1、UNITED STATESSECURITIES AND EXCHANGE COMMISSIONWashington,D.C.20549FORM 10-Q QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d)OF THE SECURITIES EXCHANGE ACT OF 1934For the quarterly period ended September 30,2025 OR TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d)OF THE SECURITIES EXCHANGE ACT OF 19

2、34For the transition period from _ to _Commission File No.1-6571 Merck&Co.,Inc.(Exact name of registrant as specified in its charter)New Jersey22-1918501(State or other jurisdiction of incorporation)(I.R.S.Employer Identification No.)126 East Lincoln AvenueRahwayNew Jersey07065(Address of principal

3、executive offices)(zip code)(Registrants 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 classTrading Symbol(s)Name of each exchan

4、ge on which registeredCommon Stock($0.50 par value)MRKNew York Stock Exchange1.875%Notes due 2026MRK/26New York Stock Exchange3.250%Notes due 2032MRK/32New York Stock Exchange2.500%Notes due 2034MRK/34New York Stock Exchange1.375%Notes due 2036MRK 36ANew York Stock Exchange3.500%Notes due 2037MRK/37

5、New York Stock Exchange3.700%Notes due 2044MRK/44New York Stock Exchange3.750%Notes due 2054MRK/54New York Stock ExchangeIndicate 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 mo

6、nths(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 every Interactive Data File required to be submitted pursua