The U.S. stock markets, such as the New York Stock Exchange and Nasdaq, are open for business weekdays from 9:30 a.m. until 4:00 p.m. Eastern Time. Those are normal market hours. However, certain brokers allow customers to buy or sell some stocks and exchange-traded funds (ETFs) before the market opens in a pre-market session or after the market closes in an after-hours session.

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