<SEC-DOCUMENT>0001628280-25-054305-index.html : 20251201
<SEC-HEADER>0001628280-25-054305.hdr.sgml : 20251201
<ACCEPTANCE-DATETIME>20251201081338
ACCESSION NUMBER:		0001628280-25-054305
CONFORMED SUBMISSION TYPE:	424B5
PUBLIC DOCUMENT COUNT:		3
FILED AS OF DATE:		20251201
DATE AS OF CHANGE:		20251201

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			Merck & Co., Inc.
		CENTRAL INDEX KEY:			0000310158
		STANDARD INDUSTRIAL CLASSIFICATION:	PHARMACEUTICAL PREPARATIONS [2834]
		ORGANIZATION NAME:           	03 Life Sciences
		EIN:				221918501
		STATE OF INCORPORATION:			NJ
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		424B5
		SEC ACT:		1933 Act
		SEC FILE NUMBER:	333-278066
		FILM NUMBER:		251537234

	BUSINESS ADDRESS:	
		STREET 1:		126 EAST LINCOLN AVENUE
		STREET 2:		P.O. BOX 2000
		CITY:			RAHWAY
		STATE:			NJ
		ZIP:			07065
		BUSINESS PHONE:		908-740-4000

	MAIL ADDRESS:	
		STREET 1:		126 EAST LINCOLN AVENUE
		STREET 2:		P.O. BOX 2000
		CITY:			RAHWAY
		STATE:			NJ
		ZIP:			07065

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	Merck & Co. Inc.
		DATE OF NAME CHANGE:	20091103

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	SCHERING PLOUGH CORP
		DATE OF NAME CHANGE:	19920703
</SEC-HEADER>
<DOCUMENT>
<TYPE>424B5
<SEQUENCE>1
<FILENAME>merck-preliminaryprospectu.htm
<DESCRIPTION>424B5
<TEXT>
Document 1 - file: merck-preliminaryprospectu.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>2
<FILENAME>formulaa.jpg
<TEXT>
Document 2 - file: formulaa.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>3
<FILENAME>mercka.jpg
<TEXT>
Document 3 - file: mercka.jpg

</DOCUMENT>
</SEC-DOCUMENT>