X0508 4 2025-01-16 false 0001597553 Sage Therapeutics, Inc. SAGE 0001951944 Gault Laura C/O SAGE THERAPEUTICS, INC 55 CAMBRIDGE PARKWAY CAMBRIDGE MA 02142 false true false false Chief Medical Officer false Common Stock 2025-01-16 4 A false 24000.00 0.00 A 35334.00 D Consists of shares of common stock issuable under 24,000 restricted stock units ("RSUs"). Each RSU represents the right to receive one share of common stock upon vesting. These RSUs are scheduled to vest in equal annual installments over four years with the first installment vesting on January 16, 2026. Reflects beneficial ownership balance which includes 597 shares purchased on December 31, 2024 under the Sage Therapeutics, Inc. 2014 Employee Stock Purchase Plan. Brandon Marsh, attorney in fact for Laura Gault 2025-01-21