Innovation as a Mediating Mechanism Between ESG Performance and Financial Performance

Environmental, Social, and Governance (ESG) performance has become a central criterion for evaluating corporate sustainability. Yet the empirical relationship between ESG and financial performance remains contested, especially in emerging markets where institutions are evolving. This study examines how ESG performance relates to corporate financial performance among Chinese A-share listed companies and tests whether corporate innovation functions as a transmission mechanism. Using a balanced panel (2015–2023), we combine System Generalized Method of Moments (System GMM) with a non-parametric Bootstrap mediation procedure. We decompose ESG into environmental, social, and governance dimensions and distinguish between innovation input (R&D investment) and innovation output (patent generation). The results indicate a positive directional association between overall ESG performance and return on assets (ROA), but the direct financial effect is primarily driven by the governance dimension. Environmental and social performance do not show robust direct effects. However, ESG significantly promotes corporate innovation, especially patent output. Bootstrap mediation results confirm that patents represent a robust and universal channel through which ESG contributes to financial performance, while the R&D pathway is more conditional. The findings also indicate ownership heterogeneity between state-owned and private enterprises. By distinguishing between innovation input and output, this study explains how ESG practices may be translated into economic value in an emerging market context distinct from advanced economies.