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Who owns Amentum Holdings (AMTM) stock

435 funds reported Amentum Holdings (AMTM) shares in their latest 13F filings, worth $4.6B in all. The largest holder is American Securities LLC ($931M). Last quarter 189 funds added to their stakes and 196 cut them.

Largest holders of AMTM (13F)Largest holders of AMTM (13F)American Securities LLC$931MInvesco$516MVanguard Group$447MBlackRock$370MPrimecap Management$254MVanguard Portfolio Management LLC$164MVanguard Capital Management LLC$139MFMR LLC$117MDimensional Fund Advisors LP$114MState Street$106M

Largest holders (13F)

FundSharesValueChangeQuarter
American Securities LLC45,026,743$931Munchanged2026-06-30
Invesco24,954,251$516Mincrease2026-06-30
Vanguard Group15,411,745$447Mdecrease2025-12-31
BlackRock17,906,984$370Mincrease2026-06-30
Primecap Management12,285,504$254Mincrease2026-06-30
Vanguard Portfolio Management LLC7,948,385$164Mincrease2026-06-30
Vanguard Capital Management LLC6,711,987$139Mincrease2026-06-30
FMR LLC5,679,175$117Mincrease2026-06-30
Dimensional Fund Advisors LP5,537,696$114Mincrease2026-06-30
State Street5,151,772$106Mincrease2026-06-30
Frontier Capital Management Co LLC4,143,971$85.7Mdecrease2026-06-30
Troluce Capital Advisors LLC3,565,399$73.7Mincrease2026-06-30
Geode Capital Management, LLC2,716,560$56.2Mdecrease2026-06-30
Goldman Sachs Group2,711,866$56.1Mincrease2026-06-30
Morgan Stanley2,662,329$55.0Mincrease2026-06-30

Amentum Holdings' latest quarter

Amentum Holdings, Q3 FY26: revenue $3.5B (-2% year over year), operating margin 4.9%, net earnings $66.0M, operating cash flow $146M. The chart follows the revenue to costs, profit and cash.

Questions

Who owns the most AMTM stock?

By the latest 13F filings: American Securities LLC ($931M); Invesco ($516M); Vanguard Group ($447M); BlackRock ($370M); Primecap Management ($254M).

What is the short interest in AMTM?

12,665,271 shares were sold short at the 2026-10-15 settlement, 2.72% of the float.

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Updated Nov 8, 2026. Read automatically from SEC filings and public data; errors are possible. Not investment advice.