GW Pharmaceuticals plc Announces the Closing of U.S. Public Offering of American Depositary Shares (ADSs) Raising Approximately $179.2 Million on the NASDAQ Global Market

LONDON, May 5, 2015 /PRNewswire/ -- GW Pharmaceuticals plc (Nasdaq: GWPH, AIM: GWP, "GW" or the "Company"), a biopharmaceutical company focused on discovering, developing and commercializing novel therapeutics from its proprietary cannabinoid product platform, announced today the closing of the previously announced offering on the NASDAQ Global Market by GW of 1,600,000 American Depositary Shares (ADSs) at a price of $112.00 per ADS, raising gross proceeds of approximately $179.2 million (before deducting underwriting discount, commissions and offering expenses). GW has granted the underwriters a 30-day option to purchase up to an additional 240,000 ADSs at the public offering price less the underwriting discount.

Morgan Stanley, BofA Merrill Lynch and Cowen and Company acted as joint book-running managers for the offering. Piper Jaffray & Co. acted as lead manager.

The ADSs described above were offered by GW pursuant to a shelf registration statement filed by GW with the Securities and Exchange Commission ("SEC") that became automatically effective on May 7, 2014. The offering of the ADSs was made only by means of a prospectus and prospectus supplement. You may obtain these documents on the SEC's website at http://www.sec.gov. Alternatively, the prospectus and prospectus supplement may be obtained from Morgan Stanley & Co. LLC, Attention: Prospectus Department, 180 Varick Street, 2nd Floor, New York, New York 10014; BofA Merrill Lynch, 222 Broadway, New York, NY 10038, attention: Prospectus Department, email: [e-mail]; Cowen and Company, LLC, c/o Broadridge Financial Services, 1155 Long Island Avenue, Edgewood, NY, 11717, Attn: Prospectus Department; or from Piper Jaffray & Co., Attention: Prospectus Department, 800 Nicollet Mall, J12S03, Minneapolis, MN 55402.

This press release shall not constitute an offer to sell or the solicitation of an offer to buy nor shall there be any sale of these securities in any state or jurisdiction in which such offer, solicitation or sale would be unlawful prior to registration or qualification under the securities laws of any such state or jurisdiction.

About GW Pharmaceuticals plc

Founded in 1998, GW is a biopharmaceutical company focused on discovering, developing and commercializing novel therapeutics from its proprietary cannabinoid product platform in a broad range of disease areas. GW commercialized the world's first plant-derived cannabinoid prescription drug, Sativex^®, which is approved for the treatment of spasticity due to multiple sclerosis in 27 countries outside the United States. GW is advancing an orphan drug program in the field of childhood epilepsy with a focus on Epidiolex^®, which is in Phase 3 clinical development for the treatment of Dravet syndrome and which is also expected to enter Phase 3 clinical trials in the treatment of Lennox-Gastaut syndrome and Tuberous Sclerosis Complex. GW has a deep pipeline of additional cannabinoid product candidates which includes Sativex in Phase 3 clinical development as a potential treatment of pain associated with advanced cancer, as well as compounds in Phase 1 and 2 trials for glioma, ulcerative colitis, type 2 diabetes, and schizophrenia. For further information, please visit www.gwpharm.com.