What Is Triple Witching? Triple Witching Day Explained

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Triple witching is the quarterly day when three kinds of US equity derivatives expire at the same time: stock options, stock index options and stock index futures. It falls on the third Friday of March, June, September and December. The “triple witching hour” is the last hour of regular trading that day, from 3 p.m. to the 4 p.m. Eastern close. Its main effect is a concentration of trading as holders close, roll or settle positions that would otherwise expire. The day does not by itself signal anything about where prices are headed.

The three contracts that expire together

• Stock options give the holder the right, but not the obligation, to buy (call) or sell (put) a specific stock at a set strike price.
• Stock index options apply the same right to an index such as the S&P 500 or the Dow Jones Industrial Average. They are usually cash-settled, so no shares change hands.
• Stock index futures obligate the buyer to buy, and the seller to sell, the value of an index at a price agreed today for a set future date. Unlike an option, a futures contract is binding on both sides.

Options on individual stocks expire every month, and index options and futures have their own cycles. Only in March, June, September and December do all three line up on the same Friday.

When triple witching happens

How to find the date

The third Friday of a month always falls between the 15th and the 21st. To check whether a given day is triple witching, confirm two things:

1. The month is March, June, September or December.
2. The day is the Friday falling between the 15th and the 21st.

When the third Friday is a US exchange holiday, expiration generally moves to the preceding business day. June 2026 is such a case: June 19 is Juneteenth, a market holiday, so June expirations move to Thursday, June 18.

Triple witching dates for 2026 and 2027

2026

• March 20
• June 18 (Thursday, because June 19 is a market holiday)
• September 18
• December 18

2027

• March 19
• June 18
• September 17
• December 17

Confirm holiday adjustments against the exchange calendar for the specific contract you hold.

How positions are handled at expiration

Most trading on triple witching day comes from deciding what to do with contracts about to expire, and the choices differ for futures and options.

Futures: offset, roll or settle

A futures contract held to expiration must be settled. Traders who only want price exposure, and not the settlement itself, usually close the position before the deadline. They do this by booking an opposite trade at the prevailing price. The gain or loss is the difference between the entry and exit prices.

Hypothetical example (contract size). The E-mini S&P 500 futures contract has a multiplier of $50 per index point. If the index stood at 4,000, one contract would represent:

$50 × 4,000 = $200,000 of notional exposure

A trader long one contract at 3,950 who sells it at 4,000 before expiration realizes (4,000 − 3,950) × $50 = $2,500. That figure is before commissions and fees, counted as one round trip.

To keep the exposure after the current contract expires, the trader rolls the position: sell the expiring contract and buy the next quarterly contract at the same time. Rolling creates two trades per position, one closing and one opening. When many index futures holders roll in the same window, the result is heavy, two-sided volume.

Options: exercise, assignment or expiry

Options at expiration fall into two groups:

• In the money (ITM): a call whose underlying trades above the strike, or a put option whose underlying trades below the strike. ITM options are typically exercised automatically at expiration. This triggers trades between holders and the sellers who are assigned.
• Out of the money: these expire worthless and generate no transaction.

Hypothetical example (covered call). An investor owns 100 shares of a stock and has sold one call with a $50 strike expiring on triple witching Friday. If the shares close at $52, the call is in the money and the shares are likely to be called away at $50. The investor has two choices:

• Buy back the call before the close to keep the shares, paying whatever the option is worth at that moment.
• Let assignment happen and deliver the shares at $50.

Settlement timing: open versus close

Not everything settles at the closing bell. Standard monthly S&P 500 index options (SPX) and E-mini S&P 500 futures settle to a special opening quotation. That value is calculated from the opening prices of the index’s component stocks on expiration morning, which means some of the price impact can land at the Friday open. Single-stock options and PM-settled index products are tied to the close. As a result, triple witching activity can show up twice on the same day: once around the opening auction and again into the final hour.

Why volume rises, and what it does not prove

Several flows tend to cluster on the third Friday of a quarter-end month:

• Closing and rolling of expiring index futures.
• Exercise and assignment of in-the-money stock and index options.
• Hedge adjustments by dealers and market makers as positions run off.
• Quarterly index rebalancing. The S&P 500’s quarterly rebalance takes effect after the close on the same third Friday, so index funds that track it trade into the closing auction.

These flows are mechanical, and many offset one another: volume measures how much changes hands, not which way prices move. A fund selling expiring futures may be buying the next contract at the same moment, and a dealer unwinding a hedge may be trading against an arbitrageur.

Historical example. March 15, 2019, was the first triple witching day of that year. Volume on US exchanges reached about 10.8 billion shares, against an average of roughly 7.5 billion over the previous 20 sessions. Yet the S&P 500 rose only about 0.50% and the Dow about 0.54% that day. Most of that week’s gains (the S&P 500 finished the week up 2.9%) came before Friday. It is a single instance, but it shows that volume and price change can diverge.

Pinning, gamma hedging and pin risk

One of the more distinctive effects of expiration is pinning, when a stock closes very near the strike price of heavily traded options.

The mechanism runs through dealer hedging. Market makers who sell options often hedge so that small moves in the stock do not change their overall position. An option’s delta, its sensitivity to the underlying price, changes fastest near the strike as expiration approaches. That rate of change is gamma, one of the option Greeks. Dealers who adjust hedges to keep delta neutral (gamma hedging) may buy as the price dips toward a large strike and sell as it rises above it. When the strike carries large open interest, this hedging can hold the price near the strike into the close.

Pinning creates pin risk for option writers. If a stock closes just above or below a strike, an option seller cannot be sure whether the holder will exercise. Holders may exercise or decline to exercise based on after-hours moves or their own plans. The writer could wake up on Monday holding an unexpected long or short stock position, exposed to whatever happens over the weekend. Closing short options near the strike before expiration is one way to remove that uncertainty.

Pinning is a tendency, not a rule. Large news, broad market moves or offsetting flows can easily overwhelm hedging pressure.

Effects on individual stocks

Triple witching can move individual stocks apart from the broad market, especially stocks with large expiring options positions or heavy derivatives trading relative to their share volume, including smaller companies with active options markets. These moves come from position management, not new information about the company. A stock that jumps or slides into the close on expiration Friday may give the move back the following week once the flows are gone.

Strategies traders use around triple witching

Arbitrage. The burst of orders can briefly push futures, options and the underlying shares out of their usual price relationships. Arbitrage traders try to buy the cheaper side and sell the richer one, often in large round-trip trades completed in seconds. These gaps are small and short-lived. In practice they are contested by firms with fast execution and low trading costs.

Volatility positioning. Some traders hold a straddle, a call and a put with the same strike and expiration, to profit from a large move in either direction. A straddle loses money if the price stays near the strike. Pinning is exactly that outcome, so the two ideas pull against each other on expiration day.

Avoiding the window. For long-term investors, the practical approach is often to avoid placing large market orders into the final hour or the closing auction. On triple witching days, prices in that window can reflect expiration flows more than value.

Triple witching versus related terms

The term quadruple witching applied while single-stock futures traded in the US alongside the other three contracts. Those futures never attracted much capital and stopped trading in 2020, so any current reference to quadruple witching describes the same three-contract event.

Weekly and daily options have added many more expiration dates over the years, but they did not replace the third Friday. Standard monthly contracts still expire then, and the quarterly alignment with index futures is unchanged.

“Witching” comes from the folklore of the witching hour, when strange things are said to happen. Traders applied it to the unpredictable final hour of expiration Fridays. “Triple” counts the three contract types.

Limitations of the concept

• It concerns US equity derivatives. Currency futures follow their own quarterly cycle and settlement rules, so triple witching dates are not the expiration dates for foreign exchange contracts.
• Overlapping events complicate the picture. Index rebalancing, economic releases and company news on the same day make it hard to attribute any single move to expiration alone.

The Bottom Line

Triple witching matters most to traders holding expiring futures or options, who must offset, roll, exercise or let positions settle, and to option writers facing pin risk near a strike. The heavy volume it brings is largely mechanical and says nothing about market direction. Long-term investors can sidestep expiration distortions by avoiding large market orders in the final hour or the closing auction.