2012 options expiration and triple witching hour calendar

Economic calendars: eToro - FXstreet - ForexYard - Dukascopy - Forex Factory

Other calendars: Holiday calendar - Options expiration

Financial market movements can be erratic on days when options and futures contracts expire. This is especially true on triple witching hour days (or quadruple witching hour end-of-quarter days). It is therefore recommended that you not trade on the 3rd Friday of each month (in yellow on the calendar).

Source: www.cboe.com