Trading Hours and Market Structure - The trading hours for A-shares are from 9:30 to 11:30 and 13:00 to 15:00 Beijing time, while U.S. stocks trade from 9:30 to 16:00 Eastern time, corresponding to 21:30 to 4:00 Beijing time during Daylight Saving Time and 22:30 to 5:00 during Standard Time [1] - U.S. stocks allow pre-market and after-hours trading, while A-shares do not have regular pre-market or after-hours trading sessions [1] Trading Units and Price Limits - A-shares are traded in units of "lots," with 1 lot equal to 100 shares, while U.S. stocks can be purchased in any quantity [1] - A-shares have a price fluctuation limit of 10% for main board stocks and 20% for Sci-Tech Innovation Board and Growth Enterprise Market stocks, whereas U.S. stocks do not have such limits, allowing for significant price volatility within a trading day [1] Trading Mechanisms and Settlement Systems - A-shares operate under a T+1 trading system, meaning stocks bought on a given day can only be sold the next trading day, while U.S. stocks follow a T+0 system, allowing same-day buying and selling [2] - The settlement system for A-shares is T+1, completing the transaction the next trading day, while U.S. stocks use a T+2 settlement system, finalizing transactions on the second business day after the trade [2] Short Selling and Transaction Costs - A-shares require investors to open margin trading accounts to short sell, with limited eligible stocks, while U.S. markets offer a more flexible short selling mechanism with most listed stocks available for shorting [2] - Transaction costs for A-shares include commissions, stamp duty on sales, and transfer fees, while U.S. transaction costs typically consist of commissions, exchange fees, and SEC transaction fees, with no stamp duty on stock trades [2] Regulatory Framework and Market Dynamics - The differences in trading rules reflect the regulatory philosophies and operational logic of the two markets, developed over time [2] - Investors engaging in cross-market trading should thoroughly understand the trading rules of the target market to ensure compliance with market regulations [2]

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]