Avantor Inc. (AVTR) Securities Class Action Lawsuit

Shamis & Gentile, P.A. reminds investors of the upcoming lead plaintiff deadline of December 29, 2025, in the class action filed on behalf of investors who purchased or otherwise acquired Avantor, Inc. (“Avantor” or the “Company”) (AVTR) securities between March 5, 2024 and October 28, 2025 (the “Class Period”).

Investors who purchased Avantor (AVTR) securities during the Class Period may be eligible to serve as lead plaintiff. Investors suffering losses in excess of $100,000 are advised to contact the firm now for more information on how to participate. The deadline to apply for lead plaintiff is December 29, 2025.

The class action lawsuit alleges that Avantor and certain executives misled investors about the Company’s competitive position and the impact of increased competition on its business and financial performance. Plaintiffs claim that throughout the Class Period, the Company emphasized strong demand, stable market share, and positive guidance while concealing adverse facts about weakening customer relationships, pricing pressure, and lost accounts in key end markets. The complaint further alleges that Avantor’s assurances regarding its revenue outlook and profitability were misleading because internal data already reflected declining sales and a deteriorating competitive environment.

The complaint contends the “truth” began to emerge through a series of disappointing earnings reports. On April 25, 2025, Avantor’s stock fell over 16% after weak first-quarter results and reduced guidance. On August 1, 2025, the stock dropped another 15% following additional guidance cuts. Finally, on October 29, 2025, Avantor disclosed a 5% organic revenue decline and a $785 million goodwill impairment tied to competitive pressures.

On this news, shares of Avantor fell $3.50 per share, or approximately 23%, from a close of $15.08 per share on October 28, 2025, to close at $11.58 per share on October 29, 2025.

Investors who purchased Avantor (AVTR) securities during the Class Period may have important legal rights and are encouraged to act promptly. The deadline to seek appointment as lead plaintiff is December 29, 2025.

Shamis & Gentile, P.A. stands out as an advocate for investors who are victims of securities fraud. The firm is committed to securing recoveries for investors who have incurred damages due to false and misleading statements or other corporate misconduct by public companies. Shamis & Gentile has recovered over $1 billion for consumers nationwide. Its extensive experience, expertise and resources enable the firm to resolve disputes in a wide range of matters, including class actions, mass torts and mass arbitrations.

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