National Stock Exchange Selects Transaction Network Services for Enhanced Trading Technology.

TNS' Secure Trading Extranet Allows NSX to Expand Reach; Power Trading with Increased Speed and Security

NEW YORK -- Transaction Network Services, Inc. (NYSE:TNS), a leading provider of business-critical network and data communications services for transaction-oriented applications, announced that it has been chosen as a preferred technology provider by the National Stock Exchange[R] (NSX(SM)), the nation's first all-electronic stock exchange, to provide connectivity, access to market data and secure direct link to the global TNS extranet for NSX's new technology platform, NSX BLADE(SM).

"Trading information and secure, reliable connectivity are integral elements of the electronic trading process," said Alan Schwartz, Executive Vice President and General Manager of TNS' Financial Services Division. "NSX has been a pioneer in electronic trading and this agreement further validates the quality of the TNS network. Leading the market in low latency and high security, TNS connects over 1,000 endpoints to ensure fast transactions with over 450 buy and sell-side institutions, market data and software vendors, exchanges and alternative trading venues. We are delighted to have been chosen and to include NSX among our global client list of leading exchanges, banking and financial institutions."

"Our new, state-of-the-art technology platform, NSX BLADE, was built from the ground up to provide the securities industry with a high-tech, low-cost market center alternative to meet today's speed, price and service needs," said Joseph Rizzello, CEO of NSX. "We launched NSX BLADE on October 23, with the added confidence in the reliability and expertise that TNS brings to the table."

TNS' network capabilities focus on providing a rapid and secure service that supports the flow of financial information and transactions among global communities of interest. The 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 the key elements of increased visibility, reliability and redundancy.

TNS' Financial Service Division (FSD) currently provides secure voice and data solutions to over 450 leading financial trading, banking and exchange clients around the world. TNS technology 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 to 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 National Stock Exchange, Inc.

NSX, the nation's first all electronic stock exchange, is the low-cost provider of exchange services. Having replaced its physical trading floor with a completely automated market in 1980, NSX has been a model of exchange efficiency and a driving force for change in the world of securities exchanges. Founded in 1885, NSX continues to lead the way in exchange innovation. For more information, visit NSX's website at www.nsx.com.

The statements and information contained in this press release that are not descriptions of historical fact may contain forward-looking statements. Forward-looking statements involve a number of risks, uncertainties or other factors beyond TNS' control, which could cause actual results to differ materially from historical results or performance and from any opinions or statements expressed with respect to future periods. TNS disclaims any obligation to update or correct any forward-looking statements made herein due to the occurrence of events after the issuance of this press release.