Underlying security

Definition:

For options, the security that is subject to purchase or sold upon exercise of an option contract. For example, IBM stock is the underlying security for IBM options. For Depository receipts, the class, series, and number of the foreign shares represented by the depository receipt.

Investing Essentials


Copyright © 2011 Campbell R. Harvey, Professor of Finance, Fuqua School of Business at Duke University

Term of the Day

Irrational call option

The implied call imbedded in a MBS. Irrational because the call is sometimes not exercised when it is in the money (interest rates are below the threshold to refinance), and sometimes exercised when... Read More

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