# Options Expiration and Triple Witching

> Triple witching is when stock options, index options and index futures expire together. Learn when it happens, why volume spikes and how traders prepare.

Source: https://learn.tradelabsai.com/macro/triple-witching/  
Track: Economics and Macro · Level: Intermediate · Updated: 2026-10-03  
Publisher: TradeLabs AI (https://tradelabsai.com). Education, not financial advice.  
Cite as: TradeLabs Learn, "Options Expiration and Triple Witching", https://learn.tradelabsai.com/macro/triple-witching/

Triple witching refers to the third Friday of March, June, September and December, when three kinds of derivatives expire on the same day: stock options, stock index options and stock index futures. Single stock futures once made it "quadruple witching", but those contracts no longer trade in the US. The simultaneous expirations, combined with index rebalancing that often happens on the same day, create some of the highest trading volumes of the year, especially at the open and the close.

## What expires

| Contract | Settlement | Notes |
|---|---|---|
| Stock index futures (such as E-mini S&P 500) | Cash, based on a special opening quotation | Settle at the open on the third Friday |
| Stock index options (such as SPX monthly) | Cash, many AM settled on the opening price | Some PM settled at the close |
| Single stock and ETF options | Physical delivery of shares | Expire at the close |

See [Option Expiration Dates](https://learn.tradelabsai.com/options/option-expiration-dates/) and [Contract Months and Expiration](https://learn.tradelabsai.com/futures/contract-months-and-expiration/).

## Why volume spikes

- **Futures rolls:** traders roll index futures from the expiring contract to the next quarter in the days before. See [Rolling Futures Contracts](https://learn.tradelabsai.com/futures/rolling-futures-contracts/).
- **Options expirations:** in the money options are exercised, creating stock trades; hedges are unwound.
- **Index rebalancing:** S&P Dow Jones Indices applies quarterly rebalances effective after the close on the third Friday, so index funds trade in the closing auction. See [Index Rebalancing](https://learn.tradelabsai.com/fundamentals/index-rebalancing/).
- **Hedge adjustments:** market makers adjust delta hedges as large option positions expire. See [Delta Hedging](https://learn.tradelabsai.com/options/delta-hedging/).

## The opening and closing auctions

| Time | What happens |
|---|---|
| Opening auction | Special opening quotation (SOQ) sets the settlement price for AM settled index futures and options |
| Closing auction | Single stock options expire; index rebalance trades execute; very large volumes |

**Example: A triple witching close**
On a typical day, the closing auction on US exchanges might match around 10% of daily volume. On triple witching days that coincide with major index rebalances, closing auction volume can be several times larger, and total US equity volume can be among the highest of the year. A trader placing a large market on close order may face price moves in the final minutes as imbalances are published. See [Opening and Closing Auctions](https://learn.tradelabsai.com/market-structure/opening-and-closing-auctions/).

## Does triple witching move prices?

Despite the volume, research has found little evidence that triple witching days systematically push markets up or down. Effects tend to be:

- **Higher intraday volatility** around the open and close.
- **Temporary price distortions** in individual stocks with large open interest or index flows.
- **Pinning:** stocks sometimes gravitate toward strike prices with large open interest into expiry. See [Options Open Interest Analysis](https://learn.tradelabsai.com/options/options-open-interest-analysis/).

## How traders prepare

1. **Know the dates:** the third Friday of March, June, September and December.
2. **Expect large closing auction volumes** and plan order timing.
3. **Roll futures early** to avoid illiquid final days.
4. **Close or roll options** you do not want exercised. See [Exercise and Assignment](https://learn.tradelabsai.com/options/exercise-and-assignment/).
5. **Watch imbalance data** published before the close.
6. **Be aware of rebalance additions and deletions** announced in advance.

## Monthly and daily expirations

Monthly options expire on the third Friday of every month, and weekly and daily options on major indices now expire every trading day. Some argue this has spread expiration activity more evenly, reducing the relative importance of triple witching, though quarterly expirations remain large. See [Option Expiration Dates](https://learn.tradelabsai.com/options/option-expiration-dates/).

## Frequently asked questions

### What is triple witching?

The third Friday of March, June, September and December, when stock options, index options and index futures expire on the same day.

### Why is volume so high on triple witching?

Because of simultaneous expirations, futures rolls, hedge adjustments and quarterly index rebalancing trades in the closing auction.

### Does triple witching affect stock prices?

It increases volume and intraday volatility, but research has found little evidence of a consistent effect on market direction.

You have finished the Macro track. Continue with data sources, starting with [Market Data Explained](https://learn.tradelabsai.com/alternative-data/market-data-explained/).

## Continue learning

- Previous lesson: [Trading Economic Releases](https://learn.tradelabsai.com/macro/trading-economic-releases/)
- Related: [Trading Economic Releases](https://learn.tradelabsai.com/macro/trading-economic-releases/): Economic data releases cause sharp moves in rates, currencies and stocks. Learn the key US releases, how surprises are measured and how to manage the risk.
- Related: [Option Expiration Dates](https://learn.tradelabsai.com/options/option-expiration-dates/): Every option has an expiration date when it must be used or expire. Learn monthly, weekly and 0DTE cycles, what happens at expiry and how to choose an expiration.
- Related: [Contract Months and Expiration](https://learn.tradelabsai.com/futures/contract-months-and-expiration/): Futures trade in specific contract months with letter codes and fixed expiry rules. Learn month codes, the front month, quarterly cycles and how expiry works.
- Related: [Opening and Closing Auctions](https://learn.tradelabsai.com/market-structure/opening-and-closing-auctions/): Exchanges open and close with auctions that match orders at one price. Learn how auctions work, imbalance data, why the close is so busy and how traders use it.
- Related: [Rolling Futures Contracts](https://learn.tradelabsai.com/futures/rolling-futures-contracts/): Rolling moves a futures position from an expiring contract to a later one. Learn when to roll, how to use calendar spreads, roll costs and common roll schedules.
- Related: [Index Rebalancing](https://learn.tradelabsai.com/fundamentals/index-rebalancing/): Index rebalancing forces funds to buy additions and sell deletions. Learn how S&P 500 and Russell changes work, the index effect and closing auction flows.