Financial Dictionary
Underlying
1. In derivatives, the security that must be delivered when a derivative contract, such as a put or call option, is exercised.
2. In equities, the common stock that must be delivered when a warrant is exercised, or when a convertible bond or convertible preferred share is converted to common stock.
Investopedia Commentary
The price of the underlying is the main factor that determines prices of derivative securities, warrants and convertibles. Thus, a change in an underlying results in a simultaneous change in the price of the derivative asset that is linked to it. In most cases, the underlying is a security such as a stock (in the case of options) or a commodity (in the case of futures).
Related Links
Futures Fundamentals
What Are Warrants?
Convertible Bonds: An Introduction
Options Basics Tutorial
See also: Call Option, Conversion Price, Convertible Bond, Convertible Preferred Stock, Derivative, In the Money, Option, Put Option, Strike Price, Warrant