Investors cheer Microsoft and Alphabet's huge AI spending plans as shares of both firms rallied but not Meta's, which saw its worst trading day in 18 months news wsj.com

Tom Dotan / Wall Street Journal: Investors cheer Microsoft and Alphabet's huge AI spending plans as shares of both firms rallied but not Meta's, which saw its worst trading day in 18 months  —  Meta had its worst trading day in 18 months after warning of years of AI investment; shares of Microsoft and Alphabet rallied