144 0001748813 XXXXXXXX LIVE 0001722482 Avantor, Inc. 001-38912 RADNOR CORPORATE CENTER, BUILDING ONE SUITE 200, 100 MATSONFORD ROAD RADNOR PA 19087 (610) 386-1700 Eck Steven W Officer Common Merrill

8890 Lyra Drive 5th Floor Columbus OH 43240

3685 95000.00 678281383 03/08/2024 NYSE Common 02/20/2024 Restricted Stock Grant Vest Avantor Inc N 891 02/20/2024 na Common 02/23/2024 Restricted Stock Grant Vest Avantor Inc N 863 02/23/2024 na Common 02/24/2024 Restricted Stock Grant Vest Avantor Inc N 898 02/24/2024 na Common 02/25/2024 Restricted Stock Grant Vest Avantor Inc N 1033 02/25/2024 na Y 03/12/2024 12/08/2023 Steven Eck