Investment Corp6$1260.00%+3+100.0%Added
Cornerstone Planning Group LLC6$1290.00%00.0%Unchanged
UMA Financial Services, Inc.7$1450.00%00.0%Unchanged
Minot DeBlois Advisors LLC8$1650.00%00.0%Unchanged
Davis Capital Management8$1650.00%+8New
Three Bearings Fiduciary Advisors, Inc.8$1660.00%00.0%Unchanged
Torren Management, LLC9$1860.00%00.0%Unchanged
HFM Investment Advisors, LLC9$1870.00%+5+125.0%Added
Arlington Trust Co LLC11$2270.00%−100−90.1%Reduced
Manchester Capital Management LLC14$2900.00%00.0%Unchanged
Compagnie Lombard Odier SCmA15$3100.00%+15New
Silver Grove Financial Group, Inc.17$3510.00%+17New
Gilpin Wealth Management, LLC17$3520.00%+3+21.4%Added
Phillip James Consulting Co.18$3720.00%00.0%Unchanged
TD Capital Management LLC18$3720.00%00.0%Unchanged
Ankerstar Wealth, LLC19$3930.00%−11−36.7%Reduced
Eastern Bank20$4130.00%−1−4.8%Reduced
Financial Gravity Companies, Inc.24$4960.00%+24New
First Pacific Financial26$5380.00%+26New
South State Corp.27$5590.00%+9+50.0%Added
MidFirst Bank30$6200.00%00.0%Unchanged
LifeSteps Financial, Inc.30$6200.00%+30New
Creative Financial Designs Inc33$6820.00%00.0%Unchanged
Bokf, NA33$6820.00%+33New
Bell Investment Advisors, Inc34$7030.00%−26−43.3%Reduced
JFS Wealth Advisors, LLC34$7030.00%−5−12.8%Reduced
MV Capital Management, Inc.34$7030.00%00.0%Unchanged
Plante Moran Financial Advisors, LLC34$7030.00%+34New
Nvest Wealth Strategies, Inc.37$7650.00%00.0%Unchanged
Creative Capital Management Investments LLC38$7850.00%+38New
Bruce G. Allen Investments, LLC39$8060.00%−21−35.0%Reduced
Kozak & Associates, Inc.44$8890.00%00.0%Unchanged
Action Point Financial Planning, LLC47$9090.00%+47New
Capital Analysts, LLC26$1.00K0.00%−26−50.0%Reduced
Centerpoint Advisors, LLC69$1.00K0.00%00.0%Unchanged
Rialto Wealth Management, LLC50$1.03K0.00%+23+85.2%Added
Rakuten Securities, Inc.55$1.14K0.00%−81−59.6%Reduced
Prestige Wealth Management Group LLC57$1.18K0.00%+23+67.6%Added
Zions Bancorporation, National Association62$1.28K0.00%+58+1,450.0%Added
Anchor Investment Management, LLC63$1.30K0.00%00.0%Unchanged
High Note Wealth, LLC63$1.30K0.00%00.0%Unchanged
Fortitude Family Office, LLC63$1.30K0.00%+53+530.0%Added
Proathlete Wealth Management LLC64$1.32K0.00%00.0%Unchanged
Owl Creek Wealth Partners LLC65$1.34K0.00%00.0%Unchanged
Hughes Financial Services, LLC69$1.43K0.00%−1−1.4%Reduced
Huntington National Bank74$1.53K0.00%−65−46.8%Reduced
Farmers & Merchants Investments Inc75$1.55K0.00%00.0%Unchanged
NBH Bank78$1.61K0.00%+78New
Evolution Wealth Management Inc.88$1.82K0.00%+88New
Central Trust Co96$1.99K0.00%−40−29.4%Reduced
Rosenberg Matthew Hamilton99$2.05K0.00%00.0%Unchanged
Crews Bank & Trust100$2.07K0.00%00.0%Unchanged
Harbor Investment Advisory, LLC106$2.19K0.00%00.0%Unchanged
Ramirez Asset Management, Inc.106$2.19K0.00%00.0%Unchanged
Godsey & Gibb Associates106$2.19K0.00%00.0%Unchanged
Grove Bank & Trust108$2.23K0.00%00.0%Unchanged
Massmutual Trust Co FSB109$2.25K0.00%−7−6.0%Reduced
BankPlus Trust Department110$2.27K0.00%00.0%Unchanged
Brown, Lisle/Cummings, Inc.118$2.44K0.00%−4−3.3%Reduced
Roxbury Financial LLC118$2.44K0.00%00.0%Unchanged
Mather Group, LLC.121$2.50K0.00%−1,228−91.0%Reduced
CVA Family Office, LLC131$2.71K0.00%+62+89.9%Added
Quarry LP139$2.87K0.00%−2,411−94.5%Reduced
Brooklyn FI, LLC135$2.89K0.00%+135New
Bogart Wealth, LLC154$3.18K0.00%+135+710.5%Added
Y.D. More Investments Ltd158$3.26K0.00%−178−53.0%Reduced
Atlantic Edge Private Wealth Management, LLC164$3.39K0.00%00.0%Unchanged
Mitsubishi UFJ Kokusai Asset Management Co., Ltd.170$3.51K0.00%00.0%Unchanged
Geneos Wealth Management Inc.170$3.51K0.00%00.0%Unchanged
Versant Capital Management, Inc171$3.54K0.00%−113−39.8%Reduced
Elevated Capital Advisors, LLC177$3.66K0.00%00.0%Unchanged
Private Wealth Management Group, LLC177$3.66K0.00%+77+77.0%Added
Assetmark, Inc180$3.72K0.00%+32+21.6%Added
Cromwell Holdings LLC184$3.80K0.00%00.0%Unchanged
Glen Eagle Advisors, LLC184$3.80K0.00%00.0%Unchanged
Sachetta, LLC194$4.01K0.00%00.0%Unchanged
Bellevue Asset Management, LLC197$4.07K0.00%00.0%Unchanged
True Wealth Design, LLC197$4.07K0.00%+37+23.1%Added