We evaluate whether voluntary corporate social responsibility (CSR) disclosure is influenced by the economic incentives of controlling shareholders. To examine this research question, we apply the natural experiment setting based on the Split Share Structure Reform in China. Following this Reform, Chinese state shareholders are allowed to trade their shares in the stock market, which increases their incentives to maximize the market value of the firms that they control. We present empirical evidence of increased CSR disclosure among listed state-owned enterprises after this Reform. This evidence suggests that the economic incentives of key stakeholders play an important role in promoting voluntary CSR disclosures.