TSX Datalinx and Transaction Network Services Announce Managed Network Provider Arrangement; TNS' Secure Trading Extranet Allows TSX Equity Exchanges to Expand Visibility of Market Data Globally.

NEW YORK & TORONTO -- Transaction Network Services (TNS), Inc. (NYSE:TNS), a premier network and data communications provider for transaction-oriented applications and TSX Datalinx, the market data operation of TSX Group Inc. (TSX:X), today announced a relationship in which TNS will serve as one of TSX's managed network providers. Under the terms of the agreement, the TNS network will deliver Toronto Stock Exchange and TSX Venture Exchange Canadian market data to destinations around the world.

The addition of the equity exchanges of TSX Group marks eight North American exchanges to take advantage of TNS' superior network capability. In addition to TSX Group, TNS also serves as a managed network provider to other North American Stock Exchanges.

"Market data continues to be a critical part of the electronic trade process," said Alan Schwartz, executive vice president and general manager of TNS' Financial Services Division. "This agreement is a tremendous opportunity for TNS to support TSX's efforts. Based on our experience, technological expertise and reliable far-reaching network, TSX has entrusted TNS with this critical business function."

TNS' network capabilities focus on providing rapid and secure service that supports the flow of financial information and transactions among global communities of interest. Its secure IP network enables financial institutions to safely and quickly exchange transaction-oriented data using industry standard IP protocols. In addition, TNS provides exchanges and their trading partners with increased visibility, reliability and redundancy, key issues in the increasingly mission critical status of market data.

"At TSX Group, we continue to look for ways to expand the access options and visibility of trading information on our marketplaces," said Eric Sinclair, Senior Vice President of TSX Datalinx, the market data operation of TSX Group Inc. "The drive to provide faster, more powerful, reliable networks capable of distributing mission critical data is a challenge being faced by all leading international exchanges." He added, "TNS' network allows us to enhance the visibility and reach of our market data to clients around the world."

TNS' Financial Service Division (FSD) offers a secure, private network, which enables the movement of market data, IP voice services (ARDs, MRDs and Hoot and Hollers) and instantaneous trade transactions without the potential latency and security risks associated with Internet based trading applications.

About Transaction Network Services, Inc.

Transaction Network Services is one of the leading providers of business-critical, cost-effective data communications services for transaction-oriented applications. TNS provides rapid, reliable and secure transaction delivery platforms that enable transaction authorization and processing across several vertical markets and trading communities.

Since its inception in 1990, TNS has designed and implemented multiple data networks, each designed specifically for the transport of transaction-oriented data. TNS' networks support a variety of widely accepted communications protocols and are designed to be scalable and accessible by multiple methods. TNS' network technologies have been deployed in the United States and internationally, and TNS' networks have become preferred networks servicing the trading community, wireless and wireline carriers, and the card processing and dial-up automated teller machine markets. For further information about TNS' transaction solutions, please refer to www.tnsi.com.

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 as well as Natural Gas Exchange (NGX), a leading North American exchange for the trading and clearing of natural gas and electricity contracts. TSX are the initials attached to the core equity operations of TSX Group (www.tsx.com): Toronto Stock Exchange, TSX Venture Exchange, TSX Markets, TSX Datalinx, TSX Technologies. TSX Group is headquartered in Toronto and maintains offices in Montreal, Winnipeg, Calgary and Vancouver.