Each country is different. However, you can assume that major national holidays will result in the closure of financial markets. In the United States, the following holiday closures are in effect: New Year’s Day, Martin Luther King Jr. Day, Washington’s Birthday, Good Friday, Memorial Day, Independence Day, Labor Day, Thanksgiving, and Christmas. There are partial holidays the day after Thanksgiving (Black Friday), and Christmas Eve. During those days, markets run from 9:30 AM - 1 PM. EST. In the US, when holidays fall on Saturdays, markets close on the Friday. When holidays are on Sundays, markets close on Mondays.