NASDAQ and OMX to Combine

The boards of directors of The Nasdaq Stock Market, Inc. ("NASDAQ") and OMX AB (publ) ("OMX") (STO:OMX) jointly announce that they have entered into an agreement (the "Transaction Agreement") to combine the two companies (the "Combination" or the "Transaction"), creating the world's premier exchange and technology company. The Combination will create the largest global network of exchanges and exchange customers linked by technology. The Combination will provide significant benefits for customers, shareholders and other stakeholders in both companies. The new group, to be called The NASDAQ OMX Group (the "Combined Group"), brings together two companies with a common culture and vision of innovation, competitiveness and pioneering technological expertise. NASDAQ OMX Group combines two highly complementary businesses, uniting NASDAQ's leading global brand, highly efficient electronic trading platform and track record of customer focused innovation with OMX's global technology services platform and customer base, efficient Nordic Exchange, derivatives capabilities and track record of successful cross-border exchange integrations.

The Combination will be effected through a cash and stock tender offer (the "Offer") by NASDAQ for all outstanding shares in OMX. The consideration offered is equivalent to 0.502 new NASDAQ shares plus SEK94.3 in cash for each OMX share. Based on NASDAQ's closing price on 23 May, 2007, the Offer values OMX at SEK208.1 per share , equivalent to SEK25.1 billion ($3.7 billion) and represents a premium of 19 percent to the closing price of SEK174.5 per OMX share on 23 May, 2007, the last full trading day prior to the announcement of the Offer and a premium of 25 percent to the volume weighted average price of SEK165.9 per OMX share over the 20 trading days up to and including 23 May, 2007.

Robert Greifeld, Chief Executive Officer of NASDAQ, commented:

"The future of exchanges is about technology, flexibility and scale. NASDAQ and OMX together deliver all of these benefits. Our technology leadership and track record in linking trading platforms means we will offer issuers and investors unique benefits which were not available in one company until now. This combination provides our organizations with the ability to grow and accelerate the global flow of equity capital. At the same time, it provides us with an excellent platform for further expansion into derivatives and other asset classes. Our organizations bring together very complementary businesses, and we see many new opportunities for growth in an era of unprecedented change and development for exchanges."

Magnus Bocker, Chief Executive Officer of OMX, commented:

"This combination creates a new leader in the exchange industry. By utilizing the combined entities' joint expertise and competencies we will create an outstanding platform for future growth. Issuers, members, information vendors and investors on both NASDAQ and OMX Nordic Exchange will all benefit from its new global context. The combination also provides benefits for OMX's global technology customer base, as it enables an increased focus on research and product development in the most important and fastest growing areas of the exchange technology market."

H. Furlong Baldwin, Chairman of NASDAQ, commented:

"We are each coming at this combination from a position of strength. At NASDAQ, we are privileged to be partnering with such a reputable institution as the OMX."

Urban Backstrom, Chairman of OMX, commented:

"For OMX, as a company that has always been known for its innovative and ground-breaking approach within the exchange industry, this is the natural next step. This will also strengthen the Nordic region as a financial center."

The Combined Group will have 2,349 employees in 22 countries with pro forma revenues for the financial year 2006 of more than $1.2 billion (SEK8.3 billion). The relative values of the companies under the terms of the Offer and based on NASDAQ's closing share price as of 23 May, 2007 are 58 percent NASDAQ and 42 percent OMX. The pro forma market capitalization of The NASDAQ OMX Group will be approximately $7.1 billion (SEK48.6 billion) , of which NASDAQ shareholders will own approximately 72 percent and OMX shareholders will hold approximately 28 percent as a result of the cash component of the Offer. The Combined Group will be governed by representatives from both NASDAQ and OMX under the leadership of Robert Greifeld, who will serve as Chief Executive Officer and Magnus Bocker, who will serve as President. The board of directors of the Combined Group will consist of 15 members, including nine representatives from NASDAQ, five representatives from OMX and the Chief Executive Officer of the Combined Group. The NASDAQ OMX share will be listed on NASDAQ and on OMX Nordic Exchange.

The Combination is unanimously recommended by the boards of directors of each of OMX and NASDAQ. Investor AB, Nordea Bank AB and Magnus Bocker, together representing approximately 16.6 percent of OMX's current issued ordinary share capital, have entered into irrevocable undertakings to accept the Offer and, if a mix and match facility is included in the Offer, depending on the structure and the terms of the facility, they will elect to receive all shares, subject to proration. Olof Stenhammar & Company, representing approximately 1.6 percent of OMX's current issued ordinary share capital, has expressed its support for the Combination and its intention to become a long term shareholder in the Combined Group. In addition, Hellman & Friedman, Silver Lake Partners, and Robert Greifeld have each agreed to vote their shares in favor of certain matters related to the Offer at the related NASDAQ shareholders' meeting, subject to the terms of NASDAQ's certificate of incorporation.

The Combination will create:

-- PREMIER GLOBAL EXCHANGE COMPANY: NASDAQ is the premier US equities exchange, handling more shares and listing more companies than any other US exchange. NASDAQ's open and innovative market platform is the first choice for issuers as well as investors. OMX Nordic Exchange is a highly integrated, efficient equities and derivatives market for leading European companies. Together, the NASDAQ and OMX exchanges will process an average daily volume of 7.4 million trades, representing a value of approximately $61 billion (SEK418 billion). The NASDAQ and OMX exchanges will have approximately 4,000 companies listed from 39 countries with an aggregate market capitalization of approximately $5.5 trillion (SEK37.6 trillion);

-- WORLD EXCHANGE TECHNOLOGY LEADER: OMX has been a pioneer in creating a truly integrated cross-border stock market. OMX also has created a world-renowned technology customer base of equity, debt, and derivatives exchanges with 60 clients in 50 countries worldwide, including Hong Kong, Singapore, Australia, and the US. NASDAQ pioneered electronic trading, and has continued to innovate over the last thirty years and now has the fastest, most efficient trading platform in the US. Together, the Combined Group will provide the technology for the world's increasingly competitive and demanding capital markets;

-- INCREASED VISIBILITY AND ACCESS TO THE GLOBAL INVESTMENT MARKETPLACE FOR ISSUERS: Issuers will be associated with an innovative, future-focused company with blue-chip peers in all industry sectors. Listed companies will have access to a broad base of investors and deep pools of liquidity;

-- A HIGHLY COMPETITIVE DERIVATIVES MARKET OFFERING: OMX Nordic Exchange is Europe's third largest marketplace for trading and clearing equity-related derivatives. OMX's Nordic distribution network is extended through an international network of links to cooperating exchanges and clearinghouses. OMX's technology solutions are also being used by other leading derivatives exchanges around the world and will be a key asset in the Combined Group's opportunities to capture the high growth in derivatives trading globally;

-- ENHANCED STRATEGIC OPPORTUNITIES: The Combined Group will be the partner of choice for future cooperation and consolidation opportunities and have increased financial and managerial resources. The combined entity will be well positioned to drive organic growth and to continue to take a proactive role in sector consolidation, in Europe, emerging markets, the Americas and Asia; and

-- SIGNIFICANT SYNERGY POTENTIAL: Both parties believe the Combination will create substantial value for shareholders, with total pre-tax annual synergies estimated at $150 million (SEK1,025 million). Of this amount, $100 million (SEK683 million) constitutes estimated cost synergies and $50 million (SEK342 million) estimated revenue synergies. Cost synergies will be realized through the rationalization of IT systems and data centres, rationalization of non-IT functions, and reduced capital and procurement expenditure. Revenue synergies will be achieved through the creation of deeper liquidity pools, increased cross-border trading, increased international listings, packaged data products and enhanced technology sales.

The Combination is expected to create substantial value for shareholders and to be accretive to earnings per share in 2009.

This summary should be read in conjunction with the text of the attached full announcement.

A joint press and analyst conference regarding the Offer and Combination of NASDAQ and OMX will be held today at 10.00am CET at OMX Headquarters, Tullvaktsvagen 15, Stockholm. If you are unable to attend the meeting in person, you can listen via: Sweden: +46(0)850520270 UK: +44(0)2088179301 US: +1 7183541226

The presentation will also be webcast and can be found on www.omxgroup.com and on www.nasdaq.com

In addition NASDAQ and OMX will host a second conference call for the benefit of US based analysts and investors, to be held at 8.00am EDT: Title: NASDAQ Conference Call Domestic dial-in: 866-765-6327 International dial-in: +1 913-312-6621

And at 9.00am EDT, there will be a press call: Title: NASDAQ Conference Call Domestic dial-in: 800 810-0924 International Q&A: +1 913 981-4900

A presentation on the Combination will be available today on NASDAQ's (www.nasdaq.com) and OMX's (www.omxgroup.com) websites.

Cautionary Note Regarding Forward-Looking Statements

Information set forth in this filing contains forward-looking statements, which involve a number of risks and uncertainties. OMX and NASDAQ caution readers that any forward-looking information is not a guarantee of future performance and that actual results could differ materially from those contained in the forward-looking information. Such forward-looking statements include, but are not limited to, statements about the benefits of the Offer, the proposed business combination transaction involving NASDAQ and OMX, including estimated revenue and cost synergies, the Combined Group's plans, objectives, expectations and intentions and other statements that are not historical facts. Additional risks and factors are identified in NASDAQ's filings with the U.S. Securities Exchange Commission (the "SEC"), including its Report on Form 10-K for the fiscal year ending December 31, 2006 which is available on NASDAQ's website at http://www.NASDAQ.com and the SEC's website at SEC's website at www.sec.gov. and in OMX's filings with the Swedish Financial Supervisory Authority (Sw. Finansinspektionen) (the "SFSA") including its annual report for 2006, which is available on OMX's website at http://www.omxgroup.com. The parties undertake no obligation to publicly update any forward-looking statement, whether as a result of new information, future events or otherwise.

Notice to OMX shareholders

While the Offer is being made to all holders of OMX shares, this document does not constitute an offer to purchase, sell or exchange or the solicitation of an offer to purchase, sell or exchange any securities of OMX or an offer to purchase, sell or exchange or the solicitation of an offer to purchase, sell or exchange any securities of NASDAQ in any jurisdiction in which the making of the Offer or the acceptance of any tender of shares therein would not be made in compliance with the laws of such jurisdiction. In particular, the Offer is not being made, directly or indirectly, in or into Australia, Canada, Japan or South Africa. While NASDAQ reserves the right to make the Offer in or into the United Kingdom or any other jurisdiction pursuant to applicable exceptions or following appropriate filings and prospectus or equivalent document publication by NASDAQ in such jurisdictions, pending such filings or publications and in the absence of any such exception the Offer is not made in any such jurisdiction.

Additional Information about this Transaction

In connection with the proposed business combination transaction, OMX and NASDAQ expect that NASDAQ will file with the SEC a Registration Statement on Form S-4 that will include a proxy statement of NASDAQ that also constitutes a prospectus of NASDAQ. Investors and security holders are urged to read the proxy statement/prospectus and any amendments and other applicable documents regarding the proposed business combination transaction if and when they become available because they will contain important information. You may obtain a free copy of those documents (if and when available) and other related documents filed by NASDAQ with the SEC at the SEC's website at www.sec.gov. The proxy statement/prospectus (if and when it becomes available) and the other documents may also be obtained for free by accessing NASDAQ's website at http://www.nasdaq.com and OMX's website at http://www.omxgroup.com.

NASDAQ and its directors and executive officers and other members of management and employees may be deemed to be participants in the solicitation of proxies from NASDAQ stockholders in respect of the transactions described in this communication. You can find information about NASDAQ's executive officers and directors in NASDAQ's definitive proxy statement filed with the SEC on April 20, 2007. You can obtain free copies of these documents and of the proxy statement prospectus (when it becomes available) from NASDAQ by accessing its website at http://www.nasdaq.com. Additional information regarding the interests of such potential participants will be included in the proxy statement/prospectus and the other relevant documents filed with the SEC when they become available.

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