GSK's Tesaro Files Lawsuit Against AnaptysBio, Endangering Jemperli Royalties for Cancer Treatment
Written by Emily J. Thompson, Senior Investment Analyst
Updated: Nov 21 2025
0mins
Should l Buy GSK?
Source: Benzinga
Litigation Initiation: GSK's subsidiary, Tesaro Inc., has filed a lawsuit against AnaptysBio in Delaware, claiming a breach of their license agreement regarding the oncology treatment Jemperli (dostarlimab).
Allegations and Counterclaims: AnaptysBio alleges that Tesaro has not met certain requirements of the license agreement, while Tesaro maintains that these claims are without merit and seeks to terminate the agreement and reduce royalty payments.
Financial Implications: The litigation could allow Tesaro to obtain a perpetual license for dostarlimab and cut its financial obligations to AnaptysBio by 50%, amidst AnaptysBio's ongoing stock repurchase plan and anticipated cash reserves.
Market Reaction: AnaptysBio's stock experienced a significant drop of 12.37% during premarket trading, reflecting investor concerns over the litigation and recent trial results for its investigational drug rosnilimab.
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Analyst Views on GSK
Wall Street analysts forecast GSK stock price to fall
6 Analyst Rating
1 Buy
2 Hold
3 Sell
Moderate Sell
Current: 58.540
Low
20.15
Averages
38.72
High
55.60
Current: 58.540
Low
20.15
Averages
38.72
High
55.60
About GSK
GSK plc is a biopharma company. The Company’s segments include Commercial Operations and Research and Development. Its portfolio and pipeline are focused on developing medicines and vaccines in four core therapeutic areas, which are the areas of human health it focuses on to prevent and treat disease: respiratory, immunology and inflammation; oncology; human immunodeficiency virus (HIV), and infectious diseases. Its specialty medicines prevent and treat diseases, from HIV to respiratory diseases, immune-mediated conditions like lupus, and cancer. Its vaccine portfolio includes over 20 vaccines to protect people from diseases and infections throughout their lives. General medicines include inhaled medicines for asthma and COPD to antibiotics. It develops and commercializes preclinical antibody-drug conjugate for Metastatic castration-resistant prostate cancer. Its portfolio also includes Efimosfermin, a fibroblast growth factor 21 (FGF21) analog therapeutic in clinical development.
About the author
Emily J. Thompson
Emily J. Thompson, a Chartered Financial Analyst (CFA) with 12 years in investment research, graduated with honors from the Wharton School. Specializing in industrial and technology stocks, she provides in-depth analysis for Intellectia’s earnings and market brief reports.
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