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Constellium CSTM

US equityMarket cap rank #2389
$25.29 +$0.89 (+3.65%)
Market closed · Oct 5, 10:20 pm ET · Last extended-hours $25.75 +1.82%
Open$24.42
Prev close$24.40
Day range$24.38 – $25.73
Volume1.84M
Market cap$3.43B
P/E (TTM)6.5
Dividend yield–

Ownership & positioning

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

Institutional ownership92.2%-0.15 pts vs. prior quarter
Institutions holding456-3 vs. prior quarter
Insider trades (recent)25 buys / 25 sellsBalanced
Short interest5.25% of floatDays to cover 5.5 · as of 15 Sep 2026
Short-sale volume share17.6%5-day average of daily volume

Short-sale volume as % of daily volume

7%14%22%29%Sep '26Sep '26Oct '26

Large-order net flow, last 20 sessions

Net of large-order buying minus selling, in USD. Over this window: −$17.96M (9 inflow days, 11 outflow days).

The five largest holders on file together own 26.3% of shares outstanding.

Largest holders

  • BlackRock9.45%
  • Bpifrance Participations SA6.20%
  • Morgan Stanley4.31%
  • Vanguard Portfolio Management, LLC3.24%
  • American Century Investment Management3.11%
  • T. Rowe Price Group, Inc.2.28%
  • State Street Global Advisors2.18%
  • Arrowstreet Capital, Limited Partnership2.10%

By investor type

  • Mutual Fund53.36%
  • Hedge Fund17.59%
  • VC/PE Fund8.08%
  • Public Company6.71%
  • Individual/Insider2.73%
  • Government Pension Fund2.62%
  • Private Company2.04%
  • Insurance Company1.14%

Reported short interest has risen from 4.21% to 5.25% 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 7,108,976 5.2% 5.5
31 Aug 2026 6,933,768 5.1% 4.4
14 Aug 2026 6,721,503 5.0% 5.1
31 Jul 2026 6,157,002 4.5% 3.3
15 Jul 2026 6,534,145 4.8% 4.1
30 Jun 2026 5,735,932 4.2% 2.7

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