Pin Risk

The risk that a stock price settles exactly at the strike price when it expires. For option sellers, pin risk means there exists uncertainty around how many contracts may get assigned. For owners of options, last second moves in the underlying can quickly change in-the-money (ITM) options to out-of-the-money (OTM) options, and vice versa. Pin risk can translate to an unwanted long or short delta exposure on the Monday after expiration.

This is a definition, not a recommendation. Options carry risk and can expire worthless. See how the desk actually trades at TrueTrader.