AMENTUM HOLDINGS INC (AMTM) Institutional Ownership Changes & 13F Activity
AMENTUM HOLDINGS INC (AMTM). Institutional ownership data tracks hedge funds, asset managers, and other institutional investors based on recent SEC Form 13F filings (Q2 2026). This page analyzes institutional buying and selling activity, new holdings, and sold-out positions in the latest reporting period. Notable filers include Invesco Ltd., Troluce Capital Advisors Llc, Goldman Sachs Group Inc, Millennium Management Llc, and Van Eck Associates Corp.
| Institution | Type | Change in shares | Change Position % | Shares | Reported stock balance | Portfolio quarter | Filing date |
|---|---|---|---|---|---|---|---|
| Envestnet Asset Management Inc | Sell | -12,189 | -19.8% | 49,420 | $1.02M | Q2 2026 | Sep 23, 2026 |
| State Street Corp | Buy | +72,731 | +1.4% | 5,151,772 | $106.49M | Q2 2026 | Sep 22, 2026 |
| Security National Bank Of Sioux City Iowa | Buy | +5,565 | +31.3% | 23,326 | $482.15K | Q2 2026 | Sep 18, 2026 |
| Security National Bank Of So Dak | Sell | -165 | -0.6% | 25,964 | $536.68K | Q2 2026 | Sep 18, 2026 |
| Manufacturers Life Insurance Company, The | Buy | +232,701 | +568.7% | 273,618 | $1.12M | Q2 2026 | Sep 09, 2026 |
| M&T Bank Corp | Sell | -9,610 | -100.0% | 0 | $0.00 | Q2 2026 | Sep 04, 2026 |
| Parkside Financial Bank & Trust | Buy | +11 | +2.0% | 559 | $11.56K | Q2 2026 | Sep 04, 2026 |
| Citadel Advisors Llc | Buy | +590,046 | +731.7% | 670,684 | $13.86M | Q2 2026 | Sep 02, 2026 |
| Brown, Lisle/Cummings, Inc. | Sell | -4 | -3.3% | 118 | $2.44K | Q2 2026 | Sep 02, 2026 |
| Cornerstone Financial Management Llc | Sell | -16 | -100.0% | 0 | $0.00 | Q2 2026 | Aug 28, 2026 |
| Corient Private Wealth Llc | Sell | -1,990 | -6.7% | 27,543 | $569.34K | Q2 2026 | Aug 27, 2026 |
| California State Teachers Retirement System | Sell | -1,332 | -0.7% | 183,223 | $3.79M | Q2 2026 | Aug 24, 2026 |
| Clifford Swan Investment Counsel Llc | Sell | -1,719 | -8.9% | 17,495 | $361.62K | Q2 2026 | Aug 20, 2026 |
| Mercer Global Advisors Inc | Sell | -2,478 | -16.0% | 12,996 | $268.63K | Q2 2026 | Aug 19, 2026 |
| Public Employees Retirement System Of Ohio | Sell | -2,378 | -5.0% | 45,464 | $939.74K | Q2 2026 | Aug 17, 2026 |
| Parvin Asset Management, Llc | Sell | -393 | -39.2% | 610 | $12.61K | Q2 2026 | Aug 17, 2026 |
| Transamerica Financial Advisors, Llc | Sell | -6 | -85.7% | 1 | $20.00 | Q2 2026 | Aug 17, 2026 |
| Invesco Ltd. | Buy | +24,954,251 | — | 24,954,251 | $515.80M | Q2 2026 | Aug 14, 2026 |
| Troluce Capital Advisors Llc | Buy | +2,565,399 | +256.5% | 3,565,399 | $73.70M | Q2 2026 | Aug 14, 2026 |
| Goldman Sachs Group Inc | Buy | +1,580,428 | +139.7% | 2,711,866 | $56.05M | Q2 2026 | Aug 14, 2026 |
| Millennium Management Llc | Buy | +1,496,724 | +237.2% | 2,127,779 | $43.98M | Q2 2026 | Aug 14, 2026 |
| Van Eck Associates Corp | Buy | +1,441,254 | +263.2% | 1,988,898 | $41.11M | Q2 2026 | Aug 14, 2026 |
| Sequoia Fund | Sell | -1,085,769 | -66.9% | 537,213 | $11.10M | Q2 2026 | Aug 14, 2026 |
| Point72 Asset Management, L.P. | Sell | -980,579 | -60.1% | 649,984 | $13.44M | Q2 2026 | Aug 14, 2026 |
| Qube Research & Technologies Ltd | Buy | +957,026 | +1237.0% | 1,034,395 | $21.38M | Q2 2026 | Aug 14, 2026 |
| Frontier Capital Management Co Llc | Sell | -786,239 | -15.9% | 4,143,971 | $85.66M | Q2 2026 | Aug 14, 2026 |
| Verition Fund Management Llc | Buy | +721,388 | +55.6% | 2,019,334 | $41.74M | Q2 2026 | Aug 14, 2026 |
| Hrt Financial Lp | Buy | +671,847 | — | 671,847 | $13.89M | Q2 2026 | Aug 14, 2026 |
| Two Sigma Investments, Lp | Sell | -615,909 | -68.4% | 284,268 | $5.88M | Q2 2026 | Aug 14, 2026 |
| Moore Capital Management, Lp | Sell | -508,514 | -58.2% | 365,096 | $7.55M | Q2 2026 | Aug 14, 2026 |
Frequently asked questions about AMTM activity
Which institutional owners are buying AMTM?
Institutional owners buying AMTM include investors who have either initiated new positions or increased their existing holdings based on recent SEC 13F filings. The activity table above highlights which funds added shares in the latest reporting periods and how their positions changed over time.
What does "buy" mean in AMTM activity?
"Buy" means an investor increased their reported position in AMTM compared to the prior reporting period. This reflects growing exposure to AMENTUM HOLDINGS INC (AMTM) rather than necessarily a brand-new position (though new positions also appear as buys when prior quantity was zero).
Is institutional interest in AMTM increasing?
Institutional interest in AMTM can be assessed by comparing the number of tracked funds adding or increasing positions versus those trimming or exiting across the periods shown. A higher number of additions typically signals increasing participation among large filers, but it should be read alongside position sizes and the full table.