EXHIBIT 21.1 LIST OF SUBSIDIARIES (in alphabetical order) WHOLLY OWNED SUBSIDIARIES OF THE REGISTRANT AMG/Midwest Holdings, Inc., a Delaware corporation AMG/Midwest Holdings, LLC, a Delaware limited liability company (through AMG/Midwest Holdings, Inc. and AMG Service Corp.) AMG New York Holdings Corp., a Delaware corporation AMG Properties LLC, a Delaware limited liability company AMG/SouthwestGP Holdings, Inc., a Delaware corporation AMG/TBC Holdings, Inc., a Delaware corporation AMG Service Corp., a Delaware corporation AMG Finance Trust, a Massachusetts business trust (through AMG Service Corp.) The Burridge Group Inc., an Illinois corporation E.C. Rorer II, Inc., a Delaware corporation (through Edward C. Rorer & Co., Inc.) E.C. Rorer, L.P., a Delaware limited partnership (through E. C. Rorer II, Inc. and Edward C. Rorer & Co., Inc.) Edward C. Rorer & Co., Inc., a Delaware corporation FCMC Holdings, Inc., a Delaware corporation First Quadrant Corp., a New Jersey corporation (through First Quadrant Holdings, Inc.) First Quadrant Holdings, Inc., a Delaware corporation GeoCapital Corporation, a Delaware corporation J M H Management Corporation, a Delaware corporation Prides Crossing Holdings LLC, a Delaware limited liability company Suite 3000 Holdings, Inc., a Delaware corporation TMF Corp., a Delaware corporation ENTITIES IN WHICH THE REGISTRANT HAS A MAJORITY INTEREST (DIRECT AND INDIRECT) Davis Hamilton Jackson & Associates, L.P., a Delaware limited partnership (through AMG/SouthwestGP Holdings, Inc. and AMG/TBC Holdings, Inc.) Essex Investment Management Company, LLC, a Delaware limited liability company First Quadrant, L.P., a Delaware limited partnership (through First Quadrant Corp.) First Quadrant U.K., L.P., a Delaware limited partnership (through First Quadrant Corp.) First Quadrant Limited, a U.K. corporation (through First Quadrant U.K., L.P.) Frontier Capital Management Company, LLC, a Delaware limited liability company (through FCMC Holdings, Inc.) GeoCapital, LLC, a Delaware limited liability company (through GeoCapital Corporation) LIST OF SUBSIDIARIES (CONTINUED) (in alphabetical order) Gofen and Glossberg, L.L.C., a Delaware limited liability company Joint Venture Partners LLC, a Delaware limited liability company (through AMG Properties LLC) J.M. Hartwell Limited Partnership, a Delaware limited partnership (through J M H Management Corporation and AMG New York Holdings Corp.) Managers Distributors, Inc., a Delaware corporation (through The Managers Funds LLC) The Managers Funds LLC, a Delaware limited liability company (through TMF Corp.) Renaissance Investment Management, a Delaware partnership Rorer Asset Management, LLC, a Delaware limited liability company (through E.C. Rorer, L.P.) Skyline Asset Management, L.P., a Delaware limited partnership Systematic Financial Management, L.P., a Delaware limited partnership The Burridge Group LLC, a Delaware limited liability company (through The Burridge Group Inc.) Tweedy, Browne Company LLC, a Delaware limited liability company (through AMG/TBC Holdings, Inc.) ENTITIES IN WHICH THE REGISTRANT HAS A MINORITY INTEREST Paradigm Asset Management Company, L.L.C., a Delaware limited liability company (through AMG New York Holdings Corp.)