TMXgroup

January 10 , 2012

January 10, 2012 (TORONTO) – TMX Group Inc. will release its financial results for the fourth quarter of 2011 on Wednesday, February 8, 2012.

A conference call to review the results will be held at 8 a.m. (ET).

Phone numbers for the live call are 647-427-7450 or 1-888-231-8191. An audio replay of the conference call will be available at 416-849-0833 or 1-855-859-2056, pass code 42191175.

The audio webcast of the conference call will also be available on TMX Group's website at www.tmx.com, under Investor Relations.

WHAT:
TMX Group Inc. Q4 2011 financial results

WHO:
Tom Kloet, CEO, TMX Group
Michael Ptasznik, CFO, TMX Group
Paul Malcolmson, Director, Investor Relations, TMX Group

WHEN:
Wednesday, February 8, 2012, 8 a.m. (ET)

HOW:
Phone numbers for the live call are: 647-427-7450 or 1-888-231-8191
Webcast at: www.tmx.com, under Investor Relations

About TMX Group (TSX-X)

TMX Group's key subsidiaries operate cash and derivative markets for multiple asset classes including equities, fixed income and energy. Toronto Stock Exchange, TSX Venture Exchange, TMX Select, Montreal Exchange, Canadian Derivatives Clearing Corporation, Natural Gas Exchange, Boston Options Exchange (BOX), Shorcan, Shorcan Energy Brokers, Equicom and other TMX Group companies provide listing markets, trading markets, clearing facilities, data products and other services to the global financial community. TMX Group is headquartered in Toronto and operates offices across Canada (Montreal, Calgary and Vancouver), in key U.S. markets (Houston, Boston and Chicago) as well as in London and Beijing. For more information about TMX Group, visit our website at www.tmx.com. Follow TMX Group on Twitter at http://twitter.com/tmxgroup.

For more information please contact:

Carolyn Quick
Director, Corporate Communications
TMX Group
416-947-4597
carolyn.quick@tmx.com

Paul Malcolmson
Director, Investor Relations TMX Group
416-947-4317
paul.malcolmson@tmx.com