Ontario Pension Board (OPB) is the administrator of the Public Service Pension Plan (PSPP), a major defined- benefit pension plan sponsored by the Government of Ontario. Our membership base is made up of certain employees of the provincial government and our agencies, boards and commissions.With $23 billion in assets and with more than 42,100 members, 35,800 retired members and 5,500 former members, the PSPP is one of the largest and oldest pension plans in Canada.