The U.S. Securities and Exchange Commission (SEC ) declared effective the Form S-4 registration statement relating to the proposed combination between NYSE Group, Inc. and Euronext N.V. NYSE Group and Euronext N.V. have entered into an agreement providing for a combination of their businesses under a new holding company named NYSE Euronext. The combination will create the first global exchange group, encompassing seven exchanges in six countries.

NYSE Group Board of Directors has scheduled a special meeting of stockholders in New York City on Wednesday, December 20, 2006 , at 8:00 a.m. , Eastern Standard Time, at which they will ask the NYSE Group stockholders to vote to approve the proposed business combination. NYSE Group will begin mailing to shareholders its proxy statement/prospectus and voting materials for the special meeting this week.

“On behalf of Marsh Carter, our Chairman, and the other directors of the NYSE Group Board, I welcome the opportunity to present this proposal to our shareholders,” said John A. Thain, Chief Executive Officer, NYSE Group. “Our board unanimously recommends that NYSE Group shareholders vote to approve and adopt the combination agreement and transaction with Euronext to create the world’s first truly global financial marketplace.”

Completion of the combination requires, among other things, approval of (1) the holders of a majority of the shares of NYSE Group common stock outstanding and entitled to vote at the NYSE Group special meeting as of November 17, 2006, the record date for the NYSE Group special meeting; and (2) a majority of the votes validly cast at the Euronext Extraordinary General Meeting of Shareholders, which is scheduled to be held on Tuesday, December 19, 2006, at 11:00 a.m., Central European Time, in Amsterdam, The Netherlands. After receipt of shareholder approval and the requisite regulatory approvals, NYSE Euronext will launch an exchange offer to acquire all of the outstanding shares of Euronext.

If the combination is approved by NYSE Group’s and Euronext shareholders, and the exchange offer for Euronext shares is successful, the companies expect to close the transaction in the first quarter of 2007. The proxy statement/prospectus that will be used at the NYSE Group special meeting will be available within a few days at www.sec.gov and www.nyse.com, and the registration statement on Form S-4 of which the proxy statement/prospectus is a part is currently available at www.sec.gov and www.nyse.com.