In financethe strike price or exercise price of an option is the fixed price at which the owner of the option can buy in the case of a callor sell in the case of a putthe underlying security or commodity. 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 strike price is a key variable in a derivatives contract between two parties. Where the contract requires delivery of the underlying instrument, the trade will be at the strike price, regardless of the market price of the underlying instrument at that time. Moneyness is the value of a financial contract if the contract settlement is financial.

Strike price - Wikipedia

More specifically, it is the difference between the strike price of the option and the current trading price of its underlying security. In options trading, terms such as in-the-moneyat-the-money and out-of-the-money describe the moneyness of options.

A call option has positive monetary value at expiration when the underlying has a spot price S above the strike price K. Since the option will not be exercised unless it is in-the-money, the payoff for a call option is.

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A put option has positive monetary value at expiration when the underlying has a spot price below the strike price; it is " out-the-money " otherwise, and will not be exercised. The payoff is therefore:.

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Employee Equity: The Option Strike Price – AVC

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