1、As filed with the Securities and Exchange Commission on February27,2019UNITED STATESSECURITIES AND EXCHANGE COMMISSIONWASHINGTON,D.C.20549_FORM10-K(MARK ONE)Annual Report Pursuant to Section13 or 15(d)of the Securities Exchange Act of 1934For the Fiscal Year Ended December 31,2018orTransition Report
2、 Pursuant to Section13 or 15(d)of the Securities Exchange Act of 1934For the transition period from to Commission File No.1-6571_Merck&Co.,Inc.2000 Galloping Hill RoadKenilworth,N.J.07033(908)740-4000Incorporated in New JerseyI.R.S.EmployerIdentification No.22-1918501Securities Registered pursuant t
3、o Section12(b)of the Act:Title of Each ClassName of Each Exchange on which RegisteredCommon Stock($0.50par value)New York Stock Exchange1.125%Notes due 2021New York Stock Exchange0.500%Notes due 2024New York Stock Exchange1.875%Notes due 2026New York Stock Exchange2.500%Notes due 2034New York Stock
4、Exchange1.375%Notes due 2036New York Stock ExchangeNumber of shares of Common Stock($0.50par value)outstanding as of January31,2019:2,581,220,308.Aggregate market value of Common Stock($0.50par value)held by non-affiliates on June30,2018 based on closing price on June30,2018:$161,991,000,000.Indicat
5、e by check mark if the registrant is a well-known seasoned issuer,as defined in Rule405 of the Securities Act.YesNoIndicate by check mark if the registrant is not required to file reports pursuant to Section13 or Section15(d)of the Act.YesNoIndicate by check mark whether the registrant(1)has filed a
6、ll reports required to be filed by Section13 or 15(d)of the Securities ExchangeAct of 1934 during the preceding 12months(or for such shorter period that the registrant was required to file such reports),and(2)has been subjectto such filing requirements for the past 90days.YesNoIndicate by check mark