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TSX Group And International Securities Exchange Complete Shareholders Agreement For DEX, Their New Canadian Derivatives Venture

Date 14/08/2007

TSX Group Inc. and International Securities Exchange Holdings, Inc. (ISE) today announced the completion of a shareholders agreement for CDEX Inc. (CDEX), which will operate DEX, a new derivatives exchange scheduled to begin operation in March 2009. CDEX will initially be owned 52% by TSX Group and 48% by ISE Ventures LLC, a wholly owned subsidiary of ISE, and will list and trade options, futures and options on futures on a range of Canadian securities. The launch of DEX will benefit the Canadian marketplace by bringing innovative derivative products and expanding the available trading alternatives.

Completion of the shareholders agreement is a significant milestone because it triggers funding by TSX and ISE of the monies needed to establish DEX and execute its initial business plan. The cost of setting up DEX is expected to be approximately $26 million Canadian and will be split between TSX and ISE according to their share ownership in the new venture.

CDEX has been incorporated under the Canada Business Corporations Act and will initially have a seven member Board of Directors, comprised of four TSX and three ISE representatives.

About TSX Group Inc. (TSX-X)
TSX Group operates Canada's two national stock exchanges, Toronto Stock Exchange serving the senior equity market and TSX Venture Exchange serving the public venture equity market, Natural Gas Exchange (NGX), a leading North American exchange for the trading and clearing of natural gas and electricity contracts and Shorcan Brokers Limited, the country's first fixed income interdealer broker. TSX Group also owns The Equicom Group Inc., a leading provider of investor relations and related corporate communication services in Canada. TSX Group is headquartered in Toronto and maintains offices in Montreal, Winnipeg, Calgary and Vancouver.

About ISE (NYSE:ISE)
International Securities Exchange Holdings, Inc. (NYSE: ISE), through its subsidiaries, operates a family of innovative securities markets. Founded on the principle that technology and competition create better, more efficient markets for investors, ISE consists of an options exchange, a stock exchange, an alternative markets platform and a market data business. ISE continually enhances its trading systems and develops new products to provide investors with the best marketplace and investment tools to trade smarter.
For more information about ISE, visit www.ise.com.