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Beginning options traders often make costly mistakes due to either a lack of knowledge or misinformation about the basic characteristics of options and their exercise. Examples of common errors include being surprised that one is unable to close an index option position on the Friday before expiration, or being surprised by an unhedged option exercise during expiration. This paper covers some of the basic concepts surrounding option expiration and how options are exercised. Be sure you understand the settlement, exercise, and expiration characteristics of the options you trade.