The regular stock market hours for the major U.S. exchanges, including the New York Stock Exchange (NYSE) and Nasdaq, are Monday through Friday from 9:30 a.m. to 4:00 p.m. Eastern Time (ET)

. Extended trading hours are available outside the regular session:

• Pre-market trading typically runs from 4:00 a.m. to 9:30 a.m. ET.
• After-hours trading usually runs from 4:00 p.m. to 8:00 p.m. ET.
  These extended hours allow investors to trade in response to news or events outside regular hours but may involve less liquidity and higher risk

Market holidays and early closures:

• The market is closed on major U.S. holidays such as New Year's Day, Martin Luther King Jr. Day, Presidents' Day, Good Friday, Memorial Day, Independence Day, Labor Day, Thanksgiving, and Christmas

• Early market closes occur at 1:00 p.m. ET on certain days like Christmas Eve and the day after Thanksgiving

In summary, the core U.S. stock market trading hours are 9:30 a.m. to 4:00 p.m. ET, Monday to Friday, with extended trading sessions before and after these times and closures on federal holidays