Zenas BioPharma Inc shares fell $2.02, or 5.2%, to $37.03 in afternoon trading on Tuesday, after ending the prior session at $39.05. The stock ranged from $36.94 to $40.50, with about 123,000 shares traded.
Zenas BioPharma, Inc. shares were flat in premarket trading on Tuesday, with the stock last indicated at $39.05 as of 9:00 a.m. ET. The biotech closed down 8.1% on Monday. Public+1
Zenas BioPharma, Inc. is having one of those classic biotech days where the market starts acting like it can see the future. On Monday, December 22, 2025, ZBIO surged roughly 14% and traded around $41.23 by early afternoon Eastern time—after touching a fresh all-time high near $41.67, according to multiple market data reports. MarketBeat+1