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Zenas BioPharma ZBIO

US equityMarket cap rank #2853
$27.83 −$0.47 (-1.64%)
Pre-market · Oct 6, 5:40 am ET · After hours $27.83 0.00%
Open$28.47
Prev close$28.30
Day range$27.77 – $29.06
Volume1.13M
Market cap$1.81B
P/E (TTM)–
Dividend yield–

Ownership & positioning

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

Institutional ownership123.9%+6.52 pts vs. prior quarter
Institutions holding184+1 vs. prior quarter
Insider trades (recent)49 buys / 0 sellsNet buying
Short interest18.21% of floatDays to cover 22.4 · as of 15 Sep 2026
Short-sale volume share21.0%5-day average of daily volume

Short-sale volume as % of daily volume

6%16%27%37%Sep '26Sep '26Oct '26

Large-order net flow, last 20 sessions

Net of large-order buying minus selling, in USD. Over this window: +$2.51M (12 inflow days, 8 outflow days).

The five largest holders on file together own 49.3% of shares outstanding.

Largest holders

  • FMR14.59%
  • InnoCare Pharma Limited10.74%
  • Wellington Management Group10.07%
  • SR One Capital Management, LP7.73%
  • New Enterprise Associates, Inc.6.17%
  • Zebra Aggregator, LP4.98%
  • Federated Hermes, Inc.4.78%
  • Xencor, Inc.4.75%

By investor type

  • Mutual Fund62.53%
  • VC/PE Fund24.22%
  • Public Company18.22%
  • Hedge Fund14.71%
  • Private Company4.02%
  • Individual/Insider1.52%
  • Government Pension Fund0.13%
  • Insurance Company0.03%

Reported short interest has fallen from 19.32% to 18.21% 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 11,871,346 18.2% 22.4
31 Aug 2026 11,702,288 18.0% 14.2
14 Aug 2026 11,658,986 17.9% 21.1
31 Jul 2026 11,753,566 18.6% 13.8
15 Jul 2026 12,169,907 19.3% 12.5
30 Jun 2026 12,196,436 19.3% 9.6

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