Summit Therapeutics stock tumbles as FDA filing for ivonescimab hits tape, GSK trial tie-up follows
New York, Jan 12, 2026, 14:55 EST — Regular session Shares of Summit Therapeutics Inc dropped roughly 11% to $17.46 Monday afternoon, after fluctuating between $20.30 and $16.51. The move came following the company’s announcement that it filed a U.S.