A buyer’s risks are limited to the premium cost; depending on how many points a stock moves up, a call seller’s losses can be much higher.
When you take a short position in a call, the decision to exercise belongs to the buyer. You need to be able and willing to deliver 100 shares in the event that the call is exercised, no matter how high current market value has gone. If you do not already own 100 shares, you will be required upon exercise to buy 100 shares at current market value and deliver them at the striking price of the call. The difference in these prices could be significant.




