X0306 4 2020-03-02 0 0001419600 Flexion Therapeutics Inc FLXN 0001617236 Levine Mark S. C/O FLEXION THERAPEUTICS, INC. 10 MALL ROAD, SUITE 301 BURLINGTON MA 01803 0 1 0 0 General Counsel Common Stock 2020-03-02 4 A 0 31000 0.00 A 74487 D Stock option (right to buy) 15.78 2020-03-02 4 A 0 15500 0.00 A 2030-03-01 Common Stock 15500 15500 D Represents restricted stock unit award granted under the Issuer's 2013 Equity Incentive Plan. Twenty-five percent (25%) of the shares shall vest on the one year anniversary of January 1, 2020 (the "Vesting Commencement Date") and thereafter one-forty-eighth (1/48th) of the total shares shall vest each month following the one year anniversary of the Vesting Commencement Date, so that all of the shares shall be vested four (4) years after the Vesting Commencement Date. /s/ Mark S. Levine 2020-03-03