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Option Contract
An option contract defines the specific terms of an options position, including the underlying asset, option type, strike price and expiration. For standard US equity options, one contract generally represents 100 shares of the underlying stock, although contract specifications can differ.
Why it matters to you
Buying "an Amazon call" is not enough information to identify the position. You need to know which contract: AMZN call $260 strike January expiration Those details determine what you actually own.