CME GROUP INC. — Share Issue/Capital Change 2012

May 25, 2012

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UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549

FORM 8-K

CURRENT REPORT

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

Date of Report (Date of Earliest Event Reported): May 24, 2012

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

Delaware	001-31553	36-4459170
___ (State or other jurisdiction	_______ (Commission	__ (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

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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:

[ ] 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 May 24, 2012, CME Group Inc. (the "Company") announced that its Board of Directors declared a five-for-one stock split of the Company’s Class A common stock, which will be effected through a stock dividend. The distribution date for the stock split will be July 20, 2012, for shareholders of record of the Company’s Class A and Class B common stock (the "Common Stock") on July 10, 2012. Such shareholders will be issued four additional shares of Class A common stock of the Company for each share of Common Stock owned on that date.

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Item 9.01 Financial Statements and Exhibits.

CME Group Press Release, dated May 24, 2012.

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SIGNATURES

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.

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Kathleen M. Cronin
Name: Kathleen M. Cronin
Title: Senior Managing Director, General Counsel & Corporate Secretary

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Exhibit Index

Exhibit No.	Description
99.1	CME Group Press Release, dated May 24, 2012.

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