Option buyers pay a price for the right to buy or sell the underlying security. This price is called the option premium. The premium is paid to the writer, or seller, of the option. In return, the writer of a call option is obligated to deliver the underlying security (in return for the strike price per share) to an option buyer if the call is exercised and, likewise, the writer of a put option is obligated to take delivery of the underlying security (at a cost of the strike price per share) from an option buyer if the put is exercised. Whether or not an option.