US midday market brief: S&P 500 falls 0.7% as tech stocks slide; Oracle, Broadcom lead declines

US stocks pulled back sharply at midday on Wednesday as investors dumped high-flying technology names and reassessed the AI trade's underlying economics. The S&P 500 fell roughly 0.8%, the Nasdaq slumped about 1.3%, and the Dow dipped 0.3%. ...