The melting of US stocks means that the stock index reaches the melting point, and the exchange will adopt the mechanism of suspending trading. There is no limit to the rise and fall of US stocks. The setting of fuse mechanism is mainly to control the risk brought by the fluctuation of US stocks. The fuse mechanism has its rules. Let's take a look at the fuse rules of US stocks.

American stock fuse rule

The rules of US stock meltdown include individual stock meltdown and market meltdown, and their rules are different.

First, individual stocks are blown.

1. Standard & Poor's 500 Index, Russell 1000 Index and ETP(ExchangeTradedProducts) in the pilot list, if the stock price rises or falls within five minutes10%;

2. For other stocks whose share price is above 1 USD, if the price rises or falls by 30% within five minutes;

3. If the price of other stocks except the above 1 and 2 is below 1 USD, the price will rise or fall by 50% within five minutes. (Note: Whether the stock price is above $65,438 +0 is subject to the closing price of the previous day)

If a stock causes ups and downs, the time is:

(1) During 9: 30- 15: 35 EDT (inclusive), the trading of individual stocks was suspended for 5 minutes.

(2) Trading will not be suspended after 15: 35 EST. (Note: If the trading day is a half-day transaction, the deadline is 12: 35)

Second, the market blew up.

The market fuse is based on the overall decline of the market, specifically the decline of the index point of the Standard & Poor's 500 index relative to the closing point of the previous day during the regular trading hours (9: 30- 16: 00 EST). (Note: If the trading day is half a day, the closing time is 13: 00).

(1) The primary market melted, which means that the market fell by 7%.

(2) The secondary market is blown, which means that the market has fallen to 13%.

(3) The melting of the tertiary market means that the market has fallen by 20%.