Pzena Investment Management Inc. said on Monday it plans to sell about 6.4 million Class A common shares in a planned initial public offering.

The New York-based investment management firm, in an amended offering document filed with the U.S. Securities and Exchange Commission, did not estimate the price of those shares.

Underwriters, led by Goldman Sachs & Co. and UBS Investment Bank, will have the option to buy another 960,568 shares if there is heavy demand for the IPO, the company said.