When you own an option, you have two choices: exercise it or sell it. The decision hinges on whether you want to convert the option into the underlying stock or capture its market value. When you exercise an option, you convert it into the underlying stock (for calls, you buy; for puts, you sell), but you forfeit any remaining extrinsic value — the “time value” and volatility premium built into the option’s price. By contrast, if you sell the option (close your position), you capture both its intrinsic value (the in-the-money amount) and its extrinsic value (what someone else is willing to pay for the time and volatility left until expiration).
Example: Suppose you own a call option on Apple (AAPL) with a $150 strike, expiring in a month, and the stock trades at $160. The option trades at $13:
If you exercise: You get $10 per share (the in-the-money amount), but lose the $3 extrinsic value. If you sell: You get the full $13 per share—maximizing your return.
Unless you specifically want to own the stock (e.g., for dividends or long-term holding), selling the option is almost always superior to exercising early. This is especially true for American-style options before expiration, as you preserve the full market value—including extrinsic value. The only rational reason to exercise early is to capture a dividend (for calls) or if the extrinsic value is negligible (e.g., right before expiration and deep in the money).