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Option (finance)
In finance, an option is a contract which gives the ''buyer'' (the owner or holder) the right, but not the obligation, to buy or sell an underlying asset or instrument at a specified strike price on or before a specified date, depending on the form of the option. The strike price may be set by reference to the spot price (market price) of the underlying security or commodity on the day an option is taken out, or it may be fixed at a discount or at a premium. The ''seller'' has the corresponding obligation to fulfill the transaction – that is to sell or buy – if the buyer (owner) "exercises" the option. An option that conveys to the owner the right to ''buy'' something at a specific price is referred to as a call; an option that conveys the right of the owner to ''sell'' something at a specific price is referred to as a put. Both are commonly traded, but for clarity, the call option is more frequently discussed.
The seller may grant an option to a buyer as part of another transaction, such as a share issue or as part of an employee incentive scheme, otherwise a buyer would pay a premium to the seller for the option. A call option would normally be exercised only when the strike price is below the market value of the underlaying asset at that time, while a put option would normally be exercised only when the strike price is above the market value. When an option is exercised, the cost to the buyer of the asset acquired is the strike price plus the premium, if any. When the option expiration date passes without the option being exercised, then the option expires and the buyer would forfeit the premium to the seller. In any case, the premium is income to the seller, and normally a capital loss to the buyer.
The owner of an option may on-sell the option to a third party in a secondary market, in either an over-the-counter transaction or on an options exchange, depending on the type of option and its terms. The market price of an American-style option normally closely follows that of the underlying stock; it being the difference between the market price of the stock and the strike price of the option. The actual market price of the option may vary to some degree depending on a number of factors, such as a significant option holder may need to sell the option as the expiry date is approaching and he does not have the financial resources to exercise the option, or a buyer in the market is trying to amass a large option holding. The ownership of an option does not generally entitle the holder to any rights associated with the underlying asset, such as voting rights or to receive any income from the underlying asset, such as a dividend.
==History==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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