Day One Completes Acquisition of Mersana Therapeutics, Adding Novel ADC to Pipeline
ByAinvest
Tuesday, Jan 6, 2026 9:04 am ET1min read
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Day One Biopharmaceuticals has completed its acquisition of Mersana Therapeutics at $25 per share in cash, plus one non-tradable CVR per share for potential milestone payments of up to $30.25. The acquisition adds a second novel ADC to Day One's clinical pipeline and expands its position in adult oncology while maintaining a focus on rare cancers. The acquired asset, Emi-Le, represents a potentially transformative advancement in treating adenoid cystic carcinoma.
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