Zenas BioPharma stock slides again premarket after INDIGO Phase 3 data sparks fresh scrutiny
Zenas BioPharma shares dropped 5.8% to $15.66 in premarket trading Tuesday, extending a 52% plunge after Phase 3 data for obexelimab in IgG4-related disease. The drug met its main goal but fell short of results seen with Amgen’s Uplizna, prompting Morgan Stanley to downgrade the stock and cut its price target. Zenas plans to file for FDA approval in Q2 2026.