The nightclub chain Jumpin' Jaks is likely to be offloaded by theme restaurants and nightclub owner Luminar. Nick Beighton, finance director, said Luminar already had offers on 4 of Jumpin' Jaks' 16 sites and was considering what to do with the rest. Trading at Luminar's entertainment division, which includes 56 Chicago Rock Cafes as well as the Jumpin' Jaks clubs, has been below expectations.