X0306 4 2019-02-13 0 0001351288 GW PHARMACEUTICALS PLC GWPH 0001754129 Gover Justin D. SOVEREIGN HOUSE, VISION PARK, HISTON CAMBRIDGE X0 CB24 9BZ UNITED KINGDOM 1 1 0 0 Chief Executive Officer Ordinary Shares 2019-02-13 4 S 0 22620 12.50 D 370445 D The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on October 16, 2018. These ordinary shares are represented by American Depositary Shares of the Issuer ("ADS"). Each ADS represents twelve ordinary shares of the Issuer. The reporting person acquired these shares on December 20, 2018 in connection with an exercise of options that were due to expire on December 24, 2018. The price reported in Column 4 is price per ordinary share ($150.0 per ADS). /s/ Justin D. Gover 2019-02-15