    <SEC-DOCUMENT>0000950170-25-046815-index.html : 20250328
    <SEC-HEADER>0000950170-25-046815.hdr.sgml : 20250328
    <ACCEPTANCE-DATETIME>20250328161904
    ACCESSION NUMBER:		0000950170-25-046815
    CONFORMED SUBMISSION TYPE:	DEFA14A
    PUBLIC DOCUMENT COUNT:		3
    FILED AS OF DATE:		20250328
    DATE AS OF CHANGE:		20250328

    FILER:

    	COMPANY DATA:
    		COMPANY CONFORMED NAME:			Avantor, Inc.
    		CENTRAL INDEX KEY:			0001722482
    		STANDARD INDUSTRIAL CLASSIFICATION:	LABORATORY ANALYTICAL INSTRUMENTS [3826]
    		ORGANIZATION NAME:           	08 Industrial Applications and Services
    		EIN:				822758923
    		FISCAL YEAR END:			1231

    	FILING VALUES:
    		FORM TYPE:		DEFA14A
    		SEC ACT:		1934 Act
    		SEC FILE NUMBER:	001-38912
    		FILM NUMBER:		25786580

    	BUSINESS ADDRESS:
    		STREET 1:		RADNOR CORPORATE CENTER, BUILDING ONE
    		STREET 2:		SUITE 200, 100 MATSONFORD ROAD
    		CITY:			RADNOR
    		STATE:			PA
    		ZIP:			19087
    		BUSINESS PHONE:		(610) 386-1700

    	MAIL ADDRESS:
    		STREET 1:		RADNOR CORPORATE CENTER, BUILDING ONE
    		STREET 2:		SUITE 200, 100 MATSONFORD ROAD
    		CITY:			RADNOR
    		STATE:			PA
    		ZIP:			19087

    	FORMER COMPANY:
    		FORMER CONFORMED NAME:	Avantor, Inc
    		DATE OF NAME CHANGE:	20190206

    	FORMER COMPANY:
    		FORMER CONFORMED NAME:	Vail Holdco Corp
    		DATE OF NAME CHANGE:	20171113
    </SEC-HEADER>
    <DOCUMENT>
    <TYPE>DEFA14A
    <SEQUENCE>1
    <FILENAME>avtr-na_2025.htm
    <DESCRIPTION>DEFA14A
    <TEXT>
    Document 1 - file: avtr-na_2025.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>2
    <FILENAME>img198531507_0.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 2 - file: img198531507_0.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>3
    <FILENAME>img198531507_1.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 3 - file: img198531507_1.jpg

    </DOCUMENT>
    </SEC-DOCUMENT>