Third-Quarter 2025 Sales and Earnings Merck & Co., Inc., Rahway, N.J., USA October 30, 2025 Strategy and Business Update Robert M. Davis Chairman and Chief Executive Officer Financial Results and Outlook Caroline Litchfield Executive Vice President and Chief Financial Officer Research Update Dr. Dean Y. Li Executive Vice President and President, Research Laboratories Question & Answer Session 2 Agenda Agenda Forward-looking statement of Merck & Co., Inc., Rahway, N.J., USA This presentation of Merck & Co., ...