Regeneron Pharmaceuticals, Inc. Investigation - REGN

Company: Regeneron Pharmaceuticals, Inc.

Ticker: (NASDAQ) REGN

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By your signature above, you confirm that have retained Levi & Korsinsky, LLP to represent you and the shareholder class as a lead plaintiff in the pending class action against Regeneron Pharmaceuticals, Inc. This representation will be on a contingency basis, meaning that Levi & Korsinsky will advance all expenses in the litigation and will only seek compensation and/or reimbursement of expenses if the firm obtains a recovery. Regardless of the result, we will never ask you to directly pay for any attorneys’ fees, expenses, or costs. Should we obtain a favorable result, we may ask the court to award us compensation and reimbursement of expenses to be paid by the defendants or as a portion of any class recovery. In exchange for our representation, you agree to cooperate as our client by providing, for example, relevant documents and deposition testimony, if necessary. During the course of this litigation, we may employ and/or work with other law firms, experts, and third-parties to successfully prosecute this action. If you are not appointed as the lead plaintiff or Levi & Korsinsky is not appointed as lead counsel, we will notify you of such decision at which time this representation will end unless otherwise extended by you and the firm. We look forward to working with you towards a successful resolution of this action.

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Investigation Details

In March, the Senior Vice President of Investor Relations, Ryan Crowe, told investors management was “hopeful” for the LAG-3 study to show positive differentiators for Fianlimab in combination with Libtayo, such as a low to mid-teens median PFS” and an “opportunity to have … a statistically significant, clinically meaningful benefit on OS.”

A little more than two months later, on May 16, 2026, Regeneron disclosed that fianlimab + Libtayo did not meet the trial’s primary endpoint against Keytruda. The upbeat language on potential outcomes offered on March 10, 2026 failed to stress the risk of the trial failure. The stock fell sharply on the revelation.