Why Is Zenas BioPharma ( $ZBIO ) Stock Down -9.72% Today? (Find out why any stock moved today on Tickeron.) ZBIO shares fell roughly 9.7% to about $26.75, extending a steep multi-day slide. The primary catalyst was renewed dilution anxiety after a shelf registration for up to 7 million shares by selling stockholders. The selloff also reflects a valuation reset following a sharp 90-day rally in the stock. Secondary pressure came from a recent fourth-quarter earnings miss and an announced CFO transition. $REPL $RZLT $KURA $NTLA