The evaluation assesses ADB’s strategic approach to PSO and its likely effectiveness in achieving ADB’s overall objectives for the private sector and developing member countries (DMCs) in Asia and the Pacific. It covers 247 non-sovereign operations (NSO) long-term investments totaling $13.9 billion from 2017 to 2023. Despite significant global disruptions, including the COVID-19 pandemic and geopolitical tensions, ADB has made progress in expanding its PSO portfolio. However, the evaluation identifies areas for improvement in strategic prioritization, resource allocation, incentives, and the integration of private sector diagnostics into country partnership strategies. The findings and recommendations will be instrumental in shaping the next phase of ADB’s PSO operational plan.