Form 4 Filing for CME Group Inc.

Phyllis M. Lockett, a director at CME Group Inc., acquired 645 shares of Common Stock Class A on June 25, 2026, at a price of $225.00 per share. This transaction, part of the annual equity compensation program for non-employee directors, resulted in a post-transaction holding of 4,285 shares. The shares were fully vested upon receipt and not subject to further vesting conditions. The filing also includes a power of attorney document authorizing representatives to handle SEC filings on behalf of Ms. Lockett.