Amentum Holdings, Inc.
A global contractor providing engineering, technology, and mission-critical services to the U.S. government, allied nations, and commercial clients, Amentum handles everything from nuclear cleanup at the Hanford and Savannah River sites to space systems and cybersecurity. It was born in 2020 when AECOM sold its management services business, and in 2024 it merged with Jacobs' critical mission and cyber units. Its name is the Latin word for the leather strap javelin throwers used to add spin and range.
Granted 154.8K · Bought 100.0K
Granted 20.1K
Granted 109.7K
Granted 13.9K
Granted 125.9K
Granted 50.0K
Granted 20.1K
Granted 41.0K
Granted 5.1K
Granted 29.4K
Granted 25.0K
Granted 20.1K
Granted 20.1K
Granted 5.1K · Bought 4.6K
Granted 8.5K
Granted 2.43M
| Insider | Stake change | Holds now | Granted / vested | Bought | Sold |
|---|---|---|---|---|---|
| LG Amentum Holdings GP LLC +5 co-filers10% owner · 1 transaction | — | 88.92Mas of May 2025 | — | — | — |
| Goldberg Alan EDirector, 10% owner · 2 transactions | — | 45.03Mas of May 2025 | — | — | — |
| Goldberg 2014 LLC +9 co-filers10% owner · 1 transaction | — | 45.03Mas of May 2025 | — | — | — |
| Jacobs Engineering Group Inc /De/ +1 co-filer10% owner · 2 transactions | — | 29.20Mas of Mar 2025 | — | — | — |
| Demetriou Steven J.Executive Chair, Director · 5 transactions | — | 1.59M | 154.8K | 100.0K | — |
| Vollmer John C.Director · 4 transactions | — | 424.8K | 20.1K | — | — |
| Heller John E.Chief Executive Officer, Director · 7 transactions | — | 376.0K | 109.7K | — | — |
| Bruning Jill LChief Technology Officer · 5 transactions | — | 197.5K | 13.9K | — | — |
| Johnson Travis BartonChief Financial Officer · 5 transactions | — | 122.3K | 125.9K | — | — |
| Arnette Stephen AChief Operating Officer · 19 transactions | — | 106.7K | 50.0K | — | — |
| Eberhart Ralph EDirector · 4 transactions | — | 43.1K | 20.1K | — | — |
| Mullen Sean ThomasChief Growth Officer · 7 transactions | — | 35.2K | 41.0K | — | — |
| Thompson Christopher M.T.Director · 1 transaction | — | 29.1K | 5.1K | — | — |
| St. Mary Michele TChief Legal Officer & GC · 3 transactions | — | 27.0K | 29.4K | — | — |
| Burton DarrenChief People Officer · 3 transactions | — | 23.6K | 25.0K | — | — |
| Brooks Vincent KDirector · 4 transactions | — | 22.4K | 20.1K | — | — |
| Rowland Sandra E.Director · 3 transactions | — | 20.1K | 20.1K | — | — |
| Loughran BarbaraDirector · 2 transactions | — | 9.7K | 5.1K | 4.6K | — |
| Ireland Susan LeslieDirector · 2 transactions | — | 8.5K | 8.5K | — | — |
| Amentum Joint Venture GP LLC +1 co-filerDirector · 3 transactions | — | 0as of May 2025 | 2.43M | — | — |
Select a row to see that insider’s individual transactions. Sum of the holdings confirmed in the 12 months before this insider's last filing. A Form 4 reports a holding per line — held directly, or through a named trust, partnership or foundation, and in each share class separately — never a person’s total. Lines not restated in that time are left out and shown apart: an active filer restates what they still hold, so a line they did not restate is more often an entity since renamed, whose shares a successor line reports too. An amber marker means some were left out.
Net open-market activity over the last 3 years: +104.6K shares. Grants, option exercises and tax withholding are excluded — they are compensation mechanics, not decisions to buy or sell.