GSK stock in focus as Jemperli royalty fight escalates ahead of JPM conference

Shares of GSK plc face fresh legal uncertainty on Monday after AnaptysBio moved to dismiss part of a contract claim related to royalties for the cancer drug Jemperli. On Friday, GSK slipped 0.26% to 1,886 pence, just shy of its 52-week peak at 1,909.5. Technical traders are eyeing the 1,830 pence level, close to the 200-day moving average, as a key support zone.

GSK stock: $50m Noetik deal and Jemperli royalty lawsuit sharpen focus on Feb 4 results

GSK stock: $50m Noetik deal and Jemperli royalty lawsuit sharpen focus on Feb 4 results

AnaptysBio said it filed a motion asking a U.S. court to dismiss part of a claim by GSK plc’s oncology unit, escalating a dispute over royalties tied to sales of cancer drug Jemperli, a PD-1 inhibitor — a kind of immunotherapy that helps the immune system attack tumours. Tesaro sued AnaptysBio in Delaware in November seeking to terminate a 2014 licence and halve royalty and milestone payments, while AnaptysBio countersued and pointed to trials involving rival PD-1 drugs including Merck’s Keytruda; the case is set for a July 14–17 trial and the court is expected to hear the motion by early March, with royalties under the licence rising to 25% on annual sales above $2.5 billion through patents expiring in 2035-36. GSK did not immediately respond to a request for comment, and its U.S.-listed shares ended Friday up 0.3% at $50.39.

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