The Ontario Teachers' Pension Plan Board (Ontario Teachers'; French: Régime de retraite des enseignantes et des enseignants de l'Ontario or RREO) is an independent organization responsible for administering defined-benefit pensions for school teachers of the Canadian province of Ontario. Ontario Teachers' also invests the plan's pension fund, and is one of the world’s largest institutional investors. The plan is a multi-employer pension plan, jointly sponsored by the Government of Ontario and the Ontario Teachers' Federation. - Source: Wikipedia