Remember that call options are contracts that give the person holding the contract the right to buy at an agreed upon price, called the “strike price”.
Now for the person buying the call option, they expect the stock to go up. In our example here, let’s say that the current stock price of XYZ when the call option is bought is $50, and the agreed upon strike price is $55. Of course the person who bought the call option would theoretically exercise this contract if the price goes higher than $55 (since the lowest amount they can pay for a stock is $55, or the strike price). Remember though, they did pay a premium (which let’s say in our example is $4 per share, and a single call contract has 100 shares). Therefore the person who bought the call would ideally want the stock price to hit $59 to break even, and therefore would probably exercise at $59.
For the person who sold the call option contract, there are usually two ways in which he would do that. One is either naked, or covered.
Selling a call option naked, the person does not own the stock, and the hope the stock price will go down. Therefore the only profit to be made is through the premium (in the example above that would be $500. For the graph below, that would be $200). As the stock price increases in value, so does how much there person will need to pay to acquire the stock they don’t have (so if the option is exercised, then they would lose: [(current stock price – strike price)] * 100 – premium. The fact is the current stock price could go to infinity!
Now what should you do as a seller of a naked call option. There are 4 alternatives. If the stock price is below the strike price (called “out of the money”, which is counter intuitive since this term is more for the buyer of the call), then you can: (a) wait for the contract to expire ( online it doesn’t seem like people do this), or (b) buy back the call option at a cheaper price. If you are in the money (so the stock price is above the strike price, and there is likelihood the call option buyer would execute), then you can: (a) buy the contract back for a higher price, (b) buy the underlying stock itself at the current stock price so you get protected as the price goes up, or (c) wait till it get executed, then buy the stock (which is not the usual course of action since the stock price could go higher).
(in the example below, the premium is $2 per share, the strike price is $105, and the $107 listed is because of the premium + the strike price).
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(https://www.investopedia.com/articles/optioninvestor/122701.asp)
Selling a call option covered (aka covered calls), unlike selling a naked call, the person also wants the stock price to go up because the fact is, they already own the stock. Continuing from the example at the top of this post where the call option contract was sold when the stock price is $50, and the strike price is $55, and the premium is $4 per share, then as the call option seller, it it makes sense that you make money from premium, plus if the stock price goes up to the strike price of $55 (and therefore could get executed), then you also make $5 per share. (realistically the call option buyer would not execute until the stock price is at $59 so they can also get back what they paid in their premiums… but the seller would ever only see $55 as that is the strike price).
The “substantial lost” part of the graph below is there since you do have to hold onto your stock until the option contract is executed or expires. During that time the stock price could go to $0. If you end up selling your stock during the contract, that would put you in a naked position, which then the naked covered calls section above applies).
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https://www.investopedia.com/articles/optioninvestor/08/covered-call.asp