This study investigates the influence of Environmental, Social, and Governance (ESG) information, as non-financial data, on corporate valuation processes, which have traditionally been dependent primarily on accounting number. In the context of corporate valuation, this research hypothesizes that the incorporation of non-financial information, such as ESG metrics, can ameliorate inaccuracies stemming from an exclusive reliance on financial data. Specifically, it examines whether ESG information can reduce the market's under-reaction to accounting information. Empirical results indicate that firms disclosing ESG information demonstrate a mitigated under-reaction to accounting figures, with this phenomenon being notably more distinct in firms with higher ESG ratings. Such findings remain robust in the context of financial analysts' forecasting errors of stock price and persist under the application of alternative proxies for accounting information and the adjustment for endogeneity via Propensity Score Matching (PSM). Overall, this research contributes significantly to the literature by underscoring and empirically substantiating the escalating relevance of ESG data as a crucial non-financial element in the assessment of corporate value.