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Amentum Holdings, Inc. (AMTM) · Insider trading

What Amentum Holdings's directors, officers and largest holders bought and sold themselves, from the Form 4 each of them files with the SEC within two business days of a trade. Open-market purchases and sales first: those are the trades somebody chose to make at the market price.

Bought, 12 months
$0
0 insiders, 0 trades
Sold, 12 months
$0
0 insiders
Net, 12 months
$0
bought less sold
Latest filing
2026-09-17
filings read to 2026-10-19

Bought and sold at the market, by month

Two years. Purchases above the line, sales below, in dollars.

2025-01 2025-02: $2.18M bought 2025-07 2026-01 2026-07
Bought Sold Largest month: $2.18M

Who traded, two years

InsiderBoughtSold TradesLast tradeHolds after
Demetriou Steven J.Director, Executive Chair $2.08M – 1 2025-02-12 620,893
Loughran BarbaraDirector $97,658 – 1 2025-02-18 4,600

Open-market purchases and sales

Newest first. “Plan” marks a trade made under a 10b5-1 plan set up in advance.

DateInsiderTradeShares PriceValueHolds afterFiling
2025-02-18 Loughran BarbaraDirector Buy 4,600 21.23 $97,658 4,600 Form 4
2025-02-12 Demetriou Steven J.Director, Executive Chair Buy 100,000 20.81 $2.08M 620,893 Form 4

Grants, exercises and other transactions

Pay, tax and paperwork rather than a choice to trade at the market price. Two years.

33 × option exercise24 × shares withheld for tax16 × grant or award9 × other2 × gift
Show them
DateInsiderWhatShares PriceHolds afterFiling
2026-08-14 Thompson Christopher M.t.Director Gift G −4,250 – 5,750 Form 4
2026-05-06 Arnette Stephen AChief Operating Officer Option exercise M +13,609 – 109,966 Form 4
2026-05-06 Arnette Stephen AChief Operating Officer Shares withheld for tax F −3,314 24.89 106,652 Form 4
2026-05-06 Bruning Jill LChief Technology Officer Option exercise M +9,072 – 200,188 Form 4
2026-05-06 Bruning Jill LChief Technology Officer Shares withheld for tax F −2,731 24.89 197,457 Form 4
2026-05-06 Johnson Travis BartonChief Financial Officer Option exercise M +13,609 – 122,284 Form 4
2026-05-06 Johnson Travis BartonChief Financial Officer Shares withheld for tax F −4,097 24.89 118,187 Form 4
2026-05-06 Mullen Sean ThomasChief Growth Officer Option exercise M +9,072 – 35,210 Form 4
2026-05-06 Mullen Sean ThomasChief Growth Officer Shares withheld for tax F −2,762 24.89 32,448 Form 4
2026-05-06 Heller John E.Director, Chief Executive Officer Option exercise M +18,145 – 384,203 Form 4
2026-05-06 Heller John E.Director, Chief Executive Officer Shares withheld for tax F −8,184 24.89 376,019 Form 4
2026-03-04 Bruning Jill LChief Technology Officer Gift G −30,000 – 190,999 Form 4
2026-03-02 Arnette Stephen AChief Operating Officer Option exercise M +2,808 – 97,107 Form 4
2026-03-02 Arnette Stephen AChief Operating Officer Shares withheld for tax F −750 30.70 96,357 Form 4
2026-02-17 St. Mary Michele TChief Legal Officer & GC Option exercise M +7,080 – 29,351 Form 4
2026-02-17 St. Mary Michele TChief Legal Officer & GC Shares withheld for tax F −2,308 30.05 27,043 Form 4
2026-02-06 Vollmer John C.Director Option exercise M +11,564 – 424,780 Form 4
2026-02-06 Vollmer John C.Director Grant or award A +5,062 – 429,842 Form 4
2026-02-06 Thompson Christopher M.t.Director Grant or award A +5,062 – 5,062 Form 4
2026-02-06 Loughran BarbaraDirector Grant or award A +5,062 – 9,662 Form 4
2026-02-06 Eberhart Ralph eDirector Option exercise M +11,564 – 43,058 Form 4
2026-02-06 Eberhart Ralph eDirector Grant or award A +5,062 – 48,120 Form 4
2026-02-06 Brooks Vincent KDirector Option exercise M +11,564 – 22,400 Form 4
2026-02-06 Brooks Vincent KDirector Grant or award A +5,062 – 27,462 Form 4
2026-02-06 Rowland Sandra E.Director Option exercise M +11,564 – 15,011 Form 4
2026-02-06 Rowland Sandra E.Director Grant or award A +5,062 – 20,073 Form 4
2026-02-06 Ireland Susan LeslieDirector Grant or award A +5,062 – 8,509 Form 4
2026-01-28 Heller John E.Director, Chief Executive Officer Option exercise M +51,979 – 385,826 Form 4
2026-01-28 Heller John E.Director, Chief Executive Officer Shares withheld for tax F −19,768 35.71 366,058 Form 4
2025-12-17 Mullen Sean ThomasChief Growth Officer Option exercise M +9,298 – 30,332 Form 4
2025-12-17 Mullen Sean ThomasChief Growth Officer Shares withheld for tax F −4,194 28.67 26,138 Form 4
2025-12-05 Burton DarrenChief People Officer Option exercise M +2,721 – 24,992 Form 4
2025-12-05 Burton DarrenChief People Officer Shares withheld for tax F −1,392 28.88 23,600 Form 4
2025-11-17 Demetriou Steven J.Director, Executive Chair Option exercise M +43,396 – 726,198 Form 4
2025-11-17 Demetriou Steven J.Director, Executive Chair Shares withheld for tax F −17,077 21.49 709,121 Form 4
2025-11-17 Demetriou Steven J.Director, Executive Chair Grant or award A +111,355 – 820,476 Form 4
2025-11-17 Arnette Stephen AChief Operating Officer Option exercise M +1,178 – 47,243 Form 4
2025-11-17 Arnette Stephen AChief Operating Officer Shares withheld for tax F −287 21.49 46,956 Form 4
2025-11-17 Arnette Stephen AChief Operating Officer Grant or award A +46,769 – 93,725 Form 4
2025-11-17 St. Mary Michele TChief Legal Officer & GC Grant or award A +22,271 – 22,271 Form 4
2025-11-17 Johnson Travis BartonChief Financial Officer Grant or award A +100,220 – 108,675 Form 4
2025-11-17 Burton DarrenChief People Officer Grant or award A +22,271 – 22,271 Form 4
2025-11-17 Bruning Jill LChief Technology Officer Grant or award A +17,817 – 21,198 Form 4
2025-11-17 Heller John E.Director, Chief Executive Officer Grant or award A +155,897 – 269,440 Form 4
2025-11-17 Mullen Sean ThomasChief Growth Officer Grant or award A +17,817 – 21,034 Form 4
2025-11-16 Arnette Stephen AChief Operating Officer Option exercise M +5,053 – 41,036 Form 4
2025-11-16 Arnette Stephen AChief Operating Officer Shares withheld for tax F −1,231 22.07 39,805 Form 4
2025-11-16 Arnette Stephen AChief Operating Officer Option exercise M +3,681 – 43,486 Form 4
2025-11-16 Arnette Stephen AChief Operating Officer Shares withheld for tax F −897 22.07 42,589 Form 4
2025-11-16 Arnette Stephen AChief Operating Officer Option exercise M +4,596 – 47,185 Form 4
2025-11-16 Arnette Stephen AChief Operating Officer Shares withheld for tax F −1,120 22.07 46,065 Form 4
2025-11-15 Arnette Stephen AChief Operating Officer Option exercise M +5,758 – 37,386 Form 4
2025-11-15 Arnette Stephen AChief Operating Officer Shares withheld for tax F −1,403 22.07 35,983 Form 4
2025-11-06 Arnette Stephen AChief Operating Officer Option exercise M +12,701 – 34,721 Form 4
2025-11-06 Arnette Stephen AChief Operating Officer Shares withheld for tax F −3,093 21.79 31,628 Form 4
2025-11-06 Demetriou Steven J.Director, Executive Chair Option exercise M +90,727 – 711,620 Form 4
2025-11-06 Demetriou Steven J.Director, Executive Chair Shares withheld for tax F −28,818 21.79 682,802 Form 4
2025-11-06 Mullen Sean ThomasChief Growth Officer Option exercise M +4,838 – 4,838 Form 4
2025-11-06 Mullen Sean ThomasChief Growth Officer Shares withheld for tax F −1,621 21.79 3,217 Form 4
2025-11-06 Heller John E.Director, Chief Executive Officer Option exercise M +39,617 – 131,411 Form 4
2025-11-06 Heller John E.Director, Chief Executive Officer Shares withheld for tax F −17,868 21.79 113,543 Form 4
2025-11-06 Bruning Jill LChief Technology Officer Option exercise M +4,838 – 4,838 Form 4
2025-11-06 Bruning Jill LChief Technology Officer Shares withheld for tax F −1,457 21.79 3,381 Form 4
2025-11-06 Johnson Travis BartonChief Financial Officer Option exercise M +12,097 – 12,097 Form 4
2025-11-06 Johnson Travis BartonChief Financial Officer Shares withheld for tax F −3,642 21.79 8,455 Form 4
2025-05-08 Amentum Joint Venture LPDirector Other J −2,433,022 – 0 Form 4
2025-05-08 Lindsay Goldberg IV L.P.10% owner Other J +1,132,839 – 45,026,743 Form 4
2025-05-08 Goldberg Alan eDirector, 10% owner Other J +1,132,839 – 45,026,743 Form 4
2025-05-08 Lindsay Goldberg V L.P.10% owner Other J +1,132,839 – 45,026,743 Form 4
2025-04-07 Amentum Joint Venture LPDirector Grant or award A +2,433,022 – 2,433,022 Form 4
2025-03-13 Jacobs Solutions Inc.10% owner Other J −19,464,174 – 0 Form 4
2025-03-05 Eberhart Ralph eDirector Option exercise M +3,447 – 29,886 Form 4
2025-03-05 Rowland Sandra E.Director Option exercise M +3,447 – 3,447 Form 4
2025-03-05 Brooks Vincent KDirector Option exercise M +3,447 – 10,413 Form 4
2025-03-05 Vollmer John C.Director Option exercise M +3,447 – 394,788 Form 4
2025-03-05 Ireland Susan LeslieDirector Option exercise M +3,447 – 3,447 Form 4
2025-03-04 Arnette Stephen AChief Operating Officer Option exercise M +521 – 22,172 Form 4
2025-03-04 Arnette Stephen AChief Operating Officer Shares withheld for tax F −152 18.71 22,020 Form 4
2025-03-03 Arnette Stephen AChief Operating Officer Option exercise M +1,230 – 22,016 Form 4
2025-03-03 Arnette Stephen AChief Operating Officer Shares withheld for tax F −365 19.64 21,651 Form 4
2024-12-17 Vollmer John C.Director Other J +391,341 – 391,341 Form 4
2024-12-17 Heller John E.Director, Chief Executive Officer Other J +91,794 – 91,794 Form 4
2024-12-17 Goldberg Alan eDirector, 10% owner Other J +43,893,904 – 43,893,904 Form 4
2024-12-17 Amentum Joint Venture LPDirector, 10% owner Other J −90,021,804 – 0 Form 4

How to read it

Buy, sale
Code P and S on the form: shares bought or sold in the market, at the market price. The other codes are mostly pay (a grant, an option exercised) or tax (shares the company withheld), and say little about what the insider thinks of the price.
Plan
A sale or purchase under a Rule 10b5-1 plan, set up in advance and running on its own schedule. Since April 2023 the form has a box for it. Much executive selling is planned and says more about diversifying than about the company.
Holds after
The shares the insider still held after the trade, in the form the trade was in (directly, or indirectly through a trust or a fund).
Value
Shares times the price the form reports, which is often an average over several fills on the day.

Read from the SEC's own quarterly data sets of Forms 3, 4 and 5, and from each day's filings since the last one. A correcting amendment replaces the lines it restates. Every row links to its filing. None of this is advice: insiders sell for many reasons, and buy for fewer.

Amentum Holdings's scores and multiples ›