Initial Public Offerings (IPO) have been the subject of studies in many countries due to its importance, mainly in developed markets. Especially in Brazil, it is still a new topic, as the number of operations has grown over the last years. This research intends to evaluate these operations, using the Relative Valuation Methodology, to verify if the companies were overpriced or underpriced. Following that, the Cost of Equity for these companies was estimated, based on the information available at the time of the offer and then compared to the return observed after the shares issue. Besides that, the beta was estimated based on the average for each industry, and then compared to the actual observed on the following months, aiming at testing the accuracy of the estimate used in the Cost of Capital calculation. This research was based on a previous study, undertaken by Felipe Casotti (2007), which analyzed the operations between 2004 and 2006, with the added benefit of now having a larger sample and a longer record of actual data, enabling more robust analyses and more conclusive results. It is possible to observe that the price of IPOs were not overestimated, as despite the high upsides in the short term, the returns in the long run performed below market average and were very close to the estimated Cost of Capital.