TSX group

August 5, 2008

August 5, 2008 (TORONTO) -- TSX Datalinx, the market data division of TMX Group Inc., today unveiled the Insider Trade Marker Report. This product provides a daily summary of insider (including significant shareholders) buying and selling activities on Toronto Stock Exchange and TSX Venture Exchange. This information is based on a trade "marker" provided by brokers at the time a company insider either buys or sells a security.

"We are the first North American exchange to offer this product," said Eric Sinclair, Senior Vice-President, TSX Datalinx. "We see this product as a catalyst to good corporate governance by providing investors with greater transparency with access to this information through our many distribution channels, including TMXmoney.com"

This product provides broad dissemination of this information for the first time. It could be seen as a unique market look – providing information that could influence trading decisions or act as a warning sign to investors.

The product will also substantially speed up the timeliness of insider trading information. Currently Canadian insider trading information is available up to 10 calendar days after the transaction, as trades are reported through the System for Electronic Disclosure by Insiders (SEDI).

For more information please visit the "Featured Product" section on the homepage of www.tsx.com.

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 products. Toronto Stock Exchange (TSX), TSX Venture Exchange, Montreal Exchange (MX), Natural Gas Exchange (NGX), Shorcan and other TMX Group companies provide trading markets, clearing facilities, data products and other services to the global financial community who access Canada's capital market. From its home base in Canada TMX Group reaches internationally, as its equity markets are the 7th largest in the world by market capitalization and list more resource companies than any other exchange group. TMX Group is headquartered in Toronto and maintains offices in Montreal, Calgary and Vancouver. For more information on TMX Group, visit our website at http://www.tsx.com.

For more information please contact:
Jean-Charles Robillard
Director, Corporate Communications
TMX Group
416-947-4682
JCRobillard@m-x.ca