Marsh & McLennan Officer Dean Klisura Files Form 144 to Sell $838K in Common Stock

Overview of Proposed Sale

On October 23, 2026, Dean Michael Klisura, an Officer of Marsh & McLennan Companies, Inc. (NYSE: MMC), filed a Form 144 notifying the SEC of a proposed sale of 4,194 shares of common stock. The aggregate market value of the proposed transaction is $838,800.00, implying an average price per share of $200.00.

Transaction Details and 10b5-1 Plan

• Filer: Dean Michael Klisura (Officer)
• Securities Offered: 4,194 shares of Common Stock
• Estimated Market Value: $838,800.00
• Broker: Fidelity Brokerage Services LLC
• Plan Adoption Date: December 10, 2025
• Acquisition Context: The 4,194 shares were originally acquired on February 28, 2026, from the issuer upon the vesting of restricted stock received as equity compensation.

Market Impact & Materiality Assessment

• Trading Significance: Low. The proposed sale involves 4,194 shares against an outstanding share count of 475,514,327, representing less than 0.001% of MMC's shares outstanding.
• Execution Context: The transaction is scheduled to take place under a pre-established Rule 10b5-1 trading plan adopted on December 10, 2025. This minimizes concerns regarding opportunistic trading based on material non-public information, reflecting routine executive compensation monetization.