US Stock Trading Rules

US Stock Trading Hours
After the opening of the US stock market of Sino-rich Securities, it currently supports the trading of US-listed stocks and ETFs.
Sino-Rich Securities US stock trading hours (Monday ~ Friday)
Eastern Time(ET)
9:30~16:00
Hong Kong Time (Eastern Summer Time)
21:30~4:00 the next day
Hong Kong Time (Eastern Winter Time)
22:30~5:00 the next day
*For the introduction of summer time and winter time, please refer to the website.  Stay tuned for pre-market and after-hours trading sessions.

US Stock Price Limit
US stocks are the same as Hong Kong stocks, and there is no one-day limit on the rise and fall. Investors need to control risks.

US Stock Circuit Breaker
After the stock market crash in 1987, the U.S. stock market introduced a Circuit Breaker, also known as an automatic suspension mechanism, which refers to the suspend trading measures taken by the exchange to control risks when the volatility of the stock index reaches the specified stock fuse point.

(1)The Market Circuit Breaker
U.S. stocks implement a three-level circuit breaker mechanism, based on the S&P 500 index:
Level 1: When S&P 500 fell 7% from the previous day's closing price, temporarily suspended for 15 minutes;
Level 2: After the resumption of trading, the cumulative decline is 13%, and trading will be suspended for another 15 minutes;
Level 3: After resumption of trading, the stock market continues to fall. When the cumulative decline is 20%, the stock market will be closed until the second trading day.
*The level 1 and level 2 suspension mechanism are applicable before 15:25 EST (3:25 Hong Kong time) on the trading day


(2)The Stock Circuit Breaker
In addition to the circuit breaker mechanism for the stock market, the stock also has a "Limit Up-Limit Down Rule”. If a stock rises or falls by more than a certain range within 5 minutes and fails to return to the specified "price fluctuation range" within 15 seconds, trading will be suspended for 5 minutes.
Here are the situations:
stock price classification
Continuous Trading Session Range
9:30~15:35 EST
Closing Session Range
15:35~16:00EST
1.S&P 500 Index constituents
2.Russell 1000 Index constituents
3.Designated exchange products
Stocks with previous day's closing price > $3
5%
10%(double)
Other stocks with previous day's closing price > $3
10%
10%
Stocks with $0.75 ≤previous day's closing price ≤ $3
20%
40%(double)
Stocks with prior day's closing price < $0.75
75% or $0.15(whichever is less)
150% (up only) or $0.3
(the smaller of the two) (double)

The smallest trading unit of U.S. stocks& order types
Unlike Hong Kong stocks, which use "lot size" as the minimum trading unit, US stocks require at least one share per transaction, and investors need a lower entry fee.
Minimum trade quantity
1share
Order Type
Limit order , Stop Limit order
Minimum spread
stock price ($)
Minimum spread($)
 <1
0.0001
 ≥1
0.01

US stock trading and settlement mechanism
Like Hong Kong stocks, securities traded on US exchanges are subject to T+0 trading, that is, stocks bought on the same day can be sold on the same day; T+2 is implemented for clearing and delivery, that is, funds and stocks are completed on the second trading day after the transaction is completed. 

For example: T is Monday, settlement will be completed on Wednesday; T is Thursday, settlement will be completed on the next Monday (the above days are all trading days).

US stocks closed for holiday


Other restrictions on placing orders for US stocks
  • Orders of the next trading day will be accepted 15 minutes after the current trading market closes, that is, after 4:15 (summer time)/5:15 (winter time) Hong Kong time, orders for US stocks that night can be placed;
  • No short selling;
  • As a limit order, when the order price deviates by more than 20% from the market price, the upstream risk control system will refuse to place the order;
  • In some special cases, upstream traders may refuse to place an order. Common reasons include: failure to meet upstream risk control rules, excessive price deviation, temporarily unsupported trading, unable to find the corresponding stock code, etc.;
  • If you hold over-the-counter (OTC) stocks, you can consult the current quotation and sell by calling our customer service hotline, please note that we do not support buying new stocks in the OTC market.

US Stock Trading Rules

US Stock Trading Hours
After the opening of the US stock market of Sino-rich Securities, it currently supports the trading of US-listed stocks and ETFs.
Sino-Rich Securities US stock trading hours
 (Monday ~ Friday)
Eastern Time(ET)9:30~16:00
Hong Kong Time (Eastern Summer Time)21:30~4:00  the next day
Hong Kong Time (Eastern Winter Time)22:30~5:00 the next day
*For the introduction of summer time and winter time, please refer to the website.  Stay tuned for pre-market and after-hours trading sessions.

US Stock Price Limit
US stocks are the same as Hong Kong stocks, and there is no one-day limit on the rise and fall. Investors need to control risks.

US Stock Circuit Breaker
After the stock market crash in 1987, the U.S. stock market introduced a Circuit Breaker, also known as an automatic suspension mechanism, which refers to the suspend trading measures taken by the exchange to control risks when the volatility of the stock index reaches the specified stock fuse point.
(1)The Market Circuit Breaker
U.S. stocks implement a three-level circuit breaker mechanism, based on the S&P 500 index:
Level 1: When S&P 500 fell 7% from the previous day's closing price, temporarily suspended for 15 minutes;
Level 2: After the resumption of trading, the cumulative decline is 13%, and trading will be suspended for another 15 minutes;
Level 3: After resumption of trading, the stock market continues to fall. When the cumulative decline is 20%, the stock market will be closed until the second trading day.
*The level 1 and level 2 suspension mechanism are applicable before 15:25 EST (3:25 Hong Kong time) on the trading day

(2)The Stock Circuit Breaker
In addition to the circuit breaker mechanism for the stock market, the stock also has a "Limit Up-Limit Down Rule”. If a stock rises or falls by more than a certain range within 5 minutes and fails to return to the specified "price fluctuation range" within 15 seconds, trading will be suspended for 5 minutes.
Here are the situations:
Stock price classificationContinuous Trading Session Range9:30~15:35 ESTClosing Session Range15:35~16:00EST
  1. S&P 500 Index constituents
  2. Russell 1000 Index constituents
  3. Designated exchange products
    Stocks with previous day's closing price > $3
5%10%(double)
Other stocks with previous day's closing price > $310%10%
Stocks with $0.75 ≤previous day's closing price ≤ $320%40%(double
Stocks with prior day's closing price < $0.7575% or $0.15(whichever is less)
150%(up only) or $0.3
(the smaller of the two) (double)

The smallest trading unit of U.S. stocks& order types
Unlike Hong Kong stocks, which use "lot size" as the minimum trading unit, US stocks require at least one share per transaction, and investors need a lower entry fee.
Minimum trade quantity
1 share
Order Type
Limit order ,Stop Limit order
Minimum spread
Stock price($)
Minimum spread($)
 <1
0.0001
 ≥1
0.01

US stock trading and settlement mechanism
Like Hong Kong stocks, securities traded on US exchanges are subject to T+0 trading, that is, stocks bought on the same day can be sold on the same day; T+2 is implemented for clearing and delivery, that is, funds and stocks are completed on the second trading day after the transaction is completed.

For example: T is Monday, settlement will be completed on Wednesday; T is Thursday, settlement will be completed on the next Monday (the above days are all trading days).

US stocks closed for holiday


Other restrictions on placing orders for US stocks
  • Orders of the next trading day will be accepted 15 minutes after the current trading market closes, that is, after 4:15 (summer time)/5:15 (winter time) Hong Kong time, orders for US stocks that night can be placed;
  • No short selling;
  • As a limit order, when the order price deviates by more than 20% from the market price, the upstream risk control system will refuse to place the order;
  • In some special cases, upstream traders may refuse to place an order. Common reasons include: failure to meet upstream risk control rules, excessive price deviation, temporarily unsupported trading, unable to find the corresponding stock code, etc.;
  • If you hold over-the-counter (OTC) stocks, you can consult the current quotation and sell by calling our customer service hotline, please note that we do not support buying new stocks in the OTC market.