Hellman & Friedman agreed to acquire a minority stake in money manager Artisan Partners, said Andrew Ziegler, Artisan CEO. Mr. Ziegler declined to disclose the specific terms of the deal, but said none of Artisan's principals will relinquish more than 30% of his or her individual ownership stakes. Hellman & Friedman acquire the stake using capital from one of its private equity funds, he said . Hellman & Friedman's principals individually provided capital to help launch Artisan in 1995. Matthew Barger, managing director and senior advisor at Hellman & Friedman, was not immediately available for comment.