[8-K] Avantor, Inc. Reports Material Event

Rhea-AI Filing Summary

Avantor (AVTR) announced a planned board leadership transition. Jonathan Peacock will step down as chairman, director, and Nominating and Governance Committee member on December 31, 2025. The company stated his decision was not due to any disagreement regarding operations, policies, or practices. Current board member Gregory L. Summe will serve as the next chairman starting January 1, 2026.

The company furnished a press release under Regulation FD as Exhibit 99.

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UNITED STATES SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

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

Date of Report (Date of earliest event reported): October 10, 2025

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 October 10, 2025, Jonathan Peacock informed Avantor, Inc. (the “Company”) that he will step down as the Company’s chairman, member of the Board of Directors (the “Board”) and member of the Nominating and Governance Committee on December 31, 2025. Mr. Peacock’s decision to step down from the Board was not a result of any disagreement with the Company on any matter relating to the Company’s operations, policies or practices.

Item 7.01.    Regulation FD Disclosure.

On October 13, 2025, the Company issued a press release announcing that Mr. Peacock informed the Company of his decision to step down from the Board on December 31, 2025, and that current Board member, Gregory L. Summe, will serve as the Company’s next chairman from January 1, 2026. A copy of the press release is furnished herewith as Exhibit No. 99 to this Current Report on Form 8-K, and shall not be deemed filed for the purposes of Section 18 of the Exchange Act, or otherwise subject to the liabilities of that section and shall not be deemed to be incorporated by reference into any filing by the Company under the Securities Act of 1933, as amended, or the Exchange Act, except as shall be expressly set forth by specific reference in such a filing.

Item 9.01.    Financial Statements and Exhibits.

(d) Exhibits.

Exhibit No.						Description
99						Press Release, dated October 13, 2025
104						The cover page from this Current Report on Form 8-K, 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: October 14, 2025			By:			/s/ Claudius Sokenu
						Name:			Claudius Sokenu
						Title:			Executive Vice President, Chief Legal and Compliance Officer and Corporate Secretary (Duly Authorized Officer)

FAQ

What board change did Avantor (AVTR) disclose?

Avantor reported that Jonathan Peacock will step down as chairman and director on December 31, 2025.

Was there any disagreement related to Jonathan Peacock’s departure?

The company stated the decision was not due to any disagreement on operations, policies, or practices.

Who will be Avantor’s next chairman and when is it effective?

Gregory L. Summe will become chairman effective January 1, 2026.

Which items of the 8-K cover this update?

The leadership change is reported under Item 5.02, with a related press release furnished under Item 7.01.

What exhibit was included with the disclosure?

A press release was furnished as Exhibit 99.

What committee role is Jonathan Peacock leaving?

He will step down from the Nominating and Governance Committee.