Mersana Therapeutics (MRSN) Skyrockets: What’s Fueling the Surge?
Biotech's rollercoaster ride: MRSN shares defy gravity today.
Clinical Catalyst: Investors cheer pipeline progress—or just chasing the next meme stock high?
Short Squeeze Alert: Bears scramble as retail traders pile in. Déjà vu of 2021 or sustainable momentum?
Wall Street's Whisper: Analysts debate whether this is a breakthrough rally or another 'buy the rumor, sell the news' biotech special.
Closing Thought: In a sector where 90% of pipelines fail, today's winners often become tomorrow's tax write-offs—but for now, the party's on.
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Under the terms of the deal, Day One Biopharmaceuticals will make a tender offer of $25 per share in cash for MRSN stock and also include a possible $30.25 per share in cash in contingent value rights. The contingent value rights will be paid to MRSN shareholders if certain clinical development, regulatory, and commercial milestones are met.
The Mersana Therapeutics and Day One Biopharmaceuticals Boards of Directors have given their unanimous support to the deal. A tender offer for MRSN stock will take place within 10 days of the Nov. 12 deal announcement, with the merger set to close by the end of January 2026. Investors who hold 8.5% of the company’s shares have already agreed to tender their shares to Day One Biopharmaceuticals.
Mersana Therapeutics Stock Movement Today
Mersana Therapeutics stock was up 202.14% in pre-market trading on Thursday, following a slight dip yesterday. The shares have fallen 75.19% year-to-date and 85.92% over the past 12 months.
Today’s merger news has attracted traders to MRSN stock, bringing with it heavy trading. This had more than 684,000 shares traded this morning, compared to a three-month daily average trading volume of about 62,000 units.

Is Mersana Therapeutics Stock a Buy, Sell, or Hold?
Turning to Wall Street, the analysts’ consensus rating for Mersana Therapeutics is Strong Buy, based on four Buy ratings over the past three months. With that comes an average MRSN stock price target of $40, representing a potential 350.96% upside for the shares.
