Item 5.03 Amendments to Articles of Incorporation or Bylaws; Change in Fiscal Year.

On November 7, 2012, the Board of Directors (the "Board") of CME Group Inc. (the "Company") approved an amendment to Article III, Section 3.5 of the Company's Bylaws to replace the specific Board composition requirements relating to the diversity of interests from its trading community with a general requirement that the Nominating Committee and the Board shall take into consideration applicable board of directors composition requirements of the Commodity Futures Trading Commission. Section 3.5 was also amended to provide that the Nominating Committee shall include as a nominee the Company's Executive Chairman and President.

The foregoing description is only a summary, does not purport to be complete and is qualified in its entirety by reference to, and should be read in conjunction with, the complete text of the Amended and Restated Bylaws, which is filed as Exhibit 3.1 to this Current Report on Form 8-K and is incorporated herein by reference.

Item 9.01 Financial Statements and Exhibits.

Ninth Amended and Restated Bylaws of CME Group Inc.

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