Environmental, Social, and Governance (ESG) disclosures are pivotal in steering listed companies toward a balanced trajectory of economic efficiency and environmental/social accountability. Disclosure of ESG information can enhance consumer confidence, create shareholder value, and promote sustainable corporate development. Based on the ESG information disclosure data of Chinese listed companies, this study investigates and empirically analyzes the frequency, content, and quality of ESG information disclosure by Chinese listed companies using a mixed-methodological research approach combining qualitative and quantitative approaches. The findings indicate a low and unreliable frequency of ESG disclosure among Chinese listed companies, with a predominant focus on descriptive content primarily in the “E” and “G” dimensions, while neglecting information disclosure in the “S” dimension. The results of subgroup analyses show that industry classification and the regional economic development level do not increase the disclosure rate. Although the nature of ownership, industry classification, and the level of regional economic development can contribute to improving the overall quality of disclosure, there are differences in the “E”, “S”, and “G” dimensions. In addition, mandatory disclosure requirements can improve disclosure quality, but some differences in the “G” dimension are not significant. The findings provide empirical support for improving the ESG disclosure performance of Chinese listed companies to achieve the “dual-carbon” goal.