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 2025
Institutional positions in Amentum Holdings, Inc. as of Jun 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
- 461
- +48 vs. Q1 2025
- Shares held
- 200.3M
- +8.87M (+4.6%) vs. Q1 2025
- Total value
- $4.73B
- +$1.25B (+35.7%) vs. Q1 2025
- New holders
- 113
- 233 more added
- Sold out
- 65
- 100 more reduced
5 institutions that held it in Q1 2025 haven't filed for Q2 2025 yet. Not filing isn't selling, so they aren't counted as sold out or in the changes above.
Compare with Q1 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.
| Quarter | Holders | Value |
|---|---|---|
| Q2 2026 | 464 | $4.34B |
| Q1 2026 | 486 | $5.28B |
| Q4 2025 | 483 | $5.64B |
| Q3 2025 | 462 | $4.63B |
| Q2 2025 | 461 | $4.73B |
| Q1 2025 | 418 | $3.49B |
| Q4 2024 | 451 | $3.48B |
| Q3 2024 | 492 | $3.23B |
| Q2 2024 | 0 | $0 |
| Q1 2024 | 0 | $0 |
| Q4 2023 | 0 | $0 |
| Q3 2023 | 0 | $0 |
| Q2 2023 | 0 | $0 |
| Q1 2023 | 0 | $0 |
| Q4 2022 | 0 | $0 |
| Q3 2022 | 0 | $0 |
| Q2 2022 | 0 | $0 |
| Q1 2022 | 0 | $0 |
| Q4 2021 | 0 | $0 |
| Q3 2021 | 0 | $0 |
| Q2 2021 | 0 | $0 |
| Q1 2021 | 0 | $0 |
Institutions, Q2 2025
Shares, value and share of portfolio for each institution holding Amentum Holdings, Inc.; share changes are against Q1 2025.
| Institution | Shares | Value | % of portfolio | Change in shares | Action |
|---|---|---|---|---|---|
| Swiss National Bank | 302,191 | $7.13M | 0.00% | +42,991+16.6% | Added |
| Russell Investments Group, Ltd. | 328,182 | $7.75M | 0.01% | +95,249+40.9% | Added |
| Royce & Associates LP | 335,000 | $7.91M | 0.08% | +335,000 | New |
| Ameriprise Financial Inc | 342,862 | $8.09M | 0.00% | +11,265+3.4% | Added |
| Citadel Advisors LLC | 342,899 | $8.10M | 0.01% | −2,583,583−88.3% | Reduced |
| Alliancebernstein L.P. | 348,684 | $8.23M | 0.00% | +293,505+531.9% | Added |
| AQR Capital Management LLC | 350,203 | $8.27M | 0.01% | +350,203 | New |
| Point72 Asset Management, L.P. | 350,628 | $8.28M | 0.02% | +350,628 | New |
| Comerica Bank | 361,862 | $8.54M | 0.03% | +113,144+45.5% | Added |
| Legal & General Group Plc | 404,673 | $9.55M | 0.00% | +13,736+3.5% | Added |
| Aristotle Capital Boston, LLC | 422,976 | $9.99M | 0.51% | −23,636−5.3% | Reduced |
| UBS Asset Management Americas Inc | 430,542 | $10.2M | 0.00% | +157,259+57.5% | Added |
| Vident Advisory, LLC | 432,165 | $10.2M | 0.11% | +139,308+47.6% | Added |
| Royal Bank of Canada | 443,200 | $10.5M | 0.00% | −138,995−23.9% | Reduced |
| Ci Investments Inc. | 454,422 | $10.7M | 0.04% | +10,841+2.4% | Added |
| Loews Corp | 470,000 | $11.1M | 0.09% | −102,684−17.9% | Reduced |
| Public Sector Pension Investment Board | 514,172 | $12.1M | 0.05% | +59,043+13.0% | Added |
| Nuveen, LLC | 516,574 | $12.2M | 0.00% | +228,773+79.5% | Added |
| Moore Capital Management, LP | 611,123 | $14.4M | 0.29% | +112,859+22.7% | Added |
| CSM Advisors, LLC | 633,048 | $14.9M | 0.44% | −5,009−0.8% | Reduced |
| Engine Capital Management, LP | 635,255 | $15.0M | 3.17% | 00.0% | Unchanged |
| Kopernik Global Investors, LLC | 636,226 | $15.0M | 1.65% | −441,269−41.0% | Reduced |
| Voya Investment Management LLC | 651,572 | $15.4M | 0.02% | +23,418+3.7% | Added |
| New York State Common Retirement Fund | 693,777 | $16.4M | 0.02% | +81,990+13.4% | Added |
| BW Gestao de Investimentos Ltda. | 715,065 | $16.9M | 1.60% | +320,665+81.3% | Added |
| Principal Financial Group Inc | 744,517 | $17.6M | 0.01% | +32,345+4.5% | Added |
| UBS Group AG | 766,304 | $18.1M | 0.00% | −763,830−49.9% | Reduced |
| Cacti Asset Management LLC | 848,946 | $19.9M | 1.46% | +14,504+1.7% | Added |
| Bank of New York Mellon Corp | 868,206 | $20.5M | 0.00% | +107,697+14.2% | Added |
| Bank of America Corp | 868,265 | $20.5M | 0.00% | −100,273−10.4% | Reduced |
| Avenir Corp | 895,352 | $21.1M | 2.17% | −8,810−1.0% | Reduced |
| Northern Trust Corp | 941,033 | $22.2M | 0.00% | +86,610+10.1% | Added |
| Brightline Capital Management, LLC | 1,000,000 | $23.6M | 10.17% | +1,000,000 | New |
| Penn Capital Management Co Inc | 1,003,472 | $23.8M | 2.05% | +114,038+12.8% | Added |
| Loomis Sayles & Co L P | 1,059,209 | $25.0M | 0.03% | +623,535+143.1% | Added |
| Dimensional Fund Advisors LP | 1,334,752 | $31.5M | 0.01% | +221,098+19.9% | Added |
| Mirae Asset Global ETFs Holdings Ltd. | 1,379,752 | $32.6M | 0.06% | +1,379,752 | New |
| Voss Capital, LLC | 1,400,000 | $33.1M | 2.28% | −820,709−37.0% | Reduced |
| 683 Capital Management, LLC | 1,630,000 | $38.5M | 3.90% | +617,000+60.9% | Added |
| Thrivent Financial for Lutherans | 1,687,105 | $39.8M | 0.09% | +65,781+4.1% | Added |
| Charles Schwab Investment Management Inc | 1,745,013 | $41.2M | 0.01% | +195,855+12.6% | Added |
| Freestone Grove Partners LP | 2,051,859 | $48.4M | 0.37% | +887,024+76.2% | Added |
| FIL Ltd | 2,067,205 | $48.8M | 0.04% | −142,108−6.4% | Reduced |
| Arvin Capital Management LP | 2,139,434 | $50.5M | 14.42% | +452,285+26.8% | Added |
| Norges Bank | 2,160,728 | $51.0M | 0.01% | +444,222+25.9% | Added |
| Morgan Stanley | 2,177,222 | $51.4M | 0.00% | +84,374+4.0% | Added |
| Discovery Capital Management, LLC | 2,299,130 | $54.3M | 4.26% | −331,800−12.6% | Reduced |
| Ruane, Cunniff & Goldfarb L.P. | 2,441,743 | $57.6M | 0.99% | +48,704+2.0% | Added |
| Geode Capital Management, LLC | 2,513,161 | $59.4M | 0.00% | +213,164+9.3% | Added |
| Thompson Siegel & Walmsley LLC | 2,786,913 | $65.8M | 1.11% | −539,465−16.2% | Reduced |
| Kovitz Investment Group Partners, LLC | 3,000,670 | $70.8M | 0.30% | −74,635−2.4% | Reduced |
| Van Eck Associates Corp | 3,068,158 | $72.4M | 0.08% | +464,594+17.8% | Added |
| FMR LLC | 4,573,930 | $108.0M | 0.01% | +164,981+3.7% | Added |
| Millennium Management LLC | 4,666,215 | $110.2M | 0.10% | +2,654,423+131.9% | Added |
| Frontier Capital Management Co LLC | 5,460,743 | $128.9M | 1.19% | +1,882,011+52.6% | Added |
| State Street Corp | 7,078,249 | $167.1M | 0.01% | +501,898+7.6% | Added |
| Primecap Management Co | 12,030,656 | $284.0M | 0.23% | +1,969,067+19.6% | Added |
| Vanguard Group Inc | 16,533,825 | $390.4M | 0.01% | +191,265+1.2% | Added |
| BlackRock, Inc. | 18,995,083 | $448.5M | 0.01% | +746,094+4.1% | Added |
| Invesco Ltd. | 19,577,241 | $462.2M | 0.08% | +2,386,131+13.9% | Added |
| American Securities LLC | 45,026,743 | $1.06B | 100.00% | +1,132,839+2.6% | Added |
| Balyasny Asset Management LLC | 0 | $0 | 0.00% | −1,880,887−100.0% | Sold out |
| Cooper Creek Partners Management LLC | 0 | $0 | 0.00% | −1,223,986−100.0% | Sold out |
| Ghisallo Capital Management LLC | 0 | $0 | 0.00% | −635,569−100.0% | Sold out |
| Jane Street Group, LLC | 0 | $0 | 0.00% | −601,760−100.0% | Sold out |
| Davidson Kempner Capital Management LP | 0 | $0 | 0.00% | −450,000−100.0% | Sold out |
| Monashee Investment Management LLC | 0 | $0 | 0.00% | −360,000−100.0% | Sold out |
| Castalian Partners, LLC | 0 | $0 | 0.00% | −304,500−100.0% | Sold out |
| Twinbeech Capital LP | 0 | $0 | 0.00% | −225,438−100.0% | Sold out |
| Eisler Capital Management Ltd. | 0 | $0 | 0.00% | −126,889−100.0% | Sold out |
| Seven Grand Managers, LLC | 0 | $0 | 0.00% | −100,000−100.0% | Sold out |
| Walleye Trading LLC | 0 | $0 | 0.00% | −68,470−100.0% | Sold out |
| Caption Management, LLC | 0 | $0 | 0.00% | −68,400−100.0% | Sold out |
| Centiva Capital, LP | 0 | $0 | 0.00% | −65,258−100.0% | Sold out |
| Wolf Hill Capital Management, LP | 0 | $0 | 0.00% | −63,857−100.0% | Sold out |
| Weiss Asset Management LP | 0 | $0 | 0.00% | −60,953−100.0% | Sold out |
| Engineers Gate Manager LP | 0 | $0 | 0.00% | −53,830−100.0% | Sold out |
| Simplex Trading, LLC | 0 | $0 | 0.00% | −52,827−100.0% | Sold out |
| Freestone Capital Holdings, LLC | 0 | $0 | 0.00% | −40,027−100.0% | Sold out |
| Allianz Asset Management GmbH | 0 | $0 | 0.00% | −38,700−100.0% | Sold out |
| Sig Brokerage, LP | 0 | $0 | 0.00% | −35,052−100.0% | Sold out |
| Wolverine Trading, LLC | 0 | $0 | 0.00% | −32,816−100.0% | Sold out |
| ABS Direct Equity Fund LLC | 0 | $0 | 0.00% | −32,500−100.0% | Sold out |
| Renaissance Technologies LLC | 0 | $0 | 0.00% | −31,400−100.0% | Sold out |
| Gsa Capital Partners LLP | 0 | $0 | 0.00% | −30,488−100.0% | Sold out |
| Quantbot Technologies LP | 0 | $0 | 0.00% | −28,362−100.0% | Sold out |
| Carlson Capital L P | 0 | $0 | 0.00% | −28,000−100.0% | Sold out |
| Two Sigma Advisers, LP | 0 | $0 | 0.00% | −25,500−100.0% | Sold out |
| Quest Partners LLC | 0 | $0 | 0.00% | −23,780−100.0% | Sold out |
| Kirtland Hills Capital Management, LLC | 0 | $0 | 0.00% | −18,542−100.0% | Sold out |
| Jacobs Levy Equity Management, Inc | 0 | $0 | 0.00% | −17,533−100.0% | Sold out |
| Armstrong Henry H Associates Inc | 0 | $0 | 0.00% | −17,081−100.0% | Sold out |
| Paralel Advisors LLC | 0 | $0 | 0.00% | −16,329−100.0% | Sold out |
| Walleye Capital LLC | 0 | $0 | 0.00% | −14,069−100.0% | Sold out |
| Clear Street Markets LLC | 0 | $0 | 0.00% | −13,062−100.0% | Sold out |
| Rangeley Capital, LLC | 0 | $0 | 0.00% | −12,500−100.0% | Sold out |
| Evoke Wealth, LLC | 0 | $0 | 0.00% | −12,235−100.0% | Sold out |
| One68 Global Capital, LLC | 0 | $0 | 0.00% | −12,000−100.0% | Sold out |
| Prelude Capital Management, LLC | 0 | $0 | 0.00% | −11,360−100.0% | Sold out |
| Caldwell Investment Management Ltd. | 0 | $0 | 0.00% | −11,000−100.0% | Sold out |