X0306 4 2020-01-03 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 2020-01-03 4 S 0 1536 8.53 D 17736 D Represented by American Depositary Shares of the Issuer ("ADS"). Each ADS represents twelve ordinary shares of the Issuer. The price reported in Column 4 is a weighted average price per ordinary share ($102.35 per ADS). These share were sold in multiple transactions at prices ranging from $8.51 per ordinary share ($102.10 per ADS) to $8.53 per ordinary share ($102.36 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/ Alicia Secor 2020-01-07