We explore the unique heterogeneity feature of the Chinese market to examine the relationship between firms' share collateralization by its largest shareholders and corporate repurchases. Furthermore, we analyze the divergent incentives resulting in different consequences for the performance of private firms and state-owned enterprises (SOEs). The policy effect of an amendment to the Company Law of the People's Republic of China is studied using the difference-in-differences method. The measure is changed to ensure the reliability and robustness of the causality results between collateralization and repurchases. The results show that higher collateralization increases the likelihood of firms' share repurchases. The repurchase incentive of firm performance diverges between private firms and SOEs. Some SOEs even attempt to support the policy and blindly herd to repurchase shares; however, when SOEs are assured of their operational efficiency, repurchases increase their profitability. Private firms use repurchases as a share price stabilizer to protect the interests of their large shareholders rather than to benefit minority and small shareholders. These results provide policy feedback and demonstrate the complexity of controlling for corporate incentives when market interests are highly mixed.
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