Bain Capital is buying itself some bubble tea. The private-equity firm is acquiring the fast-growing tea brand Gong Cha from TA Associates. Gong Cha is one of the biggest bubble tea chains in the U.S. Bain believes that Gong Cha has plenty of room to grow in crucial markets, particularly the Americas and across Asia Pacific. Gong Cha recently acquired the master franchisee rights in both Eastern U.S. states and along the West Coast.