StockSEC filings
Amentum Holdings, Inc. (AMTM): Insider Trades and Fund Holdings
What insiders and tracked funds have reported about Amentum Holdings, Inc. in SEC filings.
0Insider buys, 12 months
$0Bought by insiders, 12 months
$0Sold by insiders, 12 months
3Tracked funds holding
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Tracked funds that report AMTM
From each fund's latest 13F. Holdings are as of quarter end and are filed up to 45 days later.
| Fund | Shares | Value | Change |
|---|---|---|---|
| Ruane, Cunniff & Goldfarb | 537,213 | $11.1M | ▼ −66.9% |
| Soros Fund Management | 118,276 | $2.44M | ▲ +9.9% |
| Bridgewater Associates | 47,223 | $976K | ▲ +176.9% |
Source: SEC Form 13F-HR filings, retrieved Oct 28, 2026. How we read filings
Reading these numbers
Insiders sell for many reasons: taxes, diversification, a house. Purchases with their own money are rarer and are usually read as more informative. A Form 4 is due within two business days of the trade. How to read a Form 4 →