Ropes & Gray is advising private equity firm Bain Capital Partners on a $1 billion stake acquisition in Indian business process management company Genpact Ltd. 

Investors General Atlantic Holding Co. and Oak Hill Capital Partners are selling a collective 30-percent state in the Gurgaon, India-based company. After the sale, both companies will retain a collective a 10-percent stake in Genpact. The rest of Genpact will continue to be publicly traded.