The leader of this gang is GW Pharmaceuticals (NASDAQ: GWPH). Based in the U.K., GW Pharma is largely a development-stage biotech. The one product it has on shelves is Sativex, a spray medication that treats spasticity in patients suffering from multiple sclerosis. GW Pharma has received approval in 16 markets for the drug, and the company's application is pending in another 12 (the U.S., however, is not among either group).