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Expiration Date
Options
The expiration date is when an option stops being valid; after it, the right can no longer be exercised.
In the US, standard monthly stock options expire on the third Friday of the month, and weekly and shorter-dated options also exist. Stock options are American-style and can be exercised at any time before expiration, while European-style options such as S&P 500 index options can be exercised only at expiration.
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