Consequences of not closing an open short sell position?
You would generally have to pay interest for everyday you hold the position overnight.  If you never close the position and the stock price goes to zero, you will be closed out and credited with your profit. If you never close the position and the stock price keeps going up and up, your potential loss is an unlimited amount of money.  Of course your broker may close you out early for a number of reasons, particularly if your loss goes above the amount of capital you have in your trading account. 2 things may happen. Either your positions are closed by the broker and the loss or profit is credited to your account. Else it is carried over to the next day and you pay interest on the stocks lent to you. What happens will be decided by the agreement signed between you and your broker.
Closing a credit card decreases your total available balance, which can have a small negative effect if that credit card is a significant portion of your available credit.  If it is not, then it likely will have little impact on your credit in that department. However, the case you explained - get a card, use it for a short while, then dump it - won't have much long-term impact to your available credit, since you will end up with the same amount as you started. The second factor will be the average age of accounts.  This will affect you both in the short and long term, if you've had accounts open for a fairly long time, but won't impact you much if your credit history is fairly short.  Even closed accounts affect the Average Age of Accounts for FICO scores (but not for some other scoring methods such as VantageScore).  If you have only one other account, and it was 10 years old, then opening and closing this decreases your average age of accounts from 10 to 5 years - a significant hit which will not go away for years (10+ years in some cases, though usually 7 years).  This will lower your score some.  If you have had a lot of accounts, though (including things like mortgage, student loan, etc.), this won't have as significant of an impact, and if you had a short history in the first place, it won't hurt you much either. The third factor will be the hard credit pull.  That will have a small negative impact for around six months; so don't do this just before getting a mortgage, but mostly this won't be a significant impactor for you. The original poster's concern is valid.  Sometimes, market orders do get executed at seemingly ridiculous prices. In addition to Victor's reasons for using a market order, sometimes a seller does not care how low the price is.  For example, after a company goes broke, its stock continues to trade for a while.  This allows shareholders to realize their losses for tax purposes, and allows short-sellers to close out their positions.  A shareholder who is trying to realize a 10 dollar per share loss for tax purposes probably does not care whether he gets 10 cents per share or 0.001 cents per share, so a sell-at-market order makes sense. "It is possible and it depends on your strategy. As short selling interest rates are annual and levied monthly at a prorated rate. Interest rates are also low in general, with the exception of hard to borrow stocks. Therefore you can maintain a short position for weeks on end and notice nothing. Months even, if the position itself has already gained in your favor. There is no additional fee for opening the short position. Although some brokers have a ""locate"" fee, if it is hard to borrow the stock and they need to go find some shares to short. So you can do it as much as you like." It's actually quite simple. You're actually confusing two concept. Which are taking a short position and short selling itself. Basically when taking a short position is by believing that the stock is going to drop and you sell it. You can or not buy it back later depending on the believe it grows again or not. So basically you didn't make any profit with the drop in the price's value but you didn't lose money either.  Ok but what if you believe the market or specific company is going to drop and you want to profit on it while it's dropping. You can't do this by buying stock because you would be going long right? So back to the basics. To obtain any type of profit I need to buy low and sell high, right? This is natural for use in long positions. Well, now knowing that you can sell high at the current moment and buy low in the future what do you do? You can't sell what you don't have. So acquire it. Ask someone to lend it to you for some time and sell it. So selling high, check.  Now buying low? You promised the person you would return him his stock, as it's intangible he won't even notice it's a different unit, so you buy low and return the lender his stock. Thus you bought low and sold high, meaning having a profit. So technically short selling is a type of short position. If you have multiple portfolios and lend yourself (i.e. maintaining a long-term long position while making some money with a short term short-term strategy) you're actually short selling with your own stock. This happens often in hedge funds where multiple strategies are used and to optimise the transaction costs and borrowing fees, they have algorithms that clear (match) long and short coming in from different traders, algorithms, etc. Keep in mind that you while have a opportunities risk associated.  So basically, yes, you need to always 'borrow' a product to be able to short sell it. What can happen is that you lend yourself but this only makes sense if: "I'll answer this question: ""Why do intraday traders close their position at then end of day while most gains can be done overnight (buy just before the market close and sell just after it opens). Is this observation true for other companies or is it specific to apple ?"" Intraday traders often trade shares of a company using intraday leverage provided by their firm. For every $5000 dollars they actually have, they may be trading with $100,000, 20:1 leverage as an example. Since a stock can also decrease in value, substantially, while the markets are closed, intraday traders are not allowed to keep their highly leveraged positions opened. Probabilities fail in a random walk scenario, and only one failure can bankrupt you and the firm." "You are likely making an assumption that the ""Short call"" part of the article you refer to isn't making: that you own the underlying stock in the first place. Rather, selling short a call has two primary cases with considerably different risk profiles. When you short-sell (or ""write"") a call option on a stock, your position can either be: covered, which means you already own the underlying stock and will simply need to deliver it if you are assigned, or else uncovered (or naked), which means you do not own the underlying stock. Writing a covered call can be a relatively conservative trade, while writing a naked call (if your broker were to permit such) can be extremely risky. Consider: With an uncovered position, should you be assigned you will be required to buy the underlying at the prevailing price. This is a very real cost — certainly not an opportunity cost. Look a little further in the article you linked, to the Option strategies section, and you will see the covered call mentioned there. That's the kind of trade you describe in your example." Depending on the structure of you're portfolio, it could be that your portfolio is delta neutral to take advantage of diminishing time value on options, short straddles/strangles would be an example. "For personal investing, and speculative/ highly risky securities (""wasting assets"", which is exactly what options are), it is better to think in terms of sunk costs. Don't chase this trade, trying to make your money back. You should minimize your loss. Unwind the position now, while there is still some remaining value in those call options, and take a short-term loss. Or, you could try this.  Let's say you own an exchange traded call option on a listed stock (very general case). I don't know how much time remains before the option's expiration date. Be that as it may, I could suggest this to effect a ""recovery"".  You'll be long the call and short the stock. This is called a delta hedge, as you would be delta trading the stock. Delta refers to short-term price volatility.  In other words, you'll short a single large block of the stock, then buy shares, in small increments, whenever the market drops slightly, on an intra-day basis. When the market price of the stock rises incrementally, you'll sell a few shares. Back and forth, in response to short-term market price moves, while maintaining a static ""hedge ratio"". As your original call option gets closer to maturity, roll it over into the next available contract, either one-month, or preferably three-month, time to expiration. If you don't want to, or can't, borrow the underlying stock to short, you could do a synthetic short. A synthetic short is a combination of a long put and a short call, whose pay-off replicates the short stock payoff.  I personally would never purchase an unhedged option or warrant. But since that is what you own right now, you have two choices: Get out, or dig in deeper, with the realization that you are doing a lot of work just to trade your way back to a net zero P&L.  *While you can make a profit using this sort of strategy, I'm not certain if that is within the scope of the money.stachexchange.com website."