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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, 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
218.9M
+7.93M (+3.8%) vs. Q1 2026
Total value
$4.34B
−$931.8M (−17.7%) vs. Q1 2026
New holders
59
147 more added
Sold out
74
161 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: $4.34B
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, 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
High Note Wealth, LLC63$1.30K0.00%00.0%Unchanged
Fortitude Family Office, LLC63$1.30K0.00%+53+530.0%Added
Zions Bancorporation, National Association62$1.28K0.00%+58+1,450.0%Added
Prestige Wealth Management Group LLC57$1.18K0.00%+23+67.6%Added
Rakuten Securities, Inc.55$1.14K0.00%−81−59.6%Reduced
Rialto Wealth Management, LLC50$1.03K0.00%+23+85.2%Added
Capital Analysts, LLC26$1.00K0.00%−26−50.0%Reduced
Centerpoint Advisors, LLC69$1.00K0.00%00.0%Unchanged
Action Point Financial Planning, LLC47$9090.00%+47New
Kozak & Associates, Inc.44$8890.00%00.0%Unchanged
Bruce G. Allen Investments, LLC39$8060.00%−21−35.0%Reduced
Creative Capital Management Investments LLC38$7850.00%+38New
Nvest Wealth Strategies, Inc.37$7650.00%00.0%Unchanged
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
Creative Financial Designs Inc33$6820.00%00.0%Unchanged
Bokf, NA33$6820.00%+33New
MidFirst Bank30$6200.00%00.0%Unchanged
LifeSteps Financial, Inc.30$6200.00%+30New
South State Corp.27$5590.00%+9+50.0%Added
First Pacific Financial26$5380.00%+26New
Financial Gravity Companies, Inc.24$4960.00%+24New
Eastern Bank20$4130.00%−1−4.8%Reduced
Ankerstar Wealth, LLC19$3930.00%−11−36.7%Reduced
Phillip James Consulting Co.18$3720.00%00.0%Unchanged
TD Capital Management LLC18$3720.00%00.0%Unchanged
Gilpin Wealth Management, LLC17$3520.00%+3+21.4%Added
Silver Grove Financial Group, Inc.17$3510.00%+17New
Compagnie Lombard Odier SCmA15$3100.00%+15New
Manchester Capital Management LLC14$2900.00%00.0%Unchanged
Arlington Trust Co LLC11$2270.00%−100−90.1%Reduced
HFM Investment Advisors, LLC9$1870.00%+5+125.0%Added
Torren Management, LLC9$1860.00%00.0%Unchanged
Three Bearings Fiduciary Advisors, Inc.8$1660.00%00.0%Unchanged
Minot DeBlois Advisors LLC8$1650.00%00.0%Unchanged
Davis Capital Management8$1650.00%+8New
UMA Financial Services, Inc.7$1450.00%00.0%Unchanged
Cornerstone Planning Group LLC6$1290.00%00.0%Unchanged
Whipplewood Advisors, LLC6$1240.00%−8−57.1%Reduced
Abound Wealth Management5$1040.00%−3−37.5%Reduced
Louisbourg Investments Inc.5$1030.00%00.0%Unchanged
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
DecisionPoint Financial, LLC4$810.00%+4New
Archer Investment Corp3$630.00%00.0%Unchanged
DiNuzzo Private Wealth, Inc.3$630.00%+2+200.0%Added
SOA Wealth Advisors, LLC.3$620.00%00.0%Unchanged
Bay Harbor Wealth Management, LLC3$620.00%+3New
Dunhill Financial, LLC2$530.00%−5−71.4%Reduced
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
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
Transamerica Financial Advisors, Inc.1$200.00%−6−85.7%Reduced
Institute for Wealth Management, LLC.0$50.00%0New
BDF-Gestion676––−76−10.1%Reduced
Toronto Dominion Bank0$00.00%−1,565,223−100.0%Sold out
Brightline Capital Management, LLC0$00.00%−1,396,000−100.0%Sold out
Cooper Creek Partners Management LLC0$00.00%−929,334−100.0%Sold out
Penn Capital Management Co Inc0$00.00%−694,352−100.0%Sold out
Ci Investments Inc.0$00.00%−420,068−100.0%Sold out
Hyperion Capital Advisors LP0$00.00%−303,576−100.0%Sold out
Oak Thistle LLC0$00.00%−71,759−100.0%Sold out
K2 Principal Fund, L.P.0$00.00%−60,000−100.0%Sold out
Marex Group plc0$00.00%−53,043−100.0%Sold out
Mirabella Financial Services LLP0$00.00%−52,498−100.0%Sold out
Maverick Capital LtdSuperinvestorMaverick Capital0$00.00%−46,335−100.0%Sold out
Landscape Capital Management, L.L.C.0$00.00%−40,393−100.0%Sold out
Walleye Trading LLC0$00.00%−28,548−100.0%Sold out
Stifel Financial Corp0$00.00%−21,935−100.0%Sold out
Massar Capital Management, LP0$00.00%−21,056−100.0%Sold out
Aristeia Capital LLC0$00.00%−20,605−100.0%Sold out
Allstate Corp0$00.00%−19,471−100.0%Sold out
Modera Wealth Management, LLC0$00.00%−18,402−100.0%Sold out
EntryPoint Capital, LLC0$00.00%−17,978−100.0%Sold out
Aigen Investment Management, LP0$00.00%−16,916−100.0%Sold out
Mackenzie Financial Corp0$00.00%−16,270−100.0%Sold out
BCS Private Wealth Management, Inc.0$00.00%−14,624−100.0%Sold out
Davenport & Co LLC0$00.00%−13,558−100.0%Sold out
Lighthouse Investment Partners, LLC0$00.00%−12,099−100.0%Sold out
Canada Pension Plan Investment Board0$00.00%−11,594−100.0%Sold out
Caldwell Investment Management Ltd.0$00.00%−11,669−100.0%Sold out
Brown Advisory Inc0$00.00%−9,928−100.0%Sold out
M&T Bank Corp0$00.00%−9,610−100.0%Sold out
IHT Wealth Management, LLC0$00.00%−9,537−100.0%Sold out
DRW Securities, LLC0$00.00%−9,412−100.0%Sold out
Evergreen Capital Management LLC0$00.00%−9,103−100.0%Sold out
Vann Equity Management LLC0$00.00%−9,018−100.0%Sold out
Syon Capital LLC0$00.00%−8,814−100.0%Sold out
Silvercrest Asset Management Group LLC0$00.00%−8,515−100.0%Sold out
Alpine Woods Capital Investors, LLC0$00.00%−8,402−100.0%Sold out
Utah Retirement Systems0$00.00%−8,339−100.0%Sold out