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Harmony Biosciences HRMY

US equityMarket cap rank #2678Biotechnology
$39.92 +$0.28 (+0.71%)
Pre-market · Oct 6, 4:10 am ET · After hours $39.92 0.00%
Open$39.76
Prev close$39.64
Day range$39.51 – $40.77
Volume897.9K
Market cap$2.32B
P/E (TTM)12.9
Dividend yield–

Ownership & positioning

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

Institutional ownership107.9%-0.30 pts vs. prior quarter
Institutions holding394+0 vs. prior quarter
Insider trades (recent)24 buys / 23 sellsNet buying
Short interest7.95% of floatDays to cover 4.3 · as of 15 Sep 2026
Short-sale volume share23.8%5-day average of daily volume

Short-sale volume as % of daily volume

13%20%27%33%Sep '26Sep '26Oct '26

Large-order net flow, last 20 sessions

Net of large-order buying minus selling, in USD. Over this window: −$1.73M (6 inflow days, 14 outflow days).

The five largest holders on file together own 38.0% of shares outstanding.

Largest holders

  • BlackRock12.20%
  • Marshman Fund Trust II10.39%
  • FMR6.14%
  • Vanguard Portfolio Management, LLC4.95%
  • American Century Investment Management4.36%
  • Vanguard Capital Management, LLC4.13%
  • Dimensional Fund Advisors4.11%
  • HBM Healthcare Investments AG3.69%

By investor type

  • Mutual Fund68.43%
  • Hedge Fund13.74%
  • Private Company13.59%
  • VC/PE Fund5.95%
  • Public Company3.69%
  • Government Pension Fund1.28%
  • Family Office/Trust0.74%
  • Sovereign Wealth Fund0.25%

Reported short interest has held roughly steady near 7.95% 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 4,628,716 7.9% 4.3
31 Aug 2026 5,164,996 8.9% 9.1
14 Aug 2026 4,136,259 7.1% 4.8
31 Jul 2026 4,496,943 7.8% 5.1
15 Jul 2026 5,114,969 8.8% 6.8
30 Jun 2026 4,611,754 8.0% 5.7

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