Merck (NYSE: MRK), known as MSD outside the United States and Canada, has been notified that Tutanota LLC (Tutanota) has commenced an unsolicited “mini-tender” offer, dated November 10, 2025, to purchase up to 1,000,000 shares of Merck common stock at $65.00 per share. The offer price is approximately 24.66% below the closing price of Merck common stock on November 7, 2025 ($86.28), the last trading day before the date of the offer, and approximately 31.56% below the closing price of Merck common stock on November 20, 2025 ($94.97), the day prior to this release. Merck does not endorse Tutanota’s offer and recommends that Merck shareholders reject the offer and not tender their shares in response to Tutanota’s unsolicited mini-tender offer. This mini-tender offer is at a price below the closing price for Merck’s shares (as of the day prior to this release) and is subject to numerous conditions, including Tutanota’s ability to obtain financing. Merck is not associated in any way with