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Obsidian Therapeutics OBX

US equityMarket cap rank #3397Biotechnology
$13.20 −$0.02 (-0.15%)
Pre-market · Oct 8, 8:20 am ET · After hours $13.20 0.00%
Open$13.02
Prev close$13.22
Day range$12.80 – $13.88
Volume359.0K
Market cap$815.40M
P/E (TTM)20.3
Dividend yield–

Ownership & positioning

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

Institutional ownership27.3%+27.29 pts vs. prior quarter
Institutions holding7+7 vs. prior quarter
Short interest0.41% of floatDays to cover 1.0 · as of 15 Sep 2026
Short-sale volume share26.3%5-day average of daily volume

Short-sale volume as % of daily volume

13%22%31%39%Sep '26Sep '26Oct '26

Large-order net flow, last 20 sessions

Net of large-order buying minus selling, in USD. Over this window: −$940.0K (11 inflow days, 9 outflow days).

Net flow by order size, last 20 sessions

−$1.2MSuper+$263.2KBig+$1.2MMid+$5.3MSmall

Super/Big orders approximate institutional-size trades; Mid/Small approximate retail-size trades. Net buy minus sell value in each bucket, summed over the window.

The five largest holders on file together own 25.8% of shares outstanding.

Largest holders

  • RA Capital Management, L.P.6.77%
  • Paradigm Biocapital Advisors LP6.64%
  • Atlas Venture Advisors, Inc.5.12%
  • Deep Track Capital, LP3.77%
  • Novo Holdings A/S3.55%
  • Madan Jagasia1.46%
  • Franklin Resources1.35%
  • Parameswaran Hari0.37%

By investor type

  • VC/PE Fund19.20%
  • Hedge Fund6.64%
  • Individual/Insider2.39%
  • Mutual Fund1.45%

Reported short interest has risen from 0.06% to 0.41% of float over the last 3 biweekly reports (14 Aug 2026 to 15 Sep 2026).

Recent institutional activity

HolderTypePeriodShare changeNew stake
BlackRock Mutual Fund 2026/Q3 +61,732 0.1%
Paradigm Biocapital Advisors LP Hedge Fund 2026/Q3 +4,101,576 6.6%
Franklin Resources Mutual Fund 2026/Q3 +833,295 1.3%
RA Capital Management, L.P. VC/PE Fund 2026/Q3 +4,181,291 6.8%
Atlas Venture Advisors, Inc. VC/PE Fund 2026/Q3 +3,160,760 5.1%
Deep Track Capital, LP VC/PE Fund 2026/Q3 +2,327,223 3.8%
Novo Holdings A/S VC/PE Fund 2026/Q3 +2,192,730 3.5%
Madan Jagasia Individual/Insider 2026/Q3 +903,500 1.5%
Parameswaran Hari Individual/Insider 2026/Q3 +230,246 0.4%
Dana Alexander Individual/Insider 2026/Q3 +146,056 0.2%
Maria Fardis Individual/Insider 2026/Q3 +97,543 0.2%
Robert Ross Individual/Insider 2026/Q3 +43,335 0.1%
Heidi Hagen Individual/Insider 2026/Q3 +35,901 0.1%
Matthew Norkunas Individual/Insider 2026/Q3 +19,794 0.0%

Institutional buy/sell activity by reporting period, largest moves first.

Short interest, by report

Report dateShares short% of floatDays to cover
15 Sep 2026 253,084 0.4% 1.0
31 Aug 2026 81,457 0.1% 1.0
14 Aug 2026 36,102 0.1% 1.0

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