On the third Friday of March, June, September and December, three classes of listed derivatives expire on the same session in the US market: index futures, index options and equity options. Add single stock futures where they trade and the trading desks call it quadruple witching. The mechanical part is not mysterious. Positions worth a very large notional have to be closed, rolled or settled inside a narrow window, and much of that happens in the closing auction.
The effect that matters for a screen trader is simpler than the folklore. Around expiry, a meaningful share of the flow hitting the tape is not opinion. It is hedging, unwinding and rolling. Price can move hard on volume that carries no information about where the market is going next.
What actually expires, and when
Different products settle on different clocks, and mixing them up is the usual source of confusion.
US index options on the S&P 500 settle against a special opening quotation calculated from the opening prints of the constituents on expiry Friday morning, not against the close. Equity options settle on the Friday close. Index futures roll during the preceding week, with most open interest moving from the front contract to the next quarter over a few sessions. In FX, the relevant expiry is the daily 10am New York cut, when vanilla currency options struck for that date fall due, and month-end fixings pull spot around for a different reason again.
Because the settlement references differ, an expiry can produce a violent opening range and then a quiet afternoon, or a flat morning and a hectic close. Knowing which product is expiring tells you which part of the session to expect the noise in.
Pinning, and why it is not a conspiracy
Prices sometimes gravitate toward heavily traded strikes as expiry approaches. Dealers who are short options and hedging delta buy as price falls and sell as it rises, which damps movement near the strike. When a lot of open interest sits at one level, that damping is visible: the market grinds sideways in a band while every attempt to break out gets absorbed.
It is a hedging artefact, not manipulation, and it fades the moment the options are gone. Traders who build a strategy on pinning usually discover that the pin only holds while the gamma exposure that produced it is still on the books. The day after expiry, the same level offers no support at all.
Expiry flow is not a prediction. It changes the character of price movement for a few hours, and the change reverses when the positions are gone. Trading it is a short window with an abrupt end.
Index rebalances land in the same week
The quarterly reviews of major index providers often take effect at the same closing auction. When a stock enters or leaves an index, every passive fund tracking it must trade the change, and they nearly all trade it at the close to minimise tracking error. That produces the largest single-print volumes of the quarter in the affected names.
For an index CFD trader the practical consequence is at the level of the index itself: closing auction volume can be many multiples of a normal session, and the last few minutes print ranges that look absurd on a five minute chart. If you hold index exposure, read our guide to trading indices for how cash and futures pricing differ across that window, because the cash index and the front future can diverge briefly while the auction clears.
Execution risk around the bell
Higher volume is not the same as better execution. In the final minutes of an expiry session, quoted spreads on derivative products widen while the underlying auction is being determined, and market orders can fill some distance from the last screen price. This is ordinary slippage behaving exactly as you would expect when depth is concentrated in an auction rather than the continuous book.
Three habits reduce the damage. Size down before the window rather than after. Use limit orders where your platform allows them, and accept a missed fill as the cost. And check the contract specification for the instrument you hold: some index CFDs are priced off a futures contract that is rolling, which means your position may be adjusted for the price difference between the old and new contract. That adjustment is not a loss or a gain, but it looks like one on the equity curve if you do not know it is coming.
FX expiries: the 10am New York cut
Currency options expire daily at 10am New York time, and banks publish indicative strike sizes for the majors ahead of the cut. A large expiry near the current spot level can hold price in a range through the morning for the same delta hedging reason as an equity pin. After 10am the anchor disappears and the pair often resumes whatever it was doing before.
This is worth building into a session routine rather than a strategy. If your trade plan involves a breakout in EURUSD at 09:30 New York, a large strike sitting 15 pips away is useful context. Our note on forex trading sessions covers where the New York cut sits relative to the London close and the overlap.
How to use expiry dates without over-fitting
Mark them on the calendar and change your behaviour, not your bias. The quarterly expiry weeks in March, June, September and December, the monthly equity option expiry on the third Friday, month-end fixings at 16:00 London, and the daily FX cut at 10am New York cover most of it. An economic calendar will show the scheduled data around them, which is what usually supplies the actual direction while expiry flow supplies the volatility.
The failure mode is building a rule like "the market rallies into September expiry". Sample sizes on quarterly events are tiny, four observations a year, and any pattern you find in them is likely to be noise. The useful version is defensive: on these dates, expect wider spreads, expect a violent close, expect levels to hold for reasons that will evaporate by Monday, and trade smaller if you trade at all.
"Expiry does not predict direction. It tells you that the order flow you are looking at may have nothing to do with an opinion about price, and that is worth knowing before you fade it."
— Alex Onta, Executive Director, SINGUARD
Key Takeaways
- Quarterly witching means index futures, index options and equity options expire in the same session, concentrating flow into the close.
- Index options often settle against a special opening quotation, so the noise can be at the open rather than the close.
- Pinning near heavy strikes is a dealer hedging artefact and it stops working the moment the options expire.
- Treat expiry dates as a reason to size down and use limits, not as a directional signal from a four-per-year sample.
Frequently Asked Questions
What is triple witching?
Triple witching is the simultaneous expiry of index futures, index options and equity options on the third Friday of March, June, September and December. Where single stock futures also trade, the same session is called quadruple witching. The main visible effect is a large jump in volume in the closing auction.
Does expiry make prices go up or down?
Neither reliably. Expiry flow comes from hedging, rolling and settlement rather than from a view on price, so it adds volatility without adding direction. Any seasonal pattern claimed for quarterly expiries rests on four observations a year, which is far too small a sample to trade.
What is the 10am New York cut in FX?
It is the daily expiry time for vanilla currency options. Large strikes near the current spot rate can hold a pair in a narrow range through the morning because dealers hedge their delta against the strike. Once the cut passes, that anchor disappears and normal movement resumes.
About the Author
Alex Onta is an Executive Director at SINGUARD. He built eTrader, the terminal, the mobile apps, eTrader Broker, Copytrading, Business and Community, along with the worldwide clustered-server infrastructure it all runs on, with his brother Roman Onta helping on the design, and he leads that division today. Together with Roman he builds the Prop Firm CRM, the Broker CRM, Scalegram and CopySignals, and the two of them carry worldwide compliance, payment processing and international business structuring side by side. He lives and works in Dubai for most of the year. Meet the executive duo leading Singuard's five divisions.