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Celldex Therapeutics CLDX

US equityMarket cap rank #2602Biotechnology
$32.59 +$0.94 (+2.97%)
Market closed · Oct 6, 4:20 am ET · Last extended-hours $32.59 0.00%
Open$31.83
Prev close$31.65
Day range$31.50 – $32.88
Volume1.26M
Market cap$2.56B
P/E (TTM)–
Dividend yield–

Ownership & positioning

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

Institutional ownership110.8%+0.37 pts vs. prior quarter
Institutions holding303-1 vs. prior quarter
Insider trades (recent)44 buys / 6 sellsNet buying
Short interest11.40% of floatDays to cover 13.1 · as of 15 Sep 2026
Short-sale volume share18.4%5-day average of daily volume

Short-sale volume as % of daily volume

9%16%23%30%Sep '26Sep '26Oct '26

Large-order net flow, last 20 sessions

Net of large-order buying minus selling, in USD. Over this window: +$5.40M (10 inflow days, 10 outflow days).

The five largest holders on file together own 38.9% of shares outstanding.

Largest holders

  • Wellington Management Group12.15%
  • BlackRock8.92%
  • Kynam Capital Management, LP6.78%
  • T. Rowe Price Group, Inc.5.97%
  • Vanguard Capital Management, LLC5.12%
  • State Street Global Advisors4.97%
  • FMR4.74%
  • Deep Track Capital, LP3.74%

By investor type

  • Mutual Fund70.69%
  • Hedge Fund27.93%
  • VC/PE Fund7.52%
  • Public Company2.84%
  • Insurance Company0.86%
  • Private Company0.58%
  • Government Pension Fund0.39%
  • Individual/Insider0.24%

Reported short interest has risen from 9.86% to 11.40% 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 8,953,127 11.4% 13.1
31 Aug 2026 8,641,597 11.0% 12.2
14 Aug 2026 7,569,702 9.6% 7.9
31 Jul 2026 7,627,081 9.7% 7.6
15 Jul 2026 7,663,191 9.8% 9.1
30 Jun 2026 7,738,673 9.9% 4.3

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