Avantor, Inc. Securities Lawsuit Investigation

Shamis & Gentile P.A., one of the nation's premier class action law firms specializing in securities fraud cases, is investigating potential claims against Avantor, Inc. (AVTR)

If you purchased or held Avantor, Inc. securities between March 5, 2024 and October 28, 2025, you may be eligible to join this class action lawsuit and seek compensation for your losses.

About Avantor

Avantor is a life-science tools company headquartered in Radnor, Pennsylvania. Avantor is a provider of mission-critical products and services for customers in the biopharma, healthcare, education & government, and advanced technologies sectors.

The Allegations

The class action lawsuit alleges that Avantor and certain executives misled investors about the company’s competitive position and the impact of increased competition.

The complaint claims that Avantor made materially false and/or misleading statements and failed to disclose that:

• Avantor’s competitive positioning was weaker than publicly represented.
• The company was experiencing negative effects from increased competition.
• As a result, statements about Avantor’s business, operations, and prospects were materially false, misleading, and/or lacked a reasonable basis.

During the class period (March 5, 2024 to October 28, 2025), Avantor’s stock price experienced several sharp declines tied to disappointing financial results and downward revisions in guidance.

For example:

• On April 25, 2025, after reporting weak Q1 results and cutting its 2025 guidance, Avantor’s stock dropped over 16.5% in a single day.
• On August 1, 2025, following further disappointing Q2 results and another guidance cut, the stock fell more than 15%.
• On October 29, 2025, after the company disclosed a 5% organic revenue decline and a $785 million goodwill impairment linked to competitive pressures and lost accounts, shares dropped by more than 23%, from a close of $15.08 per share on October 28, 2025, to close at $11.58 per share on October 29, 2025.

These disclosures allegedly revealed previously concealed problems, resulting in significant losses for investors who purchased Avantor stock during the class period.

Important Dates

• Complaint filed: October 30, 2025
• Class period: March 5, 2024 to October 28, 2025
• Lead plaintiff deadline: December 29, 2025

Your Rights and Next Steps

If you purchased or otherwise acquired Avantor securities during the class period, you may have legal rights as a member of the proposed class.

As an investor, you can:

• Seek to be appointed as a lead plaintiff, which allows you to help direct the litigation on behalf of all class members.
• Remain a passive class member, in which case you may still receive a portion of any settlement or recovery if the lawsuit is successful.
• Consult with lawyers experienced in securities class actions to discuss your individual situation and next steps.

To participate, you do not need to have held your shares for the entire class period; any purchase during the relevant dates may qualify. Importantly, to be considered for the role of lead plaintiff, you must act before the December 29, 2025 deadline.

Lawyers are ready to help answer your questions, review your transactions, and guide you through the process. There is no cost to inquire or to join the case as a class member.

You May Be Entitled to Compensation

If you purchased or otherwise acquired Avantor securities between March 5, 2024 and October 28, 2025, you may be eligible to seek compensation for your losses.

To find out if you qualify and to take the next step, complete the form below to join the lawsuit and protect your rights.