Who owns Amentum Holdings Inc (AMTM)?
156 US mutual funds and ETFs from 82 fund families reported a position in AMTM for the quarter ending 2026-06-30. Against their own report a quarter earlier, 50 raised shares, 10 opened a new position, 48 cut and 11 sold out.
Largest fund families
| Fund family | Funds | Share of fund-held shares |
|---|---|---|
| Ishares Trust | 10 | 29.2% |
| Vanguard Index Funds | 4 | 28.5% |
| Vanguard Fenway Funds | 1 | 13.2% |
| Vanguard Horizon Funds | 1 | 6.0% |
| Spdr Series Trust | 6 | 5.4% |
| Vanguard Tax-Managed Funds | 3 | 2.8% |
Tracked managers holding AMTM
None of the managers Prior Moves tracks on 13F reports AMTM in its latest filing.
Source: SEC Form N-PORT, which funds file about 60 days after quarter end, and the latest 13F filings. Share counts, not trades: a change can reflect fund inflows or outflows rather than a decision about AMTM. A record of holdings, not a forecast and not investment advice. See all owner pages or the forecast board for the names our model ranks.
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