If you want to start investing in U.S. stocks, there’s something you absolutely need to know: the U.S. stock trading hours. Many investors miss the right trading timing due to time zone differences, so I’ll organize this information clearly for you this time.

First, let’s look at the major stock exchanges in the U.S. There are three of them: NYSE (New York Stock Exchange), NASDAQ, and AMEX. NYSE has been operating since 1792 and is the largest exchange in the world. About 2,400 companies are listed there, and the market capitalization reaches $23 trillion. Large-cap stocks such as Berkshire Hathaway, Johnson & Johnson, and Visa are mainly listed there.

NASDAQ was established in 1971, and it’s where many IT companies trade. Technology giants like Apple, Microsoft, and NVIDIA are traded here. AMEX is best thought of as an exchange focused on mid-cap and small-cap companies.

Now, let’s figure out the exact trading hours for the U.S. market. All three exchanges operate on the same trading schedule. Regular trading hours are from 9:30 a.m. to 4:00 p.m. Eastern Time. In Korea, that corresponds to 11:30 p.m. to 6:00 a.m. the next day. However, from mid-March to early November, when daylight saving time (DST) is in effect, the time shifts one hour earlier—so it becomes 10:30 p.m. to 5:00 a.m.

In addition to regular hours, there are pre-market and after-hours trading. Pre-market runs from 4:00 a.m. to 9:30 a.m. Eastern Time (6:00 p.m. to 11:30 p.m. in Korea), and after-hours runs from 4:00 p.m. to 8:00 p.m. Eastern (6:00 a.m. to 10:00 a.m. the next day in Korea).

Looking at the trading rules, all trades are conducted in U.S. dollars, and settlement is completed 2 business days later. The important point is that, unlike Korea, the U.S. stock market has no price limit bands. This means that, since the market operates during the night based on Korean time, it may be difficult to respond quickly to a rapid drop in prices.

When considering U.S. trading hours, you must also check the market holiday schedule. As of 2026, the market is closed on January 1 (New Year’s Day), January 19 (Martin Luther King Jr. Day), February 16 (Presidents’ Day), April 3 (Good Friday), May 25 (Memorial Day), June 19 (Juneteenth), July 3 (Independence Day), September 7 (Labor Day), November 26 (Thanksgiving Day), and December 25 (Christmas).

Additionally, on July 2 (the day before Independence Day), November 27 (the day after Thanksgiving Day), and December 24 (Christmas Eve), U.S. trading hours are shortened. On these days, the market closes early at 1:00 p.m. Eastern Time, which is 2:00 a.m. in Korea the next day.

It’s also a good idea to know the trading hours in other countries, not just the U.S. The Korea Exchange runs from 9:00 a.m. to 3:30 p.m., the Tokyo Stock Exchange runs from 9:00 a.m. to 3:00 p.m. (lunch break 11:30 a.m. to 12:30 p.m.), and the London Stock Exchange runs from 8:00 a.m. to 4:30 p.m. (during daylight saving time, Korea time is from 5:00 p.m. to 1:30 a.m. the next day).

In conclusion, accurately understanding U.S. trading hours is the first step toward building an effective investment strategy. Trading hours and market holidays can change, so you should always check the latest information—especially around the DST transition periods. If you truly understand the U.S. trading hours, you can reduce the number of trading opportunities you miss.