Strike Price
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The strike price (or exercise price) is the fixed price at which the holder of an option can buy (in the case of a call) or sell (in the case of a put) the underlying security. It is set when the contract is originated and does not change over the option's life.
Standardized US equity options trade at strike intervals of $1, $2.50, $5 or $10 depending on the underlying's price level.