How does a company select a particular price for its shares?
"First, keep in mind that there are generally 2 ways to buy a corporation's shares: You can buy a share directly from the corporation. This does not happen often; it usually happens at the Initial Public Offering [the first time the company becomes ""public"" where anyone with access to the stock exchange can become a part-owner], plus maybe a few more times during the corporations existence. In this case, the corporation is offering new ownership in exchange for a price set the corporation (or a broker hired by the corporation).  The price used for a public offering is the highest amount that the company believes it can get - this is a very complicated field, and involves many different methods of evaluating what the company should be worth. If the company sets the price too low, then they have missed out on possible value which would be earned by the previous, private shareholders (they would have gotten the same share % of a corporation which would now have more cash to spend, because of increased money paid by new shareholders). If the company sets the price too high, then the share subscription might only be partially filled, so there might not be enough cash to do what the company wanted. You can buy a share from another shareholder. This is more common - when you see the company's share price on the stock exchange, it is this type of transaction - buying out other current shareholders. The price here is simply set based on what current owners are willing to sell at. The ""Bid Price"" listed by an exchange is the current highest bid that a purchaser is offering for a single share. The ""Ask Price"" is the current lowest offer that a seller is offering to sell a single share they currently own. When the bid price = the ask price, a share transaction happens, and the most recent stock price changes." "In the case of an ""initial public offering"", the brokers underwriting the share issue will look at the current earnings being generated by the company and compare these to those of other competitor companies already listed in the stock market.  For example, if a new telephone company is undertaking an initial public offering, then the share price of those telephone companies which are already traded on the stock market will serve as a reference for how much investors will be willing to pay for the new company's shares.  If investors are willing to pay 15 times earnings for telecom shares, then this will be the benchmark used in determining the new share price. In addition, comparative growth prospects will be taken into account.  Finally, the underwriter will want to see a successful sale, so they will tend to ""slightly under price"" the new shares in order to make them attractive. None of this is an exact science and we often see shares trading at a large premium to the initial offer price during the first few days of trading.  More often that not, prices then settle down to something closer to the offer price.  The initial price spike is usually the result of high demand for the shares by investors who believe that past examples of a price spike will repeat with this initial public offering.  There will also usually be high demand for the new shares from funds that specialise in shares of the type being issued. In the case of a ""rights issue"", where an existing publicly traded company wishes to raise capital by issuing new shares, the company will price the new shares at a significant discount to the current market price.  The new shares will be initially offered to existing shares holders and the discounted price is intended to encourage the existing shareholders to exercise their ""rights"" since the new shares may have the effect of diluting the value of their shares.  Any shares which are not purchased by existing share holder will then be offered for sale in the market."
In general, how does a large open market stock sale affect prices? A very general answer, all other things being equal, the price will move down. However there is nothing general. It depends on total number of shares in market and total turn over for that specific shares. The order book for the day etc. What is the maximum percentage of a company you could sell per day before the trading freezes, and what factors matter? Every stock exchange has rules that would determine when a particular stock would be suspended from trading, generally a 10-20% swing [either ways]. Generally highly liquid stock or stock during initial listing are exempt from such limits as they are left to arrive the market price ...  A large sell order may or may not swing the price for it to get suspended. At times even a small order may do ... again it is specific to a particular stock. "I think the first misconception to clear up is that you are implying the price of a stock is set by a specific person. It is not. The price of a stock is equal to the value that someone most recently traded at. If Apple last traded at $100/share, then Apple shares are worth $100. If good news about Apple hits the market and people holding the shares ask for more money, and the most recent trade becomes $105, then that is now what Apple shares are worth. Remember that generally speaking, the company itself does not sell you its shares - instead, some other investor sells you shares they already own. When a company sells you shares, it is called a 'public offering'. To get to your actual question, saying something is 'priced in' implies that the 'market' (that is, investors who are buying and selling shares in the company) has already considered the impacts of that something. For example, if you open up your newspaper and read an article about IBM inventing a new type of computer chip, you might want to invest in IBM. But, the rest of the market has also heard the news. So everyone else has already traded IBM assuming that this new chip would be made. That means when you buy, even if sales later go up because of the new chip, those sales were already considered by the person who chose the price to sell you the shares at. One principle of the stock market (not agreed to by all) is called market efficiency. Generally, if there were perfect market efficiency, then every piece of public information about a company would be perfectly integrated into its stock price. In such a scenario, the only way to get real value when buying a company would be to have secret information of some sort. It would mean that everyone's collective best-guess about what will happen to the company has been ""priced-in"" to the most recent share trade." "Something to note is that when a company announces a share buyback program there is usually a time frame and amount of shares that are important details as it isn't like the company will make one big buy back of stock generally.  Rather it may take months or even years as noted in the Wikipedia article about share repurchases. Wikipedia covers some of the technical details here but to give a specific set of answers: When a company announces a share buyback program, who do they actually   buy back the shares from?  From the Wikipedia link: ""Under US corporate law there are five primary methods of stock repurchase: open market, private negotiations, repurchase 'put' rights, and two variants of self-tender repurchase: a fixed price tender offer and a Dutch auction."" Thus, there are open market and a couple of other possibilities. Openly traded shares on a stock exchange?  Possibly, though there are other options. Is there a fixed price that   they buy back at? Sometimes.  I'd think a ""fixed price tender offer"" would imply a fixed price though the open market way may take various prices. If I own shares in that company, can I get them to buy back my shares? Selective Buy-Backs is noted in Wikipedia as: ""In broad terms, a selective buy-back is one in which identical offers are not made to every shareholder, for example, if offers are made to only some of the shareholders in the company. In the US, no special shareholder approval of a selective buy-back is required. In the UK, the scheme must first be approved by all shareholders, or by a special resolution (requiring a 75% majority) of the members in which no vote is cast by selling shareholders or their associates. Selling shareholders may not vote in favor of a special resolution to approve a selective buy-back. The notice to shareholders convening the meeting to vote on a selective buy-back must include a statement setting out all material information that is relevant to the proposal, although it is not necessary for the company to provide information already disclosed to the shareholders, if that would be unreasonable."" Thus it is possible, though how probable is another question. While not in the question, something to consider is how the buybacks can be done as a result of offsetting the dilution of employees who have stock options that may exercise them and spread the earnings over more shares, but this is more on understanding the employee stock option scenario that various big companies use when it comes to giving employees an incentive to help the stock price." The price to earnings ratio is a measure of the company's current share price compared to the annual net earnings per share.  The other way to think about this is the number of years a company would take to pay back the share price if the earnings stay constant.  This ignores factors like inflation and can be used as an indicator of risk.  During the internet bubble many companies had P/E above 24 and no possible means of earning back the share prices that were inflated largely due to speculation. Most tools like Google Finance will list the P/E for a particular quote. Try to find the P/E ratio of the Company and then Multiply it with last E.P.S, this calculation gives the Fundamental Value of the share, anything higher than this Value is not acceptable and Vice versa. "Institutions may be buying large quantities of the stock and would want the price to go up after they are done buying all that they have to buy.  If the price jumps before they finish buying then they may not make as great a deal as they would otherwise.  Consider buying tens of thousands of shares of a company and then how does one promote that?  Also, what kind of PR system should those investment companies have to disclose whether or not they have holdings in these companies.  This is just some of the stuff you may be missing here. The ""Wall street analysts"" are the investment banks that want the companies to do business through them and thus it is a win/win relationship as the bank gets some fees for all the transactions done for the company while the company gets another cheerleader to try to play up the stock." Yes, stock price is determined by the last trade price. There are always going to be people who have put in a price to buy a stock (called a bid price) and people who have put in a price to sell a stock (called an ask price). Based on your example, if the last trade price for the stock was $1.23, then you might have the following bid prices and ask prices: So if you put in a limit order to buy 100 shares at $100, you would buy the 40 shares at $1.23, the 15 shares at $1.24, and the 45 shares $1.25.  The price of the stock would go up to $1.25. Conversely, if you put in a limit order to sell 100 shares at $0.01 (I don't think any broker would allow a sell price of $0.00), you would sell 30 shares at $1.22, 20 shares at $1.21, and 50 shares at $1.20.  The price of the stock would go down to $1.20. The holders of the shares have to agree to sell them to management in a share repurchase.  Typically, share repurchases are done in the open market, causing market activity to increase the share price marginally.  This is how the company returns the value to shareholders.  The company could also negotiate a price with a mutual fund, or founder, for a large block.     If they get close to the point of purchasing all outstanding shares, this would be exactly the same as the management of the company taking the company private, buying out all existing shareholders.   To prevent a single holdout from keeping say the very last share for one million dollars or the like on the open market, they would generally propose to the board of directors the buyout terms with a price per share, and most corporate charters are written such that the directors' vote binds minority shareholders to buyout or merger decisions.  Michael Dell famously took Dell Computer private in 2013, raising external money to offer a fair price to the board, which accepted it, letting him take it back to private status.