PSERS, founded in 1917, began operations in 1919 to oversee a statewide defined benefit pension plan for public school employees. PSERS' role expanded upon the passage of Act 5 of 2017 to include oversight of two new hybrid options consisting of defined benefit and defined contribution (DC) components and a stand-alone DC plan. As of Dec. 31, 2021, PSERS had net assets of $75.1 billion and a membership of about 256,000 active, 240,000 retired school employees and 26,000 vested inactive members.