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Current trading hours on the NYSE were last changed in 1985 when they were 10am to 4pm. http://www.marketwatch.com/story/a-brief-history-of-trading-hours-on-wa

• minimax 11y ago
  The NYSE is only one of 11 registered US equity exchanges. There are other exchanges that open earlier and close later (for example the NYSE owned Arca exchange trades from 4am to 8pm Eastern).
  • uxcn 11y ago
    Stocks in the United States generally aren't listed outside of NYSE and Nasdaq though (unless you count BATS).
    • minimax 11y ago
      It doesn't matter. You don't have to trade the stock at its listing exchange.
      • uxcn 11y ago
        Generally that's true, unless it's an IPO, halted, suspended, sub-penny, etc...