TMX Group Limited declares dividend of $0.40 per common share

May 10, 2013 (TORONTO) – The Board of Directors of TMX Group Limited declared a dividend of $0.40 on each common share outstanding, payable on June 7, 2013 to shareholders of record at the close of business on May 24, 2013.

TMX Group hereby advises that this dividend is designated as an "eligible dividend" for
Canadian income tax purposes.

For the results of the quarter ended March 31, 2013 for TMX Group, please click on the
following link: http://www.tmx.com/en/investor_relations/index.html.

About TMX Group (TSX: X)

TMX Group's key subsidiaries operate cash and derivative markets and clearinghouses for multiple asset classes including equities, fixed income and energy. Toronto Stock Exchange, TSX Venture Exchange, TMX Select, Alpha Group, The Canadian Depository for Securities, Montreal Exchange, Canadian Derivatives Clearing Corporation, Natural Gas Exchange, BOX Options Exchange, Shorcan, Shorcan Energy Brokers, Equicom and other TMX Group companies provide listing markets, trading markets, clearing facilities, depository services, 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 (New York, Houston, Boston and Chicago) as well as in London, Beijing and Sydney. For more information about TMX Group, visit our website at http://www.tmx.com. Follow TMX Group on Twitter at https://twitter.com/tmxgroup.