No. 12-1996). The Regulation No. 12-1996 (thereafter "the Regulation") imposes penalties on firms whose IPO earnings forecasts are significantly overestimated in their IPO prospectuses.Specifically, the Regulation requires that IPO firms and their auditors must explain and apologize to the public in a CSRC designated newspaper if predicted earnings are overestimated by 10 -20% compared to actual earnings. IPO firms will be penalized if earnings forecasts are overestimated by more than 20% and the overestimation is deemed to be a fraudulent activity. Auditors will also be penalized if they issue an inappropriate audit opinion on a client company's IPO earnings forecasts. The Regulation also prohibits IPO firms from using earnings forecasts as a basis for setting issuance price.Although the Regulation was promulgated to improve the reliability of earnings forecasts in Chinese IPO prospectuses, it remains an empirical question because the legal enforcement infrastructure is weak in China. Moreover, Chinese IPO firms are closely connected with the government, which may provide opportunities for them to override the Regulation. Hence, whether the Regulation can enhance the reliability of earnings forecasts is an empirical question. This study examines whether the Regulation has achieved its initial 2 IPO earnings forecasts from some Commonwealth countries seem less accurate than Chinese IPO earnings forecasts. For example, the mean absolute forecast error is 289% for the Australian forecasts (Hartnett, 1993), 100% for the New Zealand forecasts (Mak, 1989), and 88% for the Canadian forecasts (Pedwell, Warsame, & Neu, 1994).3 objective. We find that the Regulation has been efficacious in reducing the overestimation of IPO earnings forecasts after it was promulgated on December 26, 1996. We also document a significant improvement in earnings forecast accuracy resulting from the promulgation of the Regulation.This study contributes to the literature in the following ways. First, to the best of our knowledge, this is the first study to investigate whether a securities regulation in an emerging market can enhance the reliability of corporate financial disclosure. Since there is rare research into the effects of securities regulations on corporate disclosure, the promulgation of the CSRC Regulation No. 12-1996 provides us an opportunity to enrich this research topic.Second, we document evidence on the efficacy of the CSRC Regulation No. 12-1996. Our findings may provide implications for future regulation promulgation to the CSRC and other securities regulators of emerging markets. Third, this study adds to prior research on the economic determinants of forecast accuracy. Our study suggests some ex ante criteria for evaluating Chinese earnings forecast accuracy.The remainder of the paper is organized as follows. Section 2 introduces institutional background. The third section develops hypotheses. Section 4 discusses research design.