1、As filed with the Securities and Exchange Commission on February 26,2016UNITED STATESSECURITIES AND EXCHANGE COMMISSIONWASHINGTON,D.C.20549_FORM 10-K(MARK ONE)Annual Report Pursuant to Section 13 or 15(d)of the Securities Exchange Act of 1934For the Fiscal Year Ended December 31,2015orTransition Rep
2、ort Pursuant to Section 13 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 Jersey I.R.S.EmployerIdentification No.22-1918501Securities Registered pursu
3、ant to Section 12(b)of the Act:Title of Each Class Name of Each Exchangeon which RegisteredCommon Stock($0.50 par value)New York Stock Exchange1.125%Notes due 2021New York Stock Exchange1.875%Notes due 2026New York Stock Exchange2.500%Notes due 2034New York Stock ExchangeNumber of shares of Common S
4、tock($0.50 par value)outstanding as of January 31,2016:2,775,258,591.Aggregate market value of Common Stock($0.50 par value)held by non-affiliates on June 30,2015 based on closing price on June 30,2015:$160,710,000,000.Indicate by check mark if the registrant is a well-known seasoned issuer,as defin
5、ed in Rule 405 of the Securities Act.Yes No Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15(d)of the Act.Yes No Indicate by check mark whether the registrant(1)has filed all reports required to be filed by Section 13 or 15(d)of the Securi
6、ties 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 and pos