Mersana Therapeutics announces 1-for-25 reverse stock split

Mersana Therapeutics (MRSN) announced that it will implement a 1-for-25 reverse stock split of the issued shares of the company’s common stock, effective at 5:00 p.m. Eastern Time on July 25, 2025. The Reverse Stock Split was approved by the company’s stockholders at the company’s Annual Meeting of Stockholders held on June 12, 2025, with the final ratio subsequently determined by the company’s Board of Directors. One of the primary goals of the Reverse Stock Split is to increase the per-share market price of the company’s common stock to enable the company to regain compliance with the minimum bid price requirement for continued listing on the Nasdaq Global Select Market. The company’s common stock is expected to begin trading on a split-adjusted basis when the markets open on July 28, 2025 under the company’s existing ticker “MRSN” with the new CUSIP number 59045L 205.