Amentum Holdings, Inc. (AMTM) Insider Trading
Directors, officers and holders of more than 10% of AMTM report their trades in its stock on SEC Form 4, within two business days. Each row below is one Form 4 transaction line. The one-letter code says what kind of transaction it was: only P (purchase) and S (sale) are open-market or private trades; awards, option exercises, tax withholding and gifts carry other codes.
Recent Form 4 transactions
The 50 most recent of 165 transactions on file: 0 with code P, 0 with code S and 50 with other codes.
| Date | Insider | Title | Code | Shares | Price | Value |
|---|---|---|---|---|---|---|
| Aug 14, 2026 | Thompson Christopher M.T. | Director | G Gift | 4,250 | Not measured | Not measured |
| May 6, 2026 | Johnson Travis Barton | Chief Financial Officer | F Tax Payment | 4,097 | $24.89 | $101,974 |
| May 6, 2026 | Heller John E. | Chief Executive Officer | M Exercise | 18,145 | Not measured | Not measured |
| May 6, 2026 | Bruning Jill L | Chief Technology Officer | F Tax Payment | 2,731 | $24.89 | $67,975 |
| May 6, 2026 | Johnson Travis Barton | Chief Financial Officer | M Exercise | 13,609 | Not measured | Not measured |
| May 6, 2026 | Mullen Sean Thomas | Chief Growth Officer | M Exercise | 9,072 | Not measured | Not measured |
| May 6, 2026 | Arnette Stephen A | Chief Operating Officer | F Tax Payment | 3,314 | $24.89 | $82,485 |
| May 6, 2026 | Heller John E. | Chief Executive Officer | M Exercise | 18,145 | Not measured | Not measured |
| May 6, 2026 | Arnette Stephen A | Chief Operating Officer | M Exercise | 13,609 | Not measured | Not measured |
| May 6, 2026 | Johnson Travis Barton | Chief Financial Officer | M Exercise | 13,609 | Not measured | Not measured |
| May 6, 2026 | Mullen Sean Thomas | Chief Growth Officer | F Tax Payment | 2,762 | $24.89 | $68,746 |
| May 6, 2026 | Bruning Jill L | Chief Technology Officer | M Exercise | 9,072 | Not measured | Not measured |
| May 6, 2026 | Bruning Jill L | Chief Technology Officer | M Exercise | 9,072 | Not measured | Not measured |
| May 6, 2026 | Arnette Stephen A | Chief Operating Officer | M Exercise | 13,609 | Not measured | Not measured |
| May 6, 2026 | Heller John E. | Chief Executive Officer | F Tax Payment | 8,184 | $24.89 | $203,700 |
| May 6, 2026 | Mullen Sean Thomas | Chief Growth Officer | M Exercise | 9,072 | Not measured | Not measured |
| Mar 4, 2026 | Bruning Jill L | Chief Technology Officer | G Gift | 30,000 | Not measured | Not measured |
| Mar 2, 2026 | Arnette Stephen A | Chief Operating Officer | M Exercise | 2,808 | Not measured | Not measured |
| Mar 2, 2026 | Arnette Stephen A | Chief Operating Officer | F Tax Payment | 750 | $30.70 | $23,025 |
| Mar 2, 2026 | Arnette Stephen A | Chief Operating Officer | M Exercise | 2,808 | Not measured | Not measured |
| Feb 17, 2026 | St. Mary Michele T | Chief Legal Officer & GC | M Exercise | 7,080 | Not measured | Not measured |
| Feb 17, 2026 | St. Mary Michele T | Chief Legal Officer & GC | F Tax Payment | 2,308 | $30.05 | $69,355 |
| Feb 17, 2026 | St. Mary Michele T | Chief Legal Officer & GC | M Exercise | 7,080 | Not measured | Not measured |
| Feb 6, 2026 | Rowland Sandra E. | Director | M Exercise | 11,564 | Not measured | Not measured |
| Feb 6, 2026 | EBERHART RALPH E | Director | A Award | 5,062 | Not measured | Not measured |
| Feb 6, 2026 | Brooks Vincent K | Director | M Exercise | 11,564 | Not measured | Not measured |
| Feb 6, 2026 | Vollmer John C. | Director | A Award | 5,062 | Not measured | Not measured |
| Feb 6, 2026 | Rowland Sandra E. | Director | A Award | 5,062 | Not measured | Not measured |
| Feb 6, 2026 | EBERHART RALPH E | Director | M Exercise | 11,564 | Not measured | Not measured |
| Feb 6, 2026 | IRELAND SUSAN LESLIE | Director | A Award | 5,062 | Not measured | Not measured |
| Feb 6, 2026 | Vollmer John C. | Director | M Exercise | 11,564 | Not measured | Not measured |
| Feb 6, 2026 | Thompson Christopher M.T. | Director | A Award | 5,062 | Not measured | Not measured |
| Feb 6, 2026 | Loughran Barbara | Director | A Award | 5,062 | Not measured | Not measured |
| Feb 6, 2026 | EBERHART RALPH E | Director | M Exercise | 11,564 | Not measured | Not measured |
| Feb 6, 2026 | Vollmer John C. | Director | M Exercise | 11,564 | Not measured | Not measured |
| Feb 6, 2026 | Brooks Vincent K | Director | A Award | 5,062 | Not measured | Not measured |
| Feb 6, 2026 | Brooks Vincent K | Director | M Exercise | 11,564 | Not measured | Not measured |
| Feb 6, 2026 | Rowland Sandra E. | Director | M Exercise | 11,564 | Not measured | Not measured |
| Jan 28, 2026 | Heller John E. | Chief Executive Officer | M Exercise | 51,979 | Not measured | Not measured |
| Jan 28, 2026 | Heller John E. | Chief Executive Officer | M Exercise | 51,979 | Not measured | Not measured |
| Jan 28, 2026 | Heller John E. | Chief Executive Officer | F Tax Payment | 19,768 | $35.71 | $705,915 |
| Dec 17, 2025 | Mullen Sean Thomas | Chief Growth Officer | M Exercise | 9,298 | Not measured | Not measured |
| Dec 17, 2025 | Mullen Sean Thomas | Chief Growth Officer | M Exercise | 9,298 | Not measured | Not measured |
| Dec 17, 2025 | Mullen Sean Thomas | Chief Growth Officer | F Tax Payment | 4,194 | $28.67 | $120,242 |
| Dec 5, 2025 | Burton Darren | Chief People Officer | M Exercise | 2,721 | Not measured | Not measured |
| Dec 5, 2025 | Burton Darren | Chief People Officer | F Tax Payment | 1,392 | $28.88 | $40,201 |
| Dec 5, 2025 | Burton Darren | Chief People Officer | M Exercise | 2,721 | Not measured | Not measured |
| Nov 17, 2025 | Arnette Stephen A | Chief Operating Officer | M Exercise | 1,178 | Not measured | Not measured |
| Nov 17, 2025 | Arnette Stephen A | Chief Operating Officer | M Exercise | 1,178 | Not measured | Not measured |
| Nov 17, 2025 | St. Mary Michele T | Chief Legal Officer & GC | A Award | 22,271 | Not measured | Not measured |
The full Form 4 history is on the AMTM company page (Insider Trades card, View all).
Questions about this data
Which insider transactions are open-market trades?
Code P (open market or private purchase) and code S (open market or private sale). Code F is shares withheld to pay tax on vesting stock, A is an award from the company, M and X are option exercises and G is a gift. None of those is the insider choosing to buy or sell in the market.
How quickly are insider trades reported?
A Form 4 is due before the end of the second business day after the trade. The date shown is the transaction date from the form.
Who has to file Form 4?
Officers, directors and beneficial owners of more than 10% of a class of the company’s registered equity, under Section 16 of the Securities Exchange Act.
Look up any code in the Form 4 transaction code reference, or read Form 4 codes explained.