The trading curbs go into effect when the S&P 500 crosses certain thresholds during extreme market volatility.

The S&P 500 was trading around 5,470 on Thursday, down about 3.6%. While this certainly feels like a significant decline, the ...

Stocks fell sharply again Thursday, with declines nearing levels that would trigger a marketwide trading halt. These are the ...

The Thursday selloff has torched more than $2.5 trillion in market value so far, but the stock market is still ways away from a trading halt. The S&P 500 was recently down 4.1%. It would need to fall ...