This study aims to investigate the impact of third-party environmental information disclosure (EiD) on the corporate financial performance (CFP) of Chinese semiconductor companies listed on the Shanghai and Shenzhen Stock Exchanges from 2008 to 2022. Utilizing the two-way fixed effects model and method of moments quantile regression (MMQR), the results reveal that for each unit increase in third-party EiD index, there is a corresponding 0.87% increase in investments returns. However, this impact is moderated by the presence of female executives and strengthened by CEO political ties. The findings further identify financial constraints and green subsidies as mediating mechanisms, indicating that while financial constraints can deter third-party EiD adoption, green subsidies can facilitate it. High transparency does not always result in financial gains despite the general benefits. This study contributes to understanding the role of third-party EiD in driving corporate sustainability and provides empirical evidence regarding the financial and operational implications of voluntary engagement of the public in environmental governance. Such findings can inform corporate decision-making and policy formulation, encouraging more firms to participate in environmental regulation initiatives voluntarily.