How Quadruple Witching Affects Stock and Futures Trading

Bifu 小编 · 2026-05-18 · 2 min read

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Quadruple Witching is a special market event that occurs four times a year, usually accompanied by abnormal volatility and trading volume. This article analyzes the mechanism of Quadruple Witching and its impact on the stock and futures markets.

Quadruple Witching Day refers to a special trading day when four types of derivative contracts expire simultaneously: stock index futures, stock index options, single stock futures, and single stock options. This event occurs on the third Friday of March, June, September, and December each year.

Market Mechanism of Quadruple Witching

When a large number of derivative contracts expire at the same time, institutions and traders holding these contracts need to conduct a large number of closing, rolling, or hedging operations. These concentrated operations significantly amplify market trading volume in a short period, sometimes causing sharp price fluctuations, especially most evident in the last hour (before the close).

Main Impacts on the Market

Surge in Trading Volume: The trading volume on Quadruple Witching days is usually several times higher than on normal trading days, sometimes reaching 2 to 3 times the usual volume; Increased Price Volatility: The concentrated buying and selling triggered by the expiration of a large number of contracts may lead to short-term abnormal price fluctuations; Pin Risk (Expiration Day Attraction Effect): Before option expiration, prices tend to move toward the strike price of a large number of open positions (known as Pin Risk or Max Pain effect).

Impact on Forex Traders

Although Quadruple Witching directly involves the stock and futures markets, the changes in risk sentiment it triggers can be transmitted to the forex market through correlations, especially affecting currency pairs with high correlation to the stock market (such as the Australian dollar, Japanese yen, etc.).

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