triple witching hour

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triple witching hour

n.
The hour before the closing of the stock market on the third Friday of March, June, September, or December, when stock index options, stock index futures, and stock options expire, known for its high trading volume and volatile prices.

tri′ple witch′ing hour`


n.
the last hour of trading on the New York Stock Exchange on the four Fridays each year when stock options, stock index futures, and options on such futures simultaneously expire: regarded as a time of extreme volatility in trading.
[1985–90]