<![CDATA[Introduction: This study examines the effect of financial performance, proxied by Return on Assets (ROA), on Sustainability Report disclosure among companies listed in the ESG Star Index. Increasing concerns regarding sustainable business practices have encouraged companies to disclose economic, social, and environmental information as a form of accountability to stakeholders. Financial performance is considered an important factor influencing the extent of sustainability disclosure because companies with higher profitability tend to have greater resources to support sustainability activities. Methods: This research employed a quantitative approach using secondary data obtained from annual reports and sustainability reports published by companies included in the ESG Star Listed Companies. The sample was selected using a purposive sampling technique based on predetermined criteria. Data were analyzed using descriptive statistics, classical assumption tests, simple linear regression analysis, partial t-test, and coefficient of determination analysis with the assistance of IBM SPSS Statistics software.Results: The findings reveal that financial performance, proxied by ROA, has a positive and significant effect on Sustainability Report disclosure, as indicated by a significance value of 0.000, which is lower than the significance level of 0.05. These results suggest that companies with higher profitability tend to disclose sustainability information more extensively. The study concludes that strong financial performance encourages greater transparency in sustainability practices and positively contributes to the extent of Sustainability Report disclosure. Companies should continuously improve financial performance while enhancing the quality and extent of Sustainability Report disclosure to strengthen stakeholder trust and support long-term business sustainability. Keywords: Financial Performance, Sustainability Report Disclosure]]>
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