X0508 4 2026-01-02 0002081043 AtaiBeckley Inc. ATAI 0002094202 Feilding-Mellen Cosmo C/O ATAI LIFE SCIENCES US, INC. C/O INDUSTRIOUS NYC, 250 WEST 34TH ST NEW YORK NY 10119 true false Common Stock 2026-01-02 4 S 0 39594 3.899 D 7663396 D Represents shares sold to satisfy the Reporting Person's tax liability on vesting of restricted stock units. The price reported is a weighted average price. The securities were sold in multiple transactions at per share prices ranging from $3.79 to $3.99. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price. /s/ Ryan Barrett, as attorney in fact 2026-01-06