Investopedia explains 'Early Exercise'
While early exercise is generally not advisable, because the time value inherent in the option premium is lost upon doing so, there are certain circumstances under which early exercise may be advantageous. For example, an investor may choose to exercise a call option that is deeply in-the-money (such an option will have negligible time value) just before the ex-dividend date of the underlying stock. This will enable the investor to capture the dividend paid by the underlying stock, which should more than offset the marginal time value lost due to early exercise.
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