What Is Triple Witching and Does It Move Markets?
Direct answer
Triple witching in brief
Triple witching is the quarterly expiration of three kinds of derivatives on the same day: equity options, stock index options and stock index futures. It normally falls on the third Friday of March, June, September and December; the next is Friday, December 18, 2026. Volume is typically very heavy, especially at the close, because positions are rolled or closed and index funds rebalance on the same day, but the direction of prices on and after the day is not reliably predictable.
- Quarterly expiry of stock options, index options and index futures
- Usually the third Friday of Mar, Jun, Sep, Dec (moved to Thursday if Friday is a market holiday)
- Next dates: Dec 18, 2026
- Mar 19, 2027
- Very high closing volume
- S&P 500 quarterly rebalances take effect the same day
Four times a year headlines warn about "triple witching". The name sounds dramatic; the reality is mainly a scheduling coincidence that concentrates trading into one session.
What people on X are asking
In September 2025 a reply under a market commentator's post simply asked what triple witching is. In December 2025 a widely followed crypto account linked it to bitcoin, noting that bitcoin dropped after the last three triple-witching events before explaining the term. And in June 2025 a joke post asked what triple witching is, answering that it's when "your longs vanish and your shorts reverse". Three observations are a pattern only in hindsight; here are the mechanics.
The fact-checked answer
What expires. On the third Friday of the quarter months, three categories expire together: options on individual stocks and ETFs, options on stock indices (for example SPX quarterly options), and stock index futures such as CME's E-mini S&P 500. The term was "quadruple witching" when US single-stock futures also traded; that market closed in 2020.
How settlement works. E-mini S&P 500 futures and standard SPX options settle to a Special Opening Quotation calculated from the opening prices of the index's stocks on expiry morning. Many traders roll futures to the next quarter in the week before expiry rather than holding to settlement. Stock options that finish in the money are exercised into shares, which creates stock buying and selling around the close.
Why volume spikes. The same day is also when S&P Dow Jones Indices' quarterly rebalances take effect after the close, and when many index funds trade to match. The combination produces some of the heaviest closing auctions of the year.
Upcoming triple-witching dates
Third Fridays computed by UXS. In June 2026 the third Friday (June 19) was the Juneteenth market holiday, so that expiry moved to Thursday, June 18. Always confirm with the exchange calendar. Tap a column header to sort.
| Q4 2026 | Friday, Dec 18, 2026 | Also S&P quarterly rebalance |
| Q1 2027 | Friday, Mar 19, 2027 | |
| Q2 2027 | Friday, Jun 18, 2027 | Juneteenth falls on Saturday June 19; check the exchange holiday calendar, which may move expiry to Thursday |
| Q3 2027 | Friday, Sep 17, 2027 | |
| Q4 2027 | Friday, Dec 17, 2027 |
Does it move prices? Expiry can pull prices towards strikes with large open interest during the week ("pinning") and can amplify intraday swings, but the effect on direction is inconsistent. Bitcoin is not part of US equity expiries; any link is indirect through risk sentiment. Compare normal swings in what the VIX is.
What it means for you. For buy-and-hold investors, nothing needs to change. For active traders: expect heavy volume near the close, wider moves in heavily optioned stocks, and roll futures before the expiry week if you do not want settlement. Prop traders in futures should check their firm's rules on contract rolls.
Free PDF
Expiry-day checklist (PDF)
For traders with options or futures positions in a quarterly expiry week.
Positions
| Instrument | Expiry date | In / out of the money | Plan (close / roll / let expire) |
|---|---|---|---|
Before expiry week
- Futures roll date chosen (front month to next quarter)
- In-the-money options: exercise or assignment consequences checked
- Cash or margin available for any assigned shares
- Exchange holiday calendar checked for moved dates
On the day
Fill-in fields in the PDF: Maximum size I will trade into the close; Stocks with heavy open interest I hold; Notes after the close.
Download the PDF (44 KB, made by UXS, no sign-up)
Monthly and weekly expiries. Triple witching is the quarterly version of a monthly cycle. Standard equity and index options also expire on the third Friday of the other eight months, and many index and ETF options now have weekly and even daily expirations. The quarterly dates stand out because index futures expire and index rebalances take effect at the same time, which is why closing volume is so heavy on those four days.
September also has a reputation of its own; see whether September really is the worst month for stocks.
For a single option buyer, see how much you can lose buying a call or put.
Daily expiries are now far more common; see why 0DTE options are so popular and how risky they are.
Decision helper
| You hold… | Before triple witching |
|---|---|
| Index funds only | No action needed |
| Futures you want to keep | Roll to the next quarter during roll week |
| Short options near the money | Plan for possible assignment |
| Long options in the money | Decide whether to exercise or sell before expiry |
Common mistakes
- Holding short in-the-money options into expiry without the cash or margin for assignment.
- Expecting a reliable direction on witching day.
- Forgetting that futures stop trading and settle to the opening quotation.
- Missing a holiday that moves the expiry date.
FAQ
When is the next triple witching?
Friday, December 18, 2026, then March 19, 2027.
Why is it called triple witching?
Three types of contracts expire on the same day; "witching hour" refers to the final hour of trading.
Is triple witching bad for stocks?
There is no reliable direction. Volume and intraday swings are higher, especially into the close.
What is quadruple witching?
The older name when single-stock futures also expired; those contracts are no longer listed in the US.
Does triple witching affect crypto?
Not directly. Crypto derivatives have their own expiry schedules.
Should long-term investors do anything?
No. It is a trading-mechanics event, not a change in company value.
Sources
- CME Group: E-mini S&P 500 futures contract specs
- Cboe: SPX options product specifications
- NYSE: Holidays and trading hours
- S&P Dow Jones Indices: S&P U.S. Indices methodology
Facts checked November 10, 2026. X posts are cited as evidence of the question, not of the answer.