The times before or after normal trading hours where trades can still occur. This term can refer to both after-hours trading and/or pre-market trading sessions as well.
Related information about extended hours trading:
- Extended hours trading - Wikipedia, the free encyclopedia
 After-hours trading is stock trading that occurs after the traditional trading hours of   the major exchanges, such as the New York Stock Exchange and the Nasdaq ...
 
- Extended Hours Trading - NASDAQ.com
 Extended Hours Trading - NASDAQ offers extended trading activity including   most active stocks in the after hours pre-market trading sessions.
 
- After Hours Trading | Afterhours Stock Market Quotes - NASDAQ.com
 After Hours Stock Market Quotes - NASDAQ offers afterhours quotes and   extended trading activity data after the stock market closes for US and world   markets.
 
- Extended-Hours Trading Session Rules - TD Ameritrade
 AMTD 183 F 10/10. Page 1 of 2. It's important to understand the differences in   trading during extended-hours sessions. Before deciding to trade during an ...
 
- Fidelity.com Help - Trading Stocks
 Extended Hours Trading. Why is Fidelity offering extended hours trading? How   does extended hours trading differ from trading during the standard day market?
 
- Online Broker Review: Extended Hours Trading
 Did you also know that most online brokers offer both pre-market and after hours   trading (also known as extended hours trading)? It's not as exotic as you might ...
 
- E*TRADE FINANCIAL - Quotes & Research
 Extended Hours Trading involves unique risks. These risks apply to orders   entered during our pre-open and after-hours trading sessions, as well as to   Extended ...
 
- Extended Hours Stock Trading - Scottrade
 Extended hours trading is also available for NASDAQ National Market and Listed   Securities on normal market days and half-day market holidays, but no trading, ...