Atai Beckley N.V. (ATAI) Institutional Ownership

Ownership Summary

Atai Beckley N.V. (NASDAQ:ATAI) currently has 130 active institutional owners and shareholders as of today (December 2025), that have filed 13F forms with the Securities Exchange Commission (SEC).

• The collective stake of institutional investors in Atai Beckley moved to 29.0% in December 2025, a shift up from the 23.2% reported for September 2025.
• On a quarter-over-quarter basis, institutional holdings shifted by 109.13%, with a year-over-year an increase of 44.44% in the count of filers.
• The latest 13F cycle for Atai Beckley reveals that of 130 total investors, 84 funds grew their exposure, whereas 18 reduced theirs and 28 made no changes.
• Collectively, institutional investors increased their stake in Atai Beckley to 55.12Mn shares as of December 2025, a change that is up by 28.76Mn shares quarter on quarter and up 40.59Mn shares year over year.
• With 7.08Mn shares, ADAGE CAPITAL PARTNERS GP, L.L.C. commands the largest institutional position in Atai Beckley as of December 31, 2025, equating to 3.72% of the company.
• Among the most significant buyers of Atai Beckley during December 2025 were Deep Track Capital, LP (4.68Mn), ARK Investment Management LLC (3.31Mn), BlackRock, Inc. (2.81Mn), Foresite Capital Management VI LLC (2.75Mn), MARSHALL WACE, LLP (2.68Mn).
• Leading sellers of Atai Beckley stock in December 2025 included Pale Fire Capital SE (1.03Mn), CITADEL ADVISORS LLC (1.03Mn), Ally Bridge Group (NY) LLC (573.90K), JPMORGAN CHASE & CO (472.61K), D. E. Shaw & Co., Inc. (447.93K).
• The top 10 institutional holders of Atai Beckley for the quarter ending December 2025 included ADAGE CAPITAL PARTNERS GP, L.L.C. (7.08Mn), MORGAN STANLEY (4.82Mn), Deep Track Capital, LP (4.68Mn), ARK Investment Management LLC (3.31Mn), BlackRock, Inc. (2.81Mn), Foresite Capital Management VI LLC (2.75Mn), MARSHALL WACE, LLP (2.68Mn), RTW INVESTMENTS, LP (2.00Mn), AMERIPRISE FINANCIAL INC (1.74Mn), Ally Bridge Group (NY) LLC (1.71Mn).