On the 12th, Beijing time, during the Asian trading session on Wednesday, after US President Trump delivered a televised speech on the epidemic and announced the suspension of all travel from Europe to the US, NASDAQ futures plummeted by more than 5%, triggering a meltdown. Dow futures fell 5%, and S&P 500 futures fell 4.5%.

Currently, the US has a fusion mechanism during US trading hours and non-US trading periods, and even for some individual stocks.

What is the regulation for fusing during non-US trading hours?

In non-US trading sessions, if the price of stock index futures rises or falls by 5%, it will trigger a fuse mechanism.

Also, if the main futures contract is a limit buy or limit trade offered at 8:23 a.m. and is still a limit buy or sell at 8:25 a.m., then trading will be suspended until 8:30 a.m. During the suspension period, the exchange will reduce the price limit for the indicative opening of positions to 7%.