X0306 4 2015-02-26 0 0001419600 Flexion Therapeutics Inc FLXN 0001598099 Bodick Neil C/O FLEXION THERAPEUTICS, INC. 10 MALL ROAD, SUITE 301 BURLINGTON MA 01803 0 1 0 0 Chief Medical Officer Common Stock 2015-02-26 4 S 0 4000 22.4415 D 82937 D Common Stock 388683 I By Versant Development Fund III, LLC Reported transaction occurred pursuant to Rule 10b5-1 Plan adopted December 17, 2014. The weighted average sale price for the transaction reported was $22.4415, and the range of prices were between $22.04 and $23.01. Upon request by the SEC staff, the Issuer, or any security holder of the Issuer, full information regarding the number of shares purchased or sold at each separate price will be provided. Shares held by Versant Development Fund III, LLC. The Reporting Person is a manager and minority member of Versant Development Fund III, LLC. The Reporting Person disclaims any beneficial ownership of the shares held by Versant Development Fund III, LLC except to the extent of his pecuniary interest in these shares. /s/ Lisa Davidson, Attorney-in-Fact 2015-02-26