Introduction to the Aldeyra Therapeutics Class Action Lawsuit

  • Captioned Kirby v. Aldeyra Therapeutics, Inc., No. 26-cv-11510 (D. Mass.), the Aldeyra Therapeutics class action lawsuit charges Aldeyra Therapeutics and certain of Aldeyra Therapeutics’ top current and former executive officers with violations of the Securities Exchange Act of 1934.

Read on for answers to the eight most frequently asked questions from investors.

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1. What Do I Need to Know about the Aldeyra Therapeutics Class Action Lawsuit?

2. How Does the Aldeyra Therapeutics Class Action Lawsuit Work?

  • A lawsuit is initiated by one or more investors, called the “lead plaintiffs,” on behalf of a larger group of investors, or the “class”.
  • The “class period” is defined as the specific timeframe during which the alleged fraudulent activity took place. Only those who bought or sold the security during this period are eligible to participate.
  • The case is litigated, which may include a lengthy discovery phase for gathering evidence.

3. What Do Plaintiffs Have to Prove in the Aldeyra Therapeutics Class Action Lawsuit?

To succeed in a federal securities fraud class action, plaintiffs must prove several elements:

  • Reliance: The plaintiff relied on the misstatement or omission when buying or selling the security. For publicly traded securities, this can be proven through the “fraud-on-the-market” theory, which presumes the market price reflects all public, material information.

4. What Are the Allegations in the Aldeyra Therapeutics Class Action Lawsuit?

Aldeyra Therapeutics is a biotechnology company that discovers and develops therapies designed to treat immune-mediated diseases.  Its lead product candidate is reproxalap, a reactive aldehyde species (RASP) modulator, which is in Phase III clinical trial for the treatment of dry eye disease and allergic conjunctivitis.

The Aldeyra Therapeutics class action lawsuit alleges that defendants throughout the Class Period made false and/or misleading statements and/or failed to disclose that:

  • The results of the reproxalap clinical trials were inconsistent; and
  • The inconsistency of the results rendered any positive findings from these trials unreliable and not meaningful.

The Aldeyra Therapeutics class action lawsuit further alleges that March 17, 2026, Aldeyra Therapeutics disclosed that it received a Complete Response Letter which stated that the “‘inconsistency of study results raises serious concerns about the reliability and meaningfulness of the positive findings’” and that “‘the totality of evidence from the completed clinical trials does not support the effectiveness of the product.’”  On this news, the price of Aldeyra Therapeutics stock fell more than 70%, according to the Aldeyra Therapeutics class action lawsuit.

Fraud Investigation - examining evidence to determine if a fraud occurred, text concept background used in Aldeyra Therapeutics Class Action Lawsuit

5. What Rights to Investors Have in the Aldeyra Therapeutics class action lawsuit?

Investors affected by the Aldeyra Therapeutics class action lawsuit possess specific rights that they can exercise. Understanding these rights is vital for anyone considering involvement in the Aldeyra Therapeutics class action lawsuit.

Right to Information

Right to Participate

Right to Legal Representation

  • Legal professionals can provide guidance and support throughout the process.

6. What Damages Am I Entitled To in the Aldeyra Therapeutics class action lawsuit?