Put option

A put option gives the buyer the right, but not the obligation, to sell an underlying security at a specific price for a specified time. The seller of a put option has the obligation to buy the underlying security should the buyer choose to exercise his option to sell.
The buyer of a put option has purchased the right to sell 100 shares of the underlying stock at the contracted exercise price. Thus, the buyer of one QQQ April 25 put has the right to sell 100 shares of QQQ at $25 any time prior to the expiration date. In order to exercise the option and sell the underlying at the agreed upon exercise price, the buyer must file a proper exercise notice with the OCC through a broker before the date of expiration. All puts covering QQQ stock are referred to as an "option class." Each individual option with a distinctive trading month and strike price is an "option series."

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