Co-operative Superannuation Society Pension Plan is a union pension fund based in Saskatoon, Canada. Established in 1939, the CSS Pension Plan supplies retirement products and services to co-operatives and credit unions across Canada through a member-owned, non-profit pension society. The Co-operative Superannuation Society (CSS) is a democratically controlled, non-profit pension society that serves as the trustee and administrator of the pension fund. The assets of the fund are managed and governed by an executive management team.