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ACADIA Pharmaceuticals ACAD

US equityMarket cap rank #2381
$20.11 +$0.16 (+0.80%)
Market closed · Oct 5, 10:20 pm ET · Last extended-hours $20.25 +0.70%
Open$20.05
Prev close$19.95
Day range$19.57 – $20.45
Volume3.15M
Market cap$3.47B
P/E (TTM)9.0
Dividend yield–

Ownership & positioning

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

Institutional ownership98.9%+0.00 pts vs. prior quarter
Institutions holding425+0 vs. prior quarter
Insider trades (recent)36 buys / 14 sellsNet buying
Short interest5.61% of floatDays to cover 7.2 · as of 15 Sep 2026
Short-sale volume share16.5%5-day average of daily volume

Short-sale volume as % of daily volume

8%13%18%22%Sep '26Sep '26Oct '26

Large-order net flow, last 20 sessions

Net of large-order buying minus selling, in USD. Over this window: −$13.99M (5 inflow days, 15 outflow days).

The five largest holders on file together own 52.5% of shares outstanding.

Largest holders

  • Baker Bros. Advisors LP24.91%
  • BlackRock13.07%
  • State Street Global Advisors5.27%
  • Vanguard Portfolio Management, LLC5.13%
  • RTW Investments, LP4.15%
  • Vanguard Capital Management, LLC3.87%
  • Dimensional Fund Advisors2.14%
  • Geode Capital Management, LLC1.95%

By investor type

  • Mutual Fund51.74%
  • Hedge Fund40.97%
  • Public Company2.20%
  • Government Pension Fund1.07%
  • VC/PE Fund0.97%
  • Sovereign Wealth Fund0.97%
  • Individual/Insider0.55%
  • Insurance Company0.49%

Reported short interest has fallen from 6.40% to 5.61% 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 9,666,972 5.6% 7.2
31 Aug 2026 9,739,720 5.7% 6.9
14 Aug 2026 9,478,912 5.5% 4.5
31 Jul 2026 10,812,093 6.3% 8.0
15 Jul 2026 11,029,444 6.4% 7.6
30 Jun 2026 10,951,125 6.4% 4.8

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