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Form 8-K/A

sec.gov

8-K/A — Avantor, Inc.

Accession: 0001628280-26-059273

Filed: 2026-08-27

Period: 2026-04-17

CIK: 0001722482

SIC: 3826 (LABORATORY ANALYTICAL INSTRUMENTS)

Item: Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers: Compensatory Arrangements of Certain Officers

Item: Financial Statements and Exhibits

Documents

8-K/A — avtr-20260417.htm (Primary)

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UNITED STATES SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K/A

CURRENT REPORT

Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

Date of Report (Date of earliest event reported): April 17, 2026

Avantor, Inc.

(Exact name of registrant as specified in its charter)

Delaware 001-38912 82-2758923

(State or other jurisdiction of incorporation) (Commission File Number) (I.R.S. Employer Identification No.)

Radnor Corporate Center, Building One, Suite 200

100 Matsonford Road

Radnor, Pennsylvania 19087

(Address of principal executive offices, including zip code)

(610) 386-1700

(Registrant’s telephone number, including area code)

Not Applicable

(Former name or former address, if changed since last report)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

☐    Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

☐    Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

☐    Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

☐    Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act:

Title of each class Trading Symbol Exchange on which registered

Common Stock, $0.01 par value AVTR New York Stock Exchange

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter). ☐ Emerging growth company

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

Item 5.02.    Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers.

On April 23, 2026, Avantor, Inc. (the “Company”) filed a Current Report on Form 8-K (the “Original 8-K”) disclosing that Benoit Gourdier, the Company’s Executive Vice President, Bioscience and Medtech Products, would transition to a new role supporting the Company’s segment integration activities for a period of time, after which he would depart the Company. The Original 8-K did not include Mr. Gourdier’s departure date because, at the time, his departure date had not been determined. This Form 8-K/A is being filed for the purpose of providing Mr. Gourdier’s departure date.

On August 21, 2026, the Company, through its subsidiary VWR International, LLC, and Mr. Gourdier agreed to a transition arrangement (the “Transition Agreement”), pursuant to which Mr. Gourdier will continue his employment with the Company through October 14, 2026, after which his employment will end. If Mr. Gourdier remains employed and complies with the terms of the Transition Agreement until October 14, 2026, he will be entitled to receive severance benefits materially consistent with the terms of the Company’s Executive Severance and Change in Control Plan, which are described in the Company’s proxy statement filed with the Securities and Exchange Commission on March 27, 2026.

Item 9.01.    Financial Statements and Exhibits.

(d) Exhibits

Exhibit No. Description

104 The cover page from this Current Report on Form 8-K/A, formatted in Inline XBRL

SIGNATURE

Pursuant to the requirements of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

Avantor, Inc.

Date: August 27, 2026 By: /s/ Claudius Sokenu

Name: Claudius Sokenu

Title: Executive Vice President, Chief Legal and Compliance Officer and Secretary (Duly Authorized Officer)

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Apr. 17, 2026

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Entity File Number

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Entity Tax Identification Number

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Entity Address, Address Line One

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