Last updated: October 17, 2026
- How the witching hour works
- Why volume and volatility rise
- Witching hour example
- Witching hour vs regular expiration days
- What it means for investors
- FAQ
- Related terms
How the witching hour works
On certain expiration days, traders holding expiring contracts must close, roll, or let them settle. In the US, triple witching refers to the simultaneous expiration of stock options, stock index options, and stock index futures. It occurs on the third Friday of March, June, September, and December. The term quadruple witching was used when single-stock futures also traded and expired on those days; the name persists even though those contracts are no longer listed in the US.
The witching hour is the last hour of that session, when much of the related position adjustment happens.
Why volume and volatility rise
Several forces converge. Traders close or roll futures contracts and options to new expirations. Market makers who hedged options by buying or selling shares unwind those hedges as contracts expire. Index funds often rebalance on the same days, since major index changes are frequently scheduled to coincide. Arbitrage traders close positions that linked futures prices to the underlying stocks.
The result is typically heavy volume, especially in the closing auction, and sometimes sharp short-term price swings. The effect on the market's overall direction is usually limited and short-lived.
Witching hour example
Suppose a stock has a large amount of open interest in options with a $100 strike expiring on triple witching day. As the stock trades near $100 into the afternoon, market makers adjust hedges as each tick changes which options will finish in the money. The stock might oscillate between $99.50 and $100.60 in the final hour on volume several times its normal level, then close near $100. On the next trading day, with those contracts gone, trading returns to normal.
Witching hour vs regular expiration days
Standard monthly equity options in the US generally expire on the third Friday of each month, and weekly options expire more frequently. Those days can also bring elevated activity, but quarterly witching days stand out because futures and index options expire at the same time and index rebalances often coincide. Traders sometimes refer to the closing minutes on these days as especially busy, because closing auction orders tied to expiring positions are executed then. Checking the exchange calendar ahead of time helps avoid being surprised by unusual closing prices.
What it means for investors
For long-term investors, witching hour mostly matters as a source of temporary noise and unusual closing prices. Short-term traders may avoid placing large market orders in the final hour because of rapid volatility. Investors using derivatives need to know their contracts' expiration and exercise rules, since in-the-money equity options may be exercised automatically. Monthly options also expire on the third Friday of other months, but with less activity than quarterly witching days.
Frequently asked questions
When is triple witching?
In the US, triple witching occurs on the third Friday of March, June, September, and December, when stock options, index options, and index futures expire on the same day.
What is the difference between triple and quadruple witching?
Quadruple witching added single-stock futures to the three contract types that expire together. Because those futures are no longer listed in the US, the terms are now often used interchangeably.
Does triple witching affect stock prices?
It often brings heavy volume and short-term price swings, particularly in the closing minutes, but the impact on longer-term prices is generally minimal.
Related terms
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For information only, not investment advice. See the disclaimer.