Right now there are rules that prohibit the comingling of funds. So if a union plan wants to have a multi-employer-sponsored arrangement they can, with the union named as the plan sponsor. If a bunch of small ski resort operators want to get together to have a pension plan, pool their assets and administrative overhead costs and divvy them up, they can't do that because a financial institution like Manulife or Royal of Canada is not allowed to be a plan sponsor and take on the legal role of a plan sponsor.
On April 22nd, 2010. See this statement in context.