Options Glossary

Gamma: A measure of the rate of change in an option's delta for a one-unit change in the price of the underlying stock. See also Delta
Good-'til-cancelled (GTC) order: A type of limit order that remains in effect until it is either executed (filled) or cancelled, as opposed to a day order, which expires if not executed by the end of the trading day. A GTC option order is an order which if not executed will be automatically cancelled at the option's expiration.

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This web site discusses exchange-traded options issued by The Options Clearing Corporation. No statement in this web site is to be construed as a recommendation to purchase or sell a security, or to provide investment advice. Options involve risk and are not suitable for all investors. Prior to buying or selling an option, a person must receive a copy of Characteristics and Risks of Standardized Options. Copies of this document may be obtained from your broker, from any exchange on which options are traded or by contacting The Options Clearing Corporation, One North Wacker Dr., Suite 500 Chicago, IL 60606 (1-800-678-4667).