X0206 3/A 2019-05-16 2019-05-16 0 0001722482 Avantor, Inc. AVTR 0001776172 Walker Corey RADNOR CORPORATE CENTER, BUILDING ONE, SUITE 200, 100 MATSONFORD ROAD RADNOR PA 19087 0 1 0 0 See Remarks Common Stock 70480 D Reflects restricted stock units. This Amendment is being filed to correct the number of restricted stock units reported in Table I of the original Form 3 filed by the Reporting Person on May 16, 2019. Title: EVP, Americas, Biomaterials and Advanced Technologies Scott Baker, as Attorney-in-Fact 2019-05-16