What Is Quadruple Witching?
Let me explain quadruple witching directly: it's that intense last hour of trading on the third Friday of March, June, September, and December, when stock index futures, stock index options, stock options, and single stock futures all expire at the same time. You need to know this because it drives a surge in activity as everyone scrambles to adjust their positions.
Key Dates for Quadruple Witching
These events happen quarterly, specifically on the third Friday of those months I mentioned. For 2025, mark your calendar for March 21, June 20, September 19, and December 19. In 2026, it's March 20, June 19, September 18, and December 18. During that final hour—the witching hour—trading ramps up as positions get adjusted, so if you're in the market, stay alert.
Exploring the Mechanics
Here's how it works: the 'quadruple' comes from those four derivatives expiring together, but since single-stock futures stopped trading in the U.S. in 2020, it's more like triple witching now. Market makers close out hedges on expiring options, and traders roll over contracts, which spikes volume. Add in quarterly index rebalancing, and you've got portfolio managers trading to match index changes—it's all straightforward mechanics driving the action.
The Four Derivatives Involved
Let's break down the derivatives: stock options let you buy or sell shares at a set price before expiration—calls for betting on rises, puts for declines. Index options are similar but based on an index's value, cash-settled and exercisable only at expiration. Index futures obligate you to buy or sell at a future price, useful for hedging. Single stock futures, though no longer in the U.S., were commitments to deliver shares at expiration. That's the core of what expires and why trading picks up.
How It Affects Markets
On these days, you see heavy volume from in-the-money options exercising automatically, requiring share deliveries for calls and puts. This doesn't always mean more volatility, but the increased activity is real—traders offset, close, or roll positions to avoid unwanted deliveries. For instance, with an E-mini S&P 500 future, you can cash settle or roll it forward instead of taking delivery.
Arbitrage Opportunities
During the day, large contract blocks can cause temporary price distortions, opening doors for arbitrage. You might profit from these if you're quick, but remember, the same activity can lead to fast losses too. Gains are often modest, and the risks match the rewards—approach it technically, without getting caught up in the hype.
Case Study and FAQs
Take March 15, 2019, as an example: trading volume hit 10.8 billion shares, way above average, due to the witching frenzy. It's hard to isolate gains from expirations versus other factors like earnings. As for why it's called 'witching,' it's from folklore, but really, it's about the trading surge. Traders care because volumes rise, and quirks like strike pinning can create uncertainties. Bottom line, these days boost activity without guaranteed volatility—use this knowledge to position yourself effectively.
Pros and Cons of Quadruple Witching
- Provides arbitrage chances from price distortions.
- Increases trading volume, potentially leading to market gains.
- Gains are usually modest.
- Risk of losses is as high as potential profits.
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