CME Group Inc. (Form: 8-K)  






Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

Date of Report (Date of Earliest Event Reported):   August 15, 2008

CME Group Inc.
(Exact name of registrant as specified in its charter)

Delaware 000-33379 36-4459170
(State or other jurisdiction
(I.R.S. Employer
of incorporation) File Number) Identification No.)
20 South Wacker Drive, Chicago, Illinois   60606
(Address of principal executive offices)
(Zip Code)
Registrant’s telephone number, including area code:   312-930-1000

Not Applicable
Former name or former address, if changed since last report


Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

[x]  Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)
[  ]  Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)
[  ]  Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))
[  ]  Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

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Item 8.01 Other Events.

On August 15, 2008, CME Group Inc. and NYMEX Holdings, Inc. issued a joint press release announcing that the closing date of their merger is anticipated to be August 22, 2008, assuming stockholder and member approval on Monday, August 18, 2008. Additionally, the companies announced that the election deadline for NYMEX Holdings stockholders to elect the form of consideration they will receive will be 5:00 p.m., Chicago time, on August 20, 2008. This is the time by which NYMEX Holdings stockholders must deliver their election forms to Computershare Trust Company, N.A., which is serving as the exchange agent.

Item 9.01 Financial Statements and Exhibits.

Joint Press Release of CME Group Inc. and NYMEX Holdings, Inc., dated August 15, 2008.

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Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

    CME Group Inc.
August 15, 2008   By:   Kathleen M. Cronin
        Name: Kathleen M. Cronin
        Title: Managing Director, General Counsel & Corporate Secretary

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Exhibit Index

Exhibit No.   Description

  Joint Press Release of CME Group Inc. and NYMEX Holdings, Inc., dated August 15, 2008