The Canada Pension Plan (CPP) (French: Régime de pensions du Canada) is a contributory, earnings-related social insurance program. It forms one of the two major components of Canada's public retirement income system, the other component being Old Age Security (OAS). Other parts of Canada's retirement system are private pensions, either employer-sponsored or from tax-deferred individual savings (known in Canada as a Registered Retirement Savings Plan). As of March 31, 2016, the CPP Investment Board manages over C$278 billion in investment assets for the Canada Pension Plan on behalf of eighteen million Canadians, making it among the ten largest sovereign wealth funds in the world.