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, Q1 2025
Institutional positions in Amentum Holdings, Inc. as of Mar 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
- 418
- −22 vs. Q4 2024
- Shares held
- 191.7M
- +26.8M (+16.3%) vs. Q4 2024
- Total value
- $3.49B
- +$18.2M (+0.5%) vs. Q4 2024
- New holders
- 73
- 112 more added
- Sold out
- 95
- 151 more reduced
11 institutions that held it in Q4 2024 haven't filed for Q1 2025 yet. Not filing isn't selling, so they aren't counted as sold out or in the changes above.
Compare with Q4 2024: 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, Q1 2025
Shares, value and share of portfolio for each institution holding Amentum Holdings, Inc.; share changes are against Q4 2024.
| Institution | Shares | Value | % of portfolio | Change in shares | Action |
|---|---|---|---|---|---|
| Barclays PLC | 55,504 | $1.01M | 0.00% | −114,147−67.3% | Reduced |
| Teachers Retirement System of the State of Kentucky | 55,816 | $1.02M | 0.01% | +6,232+12.6% | Added |
| Advisors Asset Management, Inc. | 56,602 | $1.03M | 0.02% | −14,647−20.6% | Reduced |
| Natixis Advisors, L.P. | 56,858 | $1.03M | 0.00% | +33,686+145.4% | Added |
| Louisiana State Employees Retirement System | 58,400 | $1.06M | 0.02% | −1,600−2.7% | Reduced |
| Weiss Asset Management LP | 60,953 | $1.11M | 0.03% | +30,922+103.0% | Added |
| WSFS Capital Management, LLC | 62,372 | $1.14M | 0.07% | +2,898+4.9% | Added |
| Wolf Hill Capital Management, LP | 63,857 | $1.16M | 0.11% | +63,857 | New |
| Teacher Retirement System of Texas | 64,170 | $1.17M | 0.00% | −22,522−26.0% | Reduced |
| Centiva Capital, LP | 65,258 | $1.19M | 0.07% | −38,882−37.3% | Reduced |
| Kodai Capital Management LP | 65,540 | $1.19M | 0.05% | +65,540 | New |
| Hahn Capital Management LLC | 65,633 | $1.19M | 0.58% | −11,689−15.1% | Reduced |
| Illinois Municipal Retirement Fund | 66,507 | $1.21M | 0.02% | +66,507 | New |
| Treasurer of the State of North Carolina | 67,783 | $1.23M | 0.00% | +10,690+18.7% | Added |
| Caption Management, LLC | 68,400 | $1.24M | 0.06% | −41,451−37.7% | Reduced |
| Walleye Trading LLC | 68,470 | $1.25M | 0.04% | +35,698+108.9% | Added |
| Ancora Advisors, LLC | 68,770 | $1.25M | 0.03% | +68,705+105,700.0% | Added |
| State of Tennessee, Treasury Department | 75,568 | $1.38M | 0.01% | +33,045+77.7% | Added |
| State of Alaska, Department of Revenue | 79,345 | $1.44M | 0.02% | +8,898+12.6% | Added |
| Crestwood Advisors Group LLC | 80,559 | $1.47M | 0.03% | −12,963−13.9% | Reduced |
| JPMorgan Chase & Co | 87,714 | $1.60M | 0.00% | −25,960−22.8% | Reduced |
| Price T Rowe Associates Inc | 88,101 | $1.60M | 0.00% | +25,975+41.8% | Added |
| Nomura Holdings Inc | 89,943 | $1.64M | 0.01% | +75,380+517.6% | Added |
| North Growth Management Ltd. | 92,000 | $1.67M | 0.35% | +1,000+1.1% | Added |
| LPL Financial LLC | 93,022 | $1.69M | 0.00% | −25,760−21.7% | Reduced |
| Country Club Bank | 93,752 | $1.69M | 0.11% | +61,158+187.6% | Added |
| State of Wisconsin Investment Board | 95,714 | $1.74M | 0.00% | +21,091+28.3% | Added |
| Envestnet Asset Management Inc | 97,188 | $1.77M | 0.00% | −15,035−13.4% | Reduced |
| State of New Jersey Common Pension Fund D | 97,653 | $1.78M | 0.01% | +1,976+2.1% | Added |
| Alpine Global Management, LLC | 100,000 | $1.82M | 0.48% | +75,000+300.0% | Added |
| Seven Grand Managers, LLC | 100,000 | $1.82M | 0.42% | +100,000 | New |
| Group One Trading, L.P. | 104,684 | $1.91M | 0.08% | +18,648+21.7% | Added |
| State Board of Administration of Florida Retirement System | 114,636 | $2.09M | 0.00% | 00.0% | Unchanged |
| Winton Group Ltd | 116,680 | $2.12M | 0.13% | +51,932+80.2% | Added |
| Citigroup Inc | 117,809 | $2.14M | 0.00% | −209,953−64.1% | Reduced |
| Eisler Capital Management Ltd. | 126,889 | $2.31M | 0.07% | +126,889 | New |
| Keeley-Teton Advisors, LLC | 128,081 | $2.33M | 0.28% | +110,324+621.3% | Added |
| Janus Henderson Group PLC | 131,000 | $2.37M | 0.00% | +64,761+97.8% | Added |
| California State Teachers Retirement System | 131,174 | $2.39M | 0.00% | −245−0.2% | Reduced |
| New York State Teachers Retirement System | 138,486 | $2.52M | 0.01% | +14,364+11.6% | Added |
| Marshall Wace, LLP | 147,352 | $2.68M | 0.00% | +147,352 | New |
| Prudential Financial Inc | 137,754 | $2.70M | 0.00% | +15,180+12.4% | Added |
| Wealth Enhancement Advisory Services, LLC | 151,801 | $2.76M | 0.01% | +37,057+32.3% | Added |
| Grizzlyrock Capital, LLC | 164,226 | $2.99M | 2.71% | +164,226 | New |
| Raymond James Financial Inc | 180,572 | $3.29M | 0.00% | +95,010+111.0% | Added |
| California Public Employees Retirement System | 187,848 | $3.42M | 0.00% | −9,671−4.9% | Reduced |
| Hudson Value Partners, LLC | 188,283 | $3.43M | 1.29% | +188,283 | New |
| SEI Investments Co | 202,150 | $3.68M | 0.00% | −85,163−29.6% | Reduced |
| Twinbeech Capital LP | 225,438 | $4.10M | 0.07% | +225,438 | New |
| Russell Investments Group, Ltd. | 232,933 | $4.24M | 0.01% | +107,395+85.5% | Added |
| Comerica Bank | 248,718 | $4.53M | 0.02% | +199,931+409.8% | Added |
| Telos Capital Management, Inc. | 256,178 | $4.66M | 0.51% | −10,858−4.1% | Reduced |
| Swiss National Bank | 259,200 | $4.72M | 0.00% | −4,000−1.5% | Reduced |
| UBS Asset Management Americas Inc | 273,283 | $4.97M | 0.00% | −451−0.2% | Reduced |
| Nuveen, LLC | 287,801 | $5.24M | 0.00% | +287,801 | New |
| Verition Fund Management LLC | 290,706 | $5.29M | 0.03% | −30,210−9.4% | Reduced |
| Vident Advisory, LLC | 292,857 | $5.33M | 0.08% | +277,594+1,818.7% | Added |
| Castalian Partners, LLC | 304,500 | $5.54M | 24.34% | −695,500−69.6% | Reduced |
| Rhumbline Advisers | 310,103 | $5.64M | 0.01% | +14,919+5.1% | Added |
| Ameriprise Financial Inc | 331,597 | $6.04M | 0.00% | −27,630−7.7% | Reduced |
| Monashee Investment Management LLC | 360,000 | $6.55M | 0.78% | +360,000 | New |
| Legal & General Group Plc | 390,937 | $7.12M | 0.00% | −287,166−42.3% | Reduced |
| BW Gestao de Investimentos Ltda. | 394,400 | $7.18M | 0.81% | +394,400 | New |
| Arosa Capital Management LP | 406,900 | $7.41M | 4.91% | +56,900+16.3% | Added |
| CenterBook Partners LP | 414,574 | $7.55M | 0.48% | +343,268+481.4% | Added |
| Loomis Sayles & Co L P | 435,674 | $7.93M | 0.01% | +435,674 | New |
| Ci Investments Inc. | 443,581 | $8.07M | 0.03% | −199,534−31.0% | Reduced |
| Aristotle Capital Boston, LLC | 446,612 | $8.13M | 0.41% | −30,365−6.4% | Reduced |
| Goldman Sachs Group Inc | 447,578 | $8.15M | 0.00% | +175,353+64.4% | Added |
| Davidson Kempner Capital Management LP | 450,000 | $8.19M | 0.12% | +450,000 | New |
| Public Sector Pension Investment Board | 455,129 | $8.28M | 0.04% | +145,943+47.2% | Added |
| Moore Capital Management, LP | 498,264 | $9.07M | 0.30% | −93,926−15.9% | Reduced |
| Susquehanna International Group, LLP | 533,567 | $9.71M | 0.02% | −342,794−39.1% | Reduced |
| Loews Corp | 572,684 | $10.4M | 0.08% | +572,684 | New |
| Royal Bank of Canada | 582,195 | $10.6M | 0.00% | −36,708−5.9% | Reduced |
| Jane Street Group, LLC | 601,760 | $11.0M | 0.02% | +574,270+2,089.0% | Added |
| New York State Common Retirement Fund | 611,787 | $11.1M | 0.02% | +232,835+61.4% | Added |
| Voya Investment Management LLC | 628,154 | $11.4M | 0.01% | +224,039+55.4% | Added |
| Engine Capital Management, LP | 635,255 | $11.6M | 2.19% | +13,855+2.2% | Added |
| Ghisallo Capital Management LLC | 635,569 | $11.6M | 1.01% | +635,569 | New |
| CSM Advisors, LLC | 638,057 | $11.6M | 0.63% | −1,000−0.2% | Reduced |
| Principal Financial Group Inc | 712,172 | $13.0M | 0.01% | +110,123+18.3% | Added |
| Bank of New York Mellon Corp | 760,509 | $13.8M | 0.00% | +109,195+16.8% | Added |
| Cacti Asset Management LLC | 834,442 | $15.1M | 1.21% | +9,978+1.2% | Added |
| Northern Trust Corp | 854,423 | $15.6M | 0.00% | +12,204+1.4% | Added |
| Penn Capital Management Co Inc | 889,434 | $16.2M | 1.58% | +443,126+99.3% | Added |
| Avenir Corp | 904,162 | $16.5M | 1.73% | +710,692+367.3% | Added |
| Bank of America Corp | 968,538 | $17.6M | 0.00% | +359,693+59.1% | Added |
| 683 Capital Management, LLC | 1,013,000 | $18.4M | 1.87% | +588,000+138.4% | Added |
| Kopernik Global Investors, LLC | 1,077,495 | $19.6M | 2.03% | +311,513+40.7% | Added |
| Dimensional Fund Advisors LP | 1,113,654 | $20.3M | 0.01% | −40,476−3.5% | Reduced |
| Freestone Grove Partners LP | 1,164,835 | $21.2M | 0.22% | +1,164,835 | New |
| Cooper Creek Partners Management LLC | 1,223,986 | $22.3M | 0.72% | −2,933,048−70.6% | Reduced |
| UBS Group AG | 1,530,134 | $27.8M | 0.01% | +398,390+35.2% | Added |
| Charles Schwab Investment Management Inc | 1,549,158 | $28.2M | 0.01% | +284,901+22.5% | Added |
| Thrivent Financial for Lutherans | 1,621,324 | $29.5M | 0.06% | +9,528+0.6% | Added |
| Arvin Capital Management LP | 1,687,149 | $30.7M | 11.29% | +721,952+74.8% | Added |
| Norges Bank | 1,716,506 | $31.2M | 0.00% | +276,379+19.2% | Added |
| Balyasny Asset Management LLC | 1,880,887 | $34.2M | 0.09% | +1,880,887 | New |
| Millennium Management LLC | 2,011,792 | $36.6M | 0.04% | +815,218+68.1% | Added |