CME Group Chairman & CEO Terrence Duffy Sells $4.12M in Class A Common Stock

Insider Transaction Overview

On September 10, 2026, Terrence A. Duffy, Chairman and Chief Executive Officer of CME Group Inc. ($CME), executed open-market sales totaling 15,000 shares of Class A Common Stock across two transactions for aggregate proceeds of approximately $4.12 million.

Transaction Breakdown

• Batch 1: Sold 14,372 shares at a weighted average price of $274.41 (range: $273.875 to $274.85).
• Batch 2: Sold 628 shares at a weighted average price of $275.03 (range: $274.9056 to $275.0804).
• Rule 10b5-1 Plan: The filing indicates aff10b5One is marked 0, suggesting these transactions were not executed under an adopted Rule 10b5-1 trading arrangement.

Holdings & Impact

Prior to these transactions, Duffy held 55,630 directly owned shares. Following the disposition of 15,000 shares (~27.0% of his direct position), his direct ownership stands at 40,630 shares.

Significance Assessment

Given the insider's role as Chairman and CEO, the size of the divestment (over $4.1M), and the absence of an indicated Rule 10b5-1 plan, this filing carries High trading significance for market watchers.