Mainstay is a European medical device company focused on bringing to market an innovative implantable neurostimulation system, ReActiv8, for people with disabling Chronic Low Back Pain. The Company is headquartered in Dublin, Ireland. It has subsidiaries operating in Ireland, the United States, Australia and Germany, and is listed on Euronext Paris (MSTY.PA) and the ESM of the Irish Stock Exchange (MSTY.IE).