Group 1 - The U.S. stock market has a complex trading mechanism that is crucial for market participants to understand for better engagement in trading [1] - Regular trading hours are from 9:30 AM to 4:00 PM Eastern Time, Monday to Friday, with high market participation and active trading volume [1] - Pre-market and after-hours trading provide additional opportunities for investors, especially those with specific information or analysis, although they may have lower liquidity and higher costs [1] Group 2 - The U.S. stock market does not have fixed trading unit limits, allowing investors to trade in whole shares or fractional shares, thus lowering the investment threshold [2] - Various order types exist in the U.S. stock market, including market orders, limit orders, and stop-loss orders, each serving different purposes and risk management strategies [2] - Market orders execute immediately at the best available price, while limit orders allow investors to set specific buy or sell prices, and stop-loss orders help minimize losses [2] Group 3 - The U.S. stock market operates on a T+2 settlement cycle, meaning that the settlement of funds and securities occurs on the second trading day after the transaction [3] - Brokers must complete the necessary clearing procedures with clearinghouses to ensure accurate transfer of funds and stocks between buyers and sellers [3]

Trading Rules of US Stock Market - The regular trading hours for the US stock market are from 9:30 AM to 4:00 PM Eastern Time, Monday to Friday, which differs significantly from the trading hours of A-shares [1] - In the US stock market, there is no requirement to trade in multiples of 100 shares, allowing investors to purchase as little as 1 share, providing greater flexibility in capital allocation [1] - The US stock market generally does not impose daily price limits, allowing for potentially unlimited price fluctuations within a trading day, especially during earnings announcements or significant industry events [1] T+0 Trading System - The T+0 trading system allows investors to buy and sell stocks on the same day, enabling daily capital circulation and offering various trading strategies, particularly for day traders [2] - This system requires investors to have strong market analysis skills and risk tolerance, as frequent trading can lead to increased transaction costs and decision-making errors [2] Order Types - Common order types in the US stock market include market orders, limit orders, and stop-loss orders, each serving different purposes in trading strategies [2] - Market orders execute trades at the best available price, ensuring quick completion but potentially less favorable prices [2] - Limit orders allow investors to set a specific price for buying or selling, helping to control costs or lock in profits, while stop-loss orders automatically sell stocks at a predetermined price to mitigate losses [2]