Recently, many people have been asking me about pre-market trading in the U.S. stock market, so I’ve organized my experience to share with everyone.

Speaking of pre-market, many novice investors are actually not very clear on what this concept is. Simply put, pre-market trading in the U.S. stock market refers to the trading session before the New York Stock Exchange and NASDAQ officially open. It usually starts at 4 a.m. Eastern Time and lasts until the official opening at 9:30 a.m. This period seems short, but for investors who want to react early to major events happening overnight or in overseas markets, it’s quite significant.

I’ve observed many times that corporate announcements and economic data releases often don’t wait until regular trading hours. So, this pre-market period becomes a golden window for investors to adjust their positions ahead of others’ reactions. You can modify your investment portfolio based on new information before other market participants respond. That’s also the main reason why pre-market trading was established.

Regarding actual trading rules, there’s an important point I must remind everyone of. During pre-market hours, you can only use limit orders; you cannot use market orders. Why? Because the number of participants in pre-market is already small, and institutional investors and market makers usually don’t participate, so trading volume is low. Using a market order can easily result in getting filled at an outrageous price. I’ve seen people suffer losses because of this.

I remember Alibaba’s pre-market performance on November 16, 2023, as a typical example. That day, Jack Ma’s company planned to sell a large amount of stock, and at the same time, Hema Fresh and Alibaba Cloud’s IPO plans were halted. As a result, the pre-market stock price dropped more than 8%, and the opening price ended up falling 8.67% compared to the previous day’s close. This is the most direct illustration of how pre-market trading influences the opening price.

As for specific pre-market trading hours, different brokerages support different time slots. Webull supports from 4 a.m. until the market opens, Charles Schwab from 7 a.m. to 9:25 a.m., and Interactive Brokers’ regular users can start at 7 a.m. So, when choosing a broker, this is also an important factor to consider.

After-hours trading is actually a sibling to pre-market trading; both belong to extended trading hours. After-hours refers to trading after the market closes at 4 p.m., generally until 8 p.m. It also only allows limit orders. But compared to the urgency and volatility of pre-market, after-hours usually gives the market more time to digest information calmly. I observed NVIDIA’s performance on December 1, 2023, to illustrate this. During regular trading hours, the stock price fluctuated more than 2% up and down, but after hours, it stabilized. This stability often more closely reflects the true opening price of the next day.

If you want to trade during these periods, my advice is to have a clear strategy. First, liquidity during pre-market and after-hours is indeed low, and price swings are large, so avoid frequent trading and control your trading volume. Second, use pre-market to closely follow major news and events. When good or bad news appears, you can quickly adjust. Another tip is to set buy prices lower than your ideal price or sell prices higher than your target; sometimes, this can lead to unexpected fills.

Regarding risk management, I emphasize a few points. Always set stop-loss orders to prevent losses from expanding. Be cautious of unreasonable quotes, as pre-market and after-hours often see such situations. Most importantly, stay alert to news, because prices during these periods are especially vulnerable to sudden information shocks.

If you find the restrictions of pre-market and after-hours trading too limiting, another option is trading Contracts for Difference (CFD). CFD trading isn’t restricted by exchange hours and can usually be traded 24 hours a day, five days a week. Many regulated CFD brokers now offer U.S. stock trading, with lower costs and leverage options. This is a good choice for those seeking more flexibility.

In summary, pre-market trading indeed offers additional opportunities, but it also comes with increased risks. The key is to understand how it works, develop a suitable strategy, and implement good risk management. Don’t be scared by pre-market volatility, and avoid overtrading. Approaching each opportunity rationally is the secret to long-term survival in the market.