Manuscript Type Empirical Research Question/Issue On April 2005, the China Securities Regulatory Commission (CSRC) launched the split‐share structure reform to mitigate principal–principal agency problems. Using the reform as an exogenous shock, we examine the impact of principal–principal agency problems on stock price crash risk. Specifically, this study attempts to answer two questions: (1) Does the split‐share structure reform in China decrease stock price crash risk? (2) Is the above effect induced by the mitigation of principal–principal agency problems? Research Findings/Insights We find that the reform induces a significant decrease in crash risk after controlling for other predictors of crash risk, and this effect is more pronounced in firms with a higher proportion of shares held by controlling shareholders. Moreover, we find that the negative impact of the reform on stock price crash risk is more pronounced in firms with a high level of tunneling prior to the reform, which indicates that reform induces less tunneling, and adversely affects crash risk. Theoretical/Academic Implications This study contributes to the literature in two ways. First, this study constitutes the first effort to explore the determinants of stock price crash risk from the perspective of principal–principal agency problems. Second, this study enriches the growing literature on the economic consequences of the split‐share structure reform in China. Practitioner/Policy Implications We draw two important implications from our results. First, our findings highlight that regulatory intervention is an important way to enhance corporate governance. This is particularly beneficial in China, a transitional economy which may lag in terms of general protection of investors and information disclosure. Second, this study also confirms that minority shareholders and listed firms benefit from the reform. Both are crucial to the healthy development of the capital market in China.