This study aimed to analyze the factors that affect the disclosure of Islamic Social Reporting (ISR) on Sharia-compliant companies listed on the Jakarta Islamic Index (JII) 2013-2014. ISR is an index of social responsibility disclosure that the indicator is in line with the principles of Islam. JII is one of the investment guide for Islamic mutual funds to put funds for Muslim investors to invest in securities of sharia. By using JII as the sample companies, this study aims to identify factors that affect the level of disclosure of ISR. Variables used in this research is company size, profitability, and the life of the company. The data used in this study in the form of an annual report for each company obtained through the Indonesia Stock Exchange and the hypothesis was tested using multiple linear regression. These results indicate that profitability has a significant positive effect on the level of disclosure of ISR. However, firm size and age of the company does not have a significant effect on the level of disclosure of ISR. 
Keywords: Islamic Social Reporting, Jakarta Islamic Index, company size, profitability, company age