X0306 4 2019-01-03 0 0001351288 GW PHARMACEUTICALS PLC GWPH 0001584516 Secor Alicia SOVEREIGN HOUSE, VISION PARK, HISTON CAMBRIDGE X0 CB24 9BZ UNITED KINGDOM 1 0 0 0 Ordinary Shares 2019-01-03 4 M 0 3580 0.0013 A 20172 D Stock Options 0.0013 2019-01-03 4 M 0 3580 0.00 D Ordinary Shares 3580 0 D Vesting of restricted stock units previously reported as stock options on the reporting person's Form 3 filed on October 1, 2018. These ordinary shares are subsequently converted into American Depositary Shares ("ADS") of the Issuer. Each ADS represents twelve ordinary shares of the Issuer. Inadvertently late filing. Converted from British Pounds Sterling to U.S. Dollars using currency ratio of 1.00 British Pound Sterling = 1.31 U.S. Dollars as of March 13, 2019. Includes 7,160 and 9,432 ordinary shares underlying restricted stock units previously reported as stock options on the reporting person's Form 3 filed on October 1, 2018 and Form 4 filed on March 5, 2019, respectively. The reporting person's Form 3 filed on October 1, 2018 contained stock options to purchase 10,740 ordinary shares vesting on January 3, 2021 and expiring on March 15, 2022. These securities are restricted stock units with a nominal exercise price and vest automatically upon vesting date. The correct vesting schedule of these restricted stock units is as follows: 3,580 ordinary shares vested on January 3, 2019; 3,580 ordinary shares will vest on January 3, 2020; and 3,580 ordinary shares will vest on January 3, 2021. The remaining securities following the reported transaction are reported in Column 5 of Table I. /s/ Alicia Secor 2019-03-15