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UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington , D.C. 20549 FORM 10 - K ANNUAL REPORT PURSUANT TO SECTION 13 OR 15 ( d ) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31 , 2020 TRANSITION REPORT PURSUANT TO SECTION 13 OR 15 ( d ) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number : 001-38912 Navantor ™ Avantor , Inc. ( Exact name of registrant as specified in its charter ) Delaware ( State or other jurisdiction of incorporation or organization ) Radnor Corporate Center , Building One , Suite 200 100 Matsonford Road 82-2758923 ( I.R.S. employer identification no . ) Radnor , Pennsylvania 19087 ( Address of principal executive offices ) ( zip code ) Securities registered pursuant to Section 12 ( b ) of the Act : 610 386-1700 ( Registrant's telephone number , including area code ) Title of each class Common stock , $ 0.01 par value 6.250 % Series A Mandatory Convertible Preferred Stock , $ 0.01 par value Trading symbol AVTR AVTR PRA Exchange on which registered New York Stock Exchange New York Stock Exchange Securities registered pursuant to Section 12 ( g ) of the Act : None