What is the effect of contractors' nonprofit and for-profit ownership on the scope and nature of performance measurement used by government agencies? Quantitative and qualitative data were generated through semistructured interviews administered to a sample of state and local public agencies and private contractors across five jurisdictions. The findings of this study suggest that monitoring officers working with nonprofit rather than for-profit contractors are more likely to rely on qualitative performance data and examine equitable access to services, contractors' reputation, and compliance with industry rules and regulations. Although organizational ownership may not be well understood by practitioners, performance appears to be conceptualized differently across sectors. The author calls for a better understanding of the impact of the identified differences in performance measurement on the effectiveness of contract monitoring.