MRK: 8-K company filing

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported) May 28, 2026 ( May 26, 2026 ) Merck & Co., Inc. (Exact name of registrant as specified in its charter) New Jersey (State or other jurisdiction of incorporation) 1-6571 (Commission File Number) 22-1918501 (I.R.S. Employer Identification No.) 126 East Lincoln Avenue , Rahway , NJ (Address of principal executive offices) 07065 (Zip Code) ( 732 ) 594-4000 Registrant’s telephone number, including area code Not Applicable (Former name or former address, if changed since last report.) Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions: ¨ Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425) ¨ Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12) ¨ Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b)) ¨ Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c)) Securities registered pursuant to Section 12(b) of the Act: Title of each class Trading Symbol(s) Name of each exchange on which registered Common Stock ($0.50 par value) MRK New York Stock Exchange 1.875% Notes due 2026 MRK/26 New York Stock Exchange 3.250% Notes due 2032 MRK/32 New York Stock Exchange 2.500% Notes due 2034 MRK/34 New York Stock Exchange 1.375% Notes due 2036 MRK 36A New York Stock Exchange 3.500% Notes due 2037 MRK/37 New York Stock Exchange 3.700% Notes due 2044 MRK/44 New York Stock Exchange 3.750% Notes due 2054 MR