X0306 4 2020-06-22 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 2020-06-22 5 A 0 E 1023 10.83 A 75510 D This Form 4 is being filed voluntarily to report the acquisition of 1,023 shares by the Reporting Person on June 22, 2020 pursuant to the Issuer's Employee Stock Purchase Plan. /s/ Mark S. Levine 2020-06-24