Exercise, Assignment, and Expiration: What Can Happen

Exercise is the holder’s use of the contractual right. Assignment is the seller’s obligation to perform after the clearing process allocates an exercise.

Long options

A holder may close the option, exercise it under applicable rules, or allow it to expire. Exercising can discard remaining extrinsic value, so compare alternatives carefully.

Short options

A seller can be assigned before expiration for many American-style equity options. Assignment can create a long or short stock position and related financing, dividend, or tax consequences.

Automatic exercise policies

Brokers and clearing organizations can apply exercise-by-exception thresholds and risk controls, but account-level handling varies. Do not assume an in-the-money option will be handled exactly as expected.

Expiration risk

Prices can move after the regular close, and assignment information can arrive later. Multi-leg spreads can leave unexpected stock exposure if one leg is exercised or assigned and another is not.