AMG Files Shelf Registration Statement Related to April 2006 Financing.

BOSTON -- Affiliated Managers Group, Inc. (NYSE: AMG) announced that it has filed with the Securities and Exchange Commission a shelf registration statement on Form S-3 registering its convertible trust preferred securities for resale by investors. AMG's issuance of the securities, which raised approximately $300 million in proceeds, was completed on April 3, 2006. The registration statement was automatically effective upon filing.

AMG is an asset management company that acquires and holds majority equity investments in a diverse group of mid-sized investment management firms. AMG's affiliated investment management firms managed approximately $203 billion in assets as of March 31, 2006.

Certain matters discussed in this press release may constitute forward-looking statements within the meaning of the federal securities laws. Actual results and the timing of certain events could differ materially from those projected in or contemplated by the forward-looking statements due to a number of factors, including changes in the securities or financial markets or in general economic conditions, the availability of equity and debt financing, competition for acquisitions of interests in investment management firms, the ability to complete pending acquisitions, the investment performance of our Affiliates and their ability to effectively market their investment strategies, and other risks detailed from time to time in AMG's filings with the Securities and Exchange Commission. Reference is hereby made to the "Cautionary Statements" set forth in the Company's Form 10-K for the year ended December 31, 2005.

For more information on Affiliated Managers Group, Inc., please visit AMG's Web site at www.amg.com.