Abstract: It has been long years that the operation of preliminary general stock supplies has attracted the attention of researches and financial thinkers. According to the definition of efficient investment markets, stock price at any time is the reflect of stock’s intrinsic value considering existing and related information in market. Preliminary stock supply occurs when a company’s stock are sold to public for the first time, in fact initial stock release is one of the most important event during company’s life time and provides a lot of advantages for primary constituents and investors of the company. For the initial stock release, new resources are supplied which is vital for company’s growth; therefore, many companies demand ownership extension through the increase and variety of the investors. In this research, we are looking for whether the conservative behavior of securities publishers (stocks) can impact on the operation of new companies to the stock market or not. According to the results obtained, research hypothesis were verified.