This research aims to examine the impact of Internet Financial Reporting (IFR) practice on companies’ market value in Indonesian Manufacturing companies listed in Indonesian Stock Exchange between the year 2015 and 2016. This research examines how information available on companies’ websites affect firm’s market value based on efficient market hypotheses, agency theory, and signaling theory. Using 79 firms as research sample, this research found an empirical evidence that IFR practices have strong positive relationship on market values over the period of research. Overall, the results indicate that investors value IFR information as a source for making equity pricing decisions. The result has implication for both national regulators and entities about the importance of information openness.