Why do stock prices change? [duplicate]
"None of that is filtered my way as a ""part owner"". Sure it is, it's just not always obvious. When a company makes money it either: Other then the fourth option, the first three all increase the total value of the company.  If you owned 1% of a company that was worth X, and is now worth X+1, the value of that 1% ownership should go up as well. One model of the value of a share of stock is the present value of all future cash flows that the company produces for its shareholders, which would be either through dividends, earnings (provided that they are invested back into the company) or through liquidation (sale).  So as earnings increase (or more accurately as projected future earnings increase), so does the value of a share of the company. Also note that the payment of dividends causes the price of a stock to go down when the dividend is paid, since that's equity (cash) that's leaving the company, reducing the value of the company by an equivalent amount. Of course, there's also something to be said for the behavioral aspect of investing, meaning that people sometimes invest in companies that they like, and sell stock of companies that they don't like or disagree with (e.g. Nordstrom's)." "As I understand it, a company raises money by sharing parts of it (""ownership"") to people who buy stocks from it.  It's not ""ownership"" in quotes, it's ownership in a non-ironic way.  You own part of the company.  If the company has 100 million shares outstanding you own 1/100,000,000th of it per share, it's small but you're an owner.  In most cases you also get to vote on company issues as a shareholder. (though non-voting shares are becoming a thing).  After the initial share offer, you're not buying your shares from the company, you're buying your shares from an owner of the company.  The company doesn't control the price of the shares or the shares themselves. I get that some stocks pay dividends, and that as these change the price of the stock may change accordingly. The company pays a dividend, not the stock.  The company is distributing earnings to it's owners your proportion of the earnings are equal to your proportion of ownership.  If you own a single share in the company referenced above you would get $1 in the case of a $100,000,000 dividend (1/100,000,000th of the dividend for your 1/100,000,000th ownership stake). I don't get why the price otherwise goes up or down (why demand changes) with earnings, and speculation on earnings.  Companies are generally valued based on what they will be worth in the future.   What do the prospects look like for this industry?  A company that only makes typewriters probably became less valuable as computers became more prolific.  Was a new law just passed that would hurt our ability to operate?  Did a new competitor enter the industry to force us to change prices in order to stay competitive?  If we have to charge less for our product, it stands to reason our earnings in the future will be similarly reduced.   So what if the company's making more money now than it did when I bought the share? Presumably the company would then be more valuable. None of that is filtered my way as a ""part owner"".  Yes it is, as a dividend; or in the case of a company not paying a dividend you're rewarded by an appreciating value. Why should the value of the shares change? A multitude of reasons generally revolving around the company's ability to profit in the future." In addition to D. Stanley's very fine answer, the price of stocks change as a result of changing market conditions and the resulting investor estimation of its effect on the company's future earnings. Take these examples. Right now, in the USA, there is a housing shortage; that is, there are fewer houses available for purchase than there are willing buyers. Investors will correctly assume that the future earnings of home builders will be higher than they were, say ten years ago. Seeking to capitalize on these higher earnings, they will try to buy the stocks. However, the current owners of the stock, potentially the sellers, know the same thing as the investor-buyer and therefore demand a premium to entice a sale. The price of the stock has risen. The reverse is true, also. Brick and mortar retailers are declining as more consumers prefer on-line retail shopping. The current owners of these stocks will probably want to sell their stock before it is worth even less. The investor-buyer also knows the same facts; that future earnings will most likely be less for these companies. The potential buyer offers a very low price to entice a sale. The price of the stock has fallen. Finally, the price of stocks rise and fall with general market conditions. As an example, assume that next months jobs report is released showing that 350,000 new jobs were created in July. Investors will believe that if companies are hiring, then the companies are doing well; they are selling products and services at a higher than expected rate, requiring that they add new employees. They will also conclude that those 350,000 new employees will be spending their salaries to buy not just food, clothing and shelter, but also a few luxuries like a newer car, a TV, perhaps even a new home (please see paragraph 2!). All of these companies will have more business, more earnings and, likely, a higher stock price.
Yes, but only in a relatively short term. False news or speculations can definitely change the stock price, sometimes even significantly. However, the stock price will eventually (in the long-term) correct itself and head to the right direction. As yet another explanation of why it does not really matter, you can look at this from the valuation point of view. Stock price is the present value of its future cash flows (be it free cash flow of the firm or dividends, depending on the model). Let's have a look at the dividends case. Imagine, the price of the stock is based on only three dividends streams $5 dollars each: dividend to be paid today, in year 1, and in year 2. Each should be discounted back to today (say, at 10%), except today's dividend, since today is now.  Once that dividend is paid, it is no longer in the stream of cash flows. So if we just delete that first $5 from the formula, the price will adjust itself down by the amount of the dividend to $8.68. NOTE that this is a very simple example, since in reality cash flows streams are arguably infinite and because there are many other factors affecting stock price. But simply for your understanding, this example should provide you with the reason simply from the valuation perspective. Simple, there is no magic price adjustment after sales - why do you expect the stock price to change? The listed price of a stock is what someone was willing to pay for it in the last deal that was concluded. If any amount of stock changes ownership, this might have the effect that other people are willing to buy it for a higher price - or not. It is solely in the next buyer's decision what he is willing to pay. Example: if you think Apple stocks are worth 500$ a piece, and I buy a million of them, you might still think they are worth 500$. Or you might see this as a reason that they are worth 505$ now. I don't know why stocks in some industries tend to have lower prices per share than others. It doesn't really matter much. Whether a company has 1,000,0000 shares selling for $100 each, or 10,000,000 shares selling for $10 each, either way the total value is the same. Companies generally like to keep the share price relatively low so that if someone wants to buy a small amount, they can. Like if the price was $10,000 per share, than an investor with less than $10,000 to put in that one stock would be priced out of the market. If it's $10, then if someone wants $10 they can buy one share, and if someone wants $10,000 they can buy 1000 shares. As to why energy stocks are volatile, I can think of several reasons. One, in our current world, energy is highly susceptible to politics. A lot of the world's energy comes from the Middle East, which is a notoriously unstable region. Any time there's conflict there, energy supplies from the region become uncertain. Oil-producing countries may embargo countries that they don't like. A war will, at the very least, interfere with transportation and shipping, and may result in oil wells being destroyed. Etc. Two, energy is consumed when you use it, and most consumers have very limited ability to stockpile. So you're constantly buying the energy you need as you need it. So if demand goes down, it is reflected immediately. Compare this to, say, clothing. Most people expect to keep the same clothes for years, wearing them repeatedly. (Hopefully washing them now and then!) So if for some reason you decided today that you only need three red shirts instead of four, this might not have any immediate impact on your buying. It could be months before you would have bought a new red shirt anyway. There is a tendency for the market to react rather slowly to changes in demand for shirts. But with energy, if you decide you only need to burn 3 gallons of gas per week instead of 4, your consumption goes down immediately, within days. Three, really adding to number two, energy is highly perishable, especially some forms of energy. If a solar power station is capable of producing 10 megawatts but today there is only demand for 9 megawatts, you can't save the unused megawatt for some future time when demand is higher. It's gone. (You can charge a battery with it, but that's pretty limited.) You can pile up coal or store natural gas in a tank until you need it, but you can't save the output of a power plant. Note numbers two and three also apply to food, which is why food production is also very volatile. The value of the asset doesn't change just because of the exchange rate change. If a thing (valued in USD) costs USD $1 and USD $1 = CAN $1 (so the thing is also valued CAN $1) today and tomorrow CAN $1 worth USD $0.5 - the thing will continue being worth USD $1. If the thing is valued in CAN $, after the exchange rate change, the thing will be worth USD $2, but will still be valued CAN $1. What you're talking about is price quotes, not value. Price quotes will very quickly reach the value, since any deviation will be used by the traders to make profits on arbitrage. And algo-traders will make it happen much quicker than you can even notice the arbitrage existence. You would think that share prices is just a reflection of how well the company is doing but that is not always the case. Sometimes it reflects the investor confidence in the company more than the mere performance. So for instance if some oil company causes some natural disaster by letting one of there oil tankers crash into a coral reef then investor confidence my take a big hit and share prices my fall even if the bottom line of the company was not all that effected. Most stocks are not actively trades by lots of people.   When you buy or sell a stock the price is set by the “order book” – that is the other people looking to trade in the given stock at the same time. Without a large number of active traders, it is very likely the pricing system will break down and result in widely changing prices second by second.   Therefore for the market to work well, it need most people to be trading at the same time. Changes in implied volatility are caused by many things, of course, and it is tough to isolate the effect you are describing, but let's try to generalize for a moment. Implied volatility is generally a measure of how much expect uncertainty there is about the future price of the stock.  Uncertainty generally is higher in periods including earnings announcements because it is significant new information about the company's fortunes can make for significant changes in the price. However, you could easily have the case where the earnings are good and for some reason the market is very certain that the earnings will be good and near a certain level.  In that case the price would rise, but the implied volatility could well be lower because the market believes that there will be no significant new information in the earnings announcement. A common (and important) measure of a stock's value is the price/earnings ratio, so an increase in earnings will normally cause the stock price to increase. However, the price of the stock is based on a guess of the value of the company some time (6 months?) in the future. So an increase in earnings today probably makes a higher earnings more likely in the future, and puts upward pressure on the price of the stock. There are a lot of other factors in stock prices, such as publicity, dividends, revenue, trends, company stability, and company history. Earnings is a very important factor, but not the only factor determine the value (and so stock price) of a company. If you look at S&P 500's closing price for the first trading day on December and January for the last 20 years, you will see that for 10 of these years, stocks did better overall and for 10 others they did worse. Thus you can see that the price of stocks do no necessarily increase. You can play around with the data here There are multiple factors at play that drive stock price movements, but one that can be visualized is that stocks can be priced relative to other (similar stocks).  When one stock price goes up without fundamental changes (i.e. daily market noise/movements), it becomes slightly more expensive relative to it's peers.  Opportunists will sell the now slightly more expensive stock, while others may buying the slightly cheaper (relatively) peer stock.    Imagine millions of transactions like this happening throughout each hour, downward selling pressure on a stock that rises too fast in value relative to it's peers or the market, and upward buying pressure on stocks that are relatively cheaper than it's peers.  It pushes two stocks towards an equilibrium that is directionally the same.    Another way to think of it is lets say tomorrow there is $10B in net new dollars moved into buy orders for stocks that comes from net selling of bonds (this is also partly why bonds/stocks are generally inversely related).  That money goes to buys stocks ABC, XYZ, EFG.  As the price of those goes up with more buying pressure, stocks JKL, MNO, PQR are relatively a tad cheaper, so some money starts to flow into there.  Repeat until you get a large majority of the stocks that buyers are willing to buy and you can see why stocks move in the same direction a lot of times. "There is no fundamental, good reason, I think; ""that's just how it's done"" (which is what all the other answers seem to be saying, w/o coming out and admitting it). Just guessing, but I'll bet most of the reason is historical: Before up-to-the-moment quotes were readily available, that was a bit tedious to calculate/update the fund's value, so enacted-laws let it be done just once per day.  (@NL7 quotes the security act of 1940, which certainly has been updated, but also still might contain the results of crufty rationales, like this.) There are genuinely different issues between funds and stocks, though: One share of a fund is fundamentally different from one share of stock: There is a finite supply of Company-X-stock, and people are trading that piece of ownership around, and barter to find an mutually-agreeable-price.  But when you buy into a mutual-fund, the mutual-fund ""suddenly has more shares"" -- it takes your money and uses it to buy shares of the underlying stocks (in a ratio equal to its current holdings).  As a consequence: the mutual fund's price isn't determined by two people bartering and agreeing on a price (like stock); there is exactly one sane way to price a mutual fund, and that's the weighted total of its underlying stock.  If you wanted to sell your ownership-of-Mutual-Fund-Z to a friend at 2:34pm, there wouldn't be any bartering, you'd just calculate the value based on the stated-value of the underlying stock at that exact moment. So: there's no inherent reason you can't instantaneously price a mutual fund.  BUT people don't really buy/sell funds to each other -- they go to the fund-manager and essentially make a deposit-or-withdraw.  The fund-manager is only required by law to do it once a day (and perhaps even forbidden from doing it more often?), so that's all they do. [Disclaimer: I know very little about markets and finance. But I recognize answers that are 'just because'.]" It seems to me that your main question here is about why a stock is worth anything at all, why it has any intrinsic value, and that the only way you could imagine a stock having value is if it pays a dividend, as though that's what you're buying in that case.  Others have answered why a company may or may not pay a dividend, but I think glossed over the central question.  A stock has value because it is ownership of a piece of the company. The company itself has value, in the form of: You get the idea. A company's value is based on things it owns or things that can be monetized.  By extension, a share is a piece of all that. Some of these things don't have clear cut values, and this can result in differing opinions on what a company is worth.  Share price also varies for many other reasons that are covered by other answers, but there is (almost) always some intrinsic value to a stock because part of its value represents real assets. "You can think of the situation as a kind of Nash equilibrium.  If ""the market"" values stock based on the value of the company, then from an individual point of view it makes sense to value stock the same way. As an illustration, imagine that stock prices were associated with the amount of precipitation at the company's location, rather than the assets of the company.  In this imaginary stock market, it would not benefit you to buy and sell stock according to the company's value.  Instead, you would profit most from buying and selling according to the weather, like everyone else.  (Whether this system — or the current one — would be stable in the long-term is another matter entirely.)" all of these examples are great if you actually believe in fundamentals, but who believes in fundamentals alone any more? Stock prices are driven by earnings, news, and public perception. For instance, a pharma company named Eyetech has their new macular degeneration drug approved by the FDA, and yet their stock price plummeted. Typically when a small pharma company gets a drug approved, it's off to the races. But, Genetech came out said their macular degeneration drug was going to be far more effective, and that they were well on track for approval.