Adamantem Capital, an investment manager, completed the acquisition of a majority stake in Retail Zoo, the operator of Boost Juice and Betty’s Burgers, from Bain Capital, a private investment firm. Financial terms were not disclosed. “We are pleased to announce that Adamantem has signed binding documentation to acquire a majority stake in Retail Zoo, operator of leading brands Boost Juice and Betty’s Burgers. This will be the fifth investment for Adamantem’s Fund II,” Adamantem.