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DEFINITION of 'Opening Bell'. A bell that is rung to signify the start of the day's trading session. The opening bell is both a symbol of the opening of the market for the day and a physical event involving an individual striking a metal bell. Since 1985, the New York Stock Exchange (NYSE) has used the opening bell to start its trading session at 9:30 a.m.
Trading hours on the principal American stock markets, the New York Stock Exchange -- now called NYSE Euronext -- and the Nasdaq electronic system, are Monday through Friday from 9 a.m. until 4 p.m. Eastern time. Both markets also have premarket operations and extended hours until 8 p.m.