X0303 4 2010-04-15 1 0001335249 HIGHBURY FINANCIAL INC HBRF 0001347653 Cameron R Bruce 535 MADISON AVENUE, 19TH FLOOR NEW YORK NY 10022 1 1 0 0 Chairman Common Stock 2010-04-15 4 D 0 1223751 D 0 D Common Stock 2010-04-15 4 D 0 1001250 D 0 I By Broad Hollow LLC Disposed of pursuant to the Agreement and Plan of Merger, dated as of December 12, 2009, between Highbury Financial Inc. ("Highbury"), Affiliated Managers Group, Inc. ("AMG") and its wholly-owned subsidiary, Manor LLC, whereby each share of Highbury common stock was converted into the right to receive 0.075951794 share of AMG common stock, plus cash in lieu of any fractional shares. As Managing Member of Broad Hollow LLC, the reporting person disclaims all beneficial ownership in such securities, except to the extent that the reporting person has a pecuniary interest in such securities. /s/ R. Bruce Cameron 2010-04-15