NASDAQ OMX Group (NDAQ)

SUPPLEMENT

SUPPLEMENT (this “Supplement”) dated as of September 20, 2007 among The Nasdaq Stock Market, Inc., a Delaware corporation (“Nasdaq”), and OMX AB, a company duly incorporated and organized under the laws of Sweden (“OMX”).

WHEREAS, on May 25, 2007, Nasdaq and OMX entered into a Transaction Agreement (the “May 25 Agreement”) providing for, among other things, Nasdaq to make a public tender offer to acquire all of the Shares in consideration of a combination of cash and Nasdaq common stock (the “Nasdaq Offer”);

WHEREAS, on May 25, 2007, Nasdaq and OMX issued a press release announcing the terms of the Nasdaq Offer and the recommendation of the OMX Board that OMX shareholders accept the Nasdaq Offer, which recommendation was reiterated by the OMX Board on June 5, 2007;

WHEREAS, on August 9, 2007, Borse Dubai Limited, a company registered in the Dubai International Financial Centre in Dubai with company number 0447 (“Dubai”) announced that it was in the process of purchasing Shares and entering into option arrangements to acquire Shares (the “Dubai Options”);

WHEREAS, on August 17, 2007, Dubai announced (the “Dubai Offer Announcement”) a public tender offer to acquire all of the Shares for SEK 230 in cash (the “Dubai Offer”);

WHEREAS, on September 20, 2007 Nasdaq and Dubai entered into a binding letter agreement (the “Nasdaq Dubai Agreement”) providing for, among other things, (i), subject to the satisfaction of certain conditions, Nasdaq to withdraw the Nasdaq Offer and (ii) Dubai to sell all of the Shares acquired by it in the Dubai Offer and upon exercise of the Dubai Options to Nasdaq, all of the foregoing in accordance with the terms of the Nasdaq Dubai Agreement; and

WHEREAS, the Parties have concluded a Confidentiality Agreement dated March 12, 2007.

NOW THEREFORE, in consideration of the foregoing recitals and the mutual promises hereinafter set forth, the Parties hereto agree as follows:

Supplement

Nasdaq and OMX entered into a supplement (the “Supplement”) to their transaction agreement, dated May 25, 2007 (the “Transaction Agreement”). The Supplement modifies the board and committee composition of Nasdaq following its acquisition of OMX such that OMX’s board of directors shall be entitled to propose for nomination four directors to serve on The NASDAQ OMX Group’s board of directors and Borse Dubai shall be entitled to propose for nomination two directors to serve on The NASDAQ OMX Group’s board of directors. Three of the directors proposed for nomination by OMX’s board of directors must be independent for purposes of Nasdaq’s director independence standards and OMX may elect to have one-fourth of the members of each committee of The NASDAQ OMX Group’s board of directors be selected from those directors from or nominated by OMX’s board of directors. Both of the directors proposed for nomination by Borse Dubai must be independent for purposes of Nasdaq’s director independence standards and Borse Dubai may elect to have one member of certain committees of the board of directors, including the Audit, Executive, Finance, and Management Compensation committees, be appointed from those directors proposed for nomination by Borse Dubai, subject to applicable law, regulation or stock exchange listing standard.

Supplement

Nasdaq and OMX entered into a supplement (the “Supplement”) to their transaction agreement, dated May 25, 2007 (the “Transaction Agreement”). The Supplement modifies the board and committee composition of Nasdaq following its acquisition of OMX such that OMX’s board of directors shall be entitled to propose for nomination four directors to serve on The NASDAQ OMX Group’s board of directors and Borse Dubai shall be entitled to propose for nomination two directors to serve on The NASDAQ OMX Group’s board of directors. Three of the directors proposed for nomination by OMX’s board of directors must be independent for purposes of Nasdaq’s director independence standards and OMX may elect to have one-fourth of the members of each committee of The NASDAQ OMX Group’s board of directors be selected from those directors from or nominated by OMX’s board of directors. Both of the directors proposed for nomination by Borse Dubai must be independent for purposes of Nasdaq’s director independence standards and Borse Dubai may elect to have one member of certain committees of the board of directors, including the Audit, Executive, Finance, and Management Compensation committees, be appointed from those directors proposed for nomination by Borse Dubai, subject to applicable law, regulation or stock exchange listing standard.