Why Is Lam Research ( $LRCX ) Stock Down -7.08% Today? (Find out why any stock moved today on Tickeron.) Shares of Lam Research fell 7.08% on Monday, dropping to $277.12 from a prior close of $298.22. The selloff was driven by a sector-wide rout after AI industry leaders called for a slower pace of AI model development, threatening future semiconductor equipment orders. $AMAT $KLAC $NVMI $ASML $ONTO $RMBS $ADI