Stock market news today: S&P 500, Nasdaq futures tumble as China curb risk rattles techs

Dow Jones Futures Fall; Chips Tumble On ASML Earnings, Tougher China Curbs, Trump

Wall St futures slump after rally as tech stocks slide

Dow soars more than 700 points to close at another record high

S&P 500 futures fall 1% as investors continue to dump tech winners like Nvidia: Live updates

S&P 500 Gains and Losses Today: Charles Schwab Drops as Firm Plans To Shrink Bank