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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 (see General Instruction A.2. below):

Securities registered pursuant to Section 12(b) of the Act:

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405) of this chapter or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).

Emerging growth company  ☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

On May 14, 2026, CME Group Inc. (the “Company”) held its 2026 Annual Meeting of Shareholders (the “Annual Meeting”). Due to lack of quorum among the Class B-1, Class B-2 and Class B-3 shareholders, the proposals presented under Items 4 through 8 were adjourned until June 9, 2026. These Items are described in further detail in the Company's definitive proxy statement on Schedule 14A filed with the SEC on March 23, 2026.

On June 9, 2026, the Company reconvened its Annual Meeting with regard to Items 4 through 8. At the close of business on March 16, 2026, the record date of the Annual Meeting, the Company had 362,808,081 shares of Class A and Class B common stock issued and outstanding. The following shares were present at the adjourned Annual Meeting, either in person or by proxy (total excludes broker non-votes):

For each class of common stock voting separately on a proposal being presented at the Annual Meeting at least 33.3% of the class of common stock issued and outstanding must be present at the Annual Meeting to obtain quorum. Accordingly, the shares of Class B-3 common stock did not reach quorum and, therefore, Items 6 and 8c were not presented for approval to the Class B-3 shareholders.

The results of the proposals that were voted on at the adjourned Annual Meeting are as follows:

1.Item 4 - The proposal to eliminate the right of the Class B-1 shareholders to elect three directors did not pass. In order to pass, this Item required an affirmative vote from the holders of a majority of the outstanding shares of Class B-1 common stock voting as a single class and an affirmative vote from the holders of a majority of the outstanding shares of Class A and all Class B shareholders voting together as a single class.

2.Item 5 - The proposal to eliminate the right of the Class B-2 shareholders to elect two directors did not pass. In order to pass, this Item required an affirmative vote from the holders of a majority of the outstanding shares of Class B-2 common stock voting as a single class and an affirmative vote from the holders of a majority of the outstanding shares of Class A and all Class B shareholders voting together as a single class.

3.Item 6 - The proposal to eliminate the right of the Class B-3 shareholders to elect one director did not achieve quorum.

4.Item 7 - The proposal relating to an amendment to our certificate of incorporation passed; however, the amendment will not be filed, since its approval was contingent upon the approval of Items 4, 5 and 6. In order to pass, this Item required affirmative approval from the holders of a majority of the outstanding shares of Class A and Class B shareholders voting together as a single class.

5.Item 8 - Election of the Class B Directors:

a.Each of the Class B-1 directors have been re-elected to serve until the 2027 annual meeting of shareholders. For this Item, only Class B-1 shareholders vote.

b.The Class B-2 director has been re-elected to serve until the 2027 annual meeting of shareholders. For this Item, only Class B-2 shareholders vote.

c.In the election of one Class B-3 Director, no quorum was achieved. Therefore, Elizabeth A. Cook is a “holdover” under Delaware law and the Company’s bylaws. She will continue to serve until her successor is duly elected at the 2027 Annual Meeting or her earlier resignation.

Pursuant 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.