How meaningful is the “stock price” of a stock?
Prices quoted are primarily the offer prices quoted by the numerous market makers on the stock exchange(s) willing to sell you the stock. There is another price which generally isn't seen on these websites, the bid prices, which are lower prices quoted by buyers and market makers willing to buy your shares from you. You wouldn't see those prices, unless you login to your trade terminal. How meaningful are they to you depends on what you want to do buy or sell. If you want to buy then yes they are relevant. But if you want to sell, then no. And remember some websites delay market information by 15 minutes, in case of Google you might have seen that the volume is delayed by 15 minutes. So you need to consider that also while trading, but mayn't be a concern unless you are trying to buy out the company. The information on GOOG or other sites is the average price of the stock and is indicative of the price at with the stock would be available. The actual trades happen at different values throught the day ...  So the prices are good for most purposes and if you need the exact prices, you can thne decided to log into you trading terminal and get the actual quotes   This is similar to FX quotes or any other such quotes and give you a general sense
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. Actually, total return is the most important which isn't necessarily just price change as this doesn't account for dividends that may be re-invested.  Thus, the price change isn't necessarily that useful in terms of knowing what you end up with as an ending balance for an investment. Secondly, the price change itself may be deceptively large as if the stock initial price was low, e.g. a few dollars or less adjusting for stock splits as most big companies will split the stock once the price is high enough, then the percentages can be quite large years later. Something else to consider is the percentage change would be based on what as the initial base.  The price at the start of the chart or something else?  Carefully consider what you want the initial starting point to be in determining price shifts here as one could take either end and claim a rationale for using it. Most people want to look at the price to get an idea of what would X shares cost to purchase rather than look at the percentage change from day to day. "I probably don't understand something. I think you are correct about that.  :) The main way money enters the stock market is through investors investing and taking money out. Money doesn't exactly ""enter"" the stock market.  Shares of stock are bought and sold by investors to investors.  The market is just a mechanism for a buyer and seller to find each other. For the purposes of this question, we will only consider non-dividend stocks. Okay. When you buy stock, it is claimed that you own a small portion of the company. This statement has no backing, as you cannot exchange your stock for the company's assets. For example, if I bought $10 of Apple Stock early on, but it later went up to $399, I can't go to Apple and say ""I own $399 of you, here you go it back, give me an iPhone."" The only way to redeem this is to sell the stock to another investor (like a Ponzi Scheme.) It is true that when you own stock, you own a small portion of the company.  No, you can't just destroy your portion of the company; that wouldn't be fair to the other investors.  But you can very easily sell your portion to another investor.  The stock market facilitates that sale, making it very easy to either sell your shares or buy more shares. It's not a Ponzi scheme.  The only reason your hypothetical share is said to be ""worth"" $399 is that there is a buyer that wants to buy it at $399.  But there is a real company behind the stock, and it is making real money. There are several existing questions that discuss what gives a stock value besides a dividend: The stock market goes up only when more people invest in it. Although the stock market keeps tabs on Businesses, the profits of Businesses do not actually flow into the Stock Market. In particular, if no one puts money in the stock market, it doesn't matter how good the businesses do. The value of a stock is simply what a buyer is willing to pay for it.  You are correct that there is not always a correlation between the price of a stock and how well the company is doing.  But let's look at another hypothetical scenario. Let's say that I started and run a publicly-held company that sells widgets.  The company is doing very well; I'm selling lots of widgets.  In fact, the company is making incredible amounts of money.  However, the stock price is not going up as fast as our revenues.  This could be due to a number of reasons: investors might not be aware of our success, or investors might not think our success is sustainable.  I, as the founder, own lots of shares myself, and if I want a return on my investment, I can do a couple of things with the large revenues of the company: I can either continue to reinvest revenue in the company, growing the company even more (in the hopes that investors will start to notice and the stock price will rise), or I can start paying a dividend.  Either way, all the current stock holders benefit from the success of the company." It depends completely on the current order book for that security.  There is literally no telling how that buy order would move the price of a stock in general. Price, whether related to a stock or ETF, has little to do with anything.  The fund or company has a total value and the value is distributed among the number of units or shares.   Vanguard's S&P ETF has a unit price of $196 and Schwab's S&P mutual fund has a unit price of $35, it's essentially just a matter of the fund's total assets divided by number of units outstanding. Vanguard's VOO has assets of about $250 billion and Schwab's SWPPX has assets of about $25 billion. Additionally, Apple has a share price of $100, Google has a share price of $800, that doesn't mean Google is more valuable than Apple.  Apple's market capitalization is about $630 billion while Google's is about $560 billion.  Or on the extreme a single share of Berkshire's Class A stock is $216,000, and Berkshire's market cap is just $360 billion.   It's all just a matter of value divided by shares/units. "The share price on its own has little relevance without looking at variations. In your case, if the stock went from 2.80 to 0.33, you should care only about the 88% drop in value, not what it means in pre-split dollar values. You are correct that you can ""un-split"" to give you an idea of what would have been the dollar value but that should not give you any more information than the variation of 88% would. As for your title question, you should read the chart as if no split occurred as for most intents and purposes it should not affect stock price other than the obvious split." Really not sure with this one and I don't want to cheat and look up an answer.  I'd say you could find the high/low points of the stock over the last year or two and see how large the spread is between those values and the average price of the stock over the same time period. "Maria, there are a few questions I think you must consider when considering this problem. Do fundamental or technical strategies provide meaningful information? Are the signals they produce actionable? In my experience, and many quantitative traders will probably say similar things, technical analysis is unlikely to provide anything meaningful. Of course you may find phenomena when looking back on data and a particular indicator, but this is often after the fact. One cannot action-ably trade these observations. On the other hand, it does seem that fundamentals can play a crucial role in the overall (typically long run) dynamics of stock movement. Here are two examples, Technical: suppose we follow stock X and buy every time the price crosses above the 30 day moving average. There is one obvious issue with this strategy - why does this signal have significance? If the method is designed arbitrarily then the answer is that it does not have significance. Moreover, much of the research supports that stocks move close to a geometric brownian motion with jumps. This supports the implication that the system is meaningless - if the probability of up or down is always close to 50/50 then why would an average based on the price be predictive? Fundamental: Suppose we buy stocks with the best P/E ratios (defined by some cutoff). This makes sense from a logical perspective and may have some long run merit. However, there is always a chance that an internal blowup or some macro event creates a large loss.  A blended approach: for sake of balance perhaps we consider fundamentals as a good long-term indication of growth (what quants might call drift). We then restrict ourselves to equities in a particular index - say the S&P500. We compare the growth of these stocks vs. their P/E ratios and possibly do some regression. A natural strategy would be to sell those which have exceeded the expected return given the P/E ratio and buy those which have underperformed. Since all equities we are considering are in the same index, they are most likely somewhat correlated (especially when traded in baskets). If we sell 10 equities that are deemed ""too high"" and buy 10 which are ""too low"" we will be taking a neutral position and betting on convergence of the spread to the market average growth. We have this constructed a hedged position using a fundamental metric (and some helpful statistics). This method can be categorized as a type of index arbitrage and is done (roughly) in a similar fashion. If you dig through some data (yahoo finance is great) over the past 5 years on just the S&P500 I'm sure you'll find plenty of signals (and perhaps profitable if you calibrate with specific numbers). Sorry for the long and rambling style but I wanted to hit a few key points and show a clever methods of using fundamentals." Ideally, stock price reflects the value of the company, the dividends it is expected to pay, and what people expect the future value of the company to be. Only one of those (maybe one and a half) is related to current  sales, and not always directly. Short-term motion of a stock is even less directly linked, since it also reflects previous expectations. A company can announce disappointing sales and see its stock go up, if the previous price was based on expecting  worse news. It seems like you want to compare the company's values not necessarily the stock price.  Why not get the total outstanding shares and the stock price, generate the market cap.  Then you could compare changes to market cap rather than just share price. I have heard that people say the greater earning means greater   intrinsic value of the company. Then, the stock price is largely based   on the intrinsic value. So increasing intrinsic value due to   increasing earning will lead to increasing stock price. Does this make   sense ? Yes though it may be worth dissecting portions here. As a company generates earnings, it has various choices for what it can do with that money. It can distribute some to shareholders in the form of dividends or re-invest to generate more earnings. What you're discussing in the first part is those earnings that could be used to increase the perceived value of the company. However, there can be more than a few interpretations of how to compute a company's intrinsic value and this is how one can have opinions ranging from companies being overvalued to undervalued overall. Of Mines, Forests, and Impatience would be an article giving examples that make things a bit more complex. Consider how would you evaluate a mine, a forest or a farm where each gives a different structure to the cash flow? This could be useful in running the numbers here. It's an SEC standard for certain items. It is NOT indicative of fair market value. It could be useful to compare companies to each other, but again, would not indicate intrinsic value.  Does it make sense, for example, to discount Saudi Aramco at the same exact rate as BP or Exxon? A company's stock value is indicative of the market's collective belief of the future of the company. The relationship of between price and book value will vary according to the quality of the company, the category of stock, etc. In extreme cases, say Bank of America, the stock trades at a fraction of book, because BOA's books are a fantasy by most people's reckoning. Large-scale price range of a stock isn't directly meaningful; that reflects how many shares exist, not just how desirable they are. A stock split, for example, doubles the number of shares everyone holds while cutting the value of each share in half; that's meaningless except that it makes the shares a bit easier to trade in. Change in price is more interesting. In the case of energy companies, that often reflects major changes in energy supply, distribution, use, or how well positioned people feel the company is for the next change in these. Fracking's surge and the questions raised against it, whether a major pipeline will or won't be built, international energy price trends, breakthroughs in renewables... if it might affect energy price, it might affect the company's strength, both absolute and relative to others. In other words, the same kinds of things that affect any stock. It will usually take a week or two for changes to your withholding to take effect in payroll.  However 0 deductions will withhold more per check than 3.  So if at 0 deductions you are having to pay in April then I would suggest not changing your W2 to 3 deductions.  Instead in the section for extra with holding add $25 per week.  This should leave you with a more manageable return in April.