Why Is Adicet Bio ( $ACET) Stock Down -29.6% Today? (Find out why any stock moved today on Tickeron.) Shares of ACET plunged 29.6% to close at $6.35, down $2.67 from the prior session's close of $9.02. The decline came despite the company reporting positive Phase 1 data for its lead lupus therapy, prula-cel — a classic "sell the news" reaction. The stock had rallied sharply into the readout, gaining roughly 9% on Friday and trading up 16% in pre-market, setting up heavy profit-taking. $VIR $OGI $FATE $BCYC