AMTM
Amentum Holdings, Inc.
NYSE · Industrials · Aerospace & Defense · US
$20.07
−0.20%0
Insider buys (3m)
0
Insider sells (3m)
$0.00
Net value (3m)
-11.4%
Price return (3m)
Form 4 filings
| Date | Insider | Activity | Shares | Price |
|---|---|---|---|---|
| May 7, 2026 | Mullen Sean Thomas · officer: Chief Growth Officer | F-InKind | 2,762 | $25 |
| May 7, 2026 | Johnson Travis Barton · officer: Chief Financial Officer | F-InKind | 4,097 | $25 |
| May 7, 2026 | Bruning Jill L · officer: Chief Technology Officer | M-Exempt | 9,072 | $0.00 |
| May 7, 2026 | Bruning Jill L · officer: Chief Technology Officer | F-InKind | 2,731 | $25 |
| May 7, 2026 | Arnette Stephen A · officer: Chief Operating Officer | M-Exempt | 13,609 | $0.00 |
| May 7, 2026 | Mullen Sean Thomas · officer: Chief Growth Officer | M-Exempt | 9,072 | $0.00 |
| May 7, 2026 | Heller John E. · director, officer: Chief Executive Officer | F-InKind | 8,184 | $25 |
| May 7, 2026 | Heller John E. · director, officer: Chief Executive Officer | M-Exempt | 18,145 | $0.00 |
| May 7, 2026 | Johnson Travis Barton · officer: Chief Financial Officer | M-Exempt | 13,609 | $0.00 |
| May 7, 2026 | Arnette Stephen A · officer: Chief Operating Officer | F-InKind | 3,314 | $25 |
| Mar 4, 2026 | Arnette Stephen A · officer: Chief Operating Officer | F-InKind | 750 | $31 |
| Mar 4, 2026 | Arnette Stephen A · officer: Chief Operating Officer | M-Exempt | 2,808 | $0.00 |
| Feb 18, 2026 | St. Mary Michele T · officer: Chief Legal Officer & GC | F-InKind | 2,308 | $30 |
| Feb 18, 2026 | St. Mary Michele T · officer: Chief Legal Officer & GC | M-Exempt | 7,080 | $0.00 |
| Feb 10, 2026 | Vollmer John C. · director | M-Exempt | 11,564 | $0.00 |
| Feb 10, 2026 | Brooks Vincent K · director | A-Award | 5,062 | $0.00 |
| Feb 10, 2026 | Brooks Vincent K · director | M-Exempt | 11,564 | $0.00 |
| Feb 10, 2026 | EBERHART RALPH E · director | A-Award | 5,062 | $0.00 |
| Feb 10, 2026 | EBERHART RALPH E · director | M-Exempt | 11,564 | $0.00 |
| Feb 10, 2026 | Loughran Barbara · director | A-Award | 5,062 | $0.00 |
| Feb 10, 2026 | Thompson Christopher M.T. · director | A-Award | 5,062 | $0.00 |
| Feb 10, 2026 | Vollmer John C. · director | A-Award | 5,062 | $0.00 |
| Feb 10, 2026 | IRELAND SUSAN LESLIE · director | A-Award | 5,062 | $0.00 |
| Feb 10, 2026 | Rowland Sandra E. · director | A-Award | 5,062 | $0.00 |
| Feb 10, 2026 | Rowland Sandra E. · director | M-Exempt | 11,564 | $0.00 |
| Jan 29, 2026 | Heller John E. · director, officer: Chief Executive Officer | M-Exempt | 51,979 | $0.00 |
| Jan 29, 2026 | Heller John E. · director, officer: Chief Executive Officer | F-InKind | 19,768 | $36 |
| Dec 19, 2025 | Mullen Sean Thomas · officer: Chief Growth Officer | F-InKind | 4,194 | $29 |
| Dec 19, 2025 | Mullen Sean Thomas · officer: Chief Growth Officer | M-Exempt | 9,298 | $0.00 |
| Dec 9, 2025 | Burton Darren · officer: Chief People Officer | M-Exempt | 2,721 | $0.00 |
Institutional positioning
13F filings over the trailing two quarters
New 131Increased 294Reduced 322Sold out 75
| Filer | Action | Shares | Filed |
|---|---|---|---|
| AMERICAN SECURITIES LLC | Unchanged | 45,026,743 | Aug 26, 2026 |
| AMERICAN SECURITIES LLC | Unchanged | 45,026,743 | May 14, 2026 |
| Invesco Ltd. | Increased | 24,954,251 | Aug 14, 2026 |
| INVESCO LTD. | Reduced | 21,473,778 | May 12, 2026 |
| BlackRock, Inc. | Increased | 17,906,984 | Aug 7, 2026 |
| BLACKROCK, INC. | Increased | 17,841,283 | May 13, 2026 |
| PRIMECAP MANAGEMENT CO/CA/ | Increased | 12,285,504 | Aug 14, 2026 |
| PRIMECAP MANAGEMENT CO/CA/ | Reduced | 12,085,294 | May 11, 2026 |
| Legacy Advisors, LLC | Increased | 9,065,677 | Jul 24, 2026 |
| LEGACY ADVISORS, LLC | Reduced | 9,064,278 | May 5, 2026 |
| VANGUARD PORTFOLIO MANAGEMENT LLC | Increased | 7,948,385 | Aug 13, 2026 |
| VANGUARD PORTFOLIO MANAGEMENT LLC | New Position | 7,852,951 | May 8, 2026 |
| VANGUARD CAPITAL MANAGEMENT LLC | Increased | 6,711,987 | Aug 13, 2026 |
| VANGUARD CAPITAL MANAGEMENT LLC | New Position | 6,650,879 | May 15, 2026 |
| FMR LLC | Increased | 5,679,175 | Aug 13, 2026 |
Insider activity from SEC Form 4; institutional positioning from 13F filings · Latest filing May 7, 2026