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Syndax Pharmaceuticals SNDX

US equityMarket cap rank #2936
$17.83 +$0.23 (+1.31%)
Pre-market · Oct 6, 5:40 am ET · After hours $17.83 0.00%
Open$17.58
Prev close$17.60
Day range$17.57 – $17.98
Volume1.46M
Market cap$1.59B
P/E (TTM)–
Dividend yield–

Ownership & positioning

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

Institutional ownership122.8%-0.58 pts vs. prior quarter
Institutions holding297-3 vs. prior quarter
Insider trades (recent)26 buys / 22 sellsNet buying
Short interest23.14% of floatDays to cover 14.7 · as of 15 Sep 2026
Short-sale volume share20.6%5-day average of daily volume

Short-sale volume as % of daily volume

10%17%24%31%Sep '26Sep '26Oct '26

Large-order net flow, last 20 sessions

Net of large-order buying minus selling, in USD. Over this window: −$10.68M (4 inflow days, 16 outflow days).

The five largest holders on file together own 36.7% of shares outstanding.

Largest holders

  • BlackRock10.10%
  • Kynam Capital Management, LP9.02%
  • State Street Global Advisors6.34%
  • The Goldman Sachs Group, Inc.6.09%
  • Vanguard Capital Management, LLC5.11%
  • Deerfield Management Company, L.P.4.23%
  • Eversept Partners, L.P.3.13%
  • Bank of America Corporation2.94%

By investor type

  • Mutual Fund59.69%
  • Hedge Fund43.07%
  • Public Company10.26%
  • VC/PE Fund6.22%
  • Private Company2.08%
  • Individual/Insider1.07%
  • Insurance Company0.58%
  • Government Pension Fund0.58%

Reported short interest has fallen from 24.62% to 23.14% 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 20,660,449 23.1% 14.7
31 Aug 2026 21,681,907 24.3% 19.7
14 Aug 2026 22,902,431 25.6% 15.0
31 Jul 2026 22,665,216 25.6% 18.6
15 Jul 2026 20,816,110 23.5% 9.8
30 Jun 2026 21,812,785 24.6% 8.6

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