I’ve been following the US market for a long time. The truth is that most people only focus on stock prices and don’t pay attention to the most important thing: exactly when the US market opens, and how to take advantage of these times wisely.

The US market is open Monday through Friday from 9:30 AM to 4:00 PM New York time. This is the official session, where you get real liquidity and strong market movement. But what many people don’t know is that there is trading before the opening—from 4:00 AM to 9:30 AM—and trading after the close—from 4:00 PM to 8:00 PM. Many important news items come out outside the official hours, and a stock may open the next day with a large gap.

For those following from Arab countries, when does the US market open in their time zones? In Saudi Arabia and the UAE, the official session starts at around 5:30 PM and ends at midnight. In Egypt and Jordan, it’s roughly from 4:30 PM to 11:00 PM. The key is to keep track of daylight saving time and standard time, because it changes every year.

Official holidays are very important for a new investor. For example, in 2026 the stock exchange is closed on New Year’s Day on January 1, on January 19 for Martin Luther King Day, and on February 16 for Presidents’ Day. At the end of November, on Thanksgiving Day and the Friday after it, there is an early close at 1:00 PM instead of 4:00 PM. If you don’t pay attention to these days, you might enter a trade on a closed day—or be shocked by how thin liquidity can be.

There are many things that move the US market during the session. Economic data such as inflation and jobs can change the direction of indicators within minutes. Federal meetings are very important, and the market watches every word Jerome Powell says. Earnings from major companies like Apple, Microsoft, and Tesla strongly move the market, especially if the results differ from expectations. Even geopolitical news can quickly push investors to change their strategy.

The first hour after the opening—from 9:30 to 10:30 AM New York time—is usually the most active, and stocks tend to move strongly. During this time, the market digests the news that came out before the opening, and clear price gaps often appear. The problem is that the move can be fast and may reverse quickly, so you need to be cautious. The middle of the session is usually a bit calmer, but don’t forget that unexpected news can bring activity back at any time. The last hour—from 3:00 to 4:00 PM—is extremely important because institutions rebalance their positions before the market closes, and the movement can be clear and strong.

As for when the US market opens, the important thing to know is that the best time to trade depends on your trading style. If you like momentum and fast movement, the first hour after the opening is suitable for you. If you prefer clear breakouts, wait until the stock breaks an important level with high trading volume. If you like pullbacks and rebounds, watch for exaggerated moves and enter when you see a reversal signal.

Trading outside the official hours carries higher risks. Liquidity is lower, the difference between buy and sell prices (bid-ask spreads) is wider, and price movement can be misleading. If you’re a new trader, it’s best to watch these periods without entering real trades. But it’s crucial to follow the news that comes out outside official hours, because it may affect the market’s opening the next day.

My advice for a new trader: don’t enter a trade the moment the market opens. Wait a bit until the first wave of movement settles and the direction becomes clearer. Review the economic calendar before the session. Check the dates of major companies’ earnings releases. Use stop-loss orders seriously, especially in the first and last hour. Start with a demo account or a small size when you’re testing your strategy.

In the end, understanding when the US market opens and how to take advantage of different trading times gives you a real edge. Every successful trader knows that timing and discipline matter more than luck. If you start paying close attention to these details, you’ll notice the difference in your results.