LAN Faqin, LI Guodong, HU Xiaomin
2026, 0(5): 68-83.
Share repurchase is a powerful tool to maintain corporate investment value and boost investor confidence, and has gradually become one of the important means of capital operation for listed companies.In recent years, China's share repurchase market shows obvious similarity, synchronization and clustering characteristics.Focal enterprises will pay attention to and follow the share repurchase behaviors of the same group of enterprises out of the rational motive of seeking profit and avoiding harm as well as the proxy pressure.This paper takes the share repurchase of enterprises as a major financial strategic decision as an entry point, selects the financial data of A-share listed companies from 2015 to 2022, and deeply explores the existence of the cohort effect of share repurchase of enterprises and its internal mechanism from the perspective of similarity of operational network.We find that there is a significant share repurchase cohort effect among firms under similar operational networks, and this finding remains significant after replacing the cohort factor, considering the endogeneity due to the reflection problem, and other robustness tests.Mechanism analysis shows that focal firms maintain similar and synchronized strategic interactions with their cohort firms due to information learning, pressure competition and ability concealment mechanism, which triggers the cohort effect of share repurchases by focal firms. Heterogeneity analysis shows that the cohort effect is more pronounced for private focal firms, focal firms with higher institutional shareholdings, and focal firms with severely undervalued share prices.The findings of this paper enrich the research on the motivation of share repurchase from the perspective of the cohort effect, provide a brand new entry perspective for understanding the wave of share repurchase in China's capital market in recent years, and enhance the empirical evidence and value references for the government and organizational groups to enhance the effectiveness of regulation and the strategic interaction and cooperation of the cohort firms.