Quadruple witching refers to a specific date on which four different types of financial instruments—
stock index
futures, stock index options, stock options, and single stock futures—expire simultaneously. This phenomenon occurs on the third Friday of March, June, September, and December each year. Quadruple witching is significant because it often leads to increased trading volume and
volatility in the financial markets.
To understand how quadruple witching differs from other types of options expiration, it is important to first grasp the concept of options expiration itself. Options are
derivative contracts that give the holder the right, but not the obligation, to buy or sell an
underlying asset at a predetermined price (
strike price) within a specified period (expiration date). When an option reaches its expiration date, it becomes void and loses all value.
Options expiration typically occurs on the third Friday of each month. On this day, all options contracts that have not been closed or exercised prior to expiration become worthless. However, unlike quadruple witching, regular options expiration only involves the expiration of stock options.
In contrast, quadruple witching encompasses the simultaneous expiration of four different types of financial instruments. Let's explore each of these components in more detail:
1. Stock Index Futures: These are futures contracts based on a specific stock index, such as the S&P 500 or the Dow Jones Industrial Average. Stock index futures allow investors to speculate on the future direction of the overall
stock market. When stock index futures expire during quadruple witching, traders must either close their positions or roll them over to a future expiration date.
2. Stock Index Options: Similar to stock index futures, stock index options are derivative contracts based on a specific stock index. However, instead of obligating the holder to buy or sell the underlying asset, stock index options provide the right to do so. During quadruple witching, traders holding stock index options must decide whether to exercise their options or let them expire worthless.
3. Stock Options: Stock options are derivative contracts that give the holder the right to buy (
call option) or sell (
put option) a specific stock at a predetermined price within a specified period. Quadruple witching involves the expiration of stock options, which means traders holding these options must make decisions regarding exercise or expiration.
4. Single Stock Futures: Single stock futures are futures contracts based on individual stocks. They allow investors to speculate on the future price movements of a particular stock. During quadruple witching, single stock futures contracts also reach their expiration date, requiring traders to take appropriate actions.
The key difference between quadruple witching and regular options expiration lies in the number and variety of financial instruments involved. While regular options expiration only includes the expiration of stock options, quadruple witching encompasses the expiration of stock index futures, stock index options, stock options, and single stock futures. This convergence of multiple expirations on a single day often leads to heightened trading activity and increased volatility in the financial markets.
In summary, quadruple witching refers to the simultaneous expiration of four different types of financial instruments—stock index futures, stock index options, stock options, and single stock futures—on the third Friday of March, June, September, and December each year. This phenomenon differs from regular options expiration by involving a broader range of instruments, leading to increased market activity and volatility.