Amentum Holdings, Inc. (AMTM)
$20.24-$0.12 (-0.59%) Today
Amentum Holdings Inc is an engineering and technology solutions provider serving U.S. and allied government agencies, as well as international and commercial customers across energy and environmental, intelligence, space, defense, civilian and commercial markets. It provides environmental remediation, intelligence and counter-threat solutions, data analytics, engineering and integration, testing, training and citizen services. The company operates through two segments: Digital Solutions, offering digital and data-driven services, and Global Engineering Solutions, providing environmental remediation, nuclear power solutions, platform engineering, sustainment, and supply chain management. majority of its revenue comes from the Global Engineering Solutions segment and from the United States.
No Form 4 activity for AMTM in the last 90 days.
53 Form 4 filings on record, the earliest from Oct 4, 2024, newest first. Filing history page 1 of 2.
| Date | Insider | Transaction | Security | Shares | Price | Value |
|---|---|---|---|---|---|---|
| John E. Heller - Officer | Option exercise | Common Stock | 18,145 | - | - | |
| John E. Heller - Officer | Tax withholding / forfeiture | Common Stock | 8,184 | $24.89 | $204K | |
| John E. Heller - Officer | Option exercise | Restricted Stock Units | 18,145 | $0.00 | - | |
| Sean Thomas Mullen - Officer | Option exercise | Common Stock | 9,072 | - | - | |
| Sean Thomas Mullen - Officer | Tax withholding / forfeiture | Common Stock | 2,762 | $24.89 | $69K | |
| Sean Thomas Mullen - Officer | Option exercise | Restricted Stock Units | 9,072 | $0.00 | - | |
| Travis Barton Johnson - Officer | Option exercise | Common Stock | 13,609 | - | - | |
| Travis Barton Johnson - Officer | Option exercise | Restricted Stock Units | 13,609 | $0.00 | - | |
| Travis Barton Johnson - Officer | Tax withholding / forfeiture | Common Stock | 4,097 | $24.89 | $102K | |
| Jill L. Bruning - Officer | Option exercise | Common Stock | 9,072 | - | - | |
| Jill L. Bruning - Officer | Tax withholding / forfeiture | Common Stock | 2,731 | $24.89 | $68K | |
| Jill L. Bruning - Officer | Option exercise | Restricted Stock Units | 9,072 | $0.00 | - | |
| Stephen A. Arnette - Officer | Option exercise | Common Stock | 13,609 | - | - | |
| Stephen A. Arnette - Officer | Tax withholding / forfeiture | Common Stock | 3,314 | $24.89 | $82K | |
| Stephen A. Arnette - Officer | Option exercise | Restricted Stock Units | 13,609 | $0.00 | - | |
| Jill L. Bruning - Officer | Gift | Common Stock | 30,000 | $0.00 | - | |
| Stephen A. Arnette - Officer | Option exercise | Restricted Stock Units | 2,808 | $0.00 | - | |
| Stephen A. Arnette - Officer | Option exercise | Common Stock | 2,808 | - | - | |
| Stephen A. Arnette - Officer | Tax withholding / forfeiture | Common Stock | 750 | $30.70 | $23K | |
| Mary Michele T. St. - Officer | Option exercise | Common Stock | 7,080 | - | - | |
| Mary Michele T. St. - Officer | Tax withholding / forfeiture | Common Stock | 2,308 | $30.05 | $69K | |
| Mary Michele T. St. - Officer | Option exercise | Restricted Stock Units | 7,080 | $0.00 | - | |
| Susan Leslie Ireland - Director | Grant or award | Common Stock | 5,062 | $0.00 | - | |
| Sandra E. Rowland - Director | Option exercise | Common Stock | 11,564 | - | - | |
| Sandra E. Rowland - Director | Grant or award | Common Stock | 5,062 | $0.00 | - | |
| Sandra E. Rowland - Director | Option exercise | Restricted Stock Units | 11,564 | $0.00 | - | |
| Vincent K. Brooks - Director | Option exercise | Common Stock | 11,564 | - | - | |
| Vincent K. Brooks - Director | Grant or award | Common Stock | 5,062 | $0.00 | - | |
| Vincent K. Brooks - Director | Option exercise | Restricted Stock Units | 11,564 | $0.00 | - | |
 Ralph E. Eberhart - Director | Option exercise | Common Stock | 11,564 | - | - | |
| Ralph E. Eberhart - Director | Grant or award | Common Stock | 5,062 | $0.00 | - | |
| Ralph E. Eberhart - Director | Option exercise | Restricted Stock Units | 11,564 | $0.00 | - | |
| Barbara Loughran - Director | Grant or award | Common Stock | 5,062 | $0.00 | - | |
| Christopher M.T. Thompson - Director | Grant or award | Common Stock | 5,062 | $0.00 | - | |
| John C. Vollmer - Director | Option exercise | Common Stock | 11,564 | - | - | |
| John C. Vollmer - Director | Grant or award | Common Stock | 5,062 | $0.00 | - | |
| John C. Vollmer - Director | Option exercise | Restricted Stock Units | 11,564 | $0.00 | - | |
| John E. Heller - Officer | Option exercise | Common Stock | 51,979 | - | - | |
| John E. Heller - Officer | Tax withholding / forfeiture | Common Stock | 19,768 | $35.71 | $706K | |
| John E. Heller - Officer | Option exercise | Restricted Stock Units | 51,979 | $0.00 | - | |
| Jill L. Bruning - Officer | Grant or award | Common Stock | 17,817 | $0.00 | - | |
 Steven J. Demetriou - Officer | Option exercise | Restricted Stock Units | 43,396 | $0.00 | - | |
| Steven J. Demetriou - Officer | Option exercise | Common Stock | 43,396 | - | - | |
| Steven J. Demetriou - Officer | Tax withholding / forfeiture | Common Stock | 17,077 | $21.49 | $367K | |
| Steven J. Demetriou - Officer | Grant or award | Common Stock | 111,355 | $0.00 | - | |
| John E. Heller - Officer | Grant or award | Common Stock | 155,897 | $0.00 | - | |
| Travis Barton Johnson - Officer | Grant or award | Common Stock | 100,220 | $0.00 | - | |
| Stephen A. Arnette - Officer | Option exercise | Restricted Stock Units | 1,178 | $0.00 | - | |
| Stephen A. Arnette - Officer | Option exercise | Common Stock | 1,178 | - | - | |
| Stephen A. Arnette - Officer | Tax withholding / forfeiture | Common Stock | 287 | $21.49 | $6K | |
| Stephen A. Arnette - Officer | Grant or award | Common Stock | 46,769 | $0.00 | - | |
| Mary Michele T. St. - Officer | Grant or award | Common Stock | 22,271 | $0.00 | - | |
| Darren Burton - Officer | Grant or award | Common Stock | 22,271 | $0.00 | - | |
| Sean Thomas Mullen - Officer | Grant or award | Common Stock | 17,817 | $0.00 | - | |
| Stephen A. Arnette - Officer | Tax withholding / forfeiture | Common Stock | 1,403 | $22.07 | $31K | |
| Stephen A. Arnette - Officer | Option exercise | Common Stock | 5,053 | - | - | |
| Stephen A. Arnette - Officer | Tax withholding / forfeiture | Common Stock | 1,231 | $22.07 | $27K | |
| Stephen A. Arnette - Officer | Option exercise | Common Stock | 3,681 | - | - | |
| Stephen A. Arnette - Officer | Tax withholding / forfeiture | Common Stock | 897 | $22.07 | $20K | |
| Stephen A. Arnette - Officer | Option exercise | Common Stock | 4,596 | - | - | |
| Stephen A. Arnette - Officer | Tax withholding / forfeiture | Common Stock | 1,120 | $22.07 | $25K | |
| Stephen A. Arnette - Officer | Option exercise | Restricted Stock Units | 5,758 | $0.00 | - | |
| Stephen A. Arnette - Officer | Option exercise | Restricted Stock Units | 5,053 | $0.00 | - | |
| Stephen A. Arnette - Officer | Option exercise | Restricted Stock Units | 3,681 | $0.00 | - | |
| Stephen A. Arnette - Officer | Option exercise | Restricted Stock Units | 4,596 | $0.00 | - | |
| Stephen A. Arnette - Officer | Option exercise | Common Stock | 5,758 | - | - | |
| Jill L. Bruning - Officer | Option exercise | Restricted Stock Units | 4,838 | $0.00 | - | |
| Jill L. Bruning - Officer | Option exercise | Common Stock | 4,838 | - | - | |
| Jill L. Bruning - Officer | Tax withholding / forfeiture | Common Stock | 1,457 | $21.79 | $32K | |
| Steven J. Demetriou - Officer | Tax withholding / forfeiture | Common Stock | 28,818 | $21.79 | $628K | |
| Steven J. Demetriou - Officer | Option exercise | Restricted Stock Units | 90,727 | $0.00 | - | |
| Steven J. Demetriou - Officer | Option exercise | Common Stock | 90,727 | - | - | |
| John E. Heller - Officer | Option exercise | Restricted Stock Units | 39,617 | $0.00 | - | |
| John E. Heller - Officer | Option exercise | Common Stock | 39,617 | - | - | |
| John E. Heller - Officer | Tax withholding / forfeiture | Common Stock | 17,868 | $21.79 | $389K | |
| Travis Barton Johnson - Officer | Option exercise | Common Stock | 12,097 | - | - | |
| Travis Barton Johnson - Officer | Tax withholding / forfeiture | Common Stock | 3,642 | $21.79 | $79K | |
| Travis Barton Johnson - Officer | Option exercise | Restricted Stock Units | 12,097 | $0.00 | - |
Amentum Holdings, Inc. (AMTM) has filed no insider reports in the last 90 days. The most recent on record is dated 2026-05-07. The full record for AMTM runs to 53 Form 4 filings, the earliest from 2024-10-04. InsiderAlpha tracks every Form 4, Form 144, and 8-K filing in real time.
No insider purchases of AMTM were filed in the last 90 days.
No insider sales of AMTM were filed in the last 90 days.
This page tracks AMTM Form 4 insider transactions, Form 144 sale notices, and 8-K material event disclosures in one timeline. Annual 10-K and quarterly 10-Q reports live on the company's SEC EDGAR page.
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Every Form 4 below links to the original document on SEC EDGAR, so the numbers on this page can be checked against the filing they came from.
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