Expiration

Q: What is expiration in trading?

The date an options contract ceases to exist. After expiration the contract is gone. In-the-money options are typically exercised automatically; everything else expires worthless.

The date an options contract ceases to exist.

Also called: expiry · expiration date · dte

Written by Javier Sánchez Ros

In plain language

After expiration the contract is gone. In-the-money options are typically exercised automatically; everything else expires worthless.

Time remaining is a core input to an option’s value. As expiration approaches, extrinsic value decays toward zero, and the decay accelerates in the final weeks.

Near expiration options become extremely sensitive: small moves in the underlying produce large percentage swings in the option price.

Worked through

The thesis was correct, and the option expired first

Call bought: $65 strike, 30 days
Stock at expiry: $63.80
Option worth: $0
Stock nine days later: $71.40

The view was right. The stock did exactly what was expected and did it nine days after the contract ceased to exist, which for the holder is indistinguishable from having been wrong.

This is the property that makes options fundamentally different from shares. A stock position can be wrong for a year and still be rescued; an option has a date attached, and after that date being right is worth nothing.

It means an options trade requires two predictions rather than one — direction and timing — and the second is considerably harder. A trader who would confidently say "this goes up" is often much less confident saying "this goes up within four weeks", and the option requires the second statement.

Which is why buying more time is usually money well spent. A longer-dated contract costs more premium and decays more slowly, and it removes the failure mode where the analysis was sound and the calendar was not.