Business Update & Financial Outlook

Animal Health: Growth driven by livestock and companion animal • Animal Health sales increased 2% to $1.5B - Livestock growth of 2% reflects price actions and increased demand for swine and poultry products, partially offset by lower demand for ruminant products due in part to reduced herd sizes - Companion Animal growth of 2% reflects price actions including for BRAVECTO, partially offset by supply challenges for certain vaccines Growth rates exclude the impact of foreign exchange. MERCK Animal Health $1.5B +27% $1.5B +5% $1.5B +2% 2Q21 2Q22 2Q23 MERCK 15

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