Atai Beckley N.V. (ATAI) Institutional Ownership

Ownership Summary

A total of 32 institutions have reported a stake in Atai Beckley N.V. (NASDAQ:ATAI) as of December 2025, according to recent 13F filings with the SEC.

• These investors collectively held 0.9% of the company's total shares outstanding in December 2025, down from 20.3% in September 2025.
• In percentage terms, this reflects as a holdings change of 44.11% quarter on quarter, and a decrease of 64.44% year over year.
• Among the 32 institutional holders of Atai Beckley, 15 added to their stakes while 4 trimmed their positions and 13 held steady.
• Collectively, institutional investors increased their stake in Atai Beckley to 2.05Mn shares as of December 2025, a change that is up by 627.34K shares quarter on quarter and down 12.48Mn shares year over year.
• Brown University's holding of 718.50K shares as of December 31, 2025 makes it the primary institutional investor in Atai Beckley, owning 0.33% of the stock.
• Among the most significant buyers of Atai Beckley during December 2025 were STABLEFORD CAPITAL II LLC (291.56K), Brummer Multi-Strategy AB (234.91K), KLP KAPITALFORVALTNING AS (69.80K), Carrera Capital Advisors (66.81K), Caprock Group, LLC (52.08K).
• Leading sellers of Atai Beckley stock in December 2025 included VANGUARD GROUP INC (290.44K), KINGSWOOD WEALTH ADVISORS, LLC (10.00K), Hunter Perkins Capital Management, LLC (2.40K), Westside Investment Management, Inc. (1.00K).
• The top 10 institutional holders of Atai Beckley for the quarter ending December 2025 included Brown University (718.50K), STABLEFORD CAPITAL II LLC (291.56K), Brummer Multi-Strategy AB (234.91K), VANGUARD GROUP INC (153.58K), KLP KAPITALFORVALTNING AS (69.80K), Carrera Capital Advisors (66.81K), Caprock Group, LLC (52.08K), STEPHENS INC /AR/ (46.98K), Zurcher Kantonalbank (Zurich Cantonalbank) (46.38K), Arizona State Retirement System (46.06K).