Expiration Date Definition

The expiration date is the date on which the option expires, but its importance goes beyond a calendar marker. In the playbook, expiry affects flexibility, time decay and what may happen through automatic exercise or assignment.

The expiration date is the date on which the option contract reaches expiry. The article stresses that expiry is operationally important because days to expiry affect how much time a thesis has to work, how quickly theta may erode time value, and how much flexibility remains to adjust or close the position. Short-dated options can suit short timing views, but they leave less room to be right and can enter the fastest part of time decay more quickly. Expiry also matters because expiring in-the-money options are generally subject to automatic exercise procedures unless contrary instructions move through the clearing chain, while short positions may be assigned. For that reason, the playbook prefers pre-written exit rules and often earlier, cleaner management rather than relying on formal expiry handling.

• Options Basics
• Theta
• Information memo on exercise-by-exception