NYSE Euronext Appoints Stephen Davidson Vice President, Investor Relations

NYSE Euronext (NYX), the world’s leading and most diverse exchange group, today announced the appointment of Stephen Davidson as Vice President, Investor Relations, effective October 6, 2008. Mr. Davidson will be responsible for the company’s global investor relations program which includes managing relationships and communications with shareholders, analysts and the professional investment community. Most recently, Mr. Davidson has served as head of Investor Relations and Global Marketing and Communications for MarketAxess, which provides client-to-dealer corporate bond trading and technology services.

"Stephen is an accomplished investor relations professional who has an excellent reputation for implementing progressive initiatives in investor outreach and communications,” said Michael S. Geltzeiler, Group Executive Vice President & Chief Financial Officer. "Stephen also possesses a deep understanding of the financial services industry and the global exchange space, having spent over 16 years in the industry. We look forward to Stephen joining the NYSE Euronext team.”

"As the world’s leading exchange group, NYSE Euronext is well positioned to grow and produce extraordinary value for customers and shareholders,” said Mr. Davidson. "I welcome the opportunity to join the NYSE Euronext team, overseeing the company’s global investor relations program.”

Mr. Davidson began his financial services career with Bankers Trust, where he held positions of increasing responsibility within the Global Institutional Services unit until joining the Investor Relations department in 1997. Following the acquisition of Bankers Trust by Deutsche Bank in 1999, Stephen assumed the role of Vice President of Investor Relations for North America of this dually listed company. From 2001 until joining MarketAxess in 2005, Mr. Davidson served as Director, Global Marketing and Communications at Prudential Financial.

Mr. Davidson received a B.A. in Government and International Relations from Franklin & Marshall College in 1990.

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. As the world’s largest exchange group by number of listings and market capitalization, NYSE Euronext is home to over 6,400 listed issues representing a combined $26.7 / 17.1€ trillion (as of June 30, 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 $157.0 /102.7€ billion (as of June 30, 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 and free real-time stock prices for all NYSE-listed securities, 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.