Form 4 Filing for CME Group Inc.

This filing details transactions made by Jack J. Tobin, MD Chief Accounting Officer of CME Group Inc., on September 15-16, 2026. On September 15, Tobin acquired 700 shares of Common Stock Class A at $275.09 per share and disposed of 44, 47, and 205 shares at the same price. On September 16, he disposed of an additional 51 shares at $272.46 per share. These transactions resulted in a post-transaction share count of 25,762. Footnote 1 indicates the acquisition was a restricted stock grant vesting over four years, contingent on continued service. Footnote 2 explains the disposed shares were used to cover tax withholding obligations related to previously granted restricted stock. The filing also includes a Power of Attorney document authorizing specific individuals to act on Tobin's behalf for SEC filings.