Merck EVP Jennifer Zachary's Stock Transactions and RSU Vesting

This Form 4 filing reports equity transactions by Jennifer Zachary, EVP and General Counsel of Merck & Co., Inc. (MRK), on April 29, 2026. The filing shows two key transactions: 1) 2,951 restricted stock units vested and converted to common stock at $0 cost basis, and 2) a market transaction where Zachary acquired 2,951 shares at $110.03 per share and simultaneously disposed of 1,454 shares at the same price. Following these transactions, Zachary's direct holdings increased to 70,897.254 shares of Merck common stock, with an additional 5,903 restricted stock units remaining. The RSUs vest in three equal installments through April 29, 2028. These transactions represent typical executive compensation activity involving equity awards and portfolio management.