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NEW YORK, July 1, 2008 – The New York Stock Exchange, a subsidiary of NYSE Euronext(NYX), today will introduce NYSE Order Imbalances, a rich, new data product that will increase the transparency of the daily open and close of the NYSE, the two most critical periods of the trading day.

“The auctions that take place at the open and close of the New York Stock Exchange are unmatched for their liquidity and price discovery.  Now we are providing investors with greater visibility into that auction process, helping customers make better-informed decisions and more effectively manage their execution strategies,” said Mark Schaedel, vice president, NYSE Data Products.  “We believe the end result will be increased participation in the open and close, which in turn further contributes to market quality.”

Stream of Rich Information at Critical Times of the Trading Day

NYSE Order Imbalances will include the following information: time (in milliseconds); symbol; side of the imbalance (buy/sell); paired quantity; imbalance quantity; and reference price (last sale).

Opening imbalances will be disseminated every 5 minutes between 8:30-9 a.m. ; every minute between 9-9:20 a.m. ; and every 15 seconds between 9:20 and the open (or 9:35 , whichever comes first).  Closing imbalances will be disseminated every 15 seconds between 3:40-3:50 p.m. and every 5 seconds between 3:50 p.m. and the close.

The new NYSE Order Imbalances product will be provided free of charge to NYSE OpenBook customers.  It follows the June 20 introduction of NYSE OpenBook Ultra, which provides a  low-latency, event-driven look at the NYSE limit-order book as well as rich content and functionality; and the June 24 launch of NYSE Realtime Stock Prices, which enables information providers to offer NYSE prices in real time and free of charge to unlimited public investors. 

For additional information:
NYSE Order Imbalances Page: http://www.nyxdata.com/nysedata/default.aspx?tabid=715

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About NYSE Euronext
NYSE Euronext (NYX) operates the world’s leading and most liquid exchange group, and seeks to provide the highest levels of quality, customer choice and innovation.  Its family of exchanges, located in six countries, includes the New York Stock Exchange, the world's largest cash equities market; Euronext, the Eurozone's largest cash equities market; Liffe, Europe's leading derivatives exchange by value of trading; and NYSE Arca Options, one of the fastest growing U.S. options trading platforms.  NYSE Euronext offers a diverse array of financial products and services for issuers, investors and financial institutions in cash equities, options and derivatives, ETFs, bonds, market data, and commercial technology solutions.  NYSE Euronext's nearly 4,000 listed companies represent a combined $28.5 / 18.4€ trillion (as of May 31, 2008) in total global market capitalization, more than four times that of any other exchange group.  NYSE Euronext's equity exchanges transact an average daily trading value of approximately 157.5 /103.4 billion (as of May 31, 2008 ), which represents more than one-third of the world's cash equities trading.  NYSE Euronext is part of the S&P 500 index and the only exchange operator in the S&P 100 index.  For more information, please visit www.nyx.com.

Cautionary Note Regarding Forward-Looking Statements
This press release may contain forward-looking statements, including forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995. Such forward-looking statements include, but are not limited to, statements concerning NYSE Euronext’s plans, objectives, expectations and intentions and other statements that are not historical or current facts. Forward-looking statements are based on NYSE Euronext’s current expectations and involve risks and uncertainties that could cause actual results to differ materially from those expressed or implied in such forward-looking statements. Factors that could cause NYSE Euronext’s results to differ materially from current expectations include, but are not limited to: NYSE Euronext’s ability to implement its strategic initiatives, economic, political and market conditions and fluctuations, government and industry regulation, interest rate risk and U.S. and global competition, and other factors detailed in NYSE Euronext’s reference document for 2007 (“document de référence”) filed with the French Autorité des Marchés Financiers (Registered on May 15, 2008 under No. R. 08-054), 2007 Annual Report on Form 10-K and other periodic reports filed with the U.S. Securities and Exchange Commission or the French Autorité des Marchés Financiers. In addition, these statements are based on a number of assumptions that are subject to change. Accordingly, actual results may be materially higher or lower than those projected. The inclusion of such projections herein should not be regarded as a representation by NYSE Euronext that the projections will prove to be correct. This press release speaks only as of this date. NYSE Euronext disclaims any duty to update the information herein.