Levi & Korsinsky notifies investors that it has commenced an investigation into Regeneron Pharmaceuticals, Inc. (NASDAQ: REGN) concerning potential violations of the federal securities laws.
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.
If you suffered a loss on your Regeneron Pharmaceuticals, Inc. securities and would like to explore a potential recovery under the federal securities laws, submit to us or contact Joseph E. Levi, Esq. via email at [email protected] or call 212-363-7500 to speak to our team of experienced shareholder advocates.
Please provide your address so we can contact you about your case if eligible.






Input your stock purchases and sales












Connect with SnapTrade to let us the stocks you own. This is an optional step to keep you. informed about class action litigation.
✓ Fast: takes less than a min
✓ We do not create an attorney-client relationship
✓ Your information is confidential & secure





