The answer depends upon the option type and its region of listing. There are no commissions associated with an exercise or assignment of US stock and index security options and out-of-the-money non-US index options. A commission is charged for an exercise or assignment of an in-the-money non-US index option and for options on futures. Please refer to the Other Fees section for details.
Are there commissions associated with option exercise or assignment?
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How do I know if an option has been assigned?
What happens at expiration if my long put option is in-the-money?
What happens at expiration if my long call option is in-the-money?
What happens at expiration if my option is out-of-the-money?