QuickLinks -- Click here to rapidly navigate through this document
Exhibit 21.1
SCHEDULE OF SUBSIDIARIES
(in alphabetical order)
WHOLLY OWNED SUBSIDIARIES OF THE REGISTRANT
AMG Canada Corp., a Nova Scotia corporation
AMG Capital Corp., a Delaware corporation
AMG/FAMI Investment Corp., a Nova Scotia corporation
AMG Genesis LLC, a Delaware limited liability company
AMG/Midwest Holdings, Inc., a Delaware corporation
AMG/Midwest Holdings, LLC, a Delaware limited liability company
AMG New York Holdings Corp., a Delaware corporation
AMG/North America Holding 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 Northeast Investment Corp., a Delaware corporation
AMG Northeast Holdings, Inc., a Delaware corporation
B&D Labour Consultants Inc., an Ontario corporation
CEFLP Inc., an Ontario corporation
Cinegate Financial Services Inc., an Ontario corporation
Covington Capital Corporation., a Nova Scotia corporation
Covington Life Sciences Corporation, an Ontario corporation
Covington Marketing Group Inc., an Ontario corporation
E.C. Rorer Partnership, a Delaware general partnership
El-Train Acquisition LLC, a Delaware limited liability company
FA (DE) Acquisition Company, LLC, a Delaware limited liability company
FA (WY) Acquisition Company, Inc., a Delaware corporation
FCMC Holdings, Inc., a Delaware corporation
First Asset Advisory Services Inc., an Ontario corporation
First Asset Capital Management (III) Inc., an Ontario corporation
First Asset Funds, Inc., a Canada corporation
First Asset Investment Management Inc., an Ontario corporation
First Asset Power Funds Inc., an Ontario corporation
First Asset Power Funds II Inc., an Ontario corporation
1
First Asset Resources Inc., an Ontario corporation
First Quadrant Corp., a New Jersey corporation
First Quadrant Holdings, LLC, a Delaware limited liability company
Frontier Capital Management Incentive LLC, a Delaware limited liability company
Gofen and Glossberg Incentive LLC, a Delaware limited liability company
J M H Management Corporation, a Delaware corporation
NGB Management Inc., an Ontario corporation
New Millennium Venture Partners Inc., an Ontario corporation
Prides Crossing Holdings LLC, a Delaware limited liability company
Quartet Capital Corporation, an Ontario corporation
Suite 3000 Holdings, Inc., a Delaware corporation
TimesSquare Manager Member LLC, a Delaware limited liability company
TMF Corp., a Delaware corporation
Topspin Acquisition, LLC, a Delaware limited liability company
Triax Capital Corporation., a Nova Scotia corporation
Welch & Forbes, Inc. a Massachusetts corporation
1455486 Ontario Inc., an Ontario corporation
1588153 Ontario Limited, an Ontario corporation
9106-6001 Quebec Inc., a Quebec corporation
ENTITIES IN WHICH THE REGISTRANT HAS A MAJORITY INTEREST (DIRECT AND INDIRECT)
Advantage Outsourcing Solutions, LLC, a Delaware limited liability company
Bowling Portfolio Management LLC, a Delaware limited liability company
The Burridge Group LLC, a Delaware limited liability company
Davis Hamilton Jackson & Associates, L.P., a Delaware limited partnership
Deans Knight Capital Management Ltd., a Canadian corporation
Essex Investment Management Company, LLC, a Delaware limited liability company
First Quadrant, L.P., a Delaware limited partnership
First Quadrant U.K., L.P., a Delaware limited partnership
Foyston Gordon & Payne Inc., a Canadian corporation
Friess Associates, LLC, a Delaware limited liability company
Friess Associates of Delaware, LLC, a Delaware limited liability company
Frontier Capital Management Company, LLC, a Delaware limited liability company
Genesis Fund Managers LLP, a Delaware limited liability partnership
Genesis Asset Managers, LLP, a Delaware limited liability partnership
2
Genesis Investment Management, LLP, a U.K. limited liability partnership
GeoCapital, LLC, a Delaware limited liability company
Gestion Aequilibrium Inc., a Quebec corporation
Gofen and Glossberg, L.L.C., a Delaware limited liability company
J.M. Hartwell Limited Partnership, a Delaware limited partnership
Managers Distributors, Inc., a Delaware corporation
Managers Investment Group LLC, a Delaware limited liability company
MAS Fixed Income LLC, a Delaware limited liability company
MBI Acquisition Corp., a Canadian corporation
M.J. Whitman LLC, a Delaware limited liability company
M.J. Whitman Global Advisors LLC, a Delaware limited liability company
Montrusco Bolton, Inc., a Canadian corporation
Montrusco Bolton Investments Inc., a Canadian corporation
Montrusco Capital Management Inc., a Canadian corporation
New GAML Holdco, Ltd., a Cayman Islands company
New Millennium Venture Partners Inc., an Ontario corporation
Private Debt LLC, a Delaware limited liability company
The Renaissance Group LLC, a Delaware limited liability company
Rorer Asset Management, LLC, a Delaware limited liability company
Skyline Asset Management, L.P., a Delaware limited partnership
Systematic Financial Management, L.P., a Delaware limited partnership
Third Avenue Holdings Delaware LLC, a Delaware limited liability company
Third Avenue Management LLC, a Delaware limited liability company
TimesSquare Capital Management, LLC, a Delaware limited liability company
Tweedy, Browne Company LLC, a Delaware limited liability company
Welch & Forbes LLC, a Delaware limited liability company
333 Global Advisers LLC, a Delaware limited liability company
ENTITIES IN WHICH THE REGISTRANT HAS A MINORITY INTEREST
AQR Capital Management, LLC, a Delaware limited liability company
AQR Capital Management II, LLC, a Delaware limited liability company
AQR Capital Management Holdings, LLC, a Delaware limited liability company
Beutel, Goodman & Company Ltd., an Ontario corporation
Cinegate Production Management Services 2001 Inc., a Canadian corporation
3
DFD Select Group Limited, a Guernsey company
DFD Select Group, LLC, a New York limited liability company
DFD Select Group, S.A.R.L., a Paris, France company
DFD Select Group Management (Ireland) Limited, an Ireland corporation
FIAMI Production Management Services 2001 Inc., a Canadian corporation
FQN Management, LLC, a Delaware limited liability company
Frontier Performance Advisers, L.P., a Delaware limited partnership
Louisbourg Investments Inc., a New Brunswick corporation
Montrusco Bolton Focus Global Fund Ltd., a Cayman Islands corporation
Red Mile Syndication Inc., an Ontario corporation
Wilshire Financial Services Inc., an Ontario corporation
4
QuickLinks
