Avantor, Inc. — Director's Dealing 2019

May 24, 2019

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: Avantor, Inc. (AVTR)
CIK: 0001722482
Period of Report: 2019-05-21

Reporting Person: New Mountain Investments III, LLC (10% Owner)
Reporting Person: New Mountain Partners III LP (10% Owner)
Reporting Person: New Mountain Capital, L.L.C. (10% Owner)
Reporting Person: New Mountain Capital Group, L.P. (10% Owner)
Reporting Person: NM Holdings GP, L.L.C. (10% Owner)
Reporting Person: KLINSKY STEVEN B (10% Owner)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2019-05-21	Common Stock	S	100	$14.00	Disposed	110477989	Indirect

Footnotes

F1: These securities are directly held by New Mountain Partners III, L.P. The general partner of New Mountain Partners III, L.P. is New Mountain Investments III, L.L.C. and the manager of New Mountain Partners III, L.P. is New Mountain Capital, L.L.C. Steven B. Klinsky is the managing member of New Mountain Investments III, L.L.C. The managing member of New Mountain Capital, L.L.C. is New Mountain Capital Group, L.P. The general partner of New Mountain Capital Group, L.P. is NM Holdings GP, L.L.C. Steven B. Klinsky is the managing member of NM Holdings GP, L.L.C. Each of the Reporting Persons disclaims beneficial ownership of the securities reported herein, except to the extent of such Reporting Person's pecuniary interest therein. The filing of this statement shall not be deemed to be an admission that, for purposes of Section 16 of the Securities Exchange Act of 1934 or otherwise, the Reporting Persons are the beneficial owners of any securities reported herein.