Here's what to know about so-called “circuit breakers" and when they're used to halt trading on stock markets.

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

The US stock market had a choppy first hour on Thursday with Dow Jones falling as much as 2,150 points, the S&P 500 and the Nasdaq down between 6.5% to 7%. This comes after the Bureau of Labor ...