This paper investigates the relationship between sustainability reporting and financial performance. The motive of this study is from the doubt of whether companies should participate in costly sustainable practices. Firms issuing sustainability report is a recent trend over the last twenty years. Companies could improve their sustainability performance by reporting on environmental, social and public related issues. The key driver for picking for the quality of sustainability reporting is the guideline of the Global Reporting Initiative (GRI). I find a positive and significant relationship between firms` financial performance and GRI sustainability reporting using a sample of 1647 world-wide organizations from 1999 to 2012. The finding also robusts to alternative model specifications and additional tests providing contribution to the related literature of corporate social performance (CSP) and corporate financial performance (CFP).