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]