Options expiration and quad witching: what they do to ES and NQ, and how to trade them

What expires, and when

US stock and index options have a standard monthly expiry on the third Friday of every month. Four times a year, on the third Friday of March, June, September and December, the quarterly stock index futures expire on the same day. Traders call that quarterly Friday triple or quadruple witching. The two names mean the same day and only differ in whether single-stock futures are counted.

For a day trader in ES or NQ, what matters is when each contract stops and what price it settles on, because those two moments shape the open and the close.

Why expiry can change how the market trades

Market makers who sell options usually hedge them, in the futures or in the underlying stocks, and adjust those hedges as price moves. How much adjusting an option needs changes fastest when it is close to expiring and close to the current price. So in the last hours of an option's life, the hedging around heavily traded strike prices can become a force on the market in its own right.

Which way that force pushes depends on how dealers are positioned. When they hold more options than they have sold, their hedging leans against the move: they sell into rallies and buy the dips, which can hold price in a range around a large strike. That pull is called pinning. When they are short options, their hedging adds to the move instead. The evidence for pinning is clearest in individual stocks. In the index it is weaker, and nobody can tell you in advance which strike, if any, will hold.

Same-day options have also spread this across the week. More than half of SPX options volume in 2026 has been in contracts that expire on the day they trade, so hedging that once built up into the third Friday now happens in smaller doses every session. The monthly expiry still matters, because large positions still build up in the standard monthly contracts, but it is less of a single event than it was.

A quarterly expiry is not a monthly one

An ordinary monthly expiry is mostly an options event. A quarterly one adds two things at either end of the session.

• At the open, the expiring ES and NQ futures settle on the special opening quotation, alongside the standard monthly SPX and NDX options. The quotation is built from each stock's own opening trade, so the first minutes can print unevenly while the last stocks open.
• At the close, index funds trade the S&P 500 and Nasdaq-100 quarterly rebalances, which take effect once that session is over. That makes the closing auction on a quarterly Friday one of the heaviest of the quarter.

Our Volatility Scale, which ranks each session before the open, treats the two as separate inputs for exactly this reason: monthly options expiration is one, quarterly witching is another, and they don't have to push the same way.

The roll: switching to the next contract

ES and NQ trade in quarterly contracts, lettered H for March, M for June, U for September and Z for December, so the December 2026 E-mini S&P is ESZ6. Most traders don't hold the expiring contract into its final morning. Volume moves to the next one about eight days before expiry, on the Thursday of the week before. That date is a convention rather than a rule: the real signal is the day the new contract's volume overtakes the old one's.

The two contracts trade at different prices, because the later one prices in three more months of interest rates minus dividends. So a level you drew on the September contract sits at a different number on December's, and a continuous chart that joins them either shows a gap at the roll or adjusts the older prices to hide it. Check which one your platform shows before you trust a level from before the roll.

How to trade an expiry day

Most of what makes expiry different happens at known times, which makes it easier to plan around than a news day.

A few habits cover most of it:

• Know which kind of expiry it is. A monthly Friday and a quarterly one are different days, with different opens and very different closes.
• Be on the right contract. After the roll, the old contract is thin and its prices are not the ones everybody else is watching.
• Let news outrank the pin. A scheduled release or an unexpected headline will move the market through any strike. Check the calendar as you would on any other day. Our guide to how CPI, jobs reports and Fed days move stocks covers the releases that do it most.
• Respect the last hour. On quarterly Fridays, being flat before 3:50 PM ET costs little, and the closing auction can move the index sharply in a matter of minutes.
• Size to the day, not the date. Expiry doesn't make every Friday small or large. Estimate how far this one is likely to go, as in our guide to how many points ES and NQ move in a day, and set stops and size from that.

What this September's expiry did

Friday 18 September 2026 was a quarterly expiry, and a busy one. It came two days after the Federal Reserve raised interest rates for the first time since 2023, and after a volatile week the 20-day average range for ES had widened to about 62 points. The Nasdaq-100's quarterly rebalance was also set to more than double SpaceX's weight in the index, with estimates published that week putting the index funds' buying at $15.5 billion or more, all of it aimed at the closing auction.

The session itself was smaller than that average. As our Volatility Scale measured it, ES covered about 43 points from high to low, around 0.7 times its 20-day average range, and NQ about 273 points, around 0.8 times. Neither made much net progress: the S&P 500 finished up 0.17% and the Nasdaq Composite up 0.4%.

None of that could have been read as a direction beforehand. What the date did give a trader, before the open, was the timetable: the settlement at 9:30 and the largest flows of the day scheduled for 4:00.

The next expiry dates

Monthly options expire on the third Friday of each month. The quarterly Fridays, when ES and NQ futures expire as well, are marked below.

Expiry is one of the kinds of day worth recognising before the open. Our guide to when not to day trade covers the others, and none of this is advice about your money.