Types(trading)

U.S. exchange extended-hour markets

The NYSE and ASE provide crossing sessions in which matching buy and sell orders can be executed at 5:00 p.m. based on the exchanges' 4:00 p.m. closing prices. The BSE and PSE have post-primary sessions that operate from 4:00 to 4:15. CHX and PCX operate their post-primary sessions until 4:30 p.m. Additionally CHX has an "E-Session" to handle limit orders from 4:30 to 6:30p.m.

Foreign exchange extended-hour markets

Several foreign exchanges also trade certain NYSE-listed stocks. Hours are governed by those individual markets.

ECN extended hour markets

Electronic communication networks (ECNs) have allowed institutions to participate in extended-market trades since 1975; individuals joined the party in 1999. Typically, extended-hour trades must be done with limit orders.