Avantor Inc

Securities Trading Plans of Directors and Executive Officers

Our directors and officers (as defined in Exchange Act Rule 16a-1(f)) may from time to time enter into plans or other arrangements for the purchase or sale of our shares that are intended to satisfy the affirmative defense conditions of Rule 10b5–1(c) of the Exchange Act. During the quarter ended March 31, 2024, the following plans or arrangements were adopted:

On March 7, 2024, Christophe Couturier, Executive Vice President, AMEA adopted a Rule 10b5-1 trading plan (a “Plan”) pursuant to which he may sell up to (i)265,605 shares of the Company's common stock through the exercise of stock options and (ii)20,000 shares of the Company’s common stock, in each case, in amounts and at prices as determined in accordance with the plan terms. The Plan will terminate on the earlier of April 30, 2025, or the execution of all trades contemplated by the Plan.

On March 8, 2024, James Bramwell, Executive Vice President, Sales and Customer Excellence, adopted a Plan pursuant to which he may sell up to (i)207,415 shares of the Company's common stock through the exercise of stock options and (ii)43,867 shares of the Company’s common stock, in each case, in amounts and at prices as determined in accordance with the plan terms. The Plan will terminate on the earlier of March 14, 2025, or the execution of all trades contemplated by the Plan.

No other directors or officers, as defined in Rule 16a-1(f) of the Securities Exchange Act of 1934, of the Company adopted orterminated (i) a Rule 10b5-1 trading arrangement, as defined in Item 408(a) under Regulation S-K of the Securities Act of 1933, or (ii) a non-Rule 10b5-1 trading arrangement, as defined in Item 408(c) under Regulation S-K of the Securities Act of 1933, during the three months ended March 31, 2024.