The term quadruple witching refers to the date when four different types of futures and options expire on the same day.
This happens with four different types of contracts, including stock index futures, stock index options, stock options, and single stock futures.
Quadruple witching dates occur four times a year on the third Friday of March, June, September, and December.
Market activity on these days is typically highest during the last trading hour as traders try to move on these contracts.
Quadruple witching days replaced triple witching days when single stock futures started trading in November 2002.
The terms triple and quadruple witching are often used interchangeably even though there's a disparity in the number of expiring markets.

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