This paper evaluates the overall investment performance of Australian pension funds by examining the determinants of risk-adjusted performance, and the relationship between risk, returns, and expenses. Using quarterly return data for 225 pension funds comprising 68% of total prudentially regulated pension fund assets, we find significant differences exist across fund types. On both a net return and risk-adjusted performance basis, not-for-profit funds significantly outperformed for-profit funds over the seven years to June 2002. We suggest that the performance difference is consistent with the hypothesis that agency costs in for-profit funds (due to non-representative trustee board structures and potential board member conflicts of interest) are greater than agency costs in not-for-profit funds (with representative trustee boards).