Merck(MRK) - 2025 Q4 - Annual Report

SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D. C. 20549 _________________________________ FORM 10-K ☒ Annual Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the Fiscal Year Ended December 31, 2025 As filed with the Securities and Exchange Commission on February 24, 2026 UNITED STATES OR ☐ Transition Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 For the transition period from to Commission File No. 1-6571 Merck & Co., Inc. 126 East Lincoln ...