
Triple witching hour is the last hour of the stock market trading session (3:00-4:00 P.M., New York Time) on the third Friday of every March, June, September, and December. Those days are the expiration of three kinds of securities: The simultaneous expirations generally increases the trading volume of options, futures and the underlying stocks, a...
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http://en.wikipedia.org/wiki/Triple_witching_hour

The four times a year that the S&P futures contract expires at the same time as the S&P 100 index option contract and option contracts on individual stocks. It is the last trading hour on the third Friday of March, June, September, and December, when stock options, futures on stock indexes, and options on these futures expire concurrently. ...
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http://www.duke.edu/~charvey/Classes/wpg/bfglost.htm

The four times a year that the S&P futures contract expires at the same time as the S&P 100 index option contract and option contracts on individual stocks.
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http://www.encyclo.co.uk/local/20047

Municipal bonds featuring federal, state, and local tax-free interest payments.
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http://www.encyclo.co.uk/local/22402

Slang for the quarterly expiration of stock-index futures
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http://www.encyclo.co.uk/visitor-contributions.php

The last trading hour on the third Friday of March, June, September and December when options and... <a target=_blank href='http://www.finance-glossary.com/terms/triple-witching-hour.htm?id=2152&ginPtrCode=00000&PopupMode=false' title='Read full definition of triple witching hour'>more</a>
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