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The purpose of this paper is to test if building reputation capital through environmental, social and governance (ESG) investing can mitigate the negative effect of economic policy uncertainty (EPU) on firms’ valuation.

This study uses an unbalanced panel of 591 financial firms between 2005 and 2021 from Canada, France, Germany, Italy, Japan, the United Kingdom (UK) and the USA. Ordinary least square method is used in the empirical tests. To alleviate a potential endogeneity problem, robustness tests are performed using the two-stage least square approach with instrumental variables.

The results of this paper show that sustainable reporting can offset the negative effect of EPU on the valuation of financial firms. Consistent with the stakeholder-based reputation-building hypothesis, sustainability performance may have an insurance-like impact on firms’ valuation during periods of high uncertainty.

According to the findings, during high policy uncertainty periods, investors accept to pay a premium for the stocks of the firms which built social capital through environmental and social investments. Accordingly, it is suggested that regulatory bodies and governments motivate firms to increase their stakeholder orientation to attain higher reputation capital.

Managers can mitigate the negative impact of policy uncertainty on the value of their firms via building social capital, which will increase financial market stability in return, and portfolio investors may use such firms for portfolio optimization decisions.

To the best of the authors’ knowledge, this paper is one of the first to examine the mitigating role of ESG investing on EPU and firm valuation relationships for financial firms. Thus, this study provides new insights related to the impact of ESG performance on valuation during uncertain times.