Amentum HoldingsAMTM
13F holders, Q2 2026 (June 30)464holders −23
52new positions
73sold out
10famous investors
$19.85avg. 13F price*
At the end of Q2 2026, 464 institutions reported holding Amentum Holdings Inc. (AMTM) in their 13F filings, down 23 from Q1 2026. 52 opened new positions and 73 sold out. The largest holders were American Securities LLC ($930.7M), Invesco Ltd. ($515.8M) and BlackRock, Inc. ($370.1M). 10 famous investors held it, including George Soros (0.0% of Soros Fund Management's portfolio), Israel Englander (0.0% of Millennium Management's portfolio) and Steve Cohen (0.0% of Point72 Asset Management's portfolio).
- Company
- Amentum Holdings Inc.
- CUSIP
- 023939101
- Latest filing quarter
- Q2 2026
History
Number of 13F holders
Total Exit/New Position Q1 2026 → Q2 2026
| Institutions | Total Value | |
|---|---|---|
| New Positions | 52 | $58.3M |
| Exits | 73 | $157.2M |
All 13F filers, Q1 2026 → Q2 2026: 24,579,102 shares bought and 18,234,155 shares sold, net +6,344,947 shares. Counts holders who added, trimmed, opened or closed a position; split-adjusted.
Ownership 464 holders
| American Securities LLC | 24.79% | No change | 45,026,743 | $930.7M |
| Invesco Ltd. | 0.04% | Add +16.2% | 24,954,251 | $515.8M |
| BlackRock, Inc. | 0.01% | Add +0.4% | 17,906,984 | $370.1M |
| Primecap Management Co. | 0.15% | Add +1.7% | 12,285,504 | $253.9M |
| Vanguard Portfolio Management LLC | 0.01% | Add +1.2% | 7,948,385 | $164.3M |
| Vanguard Capital Management LLC | 0.00% | Add +0.9% | 6,711,987 | $138.7M |
| FMR LLC | 0.01% | Add +1.8% | 5,679,175 | $117.4M |
| Dimensional Fund Advisors LP | 0.02% | Add +46.2% | 5,537,696 | $114.5M |
| State Street Corp. | 0.00% | Add +1.4% | 5,151,772 | $106.5M |
| Frontier Capital Management Co. LLC | 0.80% | Reduce -15.9% | 4,143,971 | $85.7M |
| Troluce Capital Advisors LLC | 27.60% | Add +256.5% | 3,565,399 | $73.7M |
| Geode Capital Management, LLC | 0.00% | Reduce -3.5% | 2,716,560 | $56.2M |
| Goldman Sachs Group Inc. | 0.01% | Add +139.7% | 2,711,866 | $56.1M |
| Morgan Stanley | 0.00% | Add +19.1% | 2,662,329 | $55.0M |
| MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. | 0.06% | Reduce -16.8% | 2,318,581 | $47.9M |
| Thompson Siegel & Walmsley LLC | 0.85% | Add +49.5% | 2,281,945 | $47.2M |
| Millennium Management | 0.03% | Add +237.2% | 2,127,779 | $44.0M |
| Charles Schwab Investment Management Inc. | 0.01% | Add +2.5% | 2,120,102 | $43.8M |
| Thrivent Financial for Lutherans | 0.07% | Add +0.3% | 2,105,802 | $43.5M |
| Bank of America Corp. | 0.00% | Reduce -15.1% | 2,042,897 | $42.2M |
| Segra Capital Management, LLC | 9.68% | Add +26.4% | 2,037,890 | $42.1M |
| Verition Fund Management LLC | 0.32% | Add +55.6% | 2,019,334 | $41.7M |
| Van Eck Associates Corp. | 0.03% | Add +263.2% | 1,988,898 | $41.1M |
| Voya Investment Management LLC | 0.04% | Add +64.6% | 1,974,191 | $40.8M |
| UBS Group AG | 0.01% | Reduce -9.7% | 1,545,183 | $31.9M |
| Norges Bank | 0.00% | — | 1,516,193 | $31.3M |
| Permian Investment Partners, LP | 3.36% | Reduce -8.6% | 1,433,028 | $29.6M |
| 683 Capital Management, LLC | 2.19% | Add +41.9% | 1,100,000 | $22.7M |
| Loomis Sayles & Co. L P | 0.03% | Reduce -3.6% | 1,042,522 | $21.5M |
| Qube Research & Technologies Ltd | 0.02% | Add +1237.0% | 1,034,395 | $21.4M |
| Northern Trust Corp. | 0.00% | Add +4.7% | 1,029,892 | $21.3M |
| Vanguard Fiduciary Trust Co. | 0.00% | Add +2.2% | 968,451 | $20.0M |
| Cacti Asset Management LLC | 0.91% | No change | 881,692 | $18.2M |
| Bank of New York Mellon Corp | 0.00% | Reduce -3.4% | 878,084 | $18.2M |
| Russell Investments Group, Ltd. | 0.02% | Add +17.8% | 840,642 | $17.4M |
| Avenir Corp. | 2.04% | Reduce -3.5% | 811,726 | $16.8M |
| Wells Fargo & Company | 0.00% | Add +17.8% | 750,214 | $15.5M |
| Principal Financial Group Inc. | 0.01% | Reduce -0.3% | 742,381 | $15.3M |
| Ancora Advisors LLC | 0.29% | Add +1.8% | 715,652 | $14.8M |
| Royce & Associates LP | 0.12% | Add +26.9% | 697,368 | $14.4M |
| HRT Financial LP | 0.03% | New | 671,847 | $13.9M |
| Citadel Advisors | 0.01% | Add +731.7% | 670,684 | $13.9M |
| Point72 Asset Management | 0.02% | Reduce -60.1% | 649,984 | $13.4M |
| AQR Capital Management | 0.00% | Add +18.5% | 601,900 | $12.4M |
| First Trust Advisors LP | 0.01% | Add +140.2% | 547,907 | $11.3M |
| Ruane, Cunniff & Goldfarb L.P. | 0.17% | Reduce -66.9% | 537,213 | $11.1M |
| Public Sector Pension Investment Board | 0.03% | Reduce -3.8% | 528,821 | $10.9M |
| Loews Corp | 0.08% | New | 500,000 | $10.3M |
| Shapiro Capital Management LLC | 0.60% | New | 475,970 | $9.8M |
| First National Bank of Omaha | 0.27% | Add +91.9% | 475,992 | $9.7M |
| Legacy Advisors, LLC | 0.85% | Add +0.0% | 9,065,677 | $9.1M |
| Nuveen, LLC | 0.00% | Reduce -51.6% | 421,495 | $8.7M |
| Arvin Capital Management LP | 1.61% | Reduce -79.9% | 416,705 | $8.6M |
| Hotchkis & Wiley Capital Management LLC | 0.02% | Add +20.5% | 402,130 | $8.3M |
| Susquehanna Fundamental Investments, LLC | 0.15% | Add +81.1% | 394,370 | $8.2M |
| Boothbay Fund Management, LLC | 0.16% | Add +350.1% | 387,973 | $8.0M |
| De Lisle Partners LLP | 0.84% | Reduce -1.3% | 374,818 | $7.7M |
| Vident Advisory, LLC | 0.06% | Reduce -4.1% | 372,918 | $7.7M |
| Mawer Investment Management Ltd. | 0.05% | Add +10.7% | 369,557 | $7.6M |
| Moore Capital Management, LP | 0.18% | Reduce -58.2% | 365,096 | $7.5M |
| Legal & General Group Plc | 0.00% | Add +4.2% | 349,048 | $7.2M |
| Jane Street Group, LLC | 0.00% | Add +79.0% | 343,687 | $7.1M |
| Susquehanna International Group, LLP | 0.01% | Add +0.7% | 332,452 | $6.9M |
| CenterBook Partners LP | 0.33% | Add +128.8% | 328,766 | $6.8M |
| Ameriprise Financial Inc. | 0.00% | Reduce -3.1% | 319,479 | $6.6M |
| Grizzlyrock Capital, LLC | 4.60% | Add +10.1% | 318,363 | $6.6M |
| Swiss National Bank | 0.00% | Add +1.5% | 318,091 | $6.6M |
| Rovida Investment Management Ltd | 0.44% | No change | 315,000 | $6.5M |
| Aristotle Capital Boston, LLC | 0.43% | Reduce -10.8% | 307,836 | $6.4M |
| Exchange Traded Concepts, LLC | 0.03% | Add +3.5% | 305,286 | $6.3M |
| Two Sigma Investments, LP | 0.00% | Reduce -68.4% | 284,268 | $5.9M |
| Rhumbline Advisers | 0.00% | Reduce -5.4% | 284,060 | $5.9M |
| Fifth Third Bancorp | 0.01% | Add +3.1% | 281,815 | $5.8M |
| California Public Employees Retirement System | 0.00% | Reduce -3.9% | 266,383 | $5.5M |
| SG Americas Securities, LLC | 0.00% | Reduce -4.2% | 262,993 | $5.4M |
| Hudson Value Partners, LLC | 1.30% | Add +22.7% | 250,185 | $5.2M |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC | 0.00% | Add +0.7% | 249,725 | $5.2M |
| CSM Advisors, LLC | 0.11% | Add +200.1% | 243,814 | $5.0M |
| AWH Capital, L.P. | 3.34% | No change | 235,250 | $4.9M |
| ExodusPoint Capital Management, LP | 0.04% | New | 226,289 | $4.7M |
| Raymond James Financial Inc. | 0.00% | Reduce -8.7% | 224,399 | $4.6M |
| Hel Ved Capital Management Ltd | 0.62% | Add +19.9% | 214,000 | $4.4M |
| D. E. Shaw & Co. | 0.00% | Add +189.4% | 191,488 | $4.0M |
| Sei Investments Co. | 0.00% | Reduce -35.5% | 190,069 | $3.9M |
| Wedge Capital Management L L P | 0.06% | Add +14.1% | 187,832 | $3.9M |
| Verbena Value LP | 0.64% | New | 186,200 | $3.8M |
| Telos Capital Management, Inc. | 0.34% | Reduce -2.3% | 185,611 | $3.8M |
| California State Teachers Retirement System | 0.00% | Reduce -0.7% | 183,223 | $3.8M |
| North Growth Management Ltd. | 0.46% | Add +0.6% | 173,000 | $3.6M |
| OpenArc Corporate Advisory, LLC | 0.04% | Reduce -0.0% | 170,291 | $3.5M |
| Brevan Howard Capital Management LP | 0.05% | Add +116.8% | 167,354 | $3.5M |
| New York State Teachers Retirement System | 0.01% | Reduce -2.0% | 161,992 | $3.3M |
| Atom Investors LP | 0.30% | Add +605.1% | 160,876 | $3.3M |
| Gotham Asset Management | 0.01% | Reduce -70.0% | 156,113 | $3.2M |
| T. Rowe Price Associates Inc. | 0.00% | Add +4.7% | 152,081 | $3.1M |
| Barclays PLC | 0.00% | Add +224.2% | 151,780 | $3.1M |
| Soviero Asset Management, LP | 1.50% | Reduce -37.5% | 150,000 | $3.1M |
| Oppenheimer & Co. Inc. | 0.03% | Reduce -15.3% | 142,974 | $3.0M |
| Bryn Mawr Trust Advisors, LLC | 0.13% | Add +21.0% | 141,443 | $2.9M |
| Prudential Financial Inc. | 0.00% | Reduce -0.3% | 139,950 | $2.9M |
"% of holder's portfolio" is AMTM's weight in each manager's 13F, not the share of Amentum Holdings Inc. the manager owns.