X0306 4 2020-02-03 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 2020-02-03 4 M 0 202224 0.0013 A 765749 D Ordinary Shares 2020-02-03 4 S 0 71712 9.57 D 694037 D Ordinary Shares 2020-02-03 4 S 0 110964 9.63 D 583073 D Ordinary Shares 2020-02-03 4 S 0 19548 9.71 D 563525 D Stock Options 0.0013 2020-02-03 4 M 0 202224 0.00 D 2019-02-15 2020-03-15 Ordinary Shares 202224 7 D Exercise of stock options. Following the exercise, these shares were converted into American Depositary Shares ("ADS") of the Issuer. Each ADS represents twelve ordinary shares of the Issuer. Converted from British Pounds Sterling to U.S. Dollars using currency ratio of 1.00 British Pound Sterling = 1.30 U.S. Dollars as of February 3, 2020. The sales reported were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on December 3, 2019. Represented by ADSs. The price reported in Column 4 is a weighted average price per ordinary share ($114.85 per ADS). These share were sold in multiple transactions at prices ranging from $9.51 per ordinary share ($114.16 per ADS) to $9.60 per ordinary share ($115.15 per ADS), inclusive. The Reporting Person understands to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range. The price reported in Column 4 is a weighted average price per ordinary share ($115.52 per ADS). These share were sold in multiple transactions at prices ranging from $9.60 per ordinary share ($115.16 per ADS) to $9.68 per ordinary share ($116.14 per ADS), inclusive. The Reporting Person understands to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range. The price reported in Column 4 is a weighted average price per ordinary share ($116.54 per ADS). These share were sold in multiple transactions at prices ranging from $9.68 per ordinary share ($116.19 per ADS) to $9.76 per ordinary share ($117.07 per ADS), inclusive. The Reporting Person understands to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range. /s/ Justin D. Gover 2020-02-05