NASDAQ OMX Group (NDAQ)

COVENANTS OF THE PARTIES

Section 5.01 Notices of Certain Events. From the date hereof until the termination of this DIFX Agreement in accordance with its terms, Nasdaq, on the one hand, and DIFX and Borse Dubai, on the other hand, shall promptly notify the other Parties of:

(a) any notice or other communication from any Person alleging that the consent of such Person is or may be required in connection with the transactions contemplated by this DIFX Agreement or any DIFX Ancillary Agreement;

(b) any notice or other communication from any Authority in connection with the transactions contemplated by this DIFX Agreement or any DIFX Ancillary Agreement;

(c) any Proceeding, whether civil, criminal, administrative, regulatory or investigative, commenced or, to its knowledge, threatened against, relating to or involving or otherwise affecting any Party that relates to the transactions contemplated by this DIFX Agreement or any DIFX Ancillary Agreement; and

(d) (i) the occurrence or failure to occur of any event that would be likely to cause or that has caused any of a Party’s representations or warranties in this DIFX Agreement to be untrue or inaccurate in any

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material respect at any time from the date hereof until the Closing or to cause any of the conditions set forth in Section 6.01, 6.02 or 6.03 not to be satisfied or (ii) any material failure on such Party’s part to comply with or satisfy any covenant, condition or agreement to be complied with or satisfied by such Party hereunder; provided, however, that the delivery of any notice pursuant to this Section 5.01 shall not limit or otherwise affect the remedies available hereunder to the Party receiving or delivering such notice or constitute an admission with respect to the Party delivering or receiving such notice.

Section 5.02 Reasonable Best Efforts; Further Assurances.

(a) Subject to the terms and conditions of this DIFX Agreement and the DIFX Ancillary Agreements, each of Nasdaq, DIFX and Borse Dubai shall use their reasonable best efforts to take, or cause to be taken, all actions and to do, or cause to be done, all things necessary or desirable under applicable laws and stock exchange regulation, to cause to be satisfied all conditions to the Parties’ obligations under this DIFX Agreement and the DIFX Ancillary Agreements and to consummate and make effective the transactions contemplated by this DIFX Agreement and the DIFX Ancillary Agreements. In connection therewith, if any Proceeding is instituted or threatened to be instituted or any legislation is proposed or threatened to be proposed by any Authority which Proceeding or legislation (i) is reasonably likely to materially delay consummation of the Closing or (ii) challenges any transaction contemplated by this DIFX Agreement and the DIFX Ancillary Agreements, then each of Nasdaq, DIFX and Borse Dubai shall (by negotiation, litigation or otherwise) cooperate and use their reasonable best efforts to contest, resist or avoid any such Proceeding or legislation, including any administrative or judicial action, and to have vacated, lifted, reversed or overturned any decree, judgment, injunction or other order, whether temporary, preliminary or permanent, that is in effect and that prohibits, prevents, materially delays or materially restricts consummation of the transactions contemplated by this DIFX Agreement and the DIFX Ancillary Agreements, including by pursuing reasonable avenues of administrative and judicial appeal.

(b) Nasdaq, DIFX and Borse Dubai agree to execute and deliver such other documents, certificates, agreements and other writings and to take such other actions as may be necessary or desirable in order to consummate or implement expeditiously this DIFX Agreement and the DIFX Ancillary Agreements or the transactions contemplated hereby and thereby.

(c) For purposes of this DIFX Agreement, reasonable best efforts shall not require any Party to take any actions or steps that such Party, in its reasonable judgment, deems materially adverse to the benefit it expects to receive from the transactions contemplated by the OMX Transaction Agreement or the DIFX Agreement, including any condition that would prevent Borse Dubai from obtaining equity accounting treatment for its investment in Nasdaq or Nasdaq from receiving equity accounting treatment for its investment in DIFX, but in each case subject to such Party first taking into account possible alternative arrangements, which the Parties agree to negotiate in good faith.

Section 5.03 Certain Filings.

(a) If any filings under any applicable competition, merger control, antitrust or similar law are required in connection with the transactions contemplated by this DIFX Agreement and the DIFX Ancillary Agreements, Nasdaq, Borse Dubai and DIFX shall file with the proper authorities all forms and other documents necessary to receive the necessary approvals under such law, and shall use their reasonable best efforts to secure such approval. Borse Dubai and Nasdaq shall share equally all filing fees associated with such competition filings.

(b) Nasdaq shall give Borse Dubai and DIFX, and DIFX and Borse Dubai shall give Nasdaq, reasonable prior notice of any material written or oral communication and any proposed understanding, undertaking or agreement with, any Authority relating to the consummation of the transactions contemplated hereby. In addition, each Party shall furnish the other Party with copies of all correspondence, filings, and communications (and memoranda setting forth the substance thereof) between it and its Representatives, on the one hand, and any Authority or members of their respective staffs, on the other hand, with respect to this DIFX Agreement and the DIFX Ancillary Agreements and the transactions

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contemplated hereby and thereby. Nasdaq shall not make any proposals relating to, or enter into, any understanding, undertaking or agreement with any Authority relating to the consummation of any of the transactions contemplated hereby without the prior review and approval of DIFX and Borse Dubai, and DIFX and Borse Dubai shall not make any proposal, or enter into any understanding, undertaking or agreement, relating to the consummation of any of the transactions contemplated hereby without the prior review and approval of Nasdaq.

Section 5.04 Public Announcements. Nasdaq, DIFX and Borse Dubai and each of their Affiliates agree to consult with each other before issuing any press release or making any public statement with respect to this DIFX Agreement or any of the transactions contemplated hereby and shall not issue any such press release or make any such public statement prior to receiving the written consent of the other Parties, except as may be required by applicable law or stock exchange regulation, in which case reasonable best efforts to consult between the Parties is required to the extent practicable.

Section 5.05 Other Agreements.

(a) Between the date of this DIFX Agreement and the Closing, unless Nasdaq shall otherwise consent in writing (such consent not to be unreasonably withheld or delayed), the business of DIFX shall be conducted only in the ordinary course of business in all material respects, and DIFX shall use commercially reasonable efforts to preserve intact in all material respects its business organization.

(b) Until the earlier of the Closing or earlier termination of this DIFX Agreement, each of the Parties agrees that none of it or its respective Subsidiaries, Affiliates, successors or assigns shall, and each Party shall instruct its Representatives not to, in any way disparage, attempt to discredit, or otherwise call into disrepute, any other Party or such other Party’s Subsidiaries, Affiliates, successors, assigns, stockholders or Representatives, or any of such Party’s products or services, in any manner that could reasonably be expected to (i) damage the business or reputation of such other Party, its products or services or its Subsidiaries, Affiliates, successors, assigns or Representatives or (ii) subject to the terms of this DIFX Agreement, disrupt, impede, hinder or delay such other Party’s attempts to consummate the transactions contemplated by this DIFX Agreement and the DIFX Ancillary Agreements. Without limiting the foregoing, neither Party shall make any comments or statements to any non-Party (including the press, employees or former employees of the other Party, any client or prospective or former client of the other Party, any individual or entity with whom the other Party has a business relationship or any other Person), if such comment or statement reasonably could be expected to adversely affect the conduct of the business of the other Party, or any of its plans or prospects or the business reputation of such other Party or any of such other Party’s products or services or that of any of its Subsidiaries, Affiliates, successors, assigns or Representatives, except as may be required by applicable law, Authority, judicial order or subpoena; provided, however, that any party making such comments or statements to comply with applicable law, Authority, judicial order or subpoena shall, to the extent that such grant would not conflict with applicable law, first grant each other party reasonable opportunity to review such comments or statements.

(c) Until the Closing, each of the Parties shall, and shall cause its Affiliates to, keep confidential, disclose only to its Affiliates or Representatives and use only in connection with the transactions contemplated by this DIFX Agreement and the DIFX Ancillary Agreements all information and data obtained by them from the other Party or its Affiliates or Representatives relating to such other Party or the transactions contemplated hereby (other than information or data that (i) is or becomes available to the public other than as a result of a breach of this Section, (ii) was available on a non-confidential basis prior to its disclosure to or by one Party to another, or (iii) becomes available to one Party on a non-confidential basis from a source other than the other Party, provided that such source is not known by the receiving Party, after reasonable inquiry, to be bound by a confidentiality agreement with either of the non-receiving Parties or their Representatives and is not otherwise prohibited from transmitting the information to the receiving Party by a contractual, legal or fiduciary obligation), unless disclosure of such information or data is required by applicable law. In the event that the transactions contemplated hereby are not consummated,

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each Party shall, and shall use its commercially reasonable efforts to cause its Affiliates and Representatives to, promptly return to the other Party or destroy all documents (including all copies thereof) containing any such information or data. From and after the Closing, the rights and obligations of the Parties hereto with respect to the information described in this paragraph shall be governed by Section 6.4 of the DIFX Stockholders’ Agreement.

(d) Nasdaq agrees to enter into discussions with DIFX and The Depository Trust & Clearing Corporation to establish clearing linkages between DIFX and The Depository Trust & Clearing Corporation.

(e) Nasdaq agrees to enter into discussions with Borse Dubai and DIFX to become a routing broker-dealer on DIFX’s owned exchanges.

(f) Nasdaq agrees to establish technical trading linkages between Nasdaq’s U.S. equity market and DIFX.

(g) The Parties shall use their reasonable best efforts to procure that OMX will become a party to the Technology License and Marketing Agreement and the Trademark License Agreement immediately prior to the Closing (failing which, as soon as applicable following Closing) to extent necessary to enable Borse Dubai and DIFX to obtain the benefits of the provisions hereof and thereof applicable to OMX after the Closing.

Section 5.06 Fees and Expenses. Except as set forth in Section 5.03(a), whether or not the transactions contemplated by this DIFX Agreement are consummated, all costs and expenses incurred in connection with this DIFX Agreement and the transactions contemplated hereby shall be paid by the Party incurring such expense.