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Delaware court dismisses Tesaro's breach claim, upholds Anaptys' Jemperli royalty rights

Market News
24 Apr 2026
GlobeNewsWire
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The Delaware Chancery Court dismissed Tesaro's anticipatory breach of contract claim against AnaptysBio, affirming that Anaptys did not repudiate their Collaboration Agreement regarding Jemperli. The ruling preserves Anaptys' current royalty rates and rejects Tesaro's request for a royalty reduction. Anaptys alleges Tesaro breached key contract terms, including exclusivity and diligence duties, and is pursuing a trial scheduled for July 14-17, 2026, to resolve these claims and seek reversion rights to Jemperli. This decision supports Anaptys' efforts to protect its royalty stream and contractual rights against Tesaro and GSK.

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