Executive Vice President — Benoit Gourdier: The filing confirms the departure of an Executive Vice President with a defined end date and severance, representing a genuine loss of a senior officer but not a sudden shock to the top leadership (CEO/CFO).

Results of Operations and Financial Condition. On July 29, 2026, Avantor, Inc. issued a press release announcing its financial results for the quarter ended June 30, 2026. A copy of the press release is attached hereto as Exhibit 99.1 and is incorporated herein by reference. The information contained in this Form 8-K (including Exhibit 99.1) shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, nor shall it be deemed incorporated by reference in any fi…

Creation of a Direct Financial Obligation under an Off-Balance Sheet Arrangement of Registrant. The information set forth in

Entry into a Material Definitive Agreement On July 14, 2026 (the “Effective Date”), Avantor Funding, Inc. (the “Borrower”), a wholly owned subsidiary of Avantor, Inc. (the “Company”), entered into Amendment No. 15 to Credit Agreement (the “Credit Agreement Amendment”), which amended that certain Credit Agreement, originally dated as of November 21, 2017 (as amended, restated, extended, supplemented or otherwise modified in writing from time to time prior to the Effective Date, the “Credit Agr…

Results of Operations and Financial Condition. On April 29, 2026, Avantor, Inc. issued a press release announcing its financial results for the quarter ended March 31, 2026. A copy of the press release is attached hereto as Exhibit 99.1 and is incorporated herein by reference. The information contained in this Form 8-K (including Exhibit 99.1) shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, nor shall it be deemed incorporated by reference in any…

Executive Vice President, Bioscience and Medtech Products — Benoit Gourdier: Benoit Gourdier is transitioning to a new role and expected to depart the company by December 31, 2026.

CFO — Mr. R. Brent Jones: Mr. R. Brent Jones resigned as CFO to join another company.

Director — Simon Dingemans: Election of Simon Dingemans as a director and his appointment to the Audit & Finance Committee.

Director — Sanjeev Mehra: Election of Sanjeev Mehra as a director and appointment to committees.

above, which also announced a realignment of the Company’s reportable business segments. The Company will hold a conference call to discuss these developments and its financial results for the quarter and year ended December 31, 2025 at 8:00 a.m. ET on February 11, 2026. Effective in the first quarter of 2026, the Company is realigning its business units into two reportable segments: VWR Distribution & Services and Bioscience & Medtech Products. To assist investors in understanding the effect…

Director — Simon Dingemans: The filing discloses the election of a new director to fill a vacancy created by a previously disclosed resignation, which is a standard board succession event.

Director — Sanjeev Mehra: The filing discloses the election of a new independent director to the board, which is a routine governance event and not a departure of a senior executive.

COO — Mary Blenn: The filing announces the appointment of an external candidate as Chief Operating Officer, which is a significant leadership addition rather than a departure.

Results of Operations and Financial Condition. On October 29, 2025, Avantor, Inc. issued a press release announcing its financial results for the quarter ended September 30, 2025. A copy of the press release is attached hereto as Exhibit 99.1 and is incorporated herein by reference. The information contained in this Form 8-K (including Exhibit 99.1) shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, nor shall it be deemed incorporated by reference i…

Chairman and Director — Jonathan Peacock: Jonathan Peacock is stepping down as the chairman and a member of the Board of Directors.

Entry into a Material Definitive Agreement. Senior Secured Credit Facilities Amendment On October 9, 2025, Avantor Funding, Inc. (the “Borrower”), a wholly-owned subsidiary of Avantor, Inc. (the “Company”), certain other subsidiaries of the Company, the lenders party thereto, and Goldman Sachs Bank USA, as administrative agent and collateral agent, entered into Amendment No. 14 to Credit Agreement (the “Amendment”), which amends the Credit Agreement dated as of November 21, 2017, as previousl…

Creation of a Direct Financial Obligation under an Off-Balance Sheet Arrangement of Registrant. The information set forth in

Termination of a Material Agreement. PNC A/R Facility Termination On October 9, 2025 (the “Termination Date”), certain subsidiaries of the Company entered into an Assignment and Termination Agreement (the “Termination Agreement”) with PNC Bank, National Association (the “Bank”), as administrator, purchaser agent, related committed purchaser, LC bank and LC participant, and Wells Fargo Bank, National Association, as purchaser agent, related committed purchaser and LC participant, pursuant to w…

Director — Gregory Lucier: Gregory Lucier was elected as a director of Avantor, Inc.

Director — Emmanuel Ligner: The filing discloses the election of a new director to fill a vacant seat, which is a routine board composition update rather than a departure of a sitting executive.

Results of Operations and Financial Condition. On August 1, 2025, Avantor, Inc. issued a press release announcing its financial results for the quarter ended June 30, 2025. A copy of the press release is attached hereto as Exhibit 99.1 and is incorporated herein by reference. The information contained in this Form 8-K (including Exhibit 99.1) shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, nor shall it be deemed incorporated by reference in any f…

CEO — Michael Stubblefield: The filing announces the planned departure of CEO Michael Stubblefield with a named successor, Emmanuel Ligner, indicating an orderly succession rather than a sudden loss of leadership.

CFO — R. Brent Jones: The filing discloses the adoption of a severance policy and retention awards, which are compensatory arrangements rather than an actual departure or appointment of an executive.

CEO — Michael Stubblefield: The CEO has agreed to step down from his role, representing a significant loss of senior leadership even though a transition period is planned.

Results of Operations and Financial Condition. On April 25, 2025, Avantor, Inc. issued a press release announcing its financial results for the quarter ended March 31, 2025. A copy of the press release is attached hereto as Exhibit 99.1 and is incorporated herein by reference. The information contained in this Form 8-K (including Exhibit 99.1) shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, nor shall it be deemed incorporated by reference in any…