Description Outsource Partners International (OPI) doesn't mind sharing the work load when it comes to numbers. The firm provides outsourced finance and accounting services to businesses around the world. It specializes in such areas as payroll, and tax compliance, SEC reporting, and risk management. Its clients, which have included Mirant (now GenOn Energy) and Service Corporation International, have the option to outsource just one function or their entire accounting operations. OPI serves a range of industries, including energy, financial services, hospitality, manufacturing, telecom, transportation, and not-for-profit. Founded in 2002, it operates in the US, Asia/Pacific, and Europe. Outsourcing firm EXL is buying OPI.