CME Group: Amendments To Articles Of Incorporation Or Bylaws; Change In Fiscal Year, Financial Statements And Exhibits

Item 5.03 Amendments to Articles of Incorporation or Bylaws; Change in Fiscal Year.On September 24, 2026, CME Group Inc. (the “Company”) filed a certificate of elimination with the Secretary of State of the State of Delaware which, effective upon filing, eliminated from the Company’s certificate of incorporation all matters set forth in the certificate of designations with respect to the Company’s Series G Non-Voting Convertible Preferred Stock (the “Series G Preferred Stock”). No shares of the Series G Preferred Stock were issued and outstanding at the time of the filing of the certificate of elimination. A copy of the certificate of elimination is filed as Exhibit 3.1 to this report and incorporated herein by reference.Item 9.01. Financial Statements and Exhibits.ExhibitNumber Description3.1 Certificate of Elimination of Series G Non-Voting Convertible Preferred Stock of CME Group Inc.104 The cover page from CME Group Inc.’s Current Report on Form 8-K, formatted in Inline XBRL.SIGNATURESPursuant to the requirements of the Securities Exchange Act of 1934, as amended, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized. CME Group Inc.RegistrantDate: September 25, 2026By:/s/ Lynne FitzpatrickName:Title:Lynne FitzpatrickSenior Managing Director, President and Chief Financial Officer

CME Group: Amendments To Articles Of Incorporation Or Bylaws; Change In Fiscal Year, Financial Statements And Exhibits

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