X0306 4 2014-03-03 0 0001419600 Flexion Therapeutics Inc FLXN 0001597407 Clayman Michael D. C/O FLEXION THERAPEUTICS, INC. 10 MALL ROAD, SUITE 301 BURLINGTON MA 01803 1 1 0 0 President and CEO Stock option (right to buy) 17.61 2014-03-03 4 A 0 200000 0.00 A 2024-03-02 Common Stock 200000 200000 D Twenty-five percent (25%) of the shares subject to the option shall vest one year after March 3, 2014; thereafter one-forty-eighth (1/48th) of the shares subject to the option shall vest each month following the one year anniversary of March 3, 2014, so that all of the shares subject to the option shall be vested four (4) years after March 3, 2014. /s/ Lisa Davidson, Attorney-in-Fact 2014-03-04