What would the broker do about this naked call option?
The broker would give you a margin call and get you to deposit more funds into your account. They wouldn't wait for the stock price to reach $30, but would take this action much earlier. More over it is very unrealistic for any stock to go up 275% over a few hours, and if the stock was this volatile the broker would be asking for a higher margin to start with. What I am really worried about is that if there were any situation like this you are not considering what you would do as part of your risk management strategy. Before writing the option you should already have an exit point at which you would buy back the option to limit your losses. If the underlying is currently moving as aggressively as stated, the broker would immediately forcibly close positions to maintain margin.  What securities are in fact closed depends upon the internal algorithms. If the equity in the account remains negative after closing all positions if necessary, the owner of the account shall owe the broker the balance.  The broker will close the account and commence collections if the owner of the account does not pay the balance quickly. Sometimes, brokers will impose higher margin requirements than mandated to prevent the above eventuality. Brokers frequently close positions that violate internal or external margin requirements as soon as they are breached. Yes, it can buy back the call, but much before stock hits the $30 mark.   Let us say you got 1$ from selling the call. So the total money in your account is 4$ + 1 $ = 5 $. When stock hits 10$ (your strike), the maintenance margin is 5$. As soon as stock goes past 10, your maintenance margin is violated. So broker will buy back your call (at least IB does that, it does not wait for a margin call). Now if the stock gapped up from 8 to 30,then yes, broker will buy it back at 30, so your account will have a negative balance. Assume the call cost 20$ when stock hit 30, your balance is: 5 - (30-10) = -15. Depending on broker, I suppose they will ask you to bring your account balance back up to positive. If they don't do that, they risk going out of business.
There are 2 main types of brokers, full service and online (or discount). Basically the full service can provide you with advice in the form of recommendations on what to buy and sell and when, you call them up when you want to put an order in and the commissions are usually higher. Whilst an online broker usually doesn't provide advice (unless you ask for it at a specified fee), you place your orders online through the brokers website or trading platform and the commissions are usually much lower. The best thing to do when starting off is to go to your country's stock exchange, for example, The ASX in Sydney Australia, and they should have a list of available brokers. Some of the online brokers may have a practice or simulation account you can practice on, and they usually provide good educational material to help you get started. If you went with an online broker and wanted to buy Facebook on the secondary market (that is on the stock exchange after the IPO closes), you would log onto your brokers website or platform and go to the orders section. You would place a new order to buy say 100 Facebook shares at a certain price. You can use a market order, meaning the order will be immediately executed at the current market price and you will own the shares, or a limit price order where you select a price below the current market price and wait for the price to come down and hit your limit price before your order is executed and you get your shares. There are other types of orders available with different brokers which you will learn about when you log onto their website. You also need to be careful that you have the funds available to pay for the share at settlement, which is 3 business days after your order was executed. Some brokers may require you to have the funds deposited into an account which is linked to your trading account with them. To sell your shares you do the same thing, except this time you choose a sell order instead of a buy order. It becomes quite simple once you have done it a couple of times. The best thing is to do some research and get started. Good Luck. "EDIT quid keenly identified the 1:7 reverse split In May 2017.  In a 1:7 reverse split, your shares are worth 7 times as much per share but you have 1/7 the amount of shares.  A share worth $3.78 now was worth (all else being equal) $0.54 a month ago.   So a call with a $2.50 strike a month ago was well out-of-the-money, and would now be the equivalent of a call with a $17.50 strike.  A $17.50 call with a $3.78 underlying (or a $2.50 call with a $0.54 underlying) would reasonably be worth only 5 cents. So I now suspect that the quote is a stale quote that existed pre-split and hasn't been adjusted by the provider. OLD ANSWER I can find no valid reason why those calls would be so cheap.  The stock price has been trending down from its onset in 2000, so either no one expects it to be above $2.50 in a month or it's so illiquid that there's not any real data to evaluate the options.  They did pay some massive (30%) dividends in 2010 and 2012, they've been hemorrhaging cash for the past 4 years at least, and I have found at least on ""strong sell"" rating, so there's not much to be optimistic about.  NASDAQ does not list any options for the stock, so it must be an OTC trade.   With an ask size of 10 you could buy calls on 1,000 shares for $0.05, so if you can afford to lose $50 and want to take a flyer you can give it a shot, but I suspect it's not a valid quote and is something that's been manufactured by the option broker." It depends on the broker, each one's rules may vary. Your broker should be able to answer this question for how they handle such a situation. The broker I used would execute and immediately sell the stock if the option was 25 cents in the money at expiration. If they simply executed and news broke over the weekend (option expiration is always on Friday), the client could wake up Monday to a bad margin call, or worse. "The question is, how do I exit? I can't really sell the puts because there isn't   enough open interest in them now that they are so far out of the money. I have about $150K of funds outside of this position that I could use, but I'm   confused by the rules of exercising a put. Do I have to start shorting the stock? You certainly don't want to give your broker any instructions to short the stock! Shorting the stock at this point would actually be increasing your bet that the stock is going to go down more. Worse, a short position in the stock also puts you in a situation of unlimited risk on the stock's upside – a risk you avoided in the first place by using puts. The puts limited your potential loss to only your cost for the options. There is a scenario where a short position could come into play indirectly, if you aren't careful.  If your broker were to permit you to exercise your puts without you having first bought enough underlying shares, then yes, you would end up with a short position in the stock. I say ""permit you"" because most brokers don't allow clients to take on short positions unless they've applied and been approved for short positions in their account. In any case, since you are interested in closing out your position and taking your profit, exercising only and thus ending up with a resulting open short position in the underlying is not the right approach. It's not really a correct intermediate step, either. Rather, you have two typical ways out: Sell the puts.  @quantycuenta has pointed out in his answer that you should be able to sell for no less than the intrinsic value, although you may be leaving a small amount of time value on the table if you aren't careful.  My suggestion is to consider using limit orders and test various prices approaching the intrinsic value of the put.  Don't use market orders where you'll take any price offered, or you might be sorry. If you have multiple put contracts, you don't need to sell them all at once. With the kind of profit you're talking about, don't sweat paying a few extra transactions worth of commission. Exercise the puts.  Remember that at the other end of your long put position is one (or more) trader who wrote (created) the put contract in the first place. This trader is obligated to buy your stock from you at the contract price should you choose to exercise your option.  But, in order for you to fulfill your end of the contract when you choose to exercise, you're obligated to deliver the underlying shares in exchange for receiving the option strike price. So, you would first need to buy underlying shares sufficient to exercise at least one of the contracts.  Again, you don't need to do this all at once.  @PeterGum's answer has described an approach. (Note that you'll lose any remaining time value in the option if you choose to exercise.) Finally, I'll suggest that you ought to discuss the timing and apportioning of closing out your position with a qualified tax professional. There are tax implications and, being near the end of the year, there may be an opportunity* to shift some/all of the income into the following tax year to minimize and defer tax due. * Be careful if your options are near expiry!  Options typically expire on the 3rd Friday of the month." At the higher level - yes. The value of an OTM (out of the money) option is pure time value. It's certainly possible that when the stock price gets close to that strike, the value of that option may very well offer you a chance to sell at a profit. Look at any OTM strike bid/ask and see if you can find the contract low for that option. Most will show that there was an opportunity to buy it lower at some point in the past.  Your trade. Ask is meaningless when you own an option. A thinly traded one can be bid $0 /ask $0.50. What is the bid on yours? On expiry, with the underlying share price at $46, we have : You ask :  How come they substract 600-100. Why ? Because you have sold the $45 call to open you position, you must now buy it back to close your position.  This will cost you $100, so you are debited for $100 and this debit is being represented as a negative (subtracted); i.e., -$100 Because you have purchased the $40 call to open your position, you must now sell it to close your position.  Upon selling this option you will receive $600, so you are credited with $600 and this credit is represented as a positive (added) ; i.e., +$600. Therefore, upon settlement, closing your position will get you $600-$100 = $500.  This is the first point you are questioning.   (However, you should also note that this is the value of the spread at settlement and it does not include the costs of opening the spread position, which are given as $200, so you net profit is $500-$200 = $300.) You then comment :  I know I am selling 45 Call that means : As a writer: I want stock price to go down or stay at strike. As a buyer: I want stock price to go up. Here, note that for every penny that the underlying share price rises above $45, the money you will pay to buy back your short $45 call option will be offset by the money you will receive by selling the long $40 call option.  Your $40 call option is covering the losses on your short $45 call option. No matter how high the underlying price settles above $45, you will receive the same $500 net credit on settlement.  For example, if the underlying price settles at $50, then you will receive a credit of $1000 for selling your $40 call, but you will incur a debit of $500 against for buying back your short $45 call.  The net being $500 = $1000-$500.  This point is made in response to your comments posted under Dr. Jones answer. "What you did is called a ""strangle."" It's rather unlikely that both will be exercised on the same day. But yes, it can happen.  That is if the market is very volatile on a given day, so that the stock hits 13 in the morning, the put gets exercised, and then hits 15 later in the day, so the call gets exercised. Or vice versa. More to the point, the prices are close enough that one might be hit on one day, and the other on a DIFFERENT day. In either case, if one side gets hit, you need to reevaluate your position in the other. But basically, any open position you have can be hit at any time. The only way to avoid this risk is not to have positions." I sell a put for a strike price at the market. The stock rises $50 over the next couple months. I've gotten the premium, but lost the rest of the potential gain, yet had the downside risk the whole time.  There's no free lunch.  Edit - you can use a BS (Black-Scholes) calculator to create your own back testing. The calculator shows a 1% interest rate, 2% yield, and 15% volatility produce a put price almost identical to the pricing I see for S&P (the SPY ETF, specifically) $205 put. No answer here, including mine, gave any reference to a study. If one exists, it will almost certainly be on an index, not individual stocks. Note that Jack's answer referencing PUTX does exactly that. The SPY ETF and it put options. My suggestion here would, in theory, let you analyze this strategy for individual stock options as well.  For SPY - With SPY at 204.40, this is the Put you'd look at -  12 times the premium is $33.36 or 16% the current price. The next part of the exercise is to see how the monthly ups and downs impact this return. A drop to $201 wipes out that month's premium.  It happens that it now March 18th, and despite a bad start to the year, we are at break-even YTD. A peek back shows In Dec you picked up $2.87 premium, (1.4% the current price then) but in Jan, it closed for a loss of $12. Ouch. Now, if you started in January, you'd have picked up 2 month's premiums and today or Monday sell the 3rd. You'd have 2.8% profit so far, vs the S&P break even.  Last, for now, when selling a naked put, you have to put up margin money. Not sure how much, but I use percent of the value of underlying stock to calculate returns. That choice is debatable, it just keeps percents clean. Else you put up no money and have infinite return.