MRK: 10-Q financial filing

mrk-20260930 UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2026 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. (Exact name of registrant as specified in its charter) New Jersey 22-1918501 (State or other jurisdiction of incorporation) (I.R.S. Employer Identification No.) 126 East Lincoln Avenue Rahway New Jersey 07065 (Address of principal executive offices) (zip code) (Registrant’s telephone number, including area code) (908) 740-4000 Not Applicable (Former name, former address and former fiscal year, if changed since last report.) 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 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 MRK/54 New York Stock Exchange Indicate by check mark whether the registrant: (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days. Yes ☒ No ☐ Indicate by check mark whether the registrant has submitted electronically