This paper investigates the evolution of stock price synchronicity following the commencement of trading using a comprehensive data set of IPO companies. Specifically, we examine how stock price synchronicity, defined as the portion of a firm’s stock return variation explained by market and industry returns to firm-specific information, evolves over the first six years of being public. Our analysis indicates some interesting results. First, we find a U-shape curve of stock price synchronicity as companies go through their first few years of being publicly traded. Second, this shape is affected by the activities of analysts, insiders, and institutional investors. Third, we find a negative effect of analyst coverage, a positive effect of insider trading activities, a positive effect of institutional investor activities, and a negative effect of the number of institutional investors on the level of firm specific return variation. Taken all together our findings suggest that analysts are adding more industry and market level information while insiders and institutional investors to a lesser extent, convey more firm specific information to the market participants.