What is options expiration (OpEx) and why does it move markets?

Short answer

OpEx (options expiration) is when contracts stop trading and settle. Standard monthly options expire on the third Friday of each month. Because dealers hedge large open positions, prices can stay pinned near heavy strikes into OpEx and then move more freely once those positions roll off.

SPY gamma levels, live

As of Oct 16, 7:49 PM ET

Key expiration dates

Weekly options: every Friday (and daily for SPX, SPY, QQQ).
Monthly: third Friday of the month.
Quarterly “triple witching”: third Friday of March, June, September and December, when stock options, index options and futures all expire.

Why it matters

As expiration nears, gamma near heavily traded strikes grows, and dealer hedging can hold price close to them. After OpEx, that hedging fades, which is why some traders expect bigger moves the following week.

Common questions

What happens to my option at expiration?

In-the-money options are usually exercised automatically; out-of-the-money options expire worthless.

Is OpEx week more volatile?

Not always. Pinning can make it calmer, with volatility arriving after expiration.

What is the gamma wall’s role at OpEx?

Walls are strongest just before expiration and often shift right after it.

Go deeper with Rebel Intel

When is the next monthly OpEx?Show me SPY gamma levels into expiration What is max pain for SPY this Friday?

Educational only, not investment advice. Options involve risk and are not suitable for all investors. See how Intel is reviewed.