Form 4 Filing for CME Group Inc.

This filing details transactions made by William R. Shepard, a director at CME Group Inc. On August 18, 2026, 2553.779 shares of Common Stock Class A were transferred to a revocable living trust, changing the form of beneficial ownership from direct to indirect. This transaction is exempt from Section 16. Following this, the indirect ownership of shares held by the trust increased by 2553.779. On September 25, 2026, Mr. Shepard acquired an additional 292.55 shares of Common Stock Class A through a dividend reinvestment plan at a price of $268.76 per share. The post-transaction number of shares owned indirectly by the trust is 263,288.642.