TMX Group Inc. Normal Course Issuer Bid Approved

    TORONTO, Aug. 14 /CNW/ - TMX Group Inc. ("TMX Group") announced today
that a normal course issuer bid ("NCIB") has been accepted by Toronto Stock
Exchange ("TSX").
    TMX Group intends to purchase up to 7,595,585 of its common shares by way
of normal course purchases on Toronto Stock Exchange, representing 10% of the
public float on August 5, 2008. Daily repurchases will be limited to 117,890
common shares, other than block purchase exceptions.
    The purchases may commence on August 18, 2008 and will terminate on
August 17, 2009, or on such earlier date as TMX Group completes its purchases.
    Purchases will be made by TMX Group in accordance with TSX requirements
and the price which TMX Group will pay for any such common shares will be the
market price of such shares at the time of acquisition. All purchases will be
effected through the facilities of TSX or other Canadian marketplaces. TMX
Group may enter into one or more private agreements to purchase common shares,
provided that it first obtains an order from the relevant securities
regulatory authority to permit such agreements. All purchased common shares
will be cancelled.
    TMX Group intends to enter into a pre-defined plan with its designated
broker to allow for the repurchase of common shares at times when TMX Group
ordinarily would not be active in the market due to its own internal trading
blackout periods, insider trading rules or otherwise.
    TMX Group believes that the market price of its common shares could be
such that their purchase may be an attractive and appropriate use of corporate
funds in light of potential benefits to remaining shareholders. TMX Group has
purchased 6,841,051 common shares in the last 12 months under its previous
NCIB at a weighted average price per share of $42.79.
    To the knowledge of TMX Group, no director, senior officer or other
insider of TMX Group currently intends to sell any common shares under this
bid. However, sales by such persons through the facilities of TSX may occur if
the personal circumstances of any such person change or any such person makes
a decision unrelated to these normal course purchases. The benefits to any
such person whose shares are purchased would be the same as the benefits
available to all other holders whose shares are purchased.

    About TMX Group Inc. (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 seventh 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

For further information:

For further information: Jean-Charles Robillard, Corporate
Communications, TMX Group Inc., (416) 947-4682, Toll Free 1-888-873-8392,

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