X0306 4 2018-12-07 false 0001597553 Sage Therapeutics, Inc. SAGE 0001612859 Kanes Stephen C/O SAGE THERAPEUTICS, INC. 215 FIRST STREET CAMBRIDGE MA 02142 false true false false Chief Medical Officer Stock Option (Right to Buy) 47.70 2018-12-07 4 A false 6600.00 0.00 A 2027-02-06 Common Stock 6600.00 6600.00 D On February 6, 2017, the reporting person was granted an option to purchase 20,000 shares of common stock. The option vests upon the achievement of certain milestones, one of which was met on December 7, 2018, resulting in the vesting of the option as to 6,600 shares. /s/ Anne Marie Cook as Attorney-in-Fact for Stephen Kanes 2018-12-11