The Impact of Academic Independent Directors of Bond Issuers on Bond Rating Quality

Abstract

This study empirically examines the impact of academic independent directors on bond rating quality, measured by bond credit spreads, using a sample of Chinese A-share listed companies from 2010 to 2023. The empirical results demonstrate that the presence of academic independent directors significantly reduces bond credit spreads, indicating a substantial improvement in bond rating quality. This finding remains robust after a series of robustness tests, including excluding the COVID-19 pandemic period, adopting alternative measure of the dependent variable, adding additional governance control variables, and addressing endogeneity concerns through lagged explanatory variables and two-stage least squares (2SLS) estimation. Mechanism analyses reveal that academic independent directors enhance bond rating quality by boosting corporate innovation, improving social responsibility disclosure quality, and increasing information transparency. Heterogeneity analyses further show that this positive effect is more pronounced in non-state-owned enterprises, firms with higher board meeting frequency, and those with a lower proportion of academic independent directors. Our analysis moves beyond surface-level associations to offer three distinct contributions. We transplant the academic-director literature into the bond pricing domain, decode the operational channels from director presence to rating assignments, and distill practical takeaways for issuers, rating firms, and policy makers operating within fixed-income markets.