Who owns Amentum Holdings, Inc.?
Institutional ownership of AMTM from SEC Form 13F filings across 302 reporting managers. All positions are from one synchronized reporting period — 2026-06-30 books, filed up to 45 days after quarter end — so every row is comparable.
302
13F holders
$2.69B
value, 2026 filers
58.4%
of shares outstanding (142.6M sh)
43
new positions (2026 filers)
Top institutional holders
ordered by shares owned · positions as of 2026-06-30· % of fund = share of the manager's own book · % of co. = share of AMTM's shares outstanding
| # | Manager | Shares | Value | % of fund | % of co. | Δ shares QoQ |
|---|---|---|---|---|---|---|
| 1 | Invesco Ltd. | 25.0M | $515.8M | 0.0% | 10.2% | +16.2% |
| 2 | BlackRock, Inc. | 17.9M | $370.1M | 0.0% | 7.3% | +0.4% |
| 3 | PRIMECAP MANAGEMENT CO/CA/ | 12.3M | $253.9M | 0.2% | 5% | +1.7% |
| 4 | Legacy Advisors, LLC | 9.1M | $9.1M | 0.8% | 3.7% | 0.0% |
| 5 | VANGUARD PORTFOLIO MANAGEMENT LLC | 7.9M | $164.3M | 0.0% | 3.3% | +1.2% |
| 6 | VANGUARD CAPITAL MANAGEMENT LLC | 6.7M | $138.7M | 0.0% | 2.7% | -49.5% |
| 7 | FMR LLC | 5.7M | $117.4M | 0.0% | 2.3% | +1.8% |
| 8 | Verition Fund Management LLC | 4.0M | $83.5M | 0.4% | 1.7% | +211.2% |
| 9 | Troluce Capital Advisors LLC | 3.6M | $73.7M | 7.6% | 1.5% | +256.5% |
| 10 | GEODE CAPITAL MANAGEMENT, LLC | 2.7M | $56.2M | 0.0% | 1.1% | -3.5% |
| 11 | GOLDMAN SACHS GROUP INC | 2.7M | $56.1M | 0.0% | 1.1% | +139.7% |
| 12 | MORGAN STANLEY | 2.7M | $55.0M | 0.0% | 1.1% | +19.1% |
| 13 | MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. | 2.3M | $47.9M | 0.1% | 0.9% | -16.8% |
| 14 | MILLENNIUM MANAGEMENT LLC | 2.1M | $44.0M | 0.0% | 0.9% | +237.2% |
| 15 | Sixth Street Partners Management Company, L.P.NEW | 2.1M | $43.8M | 7.6% | 0.9% | new |
| 16 | CHARLES SCHWAB INVESTMENT MANAGEMENT INC | 2.1M | $43.8M | 0.0% | 0.9% | +2.5% |
| 17 | Thrivent Financial for Lutherans | 2.1M | $43,527 | 0.1% | 0.9% | +0.3% |
| 18 | BANK OF AMERICA CORP /DE/ | 2.0M | $42.2M | 0.0% | 0.8% | -15.1% |
| 19 | VAN ECK ASSOCIATES CORP | 2.0M | $41.1M | 0.0% | 0.8% | +263.2% |
| 20 | VOYA INVESTMENT MANAGEMENT LLC | 2.0M | $40.8M | 0.0% | 0.8% | +64.6% |
| 21 | UBS Group AG | 1.5M | $31.9M | 0.0% | 0.6% | -9.7% |
| 22 | NORGES BANKNEW | 1.5M | $31.3M | 0.0% | 0.6% | new |
| 23 | Public Sector Pension Investment Board | 1.1M | $21.9M | 0.1% | 0.4% | +92.4% |
| 24 | Qube Research & Technologies Ltd | 1.0M | $21.4M | 0.0% | 0.4% | +1237.0% |
| 25 | NORTHERN TRUST CORP | 1.0M | $21.3M | 0.0% | 0.4% | +4.7% |
Source: SEC Form 13F-HR filings (institutional managers over $100M in US-listed positions). 13Fs disclose long positions only, up to 45 days after quarter end; each manager's latest filed quarter is shown per row and dollar values are the manager's filed marks. Aggregates labeled "2026 filers" count only managers whose latest book is a 2026 quarter. Related: valuation · options positioning · supply chain. Research, not investment advice.