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Can the purchaser of a stock call option cancel the contract?
You bought the right – but not the obligation – to buy a certain number of shares at $15 from  whomsoever sold you the option, and you paid a premium for it.  You can choose whether you want to buy the shares at $15 during the period agreed upon. If you call for the shares, the other guy has to sell the shares to you for $15 each, even if the market price is higher. You can then turn around and promptly resell the purchased shares at the higher market price. If the market price never rises above $15 at any time while the option is open, you still have the right to buy the shares for $15 if you choose to do so. Most rational people would let the option expire without exercising it, but this is not a legal requirement.  Doing things like buying shares at $15 when the market price is below $15 is perfectly legal; just not very savvy.  You cannot cancel the option in the sense of going to the seller of the option and demanding your premium money back because you don't  intend to exercise the option because the market price is below $15.  Of course, if the market price is above $15 and you tell the seller to cancel the contract, they will be happy to do so, since it lets them off the hook. They may or may not give you the premium back in this case.