The article evaluates the role of mutual funds as shareholders in companies listed on the Warsaw Stock Exchange as of the end of 2006, 2008 and 2010. The authors examine the involvement of mutual funds in the stock of publicly traded companies as well as the position of these funds compared to that of the largest shareholders. The authors also investigate the characteristic features of publicly traded companies whose shares are part of mutual fund portfolios. These companies are analyzed taking into account the status of the leading shareholder and various aspects of company operations such as human resources policy, business performance and changes to the ownership structure. The authors conclude that that mutual funds play a limited role in corporate governance processes in publicly traded companies in Poland. This is primarily due to the relatively low financial involvement of the funds. Companies whose shareholders include mutual funds usually meet higher standards in terms of corporate governance than other businesses. This may stem from the fact that mutual funds are capable of selecting better companies for their portfolios than other shareholders, Adamska and Urbanek say.