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Amentum Holdings, Inc. (New York Stock Exchange:AMTM)
US · Delayed Price · Currency is USD
22.29+0.53 (+2.44%)
Insider Score
––Not scored
AMTM Insider Score
Insiders here have filed 1 Form 4 in the last 90 days, but all of them are share awards, grants or other non-market transactions. Those are compensation, not a decision to buy, so they are not scored.
AMTM Stock Insider Trading Activity
AMTM stock’s insider trading shows no open-market insider trades by company insiders over the last 6 months.
Not enough price history.
Insider Trading Activity (Form 4 Filings)
An insider trade occurs when an individual that has non-public information about a company buys or sells shares of that company’s stock. Examples of insiders include a company’s executive officers (CEO, CFO, COO), its board of directors, and its major shareholders. Insiders are required to submit their trading activity to the SEC through Form 4 filings.
| Insider | Action | Shares | Avg Cost | Total | Δ Holdings | Held After | Date | Grade | Form 4 |
|---|---|---|---|---|---|---|---|---|---|
| Thompson Christopher M.T. Director | Gift | 4,250 | — | — | 42.5% | 5,750 | Aug 14, 2026 | — | Form 4 |
| Heller John E. CEO | Option exercise | 18,145 | — | — | 5.0% | 384,203 | May 6, 2026 | — | Form 4 |
| Heller John E. CEO | Tax withheld | 8,184 | $24.89 | $203.70K | 2.1% | 376,019 | May 6, 2026 | — | Form 4 |
| Mullen Sean Thomas Other | Tax withheld | 2,762 | $24.89 | $68.75K | 7.8% | 32,448 | May 6, 2026 | — | Form 4 |
| Mullen Sean Thomas Other | Option exercise | 9,072 | — | — | 34.7% | 35,210 | May 6, 2026 | — | Form 4 |
| Johnson Travis Barton CFO | Tax withheld | 4,097 | $24.89 | $101.97K | 3.4% | 118,187 | May 6, 2026 | — | Form 4 |
| Johnson Travis Barton CFO | Option exercise | 13,609 | — | — | 12.5% | 122,284 | May 6, 2026 | — | Form 4 |
| Bruning Jill L Other | Option exercise | 9,072 | — | — | 4.7% | 200,188 | May 6, 2026 | — | Form 4 |
| Arnette Stephen A COO | Option exercise | 13,609 | — | — | 14.1% | 109,966 | May 6, 2026 | — | Form 4 |
| Arnette Stephen A COO | Tax withheld | 3,314 | $24.89 | $82.49K | 3.0% | 106,652 | May 6, 2026 | — | Form 4 |
| Bruning Jill L Other | Tax withheld | 2,731 | $24.89 | $67.97K | 1.4% | 197,457 | May 6, 2026 | — | Form 4 |
| Bruning Jill L Other | Gift | 30,000 | — | — | 13.6% | 190,999 | Mar 4, 2026 | — | Form 4 |
| Arnette Stephen A COO | Tax withheld | 750 | $30.70 | $23.02K | 0.8% | 96,357 | Mar 2, 2026 | — | Form 4 |
| Arnette Stephen A COO | Option exercise | 2,808 | — | — | 3.0% | 97,107 | Mar 2, 2026 | — | Form 4 |
| St. Mary Michele T Other | Option exercise | 7,080 | — | — | 31.8% | 29,351 | Feb 17, 2026 | — | Form 4 |
| St. Mary Michele T Other | Tax withheld | 2,308 | $30.05 | $69.36K | 7.9% | 27,043 | Feb 17, 2026 | — | Form 4 |
| Brooks Vincent K Director | Award | 5,062 | — | — | 22.6% | 27,462 | Feb 6, 2026 | — | Form 4 |
| Brooks Vincent K Director | Option exercise | 11,564 | — | — | 107% | 22,400 | Feb 6, 2026 | — | Form 4 |
| EBERHART RALPH E Director | Option exercise | 11,564 | — | — | 36.7% | 43,058 | Feb 6, 2026 | — | Form 4 |
| EBERHART RALPH E Director | Award | 5,062 | — | — | 11.8% | 48,120 | Feb 6, 2026 | — | Form 4 |
| Rowland Sandra E. Director | Award | 5,062 | — | — | 33.7% | 20,073 | Feb 6, 2026 | — | Form 4 |
| Rowland Sandra E. Director | Option exercise | 11,564 | — | — | 335% | 15,011 | Feb 6, 2026 | — | Form 4 |
| IRELAND SUSAN LESLIE Director | Award | 5,062 | — | — | 147% | 8,509 | Feb 6, 2026 | — | Form 4 |
| Loughran Barbara Director | Award | 5,062 | — | — | 110% | 9,662 | Feb 6, 2026 | — | Form 4 |
| Thompson Christopher M.T. Director | Award | 5,062 | — | — | New | 5,062 | Feb 6, 2026 | — | Form 4 |
| Vollmer John C. Director | Option exercise | 11,564 | — | — | 2.8% | 424,780 | Feb 6, 2026 | — | Form 4 |
| Vollmer John C. Director | Award | 5,062 | — | — | 1.2% | 429,842 | Feb 6, 2026 | — | Form 4 |
| Heller John E. CEO | Option exercise | 51,979 | — | — | 15.6% | 385,826 | Jan 28, 2026 | — | Form 4 |
What these mean— the action is the SEC’s own Form 4 transaction code. Only a buy or a sell is an open-market trade; the rest are transfers, awards and exercises, which is why they carry no price.
- Award (A) — Grant or award from the company, not a purchase
- Tax withheld (F) — Shares withheld to pay tax or an exercise price
- Option exercise (M) — Exercise or conversion of an exempt derivative
- Gift (G) — Bona fide gift
Disclaimer — Informational only — not investment advice. Insider transaction data is sourced from SEC Form 4 filings; market data from public feeds and may be delayed. The Insider Score is a proprietary score for research purposes and does not predict future performance. Always do your own research.