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Amentum Holdings, Inc.

AMTM
Exchange
NYSE
Industry
Services-Business Services, NEC
SEC CIK
0002011286

No open-market purchases or sales by Amentum Holdings, Inc. insiders were filed in the last 90 days; 464 institutions reported holding it in 13F filings for Q2 2026, worth $4.35B in total; Soros Fund Management is the only superinvestor holding it.

Open-market trades, last 90 days

Open-market purchases (P) and sales (S) by Amentum Holdings, Inc. insiders, counted by Form 4 filing. Trades with a flagged price and duplicate filings are left out.

Open-market buys
0 filings
Open-market sells
0 filings
Insiders trading
0
Net value
$0
Purchases minus sales

Insider roster

Directors, officers and 10% owners who have filed a Form 4 for Amentum Holdings, Inc., current and former, most recent filer first. Last reported holding is the position after the last non-derivative trade in their latest filing.

Insider roster for Amentum Holdings, Inc.
NameTitleLast reported holdingLast filingFilings, past year
Thompson Christopher M.T.Director5,750IndirectSep 17, 20262
Heller John E.Chief Executive Officer376,019May 7, 20264
Johnson Travis BartonChief Financial Officer118,187May 7, 20263
Arnette Stephen AChief Operating Officer106,652May 7, 20265
Mullen Sean ThomasChief Growth Officer32,448May 7, 20264
Bruning Jill LChief Technology Officer197,457May 7, 20264
St. Mary Michele TChief Legal Officer & GC27,043Feb 18, 20262
Demetriou Steven J.Executive Chair820,476Feb 10, 20262
Eberhart Ralph EDirector48,120Feb 10, 20261
Rowland Sandra E.Director20,073Feb 10, 20261
Ireland Susan LeslieDirector8,509Feb 10, 20261
Vollmer John C.Director429,842Feb 10, 20261
Loughran BarbaraDirector9,662Feb 10, 20261
Brooks Vincent KDirector27,462Feb 10, 20261
Burton DarrenChief People Officer23,600Dec 9, 20252
Lindsay Goldberg V L.P.10% Owner45,026,743IndirectMay 12, 20250
Lindsay Goldberg Employee Co-Inv. IV L.P.10% Owner45,026,743IndirectMay 12, 20250
LG Co-Inv. A L.P.10% Owner45,026,743IndirectMay 12, 20250
Lindsay Goldberg Maverick Co-Inv. L.P.10% Owner45,026,743IndirectMay 12, 20250
LG Amentum Holdings GP LLC10% Owner45,026,743IndirectMay 12, 20250
LG Amentum Holdings LP10% Owner45,026,743IndirectMay 12, 20250
Lindsay Goldberg IV L.P.10% Owner45,026,743IndirectMay 12, 20250
Lindsay Goldberg IV - A L.P.10% Owner45,026,743IndirectMay 12, 20250
Lindsay Goldberg IV - PCF L.P.10% Owner45,026,743IndirectMay 12, 20250
Lindsay Goldberg GP IV LLC10% Owner45,026,743IndirectMay 12, 20250
Goldberg 2020 LLC10% Owner45,026,743IndirectMay 12, 20250
LG GP Holding V LLC10% Owner45,026,743IndirectMay 12, 20250
Lindsay Goldberg Co-Inv. IV L.P.10% Owner45,026,743IndirectMay 12, 20250
Lindsay Goldberg GP V LLC10% Owner45,026,743IndirectMay 12, 20250
Goldberg 2014 LLC10% Owner45,026,743IndirectMay 12, 20250
LG GP Holding IV LLC10% Owner45,026,743IndirectMay 12, 20250
Amentum Joint Venture LPDirector0IndirectMay 12, 20250
Amentum Joint Venture GP LLCDirector0IndirectMay 12, 20250
Goldberg Alan EDirector, 10% Owner45,026,743IndirectMay 12, 20250
Jacobs Solutions Inc.10% Owner0IndirectMar 17, 20250
Jacobs Engineering Group Inc10% Owner0IndirectMar 17, 20250
Young Stuart IraChief Legal Officer–Nov 8, 20240

Insider trades

Each row adds up one type of transaction in one Form 4 filing. Only open-market purchases (P) and sales (S) are shown by default; use the filters to see grants, option exercises and other codes.

Insider trades
Filed (ET)Trade dateFiling delayInsiderTransactionSharesAvg priceValueHolding changeFlags
Feb 20, 2025 (view filing)Feb 182 daysLoughran BarbaraDirectorPPurchase+4.60K$21.23+$97.7KNew position4.60K after
Feb 14, 2025 (view filing)Feb 122 daysDemetriou Steven J.Executive ChairPPurchase+100.0K$20.81+$2.08M+19.2%620.9K after