With no dividends involved, with optimal strategy, only puts have the possibility of being desirable to exercise early.
If the stock pays a dividend, then it is sometimes optimal to exercise a call early too.
Excluding those situations, its usally better for the long to trade out instead of exercise early. Naturally as you approach expiration, the chances increase as the time value drops.
Finally, I dont think you can always be 100% certain that the guy on the other end knows "optimal strategy", so there is always a little risk there.
Just my opinion.
-Tony
If the stock pays a dividend, then it is sometimes optimal to exercise a call early too.
Excluding those situations, its usally better for the long to trade out instead of exercise early. Naturally as you approach expiration, the chances increase as the time value drops.
Finally, I dont think you can always be 100% certain that the guy on the other end knows "optimal strategy", so there is always a little risk there.
Just my opinion.
-Tony