Merlin Entertainments IPO sees 9.5% gain on debut Tweet Follow me Shares in Merlin Entertainments, the owner of Alton Towers and Madame Tussauds, leapt 9.5% on the group’s stock market debut. The offer price had been set at 315p per share, but the stock rose quickly to 345p. Related posts: Will Future’s loss be Immediate’s gain Will Future's loss be Immediate's gain ITV sees almost £2.5b wiped off its value Comic-Con, Lionsgate To Debut VOD Channel