AMTM · Amentum Holdings, Inc. · Insider Trading
Trades by corporate insiders — officers, directors and holders of more than 10% of the shares — disclosed to the SEC on Forms 4 and 5. Form 3 supplies initial ownership rather than a trade; Form 4 must be filed within two business days of the trade.
| Date | Insider | Role | Type | Security | Shares |
|---|---|---|---|---|---|
| 2026-08-14 | Thompson Christopher M.T. |
Director |
Gift↓
Filing footnotes — Common Stock (Indirect)
Mr. Thompson's filing was late due to an administrative oversight. On August 14, 2026, the reporting person transferred an LLC interest representing 4,250 shares of AMTM common stock to an immediate family for no consideration. |
Common Stock
(I)
|
4,250 |
| 2026-05-06 | Bruning Jill L |
Chief Technology Officer |
Convert↓
Filing footnotes — Restricted Stock Units (Direct)
Each restricted stock unit represents a contingent right to receive one share of AMTM common stock. One-half of the restricted stock units shall vest and be delivered on the 18th month and three-year anniversaries of the date of grant. |
Restricted Stock Units
|
9,072 |
| 2026-05-06 | Mullen Sean Thomas |
Chief Growth Officer |
Convert↑
Filing footnotes — Common Stock (Direct)
Represents distribution of AMTM common stock upon vesting of restricted stock units. |
Common Stock
|
9,072 |
| 2026-05-06 | Bruning Jill L |
Chief Technology Officer |
Convert↑
Filing footnotes — Common Stock (Direct)
Represents distribution of AMTM common stock upon vesting of restricted stock units. Includes 117 shares acquired under the employee stock purchase plan in March 2026. |
Common Stock
|
9,072 |
| 2026-05-06 | Arnette Stephen A |
Chief Operating Officer |
Convert↓
Filing footnotes — Restricted Stock Units (Direct)
Each restricted stock unit represents a contingent right to receive one share of AMTM common stock. One-half of the restricted stock units shall vest and be delivered on the 18th month and three-year anniversaries of the date of grant. |
Restricted Stock Units
|
13,609 |
| 2026-05-06 | Bruning Jill L |
Chief Technology Officer |
Tax↓
Filing footnotes — Common Stock (Direct)
Represents number of shares of AMTM common stock tendered for tax withholding upon vesting of restricted stock units. |
Common Stock
|
2,731 |
| 2026-05-06 | Heller John E. |
Director, Chief Executive Officer |
Convert↓
Filing footnotes — Restricted Stock Units (Direct)
Each restricted stock unit represents a contingent right to receive one share of AMTM common stock. One-half of the restricted stock units shall vest and be delivered on the 18th month and three-year anniversaries of the date of grant. |
Restricted Stock Units
|
18,145 |
| 2026-05-06 | Arnette Stephen A |
Chief Operating Officer |
Convert↑
Filing footnotes — Common Stock (Direct)
Represents distribution of AMTM common stock upon vesting of restricted stock units. |
Common Stock
|
13,609 |
| 2026-05-06 | Heller John E. |
Director, Chief Executive Officer |
Convert↑
Filing footnotes — Common Stock (Direct)
Represents distribution of AMTM common stock upon vesting of restricted stock units. |
Common Stock
|
18,145 |
| 2026-05-06 | Johnson Travis Barton |
Chief Financial Officer |
Convert↓
Filing footnotes — Restricted Stock Units (Direct)
Each restricted stock unit represents a contingent right to receive one share of AMTM common stock. One-half of the restricted stock units shall vest and be delivered on the 18th month and three-year anniversaries of the date of grant. |
Restricted Stock Units
|
13,609 |
| 2026-05-06 | Arnette Stephen A |
Chief Operating Officer |
Tax↓
Filing footnotes — Common Stock (Direct)
Represents number of shares of AMTM common stock tendered for tax withholding upon vesting of restricted stock units. |
Common Stock
|
3,314 |
| 2026-05-06 | Johnson Travis Barton |
Chief Financial Officer |
Tax↓
Filing footnotes — Common Stock (Direct)
Represents number of shares of AMTM common stock tendered for tax withholding upon vesting of restricted stock units. |
Common Stock
|
4,097 |
| 2026-05-06 | Mullen Sean Thomas |
Chief Growth Officer |
Convert↓
Filing footnotes — Restricted Stock Units (Direct)
Each restricted stock unit represents a contingent right to receive one share of AMTM common stock. One-half of the restricted stock units shall vest and be delivered on the 18th month and three-year anniversaries of the date of grant. |
Restricted Stock Units
|
9,072 |
| 2026-05-06 | Heller John E. |
Director, Chief Executive Officer |
Tax↓
Filing footnotes — Common Stock (Direct)
Represents number of shares of AMTM common stock tendered for tax withholding upon vesting of restricted stock units. |
Common Stock
|
8,184 |
| 2026-05-06 | Mullen Sean Thomas |
Chief Growth Officer |
Tax↓
Filing footnotes — Common Stock (Direct)
Represents number of shares of AMTM common stock tendered for tax withholding upon vesting of restricted stock. |
Common Stock
|
2,762 |
| 2026-05-06 | Johnson Travis Barton |
Chief Financial Officer |
Convert↑
Filing footnotes — Common Stock (Direct)
Represents a distribution of AMTM common stock upon vesting of restricted stock units. |
Common Stock
|
13,609 |
| 2026-03-04 | Bruning Jill L |
Chief Technology Officer |
Gift↓
|
Common Stock
|
30,000 |
| 2026-03-02 | Arnette Stephen A |
Chief Operating Officer |
Convert↓
Filing footnotes — Restricted Stock Units (Direct)
Each restricted stock unit represents a contingent right to receive one share of AMTM common stock. The restricted stock units awarded vested on March 2, 2026. |
Restricted Stock Units
|
2,808 |
| 2026-03-02 | Arnette Stephen A |
Chief Operating Officer |
Convert↑
Filing footnotes — Common Stock (Direct)
Represents distribution of AMTM common stock upon vesting of restricted stock units. |
Common Stock
|
2,808 |
| 2026-03-02 | Arnette Stephen A |
Chief Operating Officer |
Tax↓
Filing footnotes — Common Stock (Direct)
Represents number of shares of AMTM common stock tendered for tax withholding upon vesting of restricted stock units. |
Common Stock
|
750 |
| 2026-02-17 | St. Mary Michele T |
Chief Legal Officer & GC |
Convert↑
Filing footnotes — Common Stock (Direct)
Represents distribution of AMTM common stock upon vesting of restricted stock units. |
Common Stock
|
7,080 |
| 2026-02-17 | St. Mary Michele T |
Chief Legal Officer & GC |
Tax↓
Filing footnotes — Common Stock (Direct)
Represents number of shares of AMTM common stock tendered for tax withholding upon vesting of restricted stock units. |
Common Stock
|
2,308 |
| 2026-02-17 | St. Mary Michele T |
Chief Legal Officer & GC |
Convert↓
Filing footnotes — Restricted Stock Units (Direct)
Each restricted stock unit represents a contingent right to receive one share of AMTM common stock. Represents distribution of AMTM common stock upon vesting of restricted stock units. The restricted stock units awarded vested on February 17, 2026. |
Restricted Stock Units
|
7,080 |
| 2026-02-06 | Brooks Vincent K |
Director |
Award↑
Filing footnotes — Common Stock (Direct)
The restricted stock units shall vest on the date of the next annual meeting of stockholders of the Issuer. |
Common Stock
|
5,062 |
| 2026-02-06 | EBERHART RALPH E |
Director |
Award↑
Filing footnotes — Common Stock (Direct)
The restricted stock units shall vest on the date of the next annual meeting of stockholders of the Issuer. |
Common Stock
|
5,062 |
| 2026-02-06 | Loughran Barbara |
Director |
Award↑
Filing footnotes — Common Stock (Direct)
The restricted stock units shall vest on the date of the next annual meeting of stockholders of the Issuer. |
Common Stock
|
5,062 |
| 2026-02-06 | Rowland Sandra E. |
Director |
Award↑
Filing footnotes — Common Stock (Direct)
The restricted stock units shall vest on the date of the next annual meeting of stockholders of the Issuer. |
Common Stock
|
5,062 |
| 2026-02-06 | Vollmer John C. |
Director |
Convert↓
Filing footnotes — Restricted Stock Units (Direct)
Each restricted stock unit represents a contingent right to receive one share of AMTM common stock. The restricted stock units awarded vested on February 6, 2026. |
Restricted Stock Units
|
11,564 |
| 2026-02-06 | EBERHART RALPH E |
Director |
Convert↑
Filing footnotes — Common Stock (Direct)
Represents distribution of AMTM common stock upon vesting of restricted stock units. Reflects a non-reportable transaction for shares transferred from the pro-rata distribution in-kind by Jacobs Solutions Inc. to its shareholders for no consideration on May 30, 2025. |
Common Stock
|
11,564 |
| 2026-02-06 | Vollmer John C. |
Director |
Award↑
Filing footnotes — Common Stock (Direct)
The restricted stock units shall vest on the date of the next annual meeting of stockholders of the Issuer. |
Common Stock
|
5,062 |
| 2026-02-06 | Vollmer John C. |
Director |
Convert↑
Filing footnotes — Common Stock (Direct)
Represents distribution of AMTM common stock upon vesting of restricted stock units. Reflects a non-reportable transaction for shares transferred from the pro-rata distribution in-kind by Amentum Joint Venture LP to its partners for no consideration at the time of the transaction. |
Common Stock
|
11,564 |
| 2026-02-06 | Rowland Sandra E. |
Director |
Convert↓
Filing footnotes — Restricted Stock Units (Direct)
Each restricted stock unit represents a contingent right to receive one share of AMTM common stock. The restricted stock units awarded vested on February 6, 2026. |
Restricted Stock Units
|
11,564 |
| 2026-02-06 | Brooks Vincent K |
Director |
Convert↑
Filing footnotes — Common Stock (Direct)
Represents distribution of AMTM common stock upon vesting of restricted stock units. Reflects a non-reportable transaction for shares transferred from the pro-rata distribution in-kind by Jacobs Solutions Inc. to its shareholders for no consideration on May 30, 2025. |
Common Stock
|
11,564 |
| 2026-02-06 | Brooks Vincent K |
Director |
Convert↓
Filing footnotes — Restricted Stock Units (Direct)
Each restricted stock unit represents a contingent right to receive one share of AMTM common stock. The restricted stock units awarded vested on February 6, 2026. |
Restricted Stock Units
|
11,564 |
| 2026-02-06 | IRELAND SUSAN LESLIE |
Director |
Award↑
Filing footnotes — Common Stock (Direct)
The restricted stock units shall vest on the date of the next annual meeting of stockholders of the Issuer. |
Common Stock
|
5,062 |
| 2026-02-06 | EBERHART RALPH E |
Director |
Convert↓
Filing footnotes — Restricted Stock Units (Direct)
Each restricted stock unit represents a contingent right to receive one share of AMTM common stock. The restricted stock units awarded vested on February 6, 2026. |
Restricted Stock Units
|
11,564 |
| 2026-02-06 | Rowland Sandra E. |
Director |
Convert↑
Filing footnotes — Common Stock (Direct)
Represents distribution of AMTM common stock upon vesting of restricted stock units. |
Common Stock
|
11,564 |
| 2026-02-06 | Thompson Christopher M.T. |
Director |
Award↑
Filing footnotes — Common Stock (Direct)
The restricted stock units shall vest on the date of the next annual meeting of stockholders of the Issuer. |
Common Stock
|
5,062 |
| 2026-01-28 | Heller John E. |
Director, Chief Executive Officer |
Convert↓
Filing footnotes — Restricted Stock Units (Direct)
Each restricted stock unit represents a contingent right to receive one share of AMTM common stock. Represents distribution of AMTM common stock upon vesting of restricted stock units. The restricted stock units awarded vested on January 28, 2026. |
Restricted Stock Units
|
51,979 |
| 2026-01-28 | Heller John E. |
Director, Chief Executive Officer |
Tax↓
Filing footnotes — Common Stock (Direct)
Represents number of shares of AMTM common stock tendered for tax withholding upon vesting of restricted stock units. |
Common Stock
|
19,768 |
| 2026-01-28 | Heller John E. |
Director, Chief Executive Officer |
Convert↑
Filing footnotes — Common Stock (Direct)
Represents distribution of AMTM common stock upon vesting of restricted stock units. |
Common Stock
|
51,979 |
| 2025-12-17 | Mullen Sean Thomas |
Chief Growth Officer |
Tax↓
Filing footnotes — Common Stock (Direct)
Represents number of shares of AMTM common stock tendered for tax withholding upon vesting of restricted stock units. |
Common Stock
|
4,194 |
| 2025-12-17 | Mullen Sean Thomas |
Chief Growth Officer |
Convert↑
Filing footnotes — Common Stock (Direct)
Represents distribution of AMTM common stock upon vesting of restricted stock units. |
Common Stock
|
9,298 |
| 2025-12-17 | Mullen Sean Thomas |
Chief Growth Officer |
Convert↓
Filing footnotes — Restricted Stock Units (Direct)
Each restricted stock unit represents a contingent right to receive one share of AMTM common stock. Represents distribution of AMTM common stock upon vesting of restricted stock units. The restricted stock units awarded vested on December 17, 2025. |
Restricted Stock Units
|
9,298 |
| 2025-12-05 | Burton Darren |
Chief People Officer |
Tax↓
Filing footnotes — Common Stock (Direct)
Represents number of shares of AMTM common stock tendered for tax withholding upon vesting of restricted stock units. |
Common Stock
|
1,392 |
| 2025-12-05 | Burton Darren |
Chief People Officer |
Convert↑
Filing footnotes — Common Stock (Direct)
Represents distribution of AMTM common stock upon vesting of restricted stock units. |
Common Stock
|
2,721 |
| 2025-12-05 | Burton Darren |
Chief People Officer |
Convert↓
Filing footnotes — Restricted Stock Units (Direct)
Each restricted stock unit represents a contingent right to receive one share of AMTM common stock. Represents distribution of AMTM common stock upon vesting of restricted stock units. The restricted stock units awarded vested on December 5, 2025. |
Restricted Stock Units
|
2,721 |
| 2025-11-17 | DEMETRIOU STEVEN J. |
Director |
Convert↓
Filing footnotes — Restricted Stock Units (Direct)
Each restricted stock unit represents a contingent right to receive one share of AMTM common stock. Represents distribution of AMTM common stock upon vesting of restricted stock units. The restricted stock units awarded vested on November 17, 2025. |
Restricted Stock Units
|
43,396 |
| 2025-11-17 | Heller John E. |
Director, Chief Executive Officer |
Award↑
Filing footnotes — Common Stock (Direct)
One-third of the restricted stock units shall vest on each of the first, second and third anniversaries of November 17, 2025. |
Common Stock
|
155,897 |
| 2025-11-17 | Johnson Travis Barton |
Chief Financial Officer |
Award↑
Filing footnotes — Common Stock (Direct)
One-third of the restricted stock units shall vest on each of the first, second and third anniversaries of November 17, 2025. |
Common Stock
|
100,220 |