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Eton Pharmaceutical ETON

US equityMarket cap rank #2940
$55.62 +$0.26 (+0.47%)
Pre-market · Oct 6, 7:10 am ET · After hours $55.62 0.00%
Open$55.85
Prev close$55.36
Day range$54.50 – $56.86
Volume405.5K
Market cap$1.59B
P/E (TTM)142.6
Dividend yield–

Ownership & positioning

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

Institutional ownership69.0%-2.90 pts vs. prior quarter
Institutions holding191+5 vs. prior quarter
Insider trades (recent)28 buys / 17 sellsNet buying
Short interest5.40% of floatDays to cover 3.5 · as of 15 Sep 2026
Short-sale volume share19.2%5-day average of daily volume

Short-sale volume as % of daily volume

16%19%22%25%Sep '26Sep '26Oct '26

Large-order net flow, last 20 sessions

Net of large-order buying minus selling, in USD. Over this window: −$1.31M (8 inflow days, 12 outflow days).

The five largest holders on file together own 31.8% of shares outstanding.

Largest holders

  • Opaleye Management Inc.9.46%
  • EcoR1 Capital, LLC7.60%
  • BlackRock6.63%
  • Nantahala Capital Management, LLC4.11%
  • Vanguard Capital Management, LLC4.01%
  • Sean Brynjelsen3.36%
  • Morgan Stanley2.63%
  • State Street Global Advisors2.46%

By investor type

  • Hedge Fund30.53%
  • Mutual Fund29.61%
  • Public Company4.92%
  • Individual/Insider4.90%
  • Private Company1.95%
  • Insurance Company0.91%
  • Sovereign Wealth Fund0.60%
  • Government Pension Fund0.35%

Reported short interest has risen from 5.29% to 5.40% 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 1,542,982 5.4% 3.5
31 Aug 2026 1,347,971 4.7% 2.0
14 Aug 2026 1,427,797 5.0% 2.2
31 Jul 2026 1,313,359 4.8% 2.1
15 Jul 2026 1,226,286 4.5% 3.0
30 Jun 2026 1,449,499 5.3% 3.0

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