Quadruple witching: quarterly expiration and the index futures roll

What expires and why it is called witching

Stock index futures on CME expire quarterly. On the third Friday of the contract month, the expiring E-mini contract stops trading at 9:30 a.m. Eastern and is settled on a Special Opening Quotation, a value of the index computed from the opening prices of its component stocks that morning. Standard monthly index options and single-stock options expire the same day. The name refers to the simultaneous expiry of several derivative types; many now say triple witching, since single-stock futures stopped trading in the US in 2020.

Major index providers also schedule quarterly rebalances around the same period, which adds to closing-auction volume in the cash market.

The roll before expiry

• Most traders do not hold index futures to expiry; they roll into the next quarterly contract in the days before.
• As open interest moves, the expiring contract's volume and depth decline while the next contract becomes the front month.
• The price difference between the two contracts reflects carry: interest rates minus expected dividends until the later expiry.
• Charts built on the expiring contract become thin and can mislead in the final days.

Why expiration days trade differently

Positions tied to the expiring futures and options must be closed, rolled or settled, which concentrates volume at the cash open and close. Options dealers who hedge large open interest near specific strikes adjust their hedges as expiry approaches and after it, which can change intraday dynamics; after a quarterly expiry, a large share of open interest disappears, and the gamma exposure computed from the options chain can look very different the next session.

Order flow on witching day

In index futures, the morning auction on the next contract can be busy as final roll and hedge adjustments go through around the 8:30 CT open. Volume often builds again into the cash close at 3:00 CT, where closing-auction imbalances and index rebalances concentrate. On the footprint, bars around those times can show large two-sided volume with little net price progress, a sign of matching flows rather than directional aggression.

A practical point: volume profile and cumulative delta computed across the roll mix two contracts if the chart switches symbols mid-history. Reading the next contract from the day its volume dominates avoids comparing numbers from two different books.

In Senzoukria

Senzoukria's default contract selector uses each product's expiry rule: for index futures, the third Friday of the contract month, with the default moving to the next quarterly contract eight calendar days before. A remembered symbol that has expired is replaced at launch by the live contract of the same root, so a chart does not stay subscribed to a dead contract.

The GEX module computes gamma exposure from the loaded option chain and can aggregate all expiries, 0DTE or 1DTE; its History page records the call wall, zero gamma and put wall once a minute, which shows how the levels shift across an expiration. The GEX levels overlay projects those levels onto the futures chart.