The pension fund assets of the City of Springfield Retirement System are invested through the Commonwealth of Massachusetts' Pension Reserves Investment Management (PRIM) Board. Detailed investment and asset allocation information can be found here. Below is a short description of the fund, provided by PRIM.

The PRIM Board is recognized by its peers and the investment industry as one of the preeminent public pensions in the world. During its more than a quarter century history, the PRIT Fund has achieved an average annual return of almost 10%, weathering many volatile economic and market cycles. The Fund has achieved this superior return because the PRIM Board's strict adherence to its investment disciplines and long-term investment focus.