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AtaiBeckley ATAI

US equityMarket cap rank #2563Biotechnology
$7.35 +$0.00 (0.00%)
Market closed · Oct 5, 10:20 pm ET
Open$0.00
Prev close$7.35
Day range$0.00 – $0.00
Volume0.00
Market cap$2.73B
P/E (TTM)–
Dividend yield–

Ownership & positioning

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

Institutional ownership54.8%-0.81 pts vs. prior quarter
Institutions holding271-1 vs. prior quarter
Insider trades (recent)13 buys / 37 sellsNet selling
Short interest5.18% of floatDays to cover 2.8 · as of 31 Aug 2026
Short-sale volume share12.6%5-day average of daily volume

Short-sale volume as % of daily volume

8%13%19%24%Aug '26Sep '26Sep '26

Large-order net flow, last 20 sessions

Net of large-order buying minus selling, in USD. Over this window: −$46.64M (5 inflow days, 15 outflow days).

The five largest holders on file together own 31.2% of shares outstanding.

Largest holders

  • Apeiron Investment Group Limited14.55%
  • BlackRock6.90%
  • Deep Track Capital, LP3.89%
  • Vanguard Capital Management, LLC3.59%
  • Galaxy Group Investments LLC2.28%
  • State Street Global Advisors2.23%
  • Cosmo Mellen2.07%
  • Geode Capital Management, LLC1.87%

By investor type

  • Mutual Fund25.26%
  • VC/PE Fund19.94%
  • Hedge Fund5.49%
  • Family Office/Trust2.36%
  • Individual/Insider2.29%
  • Public Company0.96%
  • Government Pension Fund0.22%
  • Endowment Fund0.19%

Reported short interest has fallen from 6.40% to 5.18% of float over the last 6 biweekly reports (15 Jun 2026 to 31 Aug 2026).

Short interest, by report

Report dateShares short% of floatDays to cover
31 Aug 2026 19,201,689 5.2% 2.8
14 Aug 2026 16,855,502 4.5% 2.8
31 Jul 2026 19,857,150 5.4% 1.0
15 Jul 2026 37,787,570 10.3% 4.0
30 Jun 2026 30,262,372 8.2% 2.4
15 Jun 2026 23,547,225 6.4% 4.4

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