Updated Jul 16, 2026 · Last SEC filing 2026-05-07
Amentum Holdings, Inc. (AMTM) has filed 5 SEC Form 4 insider transactions in the last 90 days, with the most recent on 2026-05-07. 2 Form 8-K material event filings were reported by AMTM in the last 90 days. InsiderAlpha tracks every AMTM SEC filing — Form 4, Form 144, and 8-K — in real time, including Rule 10b5-1 plan detection.
| SEC CIK | 0002011286 |
|---|
| Form 4 filings (90d) | 5 |
|---|---|
| Form 8-K filings (90d) | 2 |
| Latest Form 4 filing | 2026-05-07 |
| Date | Insider | Role | Transaction | Shares | Price | Value | Filing |
|---|---|---|---|---|---|---|---|
| Johnson Travis Barton | Chief Financial Officer | F — Tax withholding / forfeiture | 4.1K | $24.89 | $102K | SEC | |
| Johnson Travis Barton | Chief Financial Officer | M — Option exercise | 13.6K | — | — | SEC | |
| Bruning Jill L | Chief Technology Officer | M — Option exercise | 9.1K | — | — | SEC | |
| Arnette Stephen A | Chief Operating Officer | F — Tax withholding / forfeiture | 3.3K | $24.89 | $82K | SEC | |
| Arnette Stephen A | Chief Operating Officer | M — Option exercise | 13.6K | — | — | SEC | |
| Bruning Jill L | Chief Technology Officer | F — Tax withholding / forfeiture | 2.7K | $24.89 | $68K | SEC | |
| Mullen Sean Thomas | Chief Growth Officer | F — Tax withholding / forfeiture | 2.8K | $24.89 | $69K | SEC | |
| Heller John E. | Chief Executive Officer | M — Option exercise | 18.1K | — | — | SEC | |
| Mullen Sean Thomas | Chief Growth Officer | M — Option exercise | 9.1K | — | — | SEC | |
| Heller John E. | Chief Executive Officer | F — Tax withholding / forfeiture | 8.2K | $24.89 | $204K | SEC | |
| Bruning Jill L | Chief Technology Officer | G — Bona-fide gift | 30.0K | $0.00 | — | SEC | |
| Arnette Stephen A | Chief Operating Officer | F — Tax withholding / forfeiture | 750 | $30.70 | $23K | SEC | |
| Arnette Stephen A | Chief Operating Officer | M — Option exercise | 2.8K | — | — | SEC | |
| St. Mary Michele T | Chief Legal Officer & GC | F — Tax withholding / forfeiture | 2.3K | $30.05 | $69K | SEC | |
| St. Mary Michele T | Chief Legal Officer & GC | M — Option exercise | 7.1K | — | — | SEC |
All transactions sourced from SEC EDGAR Form 4 filings for Amentum Holdings, Inc. (AMTM). Updated in real time as new filings are submitted to the SEC.
| Insider | Form 4 filings | Total transaction value |
|---|---|---|
| Heller John E. | 3 | $204K |
| Johnson Travis Barton | 3 | $102K |
| Arnette Stephen A | 3 | $82K |
| Bruning Jill L | 3 | $68K |
| Mullen Sean Thomas | 3 | $69K |
SEC Form 4 transactions are reported with a one-letter code indicating the type of transaction. Common codes you'll see in AMTM insider filings:
| P | Open-market purchase by the insider |
|---|---|
| S | Open-market sale by the insider |
| A | Grant, award, or other acquisition from the issuer |
| M | Exercise or conversion of derivative security (e.g. options) |
| F | Payment of exercise price or tax liability via share withholding |
| G | Bona-fide gift of securities |
| D | Disposition to the issuer (e.g. share buyback participation) |
| J | Other acquisition or disposition |
| X | Exercise of in-the-money or at-the-money derivative security |
| C | Conversion of derivative security |
| V | Transaction voluntarily reported earlier than required |
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