triple witching hour


Definition
The final hour of the stock market trading session on the third Friday of March, June, September, and December, when option contracts and futures contracts expire on market indexes used by program traders. The simultaneous expirations often set off heavy trading of options, futures and the underlying stocks, which can cause large fluctuations in the value of their underlying stocks.

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triple witching hour is ...

... part of the Futures, Options, Taxes and Trading subjects.

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