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Century Aluminum CENX

US equityMarket cap rank #2339Aluminum
$36.94 +$1.32 (+3.71%)
Pre-market · Oct 6, 4:10 am ET · After hours $36.94 0.00%
Open$35.71
Prev close$35.62
Day range$35.66 – $37.45
Volume1.86M
Market cap$3.66B
P/E (TTM)6.4
Dividend yield–

Ownership & positioning

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

Institutional ownership107.4%+0.09 pts vs. prior quarter
Institutions holding489+0 vs. prior quarter
Insider trades (recent)22 buys / 28 sellsNet selling
Short interest9.80% of floatDays to cover 6.3 · as of 15 Sep 2026
Short-sale volume share19.8%5-day average of daily volume

Short-sale volume as % of daily volume

12%18%23%29%Sep '26Sep '26Oct '26

Large-order net flow, last 20 sessions

Net of large-order buying minus selling, in USD. Over this window: −$10.67M (5 inflow days, 15 outflow days).

The five largest holders on file together own 54.3% of shares outstanding.

Largest holders

  • Glencore plc29.99%
  • BlackRock10.41%
  • State Street Global Advisors5.60%
  • Vanguard Portfolio Management, LLC4.82%
  • Vanguard Capital Management, LLC3.43%
  • Sourcerock Group LLC2.29%
  • Dimensional Fund Advisors2.23%
  • FMR1.97%

By investor type

  • Mutual Fund55.15%
  • Public Company33.83%
  • Hedge Fund14.04%
  • Government Pension Fund1.74%
  • VC/PE Fund0.87%
  • Private Company0.86%
  • Individual/Insider0.67%
  • Family Office/Trust0.66%

Reported short interest has risen from 9.63% to 9.80% 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 9,701,397 9.8% 6.3
31 Aug 2026 10,183,769 10.3% 5.2
14 Aug 2026 9,181,113 9.3% 3.9
31 Jul 2026 9,917,565 10.0% 5.7
15 Jul 2026 9,776,994 9.9% 5.1
30 Jun 2026 9,533,604 9.6% 3.1

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