A steep stock-market selloff on Thursday again had investors on the lookout for a potential trading halt, as the S&P 500 slipped toward the threshold that would trigger an initial “circuit ...

The steep selloff was again threatening to put the market's circuit-breaker rule in play. That dictates that a fall of 7% for the S&P 500 before 3:25 p.m. Eastern time results in a marketwide ...

“If you have a broken radio and you have the circuit diagram, you’ll be in a better position to fix it,” MICrONS team member Nuno da Costa, an associate investigator at the Allen ...

But if you are confused about what is a circuit breaker and how far stocks need to fall to trigger one, read on to find out. More from Explainers Saudi Arabia bans visas for India, 13 other countries.

Market-wide circuit breakers, based on moves in the S&P 500, kick in when the index sees a severe price decline. They're divided into three levels: ...