Director/PDMR Shareholding

GW Pharmaceuticals PLC Director/PDMR Shareholding

30 June 2015

GW Pharmaceuticals PLC ("GW Pharmaceuticals" or the "Company")

NOTIFICATION OF INTERESTS OF DIRECTORS AND CONNECTED PERSONS

Cambridge, UK, 30 June 2015: GW Pharmaceuticals (AIM: GWP, NASDAQ:GWPH) hereby provides notification that the following transactions in the 0.1 pence ordinary shares of the Company took place on 29 June 2015.

Justin Gover, a Director and Chief Executive Officer of the Company, has acquired 16,834 0.1 pence ordinary shares of GW Pharmaceuticals plc (equivalent to 1,403 American Depositary Shares, or ADSs) from the GW employee benefit trust operated by GWP Trustee Company Ltd. 14,384 of these shares were originally conditionally gifted to Mr Gover in October 2000 under the terms of the GW Pharmaceuticals All Employee Share Ownership Plan. The remaining 2,450 shares were similarly conditionally gifted to Mr Gover in January 2002. All of the shares have been held within the employee benefit trust since they were originally conditionally gifted. Mr Gover elected to transfer the shares out of the ownership of the employee benefit trust into his personal shareholding. The transfer took place when the market price of the shares was 640.5 pence per share.

Following this transfer of shares, Mr Gover's total beneficial interest in the 0.1 pence ordinary shares of GW Pharmaceuticals plc has increased by 16,834 shares to 2,513,759 0.1 pence ordinary shares (equivalent to 209,480 ADSs), representing 0.96% of the Company's current issued share capital.

The total number of shares outstanding in the Company is 261,071,973 ordinary shares of 0.1 pence each.

For further information, please contact:

GW Pharmaceuticals PLC +44 (0)1980 557 000

Adam George, Company Secretary

Peel Hunt LLP (Nominated Adviser)

James Steel / Oliver Jackson +44 (0) 20 7418 8900