Stock Exchange Announcement, February 28, 2008 Change in holding in OMX NASDAQ OMX Group, Inc. (NASDAQ OMX) announced today that they have increased their holding in OMX AB over 90 percent on February 27, 2008. NASDAQ OMX's holding in OMX AB is now 117,227,931 shares which represents 97.2 percent of the shares and votes of OMX AB. The share capital of OMX AB consists of 120,640,467 shares. For further information, please contact: Jakob Håkanson, Vice President, Investor Relations, OMX +46 8 405 60 42