Circuit Breaker Halt Trading on the Dow Jones

The Dow Jones industrial average would have to fall 1,100 points on the day to trigger the first trading halt.

If that decline is reached before 2 p.m., the market will shut down for an hour. If the threshold is breached between 2 p.m. and 2:30 p.m., the halt will last 30 minutes. No trading stops would take place if the plunge occurs after 2:30 p.m.

If the index were to fall 2,200 points before 1 p.m., the market would close for two hours. If such a decline took place between 1 p.m. and 2 p.m., there would be a one-hour pause. The market would close for the day if stocks sank to that level after 2 p.m.

In the event of a 3,350-point decline, the market would close for the day, regardless of the time.