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Amentum Holdings AMTM

US equityMarket cap rank #2193Specialty Business Services
$18.24 +$0.10 (+0.55%)
Market closed · Oct 5, 11:50 pm ET · Last extended-hours $18.24 0.00%
Open$18.12
Prev close$18.14
Day range$18.02 – $18.63
Volume2.00M
Market cap$4.46B
P/E (TTM)21.9
Dividend yield–

Ownership & positioning

Who holds it, who is betting against it, and where the big money is moving

Institutional ownership106.3%+0.22 pts vs. prior quarter
Institutions holding544-1 vs. prior quarter
Insider trades (recent)34 buys / 16 sellsNet buying
Short interest5.00% of floatDays to cover 7.3 · as of 15 Sep 2026
Short-sale volume share21.6%5-day average of daily volume

Short-sale volume as % of daily volume

10%18%26%33%Sep '26Sep '26Oct '26

Large-order net flow, last 20 sessions

Net of large-order buying minus selling, in USD. Over this window: −$14.51M (4 inflow days, 16 outflow days).

The five largest holders on file together own 57.9% of shares outstanding.

Largest holders

  • American Securities LLC18.42%
  • Lindsay Goldberg LLC18.42%
  • Invesco Ltd.8.75%
  • BlackRock7.32%
  • PRIMECAP Management Company5.02%
  • Vanguard Portfolio Management, LLC3.25%
  • Vanguard Capital Management, LLC3.14%
  • FMR2.30%

By investor type

  • Mutual Fund57.19%
  • VC/PE Fund37.77%
  • Hedge Fund5.26%
  • Public Company2.88%
  • Private Company1.04%
  • Government Pension Fund0.89%
  • Individual/Insider0.74%
  • Sovereign Wealth Fund0.63%

Reported short interest has fallen from 5.62% to 5.00% of float over the last 6 biweekly reports (30 Jun 2026 to 15 Sep 2026).

Short interest, by report

Report dateShares short% of floatDays to cover
15 Sep 2026 12,229,137 5.0% 7.3
31 Aug 2026 12,095,846 4.9% 4.8
14 Aug 2026 10,651,434 4.4% 4.2
31 Jul 2026 12,385,682 5.1% 7.1
15 Jul 2026 13,453,698 5.5% 7.0
30 Jun 2026 13,742,445 5.6% 6.1

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