Affiliated Managers Group Inc., an investment management holding company launched in 1993 by former Boston Co. president William J. Nutt, has wooed two more companies to its fold.

The Boston-based company said Wednesday it has a definitive agreement to take a significant minority stake in GeoCapital, a New York investment firm that manages $2 billion, mostly in small-capitalization companies. Neither the terms nor the expected closing date were disclosed.

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