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Supernus Pharmaceuticals SUPN

US equityMarket cap rank #2627Drug Manufacturers - Specialty & Generic
$42.76 +$0.38 (+0.90%)
Market closed · Oct 6, 4:30 am ET · Last extended-hours $42.76 0.00%
Open$42.38
Prev close$42.38
Day range$42.38 – $43.20
Volume1.29M
Market cap$2.49B
P/E (TTM)–
Dividend yield–

Ownership & positioning

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

Institutional ownership104.6%-0.14 pts vs. prior quarter
Institutions holding398-1 vs. prior quarter
Insider trades (recent)20 buys / 26 sellsNet selling
Short interest8.57% of floatDays to cover 8.7 · as of 15 Sep 2026
Short-sale volume share17.5%5-day average of daily volume

Short-sale volume as % of daily volume

13%17%22%26%Sep '26Sep '26Oct '26

Large-order net flow, last 20 sessions

Net of large-order buying minus selling, in USD. Over this window: −$8.05M (7 inflow days, 13 outflow days).

The five largest holders on file together own 37.9% of shares outstanding.

Largest holders

  • BlackRock16.09%
  • Millennium Management LLC6.63%
  • Vanguard Portfolio Management, LLC5.69%
  • Vanguard Capital Management, LLC4.99%
  • Armistice Capital LLC4.55%
  • State Street Global Advisors4.23%
  • Macquarie Investment Management Business Trust4.09%
  • Jack Khattar3.81%

By investor type

  • Mutual Fund73.59%
  • Hedge Fund24.03%
  • Individual/Insider4.33%
  • Public Company2.50%
  • VC/PE Fund1.78%
  • Government Pension Fund1.18%
  • Private Company0.73%
  • Insurance Company0.72%

Reported short interest has fallen from 12.31% to 8.57% 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 4,989,421 8.6% 8.7
31 Aug 2026 4,671,860 8.0% 8.3
14 Aug 2026 4,147,629 7.1% 2.8
31 Jul 2026 4,816,923 8.3% 9.5
15 Jul 2026 4,850,861 8.4% 5.1
30 Jun 2026 7,142,803 12.3% 7.0

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