Affiliated Managers Group on Tuesday filed a registration with the Securities and Exchange Commission for an initial public offering of common stock.

Boston-based Affiliated is a holding company that buys minority stakes in asset management firms. It has about $41 billion in assets under management. Its owners include NationsBank Corp., ITT Hartford, and TA Associates, a venture capital firm in Boston.

The offering is expected to be completed in the fourth quarter, according to a company statement. The underwriters will include lead manager Goldman, Sachs & Co. as well as Alex. Brown & Sons and Merrill Lynch & Co.

Affiliated has an ownership stake in 10 asset management firms. Last month Affiliated made agreements to take significant minority ownership positions in Geocapital, a New York investment firm that manages $2 billion, and in Tweedy, Browne Co., another New York firm that manages $5 billion for institutions and wealthy individuals.

William J. Nutt, Affiliated's president, declined to say how many shares will be sold or how much money the offering will raise.

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