Strike price

In finance, the 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 call), or sell (in the case of a put), the 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.

For example, an IBM may call a strike price of $50 a share. When the option is exercised, the owner of the option will buy 100 shares of IBM stock for $50 per share.

Moneyness

Moneyness is the value of a financial contract if the contract settlement is financial. 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-money, at-the-money and out-of-the-money describe the moneyness of options.

A call option is in-the-money if the strike price is below the market price of the underlying stock.
- A put option is in-the-money if the strike price is above the market price of the underlying stock.
A call or put option is at-the-money if the stock price and the exercise price are the same (or close).
A call option is out-of-the-money if the strike price is above the market price of the underlying stock.
- A put option is out-of-the-money if the strike price is below the market price of the underlying stock.

Mathematical formula

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

\max\left[(S-K);0\right]

also written as

(S-K)^{+} \

where

(x)^+ =\{^{x\ \ x\geq0}_{0\ \ x<0}

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:

\max\left[(K-S);0\right]

(K-S)^{+} \

For a digital option payoff is $1_{S\geq K}$ , where $1_{\{\}}$ is the indicator function.

References

McMillan, Lawrence G. (2002). Options as a Strategic Investment (4th ed.). New York : New York Institute of Finance. ISBN 0-7352-0197-8.

Derivatives market

Derivative (finance)

Options

Terms	Credit spread Debit spread Exercise Expiration Moneyness Open interest Pin risk Risk-free interest rate Strike price the Greeks Volatility
Vanilla options	Bond option Call Employee stock option Fixed income FX Option styles Put Warrants
Exotic options	Asian Barrier Basket Binary Chooser Cliquet Commodore Compound Forward start Interest rate Lookback Mountain range Rainbow Swaption
Combinations	Collar Covered call Fence Iron butterfly Iron condor Straddle Strangle Protective put Risk reversal
Spreads	Back Bear Box Bull Butterfly Calendar Diagonal Intermarket Ratio Vertical
Valuation	Binomial Black Black–Scholes model Finite difference Garman-Kohlhagen Margrabe's formula Put–call parity Simulation Real options valuation Trinomial Vanna–Volga pricing

Swaps

Exotic derivatives

Other derivatives

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Strike price

Moneyness

Mathematical formula

See also

References