Block Listing Application

GW Pharmaceuticals PLC ("GW Pharmaceuticals")

BLOCK LISTING APPLICATION

Porton Down, UK, 9 June 2014: GW Pharmaceuticals (AIM: GWP) hereby provides notification that application has today been made to the London Stock Exchange for admission to trading on AIM of four blocks of new ordinary shares of 0.1p each.

These new ordinary shares will be issued from time to time pursuant to the exercise of employee share options under the GW Pharmaceuticals share options schemes, as follows:

168,650 new ordinary shares for issue by the GW Pharmaceuticals Executive Management Incentive Share Option Scheme 2001.

122,613 new ordinary shares for issue by the GW Pharmaceuticals Company Share Option Scheme 2001

500,000 new ordinary shares for issue by the GW Pharmaceuticals Unapproved Share Option Scheme 2001.

500,000 new ordinary shares for issue by the GW Pharmaceuticals Long Term Incentive Plan 2008

On exercise the shares will be issued credited as fully paid and will rank pari passu with the existing ordinary shares in issue.

It is expected that such admission will become effective on 13 June 2014.

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