Hereby, OMX AB announces the content of the notice concerning the Extraordinary General Meeting of OMX AB on April 21, 2008. Attachment: Notice of Extraordinary General Meeting of OMX AB. For more information, please contact: Jonas Rodny, Media contact, NASDAQ OMX +46 8 405 72 67 Gustav Back, Investor Relations, NASDAQ OMX +46 8 405 64 82 Notice to attend the Extraordinary General Meeting The shareholders of OMX AB (publ) (“OMX”) are hereby given notice to attend an Extraordinary General Meeting to be held on Monday, April 21, 2008 at 5:00 p.m. at OMX's head office, Tullvaktsvägen 15 in Stockholm. A total of 120,640,427 shares and votes are outstanding as of April 1, 2008. Registration Shareholders who wish to participate in the Extraordinary General Meeting must be listed in the register of shareholders maintained by VPC AB (“VPC”) not later than Tuesday, April 15, 2008, and inform OMX of their intention to attend, either by post to OMX AB (publ), SE-105 78 Stockholm, Sweden, or by telephone +46-8-405 60 00, not later than Thursday, April 17, 2008 at 4:00 p.m. Registration must include the shareholder's name, personal identity number/corporate registration number, address and telephone number, as well as the number of advisors. Registration can also be made by email to egm@omxgroup.com. Powers of attorney, registration certificates and other documentation of eligibility should be received by OMX at the above address not later than Thursday, April 17, 2008, to facilitate admission to the Extraordinary General Meeting. Shareholders whose shares are nominee-registered through the notary department of a bank or with a private securities broker must temporarily register their shares with VPC in their own name to be entitled to vote at the Extraordinary General Meeting. This re-registration must be made not later than Tuesday, April 15, 2008. This means that shareholders must notify their nominee of such registration well in advance of that date. Instructions for holders of shares registered in owners accounts with the Finnish APK central securities depository Finnish shareholders who have their shares registered in owner accounts with the Finnish central securities depository (“APK”) are nominee-registered at VPC, and APK will automatically reregister these shareholders on Monday, April 14, 2008. However, these Finnish shareholders must also notify OMX themselves of their intention to participate in the Meeting, in accordance with the instructions above. Instructions to holders of shares registered in the Danish Central Securities Depository Danish shareholders who have their shares registered with the Danish Central Securities Depository (“Værdipapircentralen”) must re-register their shares with VPC in their own name to be entitled to vote at the Extraordinary General Meeting. The re-registration of shares must be made well in advance and not later than 4:00 p.m. on Monday, April 14, 2008. Registration must be made to VP Investor Services A/S, Helgeshøj Allé 61, P.O. Box 20, DK-2630 Taastrup, Denmark, by telephone +45-4358 8866, or by fax +45-4358 8867. On Tuesday, April 15, 2008, Værdipapircentralen will conduct any necessary re-registration of shares with VPC. As in the case of Finnish shareholders, Danish shareholders must also personally notify OMX of their intention to participate in the Meeting, in accordance with the instructions above. PROPOSED AGENDA 1. Opening of the Meeting 2. Election of Chairman of the Meeting 3. Establishment and approval of the voters' list 4. Approval of the agenda 5. Election of one or two persons to verify the minutes 6. Determination as to whether the Meeting was duly convened 7. Decision on the number of members of the Board of Directors 8. Election of members of the Board of Directors 9. Determination of Board fees 10. Closing of the Meeting PROPOSALS FOR DECISIONS With respect to the fact that as per February 27, 2008 the NASDAQ OMX Group controls more than 90 percent of the votes and capital in OMX AB, all members of the Board of Directors have issued notification that their assignments are to be terminated. Point 7 - Motion concerning number of members of the Board of Directors The Board proposes that the number of Board members be five individuals. Point 8 - Motion concerning election of members of the Board of Directors The Board proposes that Magnus Böcker, Hans-Ole Jochumsen, Markus Gerdien, Anna Ewing and David Warren be elected as ordinary Board members to hold office until the end of the next Annual General Meeting. After elections following the Board's proposal, the Board of Directors will accordingly comprise Magnus Böcker, Hans-Ole Jochumsen, Markus Gerdien, Anna Ewing and David Warren. Magnus Böcker was born in 1961. He is the President of NASDAQ OMX Group Inc, and the President and CEO of OMX AB. He has been employed at companies that are now part of the NASDAQ OMX Group since 1986 and his previous positions at OMX have included Vice President and President of OM Technology. 1989-1996 he was Chief Financial Officer and member of Executive Management. Hans-Ole Jochumsen was born in 1957. He is Executive Vice President, Transaction Services Nordics. He has been employed at companies that are now part of the NASDAQ OMX Group since 1998. He has previously held such positions as President and member of Executive Management of BG Bank, 1996-1998; President and member of Executive Management of Girobank, 1994-1996; and President and member of the Executive Management of BRFkredit, 1990-1994. Markus Gerdien was born in 1960. He is Executive Vice President, Market Technology. He has been employed at NASDAQ OMX since 2005. His previous positions include EVP Market & Business Development at Observer Group AB, EVP Communication Tools Division at Common Agenda Venture Management AB 2000-2002, partner and Co-founder of Front Capital Systems AB and Managing Director, Member of the Company Management Group and Sales and Marketing Manager between 1988 and 2000. Anna Ewing is Executive Vice President, Operations and Technology and has been Chief Information Officer of NASDAQ Stock Market, Inc since 2005. She was previously employed at CIBC World Markets in New York and Toronto, where she served as Managing Director of Global Applications Services. Before that, she served as Vice President at Merrill Lynch, where she held various leadership positions within the Corporate and Institutional Client Group Technology Division, including Global Head of Institutional Client Technology, Global Head of Financial Futures and Options Technology, Global Head of Prime Brokerage Technology and Regional Head of Technology at Merrill Lynch in Canada. David Warren has been the Chief Financial Officer of NASDAQ OMX since July 2001. He joined the company in 2001, initially serving as Chief Administrative Officer. He previously held the position of CFO of the Long Island Power Authority, Deputy Treasurer for the State of Connecticut and Vice President of CS First Boston. The Board proposes that Magnus Böcker be elected Chairman of the Board. With respect to the company's current ownership situation with the NASDAQ OMX Group holding more than 90 percent of the votes and capital and OMX AB's application on March 17 2008, for the delisting of the company on May 2, 2008, the Board finds grounds to deviate from the Swedish Code of Corporate Governance's requirements regarding the composition of the Board and listing requirements on the OMX Nordic Exchange. Point 9 - Motion concerning Board fees With respect to the fact that all newly elected Board members are employed in the NASDAQ OMX Group, the Board proposes that no fees be paid to Board members. For Board members who have left the Board, fees will be paid in accordance with the decision made by shareholders at the Annual General Meeting held in April 2007. Personal information that shareholders have submitted to the company will be used only in connection with the Extraordinary General Meeting and the requisite registration and processing associated with the Meeting. Stockholm, April 2008 OMX Aktiebolag (publ) Board of Directors This information is disclosed according to applicable law and exchange rules. About OMX | OMX is a leading expert in the exchange industry. The OMX Nordic Exchange comprises over 800 companies including its alternative market First North. OMX provides technology to over 60 exchanges, clearing organizations and central securities depositories in over 50 countries. The Nordic Exchange is not a legal entity but describes the common offering from OMX exchanges in Helsinki, Copenhagen, Stockholm, Iceland, Tallinn, Riga, and Vilnius. OMX is a Nordic Large Cap company in the Financials sector on the OMX Nordic Exchange. For more information, please visit www.omxgroup.com.