Amentum Holdings, Inc (AMTM) insider trading
Every open-market stock purchase and sale by Amentum Holdings, Inc executives, directors, large shareholders and members of Congress, from SEC Form 4 filings. Sector: Other.
Insider activity at a glance
- No open-market insider trades in the last 12 months.
- Last insider buy: Barbara Loughran (Director), $97.6K, 19 months ago.
Last 12 months: insiders bought $0 (0 buys) and sold $0 (0 sales). Last close $19.60 on Sep 18, 2026.
Recent AMTM insider trades
| Date | Insider | Trade | Value |
|---|---|---|---|
| Aug 14, 2026 | Christopher M.T. Thompson (Director) | Sold (not open market) | — |
| May 6, 2026 | John E. Heller (CEO) | Sold (not open market) | $204K |
| May 6, 2026 | Travis Barton Johnson (CFO) | Sold (not open market) | $102K |
| May 6, 2026 | Stephen A Arnette (COO) | Sold (not open market) | $82.5K |
| May 6, 2026 | Sean Thomas Mullen (C-suite exec) | Sold (not open market) | $68.7K |
| May 6, 2026 | Jill L Bruning (CTO) | Sold (not open market) | $68K |
| May 6, 2026 | Sean Thomas Mullen (C-suite exec) | Bought (not open market) | — |
| May 6, 2026 | Stephen A Arnette (COO) | Bought (not open market) | — |
| May 6, 2026 | Jill L Bruning (CTO) | Bought (not open market) | — |
| May 6, 2026 | John E. Heller (CEO) | Bought (not open market) | — |
| May 6, 2026 | Travis Barton Johnson (CFO) | Bought (not open market) | — |
| Mar 4, 2026 | Jill L Bruning (CTO) | Sold (not open market) | — |
| Mar 2, 2026 | Stephen A Arnette (COO) | Sold (not open market) | $23K |
| Mar 2, 2026 | Stephen A Arnette (COO) | Bought (not open market) | — |
| Feb 17, 2026 | Michele T St. Mary (C-suite exec) | Sold (not open market) | $69.4K |
| Feb 17, 2026 | Michele T St. Mary (C-suite exec) | Bought (not open market) | — |
| Feb 6, 2026 | Ralph E Eberhart (Director) | Bought (not open market) | — |
| Feb 6, 2026 | John C. Vollmer (Director) | Bought (not open market) | — |
| Feb 6, 2026 | John C. Vollmer (Director) | Bought (not open market) | — |
| Feb 6, 2026 | Susan Leslie Ireland (Director) | Bought (not open market) | — |
| Feb 6, 2026 | Ralph E Eberhart (Director) | Bought (not open market) | — |
| Feb 6, 2026 | Christopher M.T. Thompson (Director) | Bought (not open market) | — |
| Feb 6, 2026 | Vincent K Brooks (Director) | Bought (not open market) | — |
| Feb 6, 2026 | Vincent K Brooks (Director) | Bought (not open market) | — |
| Feb 6, 2026 | Sandra E. Rowland (Director) | Bought (not open market) | — |
Who's trading AMTM
- Christopher M.T. Thompson, Director: other filings, last Aug 14, 2026
- Sean Thomas Mullen, C-suite exec: other filings, last May 6, 2026
- Stephen A Arnette, COO: other filings, last May 6, 2026
- John E. Heller, CEO: other filings, last May 6, 2026
- Travis Barton Johnson, CFO: other filings, last May 6, 2026
- Jill L Bruning, CTO: other filings, last May 6, 2026
- Michele T St. Mary, C-suite exec: other filings, last Feb 17, 2026
- John C. Vollmer, Director: other filings, last Feb 6, 2026
- Vincent K Brooks, Director: other filings, last Feb 6, 2026
- Barbara Loughran, Director: other filings, last Feb 6, 2026
- Susan Leslie Ireland, Director: other filings, last Feb 6, 2026
- Sandra E. Rowland, Director: other filings, last Feb 6, 2026
- Ralph E Eberhart, Director: other filings, last Feb 6, 2026
- Darren Burton, C-suite exec: other filings, last Dec 5, 2025
- Steven J. Demetriou, Chair: other filings, last Nov 17, 2025
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