Are the sellers selling pre-IPO shares over these websites legitimate or fake?
"I think you're right that these sites look so unprofessional that they aren't likely to be legitimate. However, even a very legitimate-looking site might be a fake designed to separate you from your money.  There is an entire underground industry devoted to this kind of fakery and some of them are adept at what they do.  So how can you tell? One place that you can consult is FINRA's BrokerCheck online service.  This might be the first of many checks you should undertake. Who is FINRA, you might ask?  ""The Financial Industry Regulatory Authority (FINRA) is the largest independent regulator for all securities firms doing business in the United States."" See here. My unprofessional guess is, even if a firm's line of business is to broker deals in private company shares, that if they're located in the U.S. or else dealing in U.S. securities then they'd still need to be registered with FINRA – note the ""all securities firms"" above. I was able to search BrokerCheck and find SecondMarket (the firm @duffbeer703 mentioned) listed as ""Active"" in the FINRA database. The entry also provides some information about the firm.  For instance, SecondMarket appears to also be registered with the S.E.C.. You should also note that SecondMarket links back to these authorities (refer to the footer of their site): ""Member FINRA | MSRB | SIPC.  Registered with the SEC as an alternative trading system for trading in private company shares.  SEC 606 Info [...]"" Any legitimate broker would want you to look them up with the authorities if you're unsure about their legitimacy. However, to undertake any such kind of deal, I'd still suggest more due diligence.  An accredited investor with serious money to invest ought to, if they are not already experts themselves on these things, hire a professional who is expert to provide counsel, help navigate the system, and avoid the frauds." You cannot trade in pre-IPO shares of companies like Facebook without being an accredited investor. If a website or company doesn't mention that requirement, they are a scam. A legitimate market for private shares is SecondMarket.
"Yes, you could buy a stock on the day of its IPO. I'm a college student, and I wonder if I can buy stock from a company   right after it finishes its IPO? Yes, you can. However, unless you are friends or family of an employee, chances are you'll be paying a higher price than you think as there is generally a fair bit of hype on most  IPOs that allows some people to ""flip them"" which means someone is buying at a higher price. If I am not allowed to buy its stocks immediately after they go on   sell, how long do I have to wait? Generally I'd wait until the hype dies down as if you look at most historical IPOs the stock could be bought cheaper later but that's just my perspective. And also who are allowed to buy the stocks at the first minute they   are on sell? Anyone but keep in mind that while an IPO may be priced at $x, the initial trades may be a few times that value and the stock may come down over time. Facebook could be an example to consider of a company that had an IPO at one price and then came down for a little while on its chart over the past couple of years." The other answer has some good points, to which I'll add this:  I believe you're only considering a company's Initial Public Offering (IPO), when shares are first offered to the public.  An IPO is the way most companies get a public listing on the stock market. However, companies often go to market again and again to issue/sell more shares, after their IPO.  These secondary offerings don't make as many headlines as an IPO, but they are typical-enough occurrences in markets. When a company goes back to the market to raise additional funds (perhaps to fund expansion), the value of the company's existing shares that are being traded is a good indicator of what they may expect to get for a secondary offering of shares. A company about to raise money desires a higher share price, because that will permit them to issue less shares for the amount of money they need.  If the share price drops, they would need to issue more shares for the same amount of money – and dilute existing owners' share of the overall equity further. Also, consider corporate acquisitions:  When one company wants to buy another, instead of the transaction being entirely in cash (maybe they don't have that much in the bank!), there's often an equity component, which involves swapping shares of the company being acquired for new shares in the acquiring company or merged company.  In that case, the values of the shares in the public marketplace also matter, to provide relative valuations for the companies, etc. "Bloomberg suggests that two Fidelity funds hold preferred shares of Snapchat Inc.. Preferred shares hold more in common with bonds than with ordinary stock as they pay a fixed dividend, have lower liquidity, and don't have voting rights. Because of this lower liquidity they are not usually offered for sale on the market. Whether these funds are allowed to hold such illiquid assets is more a question for their strategy document than the law; it is completely legal for a company to hold a non-marketable interest in another, even if the company is privately held as Snapchat is. The strategy documents governing what the fund is permitted to hold, however, may restrict ownership either banning non-market holdings or restricting the percentage of assets held in illiquid instruments. Since IPO is very costly, funds like these who look to invest in new companies who have not been through IPO yet are a very good way of taking a diversified position in  start-ups. Since they look to invest directly rather than through the market they are an attractive, low cost way for start-ups to generate funds to grow. The fund deals directly with the owners of the company to buy its shares. The markdown of the stock value reflects the accounting principle of marking to market (MTM) financial assets that do not have a trade price so as to reflect their fair value. This markdown implies that Fidelity believe that the total NPV of the company's net assets is lower than they had previously calculated. This probably reflects a lack of revenue streams coming into the business in the case  of Snapchat. edit: by the way, since there is no market for start-up ""stocks"" pre-IPO my heart sinks a little every time I read the title of this question. I'm going to be sad all day now :(." "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!" people claim that these sites are scams  I would like to know which idiots or which website says so. And I would say you haven't done your research properly. At the bottom of the page you can see this, on IG's website, very important quote authorised and regulated by the Financial Conduct Authority Plus500UK Ltd is authorised and regulated by the Financial Conduct Authority Secondly you go and check the authencity of the firm in question on this link. your money in, you might as well kiss it goodbye This might be true because they trade in products, which if you don't understand you will more or less will loose your money. N.B. I have an account with IG for the past 5 years and they haven't scammed me yet. "This is definitely a scam. My husband was inquiring with a ""company"" that was offering him to be. Representative for them. He got the same job details but the company was called Ceneo. I did due diligence and found that the real Ceneo has no problems receiving money directly from buyers around the world. The fake company mirrored their website, posted jobs on the net,hoping to ""employ"" unsuspecting people in the U.S. This is their reply to my husband when he asked the job details. DO NOT GET SCAMMED and held accountable for money laundering." Not going to happen for Facebook since there will be too much demand and the order will go to the top clients of the underwriting investment banks.  In general though, if you wanted a piece of a smaller IPO you'd just have to get in touch with a broker whose investment banking department is on the underwriting syndicate (say Merrill Lynch or Smith Barney) since IPOs often have a percentage that they allocate to retail clients (i.e. you) as well as institutional (i.e. hedge funds, pension funds, mutual funds etc.). The more in demand the IPO the harder it is to get a piece. "There is one other factor that I haven't seen mentioned here.  It's easy to assume that if you buy a stock, then someone else (another stock owner) must have sold it to you.  This is not true however, because there are people called ""market makers"" whose basic job is to always be available to buy shares from those who wish to sell, and sell shares to those who wish to buy.  They could be selling you shares they just bought from someone else, but they also could simply be issuing shares from the company itself, that have never been bought before. This is a super oversimplified explanation, but hopefully it illustrates my point."