Merck & Co., Inc. Form 8-K Filing

On May 22, 2026, Merck & Co., Inc. successfully closed an underwritten public offering, issuing a total of $6.0 billion in aggregate principal amount of notes. The offering included $500 million of Floating Rate Notes due 2028, $1 billion of 4.300% Notes due 2028, $500 million of 4.650% Notes due 2031, $1 billion of 4.950% Notes due 2033, $1.5 billion of 5.200% Notes due 2036, $500 million of 5.750% Notes due 2046, and $1 billion of 5.850% Notes due 2056. These notes were issued under the Company’s Registration Statement on Form S-3ASR, originally filed on March 19, 2024, and subsequently amended. The issuance was made pursuant to an indenture dated January 6, 2010, between Merck & Co., Inc. and U.S. Bank Trust National Association, as trustee. The filing includes various exhibits detailing the officers' certificates for each series of notes and related legal opinions.