How can you sell stocks if you do not have any?
Shorting is the term used when someone borrows a stock and sells it at the current price to then buy it back later at hopefully a lower price. There are rules about this as noted in the link that begins this answer as there are risks to selling a stock you don't own of course. If you look up various large companies you may find that there are millions of shares sold short throughout the market as someone does have the shares and they will need to be put back eventually.
"I'll skip the ""authorizing...."" and go right to uses of new shares: Companies need stock as another liquid asset for a variety of purposes, and if not enough stock is available, then may be forced to the open market to acquire, either by exchanging cash or taking on debt to get the cash." "Most of the investors who have large holdings in a particular stock have pretty good exit strategies for those positions to ensure they are getting the best price they can by selling gradually into the volume over time. Putting a single large block of stock up for sale is problematic for one simple reason: Let's say you have 100,000 shares of a stock, and for some reason you decide today is the day to sell them, take your profits, and ride off into the sunset.  So you call your broker (or log into your brokerage account) and put them up for sale.  He puts in an order somewhere, the stock is sold, and your account is credited. Seems simple, right?  Well...not so fast. Professionals - I'm keeping this simple, so please don't beat me up for it! The way stocks are bought and sold is through companies known as ""market makers"".  These are entities which sit between the markets and you (and your broker), and when you want to buy or sell a stock, most of the time the order is ultimately handled somewhere along the line by a market maker.  If you work with a large brokerage firm, sometimes they'll buy or sell your shares out of their own accounts, but that's another story. It is normal for there to be many, sometimes hundreds, of market makers who are all trading in the same equity.  The bigger the stock, the more market makers it attracts.  They all compete with each other for business, and they make their money on the spread between what they buy stock from people selling for and what they can get for it selling it to people who want it. Given that there could be hundreds of market makers on a particular stock (Google, Apple, and Microsoft are good examples of having hundreds of market makers trading in their stocks), it is very competitive.  The way the makers compete is on price.  It might surprise you to know that it is the market makers, not the markets, that decide what a stock will buy or sell for. Each market maker sets their own prices for what they'll pay to buy from sellers for, and what they'll sell it to buyers for.  This is called, respectively, the ""bid"" and the ""ask"" prices.  So, if there are hundreds of market makers then there could be hundreds of different bid and ask prices on the same stock.  The prices you see for stocks are what are called the ""best bid and best ask"" prices.  What that means is, you are being shown the highest ""bid"" price (what you can sell your shares for) and the best ""ask"" price (what you can buy those shares for) because that's what is required.  That being said, there are many other market makers on the same stock whose bid prices are lower and ask prices are higher.  Many times there will be a big clump of market makers all at the same bid/ask, or within fractions of a cent of each other, all competing for business.  Trading computers are taught to seek out the best prices and the fastest trade fills they can. The point to this very simplistic lesson is that the market makers set the prices that shares trade at.  They adjust those prices based (among other factors) on how much buying and selling volume they're seeing.  If they see a wave of sell orders coming into the system then they'll start marking down their bid prices.  This keeps them from paying too much for shares they're going to have to find a buyer for eventually, and it can sometimes slow down the pace of selling as investors and automated systems notice the price decline and decide to wait to sell.  Conversely, if market makers see a wave of buy orders coming into the system, they'll start marking their ask prices up to maximize their gains, since they're selling you shares they bought from someone else, presumably at a lower price.  But they typically adjust their prices up or down before they actually fill trades.  (sneaky, eh?) Depending on how much volume there is on the shares of the company you're selling, and depending on whether there are more buyers than sellers at the moment, your share sell order may be filled at market by a market maker with no real consequence to the share's price. If the block is large enough then it's possible it will not all sell to one market maker, or it might not all happen in one transaction or even all at the same price. This is a pretty complex subject, as you can see, and I've cut a LOT of corners and oversimplified much to keep it comprehensible.  But the short answer to your question is -- it depends. Hope this helps. Good luck!" First, I want to point out that your question contains an assumption. Does anyone make significant money trading low volume stocks?  I'm not sure this is the case - I've never heard of a hedge fund trading in the pink sheets, for example. Second, if your assumption is valid, here are a few ideas how it might work: Accumulate slowly, exit slowly.  This won't work for short-term swings, but if you feel like a low-volume stock will be a longer-term winner, you can accumulate a sizable portion in small enough chunks not to swing the price (and then slowly unwind your position when the price has increased sufficiently). Create additional buyers/sellers.  Your frustration may be one of the reasons low-volume stock is so full of scammers pumping and dumping (read any investing message board to see examples of this).  If you can scare holders of the stock into selling, you can buy significant portions without driving the stock price up.  Similarly, if you can convince people to buy the stock, you can unload without destroying the price.  This is (of course) morally and legally dubious, so I would not recommend this practice. "As @ApplePie pointed out in their answer, at any given time there is a finite amount of stock available in a company. One subtlety you may be missing is that there is always a price associated with an offer to buy shares. That is, you don't put in an order simply to buy 1 share of ABC, you put in an order to buy 1 share of ABC for $10. If no one is willing to sell a share of ABC for $10, then your order will go unfilled. This happens millions of times a day as traders try to figure the cheapest price they can get for a stock. Practically speaking, there is always a price at which people are willing to sell their shares. You can put in a market order for 1 share of ABC, which says essentially ""I want one share of ABC, and I will pay whatever the market deems to be the price"". Your broker will find you 1 share, but you may be very unhappy about the price you have to pay! While it's very rare for a market to have nobody willing to sell at any price, it occasionally happens that no one is willing to buy at any price. This causes a market crash, as in the 2007-2008 financial crisis, when suddenly everyone became very suspicious of how much debt the major banks actually held, and for a few days, very few traders were willing to buy bank stocks at any price." The weird about counting stocks as a form of wealth for their trading value is that he literally can't use that money without losing his company and his source of wealth.  That and Bill Gates transfer of wealth from his publicly owned company into his own privately held entity means there's no way to see how rich Bill G is anymore. He could be making massive amounts of money from that NPO and the only people who would know is the government. For the same reason you wanted it when you bought it. No-one guarantees that you'll be able to sell the stock you hold, and in fact many people get stuck with stocks they'd like to sell, but no-one is buying. But if investors think there's a profit potential that is not exhausted yet - they'll want to buy the stock. Since I'm missing the shortest and simplest answer, I'll add it: A car also doesn't offer dividends, yet it's still worth money. A $100 bill doesn't offer dividends, yet people are willing to offer services, or goods, or other currencies, to own that $100 bill. It's the same with a stock. If other people are willing to buy it off you for a price X, it's worth at least close to price X to you. In theory the price X depends on the value of the assets of the company, including unknown values like expected future profits or losses. Speaking from experience as a trader, in practice it's very often really just price X because others pay price X. "You seem to prefer to trade like I do: ""Buy low, sell high."" But there are some people that prefer a different way: ""Buy high, sell higher."" A stock that has ""just appreciated"" is ""in motion."" That is a ""promise"" (not always kept) that it will continue to go higher. Some people want stocks that not only go higher, but also SOON. The disadvantage of ""buy low, sell high"" is that the stock can stay low for some time. So that's a strategy for patient investors like you and me." why can't I just use the same trick with my own shares to make money on the way    down? Because if you sell shares out of your own portfolio, by definition, you are not selling short at all. If you sell something you own (and deliver it) - then there is no short involved. A short is defined as a net negative position - i.e. you sell shares you do not have. Selling shares you own is selling shares you own - no short involved. You must borrow the shares for a short because in the stock market, you must DELIVER. You can not deliver shares you do not own. The stock market does not work on promises - the person who bought the shares expects ownership of them with all rights that gives them. So you borrow them to deliver them, then return them when you buy them back. Will there be a scenario in which I want to sell, but nobody wants to buy from me and I'm stuck at the brokerage website? Similarly, if nobody wants to sell their stocks, I will not be able to buy at all? Yes, that is entirely possible. With a short position you make your money (profit) when you buy the stocks back to close the position at a lower price than what you bought them at. As short selling is classed as speculation and not investing and you at no time own any actual assets, you cannot donate any short possition to charity. If you did want to avoid paying tax on the profits you could donate the proceeds of the profits after closing the position and thus get a tax deduction equal to the profits you made. But that raises a new and more important question, why are you trading in the first place if you are afraid to make profits in case you have to pay tax on those profits? My interpretation of that sentence is that you can't do the buying/selling of shares outright (sans margin) because of the massive quantity of shares he's talking about.  So you have to use margin to buy the stocks. However, because in order to make significant money with this sort of strategy you probably need to be working dozens of stocks at the same time, you need to be familiar with portfolio margin.  Since your broker does not calculate margin calls based on individual stocks, but rather on the value of your whole portfolio, you should have experience handling margin not just on individual stock movements but also on overall portfolio movements. For example, if 10% (by value) of the stocks you're targeting tend to have a correlation of -0.8 with the price of oil you should probably target another 10% (by value) in stocks that tend to have a correlation of +0.8 with the price of oil.  And so on and so forth.  That way your portfolio can weather big (or even small) changes in market conditions that would cause a margin call on a novice investor's portfolio. Investments earn income relative to the principal amounts invested. If you do not have much to invest, then the only way to 'get rich' by investing is to take gambles. And those gambles are more likely to fail than succeed. The simplest way for someone without a high amount of 'capital' [funds available to invest] to build wealth, is to work more, and invest in yourself. Go to school, but only for proven career paths. Take self-study courses. Learn and expand your career opportunities.  Only once you are stable financially, have minimal debt [or, understand and respect the debt you plan to pay down slowly, which some people choose to do with school and house debt], and are able to begin contributing regularly to investment plans, can you put your financial focus on investing. Until then, any investment gains would pale in comparison to gains from building your career. The problem with short would be that even if the stock eventually falls, it might raise a lot in the meantime, and unless you have enough collateral, you may not survive till it happens.  To sell shares short, you first need to borrow them (as naked short is currently prohibited in US, as far as I know). Now, to borrow you need some collateral, which is supposed to be worth more that the asset you are borrowing, and usually substantially more, otherwise the risk for the creditor is too high. Suppose you borrowed 10K worth of shares, and gave 15K collateral (numbers are totally imaginary of course). Suppose the shares rose so that total cost is now 14K. At this moment, you will probably be demanded to either raise more collateral or close the position if you can not, thus generating you a 4K loss. Little use it would be to you if next day it fell to 1K - you already lost your money!  As Keynes once said, Markets can remain irrational longer than you can remain solvent. See also another answer which enumerates other issues with short selling. As noted by @MichaelPryor, options may be a safer way to do it. Or a short ETF like PSQ - lists of those are easy to find online. If this is your money, and if you can - if asked - prove that you legally made it, there is no limit. You pay taxes on your income, so sending it into the world is tax free. Your citizenship is not relevant for that.