Why Is Longeveron ( $LGVN ) Stock Down -55.99% Today? (Find out why any stock moved today on Tickeron.) Shares plunged roughly 56%, tumbling from a prior close of $6.68 to about $2.94 in intraday trading. Primary catalyst: The company's ELPIS II Phase 2b trial of laromestrocel failed to meet its primary efficacy endpoint in infants with hypoplastic left heart syndrome (HLHS). $QURE $BIVI $SNGX $MGNX $INKT