AbstractThis study aims to examine the relationship between sufficiency economy philosophy (SEP) performance and the firm performance of Thai listed companies from 2013 to 2018 by using a novel measurement of SEP performance based on global reporting initiative guidelines. The higher SEP scores imply the firm is engaging more in SEP activities. Our empirical evidence shows support of our hypothesis, suggesting that SEP practice enhances firm accounting performance. Furthermore, several robustness checks confirm the results, including an instrumental variable analysis and propensity score matching technique.