Can a stock exchange company actually go bust?
A stock exchange is a marketplace where people can bring their goods [shares] to be traded. There are certain rules. Stock Exchange does not own any shares of the companies that are trading in.  The list of who owns with stock is with the registrar of each company. The electronic shares are held by a Financial Institution [Securities Depository]. So even if the exchange itself goes down, you still hold the same shares as you had before it went down. One would now have to find ways to trade these shares ... possibly via other stock exchange. This leaves the question of inflight transactions, which again would be recorded and available. Think of it similar to eBay. What happens when eBay goes bankrupt? Nothing much, all the seller still have their goods with them. All the buyers who had purchased good before have it when them ... so the question remains on inflight goods where the buyer has paid the seller and not yet received shipments ... Technically, of course. Almost any company can go bankrupt. One small note: a company goes bankrupt, not its stock. Its stock may become worthless in bankruptcy, but a stock disappearing or being delisted doesn't necessarily mean the company went bankrupt. Bankruptcy has implications for a company's debt as well, so it applies to more than just its stock. I don't know of any historical instances where this has happened, but presumably, the warning signs of bankruptcy would be evident enough that a few things could happen.  Another company, e.g. another exchange, holding firm, etc. could buy out the exchange that's facing financial difficulty, and the companies traded on it would transfer to the new company that's formed. If another exchange bought out the struggling exchange, the shares of the latter could transfer to the former. This is an attractive option because exchanges possess a great deal of infrastructure already in place. Depending on the country, this could face regulatory scrutiny however. Other firms or governments could bail out the exchange if no one presented a buyout offer. The likelihood of this occurring depends on several factors, e.g. political will, the government(s) in question, etc. For a smaller exchange, the exchange could close all open positions at a set price. This is exactly what happened with the Hong Kong Mercantile Exchange (HKMex) that MSalters mentioned. When the exchange collapsed in May 2013, it closed all open positions for their price on the Thursday before the shutdown date. I don't know if a stock exchange would simply close all open positions at a set price, since equity technically exists in perpetuity regardless of the shutdown of an exchange, while many derivatives have an expiration date. Furthermore, this might not be a feasible option for a large exchange. For example, the Chicago Mercantile Exchange lists thousands of products and manages hundreds of millions of transactions, so closing all open positions could be a significant undertaking.  If none of the above options were available, I presume companies listed on the exchange would actively move to other, more financially stable exchanges. These companies wouldn't simply go bankrupt. Contracts can always be listed on other exchanges as well. Considering the high level of mergers and acquisitions, both unsuccessful and successful,  in the market for exchanges in recent years, I would assume that option 1 would be the most likely (see the NYSE Euronext/Deutsche Börse merger talks and the NYSE Euronext/ICE merger that's currently in progress), but for smaller exchanges, there is the recent historical precedent of the HKMex that speaks to #3. Also, the above answer really only applies to publicly traded stock exchanges, and not all stock exchanges are publicly-held entities. For example, the Shanghai Stock Exchange is a quasi-governmental organization, so I presume option 2 would apply because it already receives government backing. Its bankruptcy would mean something occurred for the government to withdraw its backing or that it became public, and a discussion of those events occurring in the future is pure speculation.
Typically if the company is so out of whack that it's liquidating, it won't have assets to even cover all its debts never mind enough to return anything back to owners.  If there was any shot of the company continuing as an ongoing concern it would file an 11 and reorganize. "If a company is doing well, it seems less likely to go bankrupt.  If a company is doing poorly, it seems more likely to go bankrupt.  The problem is, where is the inflection point between ""well"" and ""poorly""?  When does a company start to head into oblivion?  Sometimes it is hard to know.  But if you don't call that right and hold onto your shares when a company is tanking, others, who call it before you do, will sell off, devalue the share price, and now you've missed your chance to get out at a good profit.  If you hang on too long, the company may just go bankrupt and you've lost your investment entirely. A healthy profitability of the company therefore has to bolster investor confidence in avoiding this very unpleasant scenario.  Therefore, the more profitable a company is, the more shareholder confidence it inspires, and the more willing to pay for it in the form of increased share price.  And, this then has a ""meta"" effect, in that each shareholder thinks, ""all other investors think this way, too,"" and so each feels good about holding the stock, since he knows he can likely easily liquidate it for good cash if he needs to, either now or in the next year or sometime hence." In the US, and I suspect in most of the developed world, one major point of a corporation is limited liability.  The stockholders are not on the hook for liabilities beyond their investment.  If the company does something terrible, or fails economically, it goes bankrupt.  Usually the stockholders have their investment wiped out, but they are guaranteed that they do not have to pay more in to any settlement. If you've got shares in a company that's filed for U.S. Chapter 11 bankruptcy, that sucks, it really does.  I've been there before and you may lose your entire investment.  If there's still a market for your shares and you can sell them, you may want to just accept the loss and get out with what you can. However, shares of bankrupt companies are often delisted once bankrupt, since the company no longer meets minimum exchange listing requirements.  If you're stuck holding shares with no market, you could lose everything – but that's not always the case: Chapter 11 isn't total and final bankruptcy where the company ceases to exist after liquidation of its assets to pay off its debts.  Rather, Chapter 11 is a section of the U.S. Bankruptcy Code that permits a company to attempt to reorganize (or renegotiate) its debt obligations. During Chapter 11 reorganization, a company can negotiate with its creditors for a better arrangement.  They typically need to demonstrate to creditors that without the burden of the heavy debt, they could achieve profitability.  Such reorganization often involves creditors taking complete or majority ownership of the company when it emerges from Chapter 11 through a debt-for-equity swap. That's why you, as an investor before the bankruptcy, are very likely to get nothing or just pennies on the dollar. Any equity you may be left holding will be considerably diluted in value.  It's rare that shareholders before a Chapter 11 bankruptcy still retain any equity after the company emerges from Chapter 11, but it is possible. But it varies from bankruptcy to bankruptcy and it can be complex as montyloree pointed out. Investopedia has a great article: An Overview of Corporate Bankruptcy.  Here's an excerpt: If a company you've got a stake in   files for bankruptcy, chances are   you'll get back pennies to the dollar.   Different bankruptcy proceedings or   filings generally give some idea as to   whether the average investor will get   back all or a portion of his   investment, but even that is   determined on a case-by-case basis.   There is also a pecking order of   creditors and investors of who get   paid back first, second and last. In   this article, we'll explain what   happens when a public company files   for protection under U.S. bankruptcy   laws and how it affects investors.   [...]   How It Affects Investors   [...]   When your company goes bankrupt, there   is a very good chance you will not get   back the full value of your   investment. In fact, there is a chance   you won't get anything back. [...] Wikipedia has a good article on Chapter 11 bankruptcy at Chapter 11, Title 11, United States Code. Randomly selected stocks would probably become worthless at a similar rate of all businesses going out of business do.  I'm not sure why you'd randomly select a stock though.  Stocks in the S&P500 (or other similar index), or large-cap stocks probably become worthless at a much lower rate. Different stakeholders have different views of 'failure'. Maybe from Air Berlin's point of view it was a failure, but technically speaking it is not really possible to 'fail'. As long as all shares were purchased, which is a virtual guarantee since the investment banks who underwrite the IPO by and large must do to some extent, it will always be 'successful'. A decrease in value of shares immediately after IPO means that the investment bank who did the IPO for Air Berlin didn't match its IPO price with market expectations, causing shorts on the stock, and thus a decline. No failure per se. Yes, but the fact is they probably don't have the cash to pay them right now. I know they just did a cash raise by offering existing shareholders rights to purchase more shares and then additionally issuing new shares. this is always a sign of a weak cash positions, although I'm not quite sure where their cash position is post-rights offering. One of the other issues was the US DOJ fined DB wayyyy more than they should have relative to what they fined US banks for the MBS crisis. Basically US Banks were fined fairly, but DB wasn't because they are foreign and the DOJ likes using foreign companies as piggy-banks...obviously this comes back to hurt the US as now Europeans are more than happy to fine US tech companies up the yin-yang. An eye for an eye... The stock exchange here serves as a meeting place for current shareholders who want to sell their shares to someone else. This has nothing to do with liquidation, which is a transaction between the company and its shareholders. A company does not have to be listed on an exchange to make distributions to shareholders. This would be governed by bankruptcy law... there is no reason a healthy company would take such action. This would be a long drawn process generally amongst debtor the taxes have higher claim, then Sunday debtors (payable), then bank loans... This is followed by loan raised by company deposits then debentures... even among share holders there can be special shares...  More often most shares are equal and the balance is distributed to all. I'm surprised that [Theranos](https://www.vanityfair.com/news/2017/05/theranos-board-response-deposition-court-documents) isn't at or near the top. It went from $9 billion valuation to more or less worthless, all based on technological claims that never lived up to their claims, and with an all-star Board of Advisors. It's pretty much the definition of a hype bubble with an epic collapse. I suppose it's not as immediate a catastrophic failure as some of the ones on the list, but the size of the failure and collapse dwarfs most of them. When you buy shares, you are literally buying a share of the company.  You become a part-owner of it. Companies are not required to pay dividends in any given year.  It's up to them to decide each year how much to pay out. The value of the shares goes up and down depending on how much the markets consider the company is worth.  If the company is successful, the price of the shares goes up.  If it's unsuccessful, the price goes down.  You have no control over that.  If the company fails completely and goes bankrupt, then the shares are worthless. Dilution is where the company decides to sell more shares.  If they are being sold at market value, then you haven't really lost anything.  But if they are sold below cost (perhaps as an incentive to certain staff), then the value of the company per share is now less.  So your shares may be worth a bit less than they were.  You would get to vote at the AGM on such schemes.  But unless you own a significant proportion of the shares in the company, your vote will probably make no difference. In practice, you can't protect yourself.  Buying shares is a gamble.  All you can do is decide what to gamble on. "No one is quite sure what happened (yet).  Speculation includes: The interesting thing is that Procter & Gamble stock got hammered, as did Accenture.  Both of which are fairly stable companies, that didn't make any major announcements, and aren't really connected to the current financial instability in Greece.  So, there is no reason for there stock prices to have gone crazy like that.  This points to some kind of screw up, and not a regular market force. Apparently, the trades involved in this event are going to be canceled. Edit #1: One thing that can contribute to an event like this is automatic selling triggered by stop loss orders.  Say someone at Citi makes a mistake and sells too much of a stock.  That drives the stock price below a certain threshold.  Computers that were pre-programmed to sell at that point start doing their job.  Now the price goes even lower.  More stop-loss orders get triggered.  Things start to snowball.  Since it's all done by computer these days something like this can happen in seconds.  All the humans are left scratching their heads. (No idea if that's what actually happened.) Edit #2: IEEE Spectrum has a pretty concise article on the topic.  It also includes some links to follow. Edit #3 (05/14/2010): Reuters is now reporting that a trader at Waddell & Reed triggered all of this, but not through any wrongdoing. Edit #4 (05/18/2010): Waddell & Reed claims they didn't do it.  The House Financial Services Subcommittee investigated, but they couldn't find a ""smoking gun"".  I think at this point, people have pretty much given up trying to figure out what happened. Edit #5 (07/14/2010): The SEC still has no idea.  I'm giving up. :-)" "What if everyone decided to sell all the shares at a given moment, let's say when the stock is trading at $40? I imagine supply would outweigh demand and the stock would fall. Yes this is the case. Every large ""Sell"" order results in price going down and every large ""Buy"" order results in price going up. Hence typically when large orders are being executed, they are first negotiated outside for a price and then sold at the exchange. I am not talking about Ownership change event. If a company wants a change in ownership, the buyer would be ready to pay a premium over the market price to get controlling stake." I had a coworker whose stock picking skills were clearly in the 1% level. I had a few hundred shares of EMC, bought at $10. When my coworker bought at $80, I quietly sold as it spiked to $100. It then crashed, as did many high tech stocks, and my friend sold his shares close to the $4 bottom advising that the company would go under. So I backed up the truck at $5, which for me, at the time, meant 1000 shares. This was one of nearly 50 trades I made over a good 10 year period. He was loud enough to hear throughout the office, and his trades, whether buy or sell, were 100% wrong.  Individual stocks are very tough, as other posters have offered. That, combined with taking advice from those who probably had no business giving it.  For the record, I am semi-retired. Not from stock picks, but from budgeting 20% of income to savings, and being indexed (S&P) with 90% of the funds.  If there are options on your stock, you might sell calls for a few years, but that's a long term prospect. I'd sell and take my losses. Lesson learned. I hope. As far as I know, there is no direct equivalent. An IRA is subject to many rules.  Not only are there early withdrawal penalties, but the ability to deduct contributions to an IRA phases out with one's income level.  Qualified withdrawals from an IRA won't have penalties, but they will be taxed as income.  Contributions to a Roth IRA can be made post-tax and the resulting gains will be tax free, but they cannot be withdrawn early. Another tax-deductable investment is a 529 plan.  These can be withdrawn from at any time, but there is a penalty if the money is not used for educational purposes. A 401K or similar employer-sponsored fund is made with pre-tax dollars unless it is designated as a Roth 401K.  These plans also require money to be withdrawn specifically for retirement, with a 10% penalty for early withdrawal.  Qualifying withdrawals from a regular retirement plan are taxed as income, those from a Roth plan are not (as with an IRA). Money can be made harder to get at by investing in all of the types of funds you can invest in using an IRA through the same brokers under a different type of account, but the contribution will be made with post-tax, non-deductable dollars and the gains will be taxed.