Amentum Holdings
AMTM · NYSE
$19.87+$0.39 (+2.00%)TodayMarket closed ·
Prev close $19.48
Who owns AMTM
Largest institutional holders, from their latest 13F filings
The 10 largest institutions hold 71.4% of AMTM’s shares.
- American Securities LLC18.0%
- Goldberg Lindsay & Co., LLC18.0%
- Jacobs Solutions Inc7.5%
- The Vanguard Group, Inc.6.8%
- Next 6 largest institutions21.2%
- All other shareholders28.6%
| Holder | Shares | % of shares |
|---|---|---|
| American Securities LLC | 43.89M | 17.97% |
| Goldberg Lindsay & Co., LLC | 43.89M | 17.97% |
| Jacobs Solutions Inc | 18.25M | 7.47% |
| The Vanguard Group, Inc. | 16.51M | 6.76% |
| Kovitz Investment Group Partners, LLC | 14.79M | 6.05% |
| BlackRock Institutional Trust Company, N.A. | 13.91M | 5.69% |
| State Street Global Advisors (US) | 6.45M | 2.64% |
| PRIMECAP Management Company | 6.41M | 2.63% |
| INVESCO Asset Management (Japan) Ltd. | 6.17M | 2.52% |
| Cooper Creek Partners Management LLC | 4.16M | 1.70% |
Largest mutual fund holders
| Holder | Shares | % of shares |
|---|---|---|
| iShares Core S&P Small-Cap ETF | 9.38M | 3.84% |
| Vanguard PRIMECAP Core Fund | 5.52M | 2.26% |
| Vanguard Total Stock Market Index Fund | 4.67M | 1.91% |
| Invesco Small Cap Value Fund | 4.23M | 1.73% |
| Vanguard Small-Cap Index Fund | 3.37M | 1.38% |
Insider trades
Form 4 filings by officers, directors and large holders
Insiders made no open-market buys or sales of AMTM in the last 6 months.
| Insider | Type | Shares | Value |
|---|---|---|---|
| Thompson Christopher M.T. | Gift | 4.25K | — |
| Bruning Jill L | Option exercise | 9.07K | — |
| Bruning Jill L | Tax withholding | 2.73K | $67.97K |
| Bruning Jill L | Option exercise | 9.07K | — |
| Arnette Stephen A | Option exercise | 13.61K | — |
| Arnette Stephen A | Tax withholding | 3.31K | $82.49K |
| Arnette Stephen A | Option exercise | 13.61K | — |
| Johnson Travis Barton | Option exercise | 13.61K | — |
| Johnson Travis Barton | Tax withholding | 4.10K | $101.97K |
| Johnson Travis Barton | Option exercise | 13.61K | — |
Short interest
Settled Sep 30, 2026
- Shares short
- 12.33M
- Days to cover
- 6.79
- % of shares outstanding
- 5.05%
- Average daily volume
- 1.82M
- Change since last report
- +0.8%
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