The law firm of Kirby McInerney LLP announces that a class action lawsuit has been filed on behalf of investors who acquired Avantor, Inc. (“Avantor” or the “Company”) (NYSE: AVTR) securities during the period of March 5, 2024 through October 28, 2025, inclusive (“the Class Period”).

If you suffered a loss on your Avantor investments, you have until December 29, 2025 to request lead plaintiff appointment. For more information:

[CONTACT THE FIRM IF YOU SUFFERED A LOSS]

What Is This Lawsuit About? The lawsuit alleges that Avantor made materially false and/or misleading statements, as well as failed to disclose material adverse facts, about the Company’s business and operations. Specifically, Avantor misrepresented and/or failed to disclose that: (1) Avantor’s competitive positioning was weaker than it had publicly represented and (2) Avantor was experiencing negative effects from increased competition.

On April 25, 2025, the Company reported first quarter 2025 financial results, cut its guidance for 2025, and announced that the President and Chief Executive Officer, Mr. Stubblefield, would be stepping down. Avantor attributed its weak performance and outlook to “the impact of increased competitive intensity.” On this news, the price of Avantor shares declined by $2.57, or approximately 16.5%, from $15.50 per share on April 24, 2025 to close at $12.93 per share on April 25, 2025.

Then, on August 1, 2025, the Company reported disappointing second quarter 2025 financial results, including a year-over-year decrease in net sales, and further reduced the Company’s 2025 guidance. Avantor again attributed its poor results and outlook to “increased competitive intensity,” and further admitted that the Company did not expect the competitive environment to materially improve in the remainder of 2025 and weak performance would therefore likely persist. On this news, the price of Avantor shares declined by $2.08 per share, or approximately 15.48%, from $13.44 per share on July 31, 2025 to close at $11.36 per share on August 1, 2025.

Then, on October 29, 2025, the Company reported weak third quarter 2025 financial results, including -5% organic revenue growth (below the guidance Avantor had provided in August), and a net loss of $712 million, which Avantor primarily attributed to a non-cash goodwill impairment charge of $785 million. Avantor revealed that the impairment charge was necessary due in part to “competitive pressures” that had “meaningfully impacted” the Company’s margins, and further admitted that the Company had lost several large accounts. On this news, the price of Avantor shares declined by $3.50 per share, or approximately 23.2%, to close at $15.08 per share on October 28, 2025 to close at $11.58 per share on October 29, 2025.

[LEARN MORE ABOUT THE LAWSUIT]

The Lead Plaintiff Appointment Process. The federal securities laws permit any investor who acquired eligible securities during the class period to seek appointment as lead plaintiff in a class action lawsuit. Courts typically appoint the investor(s) with the largest financial loss in the case and the ability to represent the class rather than investors with simply the largest investment portfolio. Courts regularly appoint individual investors, whether acting alone or as a group, as lead plaintiffs. The rights of any investor who bought shares during the class period are generally already protected. However, lead plaintiffs have the power to influence case strategy and have a say in settlement decisions, as well as decisions concerning allocation of settlement funds among class members.

[LEARN MORE ABOUT THE LEAD PLAINTIFF PROCESS]

What Should I Do? If you purchased or otherwise acquired Avantor securities, have information, or would like to learn more about this investigation, please contact Lauren Molinaro of Kirby McInerney LLP by email at investigations@kmllp.com, or fill out the contact form below, to discuss your rights or interests with respect to these matters at no cost.

Kirby McInerney LLP is a New York-based plaintiffs’ law firm concentrating in securities, antitrust, whistleblower, and consumer litigation. The firm’s efforts on behalf of shareholders in securities litigation have resulted in recoveries totaling billions of dollars. Additional information about the firm can be found at Kirby McInerney LLP’s website.

This press release may be considered Attorney Advertising in some jurisdictions under the applicable law and ethical rules.

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