Using data on Chinese firms with the unique state ownership structure of stateowned enterprises (SOEs), we examine whether institutional investors can help reduce the required returns on equity for SOEs or non-SOEs, and if so, the underlying channels. We find that an increase in the shareholdings of institutions, especially independent institutions, can reduce the required returns. This effect is more prominent in non-SOEs than in SOEs, indicating that state ownership may limit the effect by which institutional investors reduce the required returns. In addition, institutional investors promote corporate social responsibility in invested firms and may thereby reduce the required returns on equity.