Things You Need to Know When Trading U.S. Stocks

If you’re a Korean investor trading U.S. stocks, you should know the regular trading session times accurately. The U.S. stock market is in a completely different time zone from Korea, and daylight saving time is also applied, so it’s easy to suffer losses if you miss the trading hours. Since trading often takes place in the middle of the night, extra care is especially important.

First of all, it helps to know the major U.S. stock exchanges. NYSE (New York Stock Exchange) was established in 1792 and is a historic institution; it is currently the largest stock exchange in the world. Around 2,400 companies are listed there, with a total market capitalization of about $23 trillion. Large companies such as Berkshire Hathaway, Johnson & Johnson, and Visa are mainly listed there. NASDAQ was founded in 1971 and grew rapidly, and today it has become the world’s second-largest stock exchange. Many IT companies—such as Apple, Microsoft, and NVIDIA—are listed there. AMEX is where mid-sized and small companies are mainly traded.

The regular trading hours are the same for all three exchanges. U.S. regular market hours are from 9:30 a.m. to 4:00 p.m. in U.S. Eastern Time, which corresponds to 11:30 p.m. to 6:00 a.m. Korea time. From the second Sunday in March to the first Sunday in November, when daylight saving time is in effect, the clocks are moved forward by 1 hour, so the hours become 10:30 p.m. to 5:00 a.m. In addition, there are pre-market hours (4:00 a.m. to 9:30 a.m. ET, 5:00 p.m. to 11:30 p.m. Korea time) and after-hours trading (4:00 p.m. to 8:00 p.m. ET, 6:00 a.m. to 10:00 a.m. the next day in Korea time).

There are several things to watch out for when trading. First, trading is conducted only in U.S. dollars, and settlement is completed 2 business days later. Second, unlike Korea, there are no price limit restrictions. Because you may not be able to respond quickly when prices drop sharply, you should take this into account when planning your trades.

It also helps to know the U.S. stock market holidays in 2026 in advance. The market will be closed on New Year’s Day (January 1), Martin Luther King Jr. Day (January 19), Presidents’ Day (February 16), Good Friday (April 3), Memorial Day (May 25), Juneteenth (June 19), Independence Day (July 3), Labor Day (September 7), Thanksgiving Day (November 26), and Christmas (December 25). In addition, the market closes early at 1 p.m. ET on the day before Independence Day, the day after Thanksgiving, and on Christmas Eve, so don’t miss that either.

If you compare trading hours with the Korean market, the Tokyo market, the London market, the Hong Kong market, and the Shanghai market, you’ll see that each market has completely different trading hours and different intraday market-closure times. In particular, when you plan trades based on U.S. regular market hours, you must convert to Korea time accurately.

In conclusion, to trade U.S. stocks efficiently, it’s essential to know the regular trading hours, market closures, and time zone differences precisely. Since trading hours can change, it’s recommended that you always check the latest information and re-confirm the Korea time conversion before entering a trade. If you get these basics right, you can reduce the chances of making mistakes in your trading.