Quadruple (Quad) Witching: Definition and How It Impacts Stocks

What Is Quadruple Witching?

"Quadruple witching" refers to the simultaneous expiration four times a year of stock options, index futures, and index futures options derivatives contracts. The fourth type of contract involved in quadruple witching, single-stock futures, hasn't traded in the U.S. since 2020 and was never a major contributor to equity trading volumes. What is now effectively "triple witching" occurs on the third Friday of March, June, September, and December. Equity trading volume tends to rise on these days and is typically heaviest during the last hour of trading as traders adjust their portfolios.

Quadruple Witching Dates

The financial markets have quadruple witching dates on the third Friday of March, June, September, and December. On these days, four types of financial contracts expire simultaneously: stock index futures, stock index options, stock options, and single stock futures.

Here are the dates for 2024:

• March 15
• June 21
• Sept. 20
• Dec. 20

Here are the dates for 2025:

• March 21
• June 20
• Sept. 19
• Dec. 19

Here are the dates for 2026:

• March 20
• June 19
  
• Sept. 18
• Dec. 18

During the last hour of trading on these days, known as the quadruple witching hour, market activity might increase as traders adjust positions and roll over contracts.

Understanding Quadruple Witching

The four derivatives contracts accounting for the 'quadruple' in quadruple witching are stock index futures, stock index options, stock options, and single stock futures. While single stock futures now only trade outside the U.S., the quarterly expiration of index futures and index options, coinciding with the monthly expiration of stock options, produces a flurry of trading.

Despite the evocative name, what happens during what is now triple witching is not a supernatural phenomenon nor a mystery. Market makers who've sold expiring stock and index options contracts close out the matched hedge positions, boosting trading volume. Meanwhile, the rolling of contracts ahead of expiration also increases turnover in the options and futures markets.

Another factor is quarterly index rebalancing, also known as reconstitution, on the "witching" day. That means portfolio managers tracking rebalancing indexes, including those from S&P Dow Jones in the U.S. and FTSE in the U.K., may need to trade reflecting index changes.

Types of Contracts Involved in Quadruple Witching

Now that you know what quadruple witchings are all about, let's take a look at the four classes of contracts that can expire on these dates.

Stock Options

Options are derivatives, which means they derive their value from underlying securities such as stocks. Options contracts give a buyer the right, but not the obligation, to trade a set number of shares of the underlying security at a given strike price at any time before options expire.

There are two types of options:

• A call option may be bought to speculate on a price increase in a particular stock. If the share price is higher than the strike price on the option's expiration date, the investor can exercise the option to buy 100 shares of the stock at the strike price and resell them at the higher market price or may simply sell the option at a profit before expiration.
• A put option lets an investor profit from a decline in a stock's share price, as long as the price is below the strike at expiration.

Monthly stock options contracts expire on the third Friday of every month. Option buyers pay an upfront cost known as the option premium.

Index Options

An index option works much like a stock options contract, but derives its value from that of an equity index rather than a single stock's share price. The value of the underlying index relative to the option contract's strike price is what determines an index option trade's profitability. As with stock options, index options don't confer an ownership interest.

Unlike stock options, index options are cash-settled. Another important distinction is that index options are European-style, meaning they can only be exercised on expiration date, while stock options may be exercised at any time before expiration.

Index Futures

Futures contracts are legal agreements to buy or sell an asset at a determined price at a specified future date. Futures contracts are standardized with fixed quantities and expiration dates. Futures trade on a futures exchange. The buyer of a futures contract is obligated to buy the underlying asset at expiry while the seller is obligated to sell at expiry.

Index futures cash settle at expiration at the specified price, with the value of the index at the time determining the trade's profitability. Like index options, index futures can be used to hedge a portfolio of stocks, limiting the damage from bear markets.

In a bear market, a trade selling a futures contract earns a profit, offsetting the stock portfolio's loss. The goal is to minimize short-term losses for long-term holdings.

Single Stock Futures

Single stock futures are obligations to take delivery of shares of the underlying stock at the contract's expiration date at a specified price. Each contract represents 100 shares of stock. Holders of stock futures don't receive dividend payments. Even when single-stock futures traded in the U.S. they were a minor market segment relative to the trading flows in stock options and index options and futures.

Market Impact of Quadruple Witching

One reason the combination of monthly and quarterly derivatives expirations generates heavy trading volume is that in-the-money options contracts are subject to automatic exercise, requiring the delivery of the underlying shares in the case of call options.

Call options are profitable when the price of the underlying security is higher than the option's strike price. Put options are in-the-money when the stock is priced below the strike price. In either case, the expiration of in-the-money options results in increased trading volume as the underlying shares are bought or sold to close out the options trade.

Despite the overall increase in trading volume, quadruple witching days do not necessarily add to market volatility.

Closing and Rolling out Futures Contracts

Much of the action surrounding futures and options on quadruple witching days is focused on offsetting, closing, or rolling out positions. A futures contract contains an agreement between the buyer and seller in which the underlying security is to be delivered to the buyer at the contract price at expiration.

For example, one E-mini S&P 500 futures contract is worth 50 times the value of the S&P 500. So the value of an E-mini contract when the S&P 500 is 2,100 at expiration is $105,000. This amount is delivered to the contract owner if it is left open at expiration.

Contract owners don't have to take delivery on the expiration date. Instead, they can close their contracts by booking an offsetting trade at the prevailing price by cash settling the gain or loss from the purchase and sale prices. Traders can also roll their contracts forward, a process that extends the contract by offsetting the existing trade and simultaneously booking a new option or futures contract to be settled in the future.

Arbitrage Opportunities

Over the course of a quadruple witching day, transactions involving large blocks of contracts can create price movements that may provide arbitrageurs the opportunity to profit on temporary price distortions. Arbitrage can rapidly escalate volume, particularly when high-volume round trips are repeated multiple times over the course of trading on quadruple witching days. However, just as activity can provide the potential for gains, it can also lead to losses very quickly.

Real-World Example of Quadruple Witching

There tends to be a lot of frenzy in the days leading up to a quadruple witching day. But it's unclear whether the actual witching leads to increased market gains. That's because it's impossible to separate any gains due to expiring options and futures from gains due to other factors such as earnings and economic events.

Friday, March 15, 2019, was the first quadruple witching day of 2019. As with any other witching day, there was hectic activity in the preceding week. According to a Reuters report, trading volume on U.S. market exchanges on that day was "10.8 billion shares, compared to the 7.5 billion average… over the last 20 trading days."

Frequently Asked Questions

The Bottom Line

During the last hour of trading on the third Friday of March, June, September, and December, called the quadruple witching hour, market activity can increase as traders adjust positions and rollover contracts. Investors should know this at a minimum to understand the reasons for increased trading at those times and plan accordingly.