One Share Stock Reverse Split
Any time there is a share adjustment from spin-off, merger, stock split, or reverse slit; there is zero chance for the stockholders to hang on to fractional shares. They are turned into cash.   For the employees in the 401K program or investors via a mutual fund or ETF this isn't a problem. Because the fraction of a share left over is compared to the thousands or millions of shares owned by the fund as a collective. For the individual investor in the company this can be a problem that they aren't happy about.  In some cases the fractional share is a byproduct that will result from any of these events. In the case of a corporate merger or spin-off most investors will not have an integer number of shares, so that fraction leftover that gets converted to cash isn't a big deal. When they want to boost the price to a specific range to meet a regulatory requirement, they are getting desperate and don't care that some will be forced out. In other cases it is by design to force many shareholders out. They want to go private. They to 1-for-1000 split. If you had less than 1000 shares pre-split then you will end up with zero shares plus cash. They know exactly what number to use. The result after the split is that the number of investors is small enough they they can now fall under a different set of regulations. They have gone dark, they don't have to file as many reports, and they can keep control of the company.  Once the Board of Directors or the majority stockholders votes on this, the small investors have no choice.
In theory*, if a company has 1m shares at $10 and does a 10 for 1 split, then the day after it has 10m shares at $1 (assuming no market move). So both the price and the number of share change, keeping the total value of the company unchanged. Regarding your BIS, I suspect that the new number of shares has not been reported yet because it's an ETF (the number of shares in issue changes everyday due to in/out flows). Your TWX example is not ideal either because there was a spin off on the same day as the stock split so you need to separate the two effects. * Some studies have documented a positive stock split effect - one of the suggested reasons is that the stock becomes more liquid after the split. But other studies have rejected that conclusion, so you can probably safely consider that on average it will not have a material effect. (12 * 100) * 1.01 = 1212 Assuming the $12 ask can absorb your whole 100 share order. Firstly a stock split is easy, for example each unit of stock is converted into 10 units.  So if you owned 1% of the company before the stock split, you will still own 1% after the stock split, but have 10 times the number of shares.   The company does not pay out any money when doing this and there is no effect on tax for the company or the share holder. Now onto stock dividend… When a company make a profit, the company gives some of the profit to the share holders as a dividend; this is normally paid in cash.  An investor may then wish to buy more shares in the company using the money from the dividend.      However buying shares used to have a large cost in broker charges etc. Therefore some companies allowed share holders to choose to have the dividend paid as shares.   The company buys enough of their own shares to cover the payout, only having one set of broker charges and then sends the correct number of shares to each share holder that has opted for a stock dividend.  (Along with any cash that was not enough to buy a complete share.) This made since when you had paper shares and admin costs where high for stock brokers.   It does not make sense these days. A stock dividend is taxed as if you had been paid the dividend in cash and then brought the stock yourself. "Note that these used to be a single ""common"" share that has ""split"" (actually a ""special dividend"" but effectively a split). If you owned one share of Google before the split, you had one share giving you X worth of equity in the company and 1 vote. After the split you have two shares giving you the same X worth of equity and 1 vote. In other words, zero change. Buy or sell either depending on how much you value the vote and how much you think others will pay (or not) for that vote in the future.  As Google issues new shares, it'll likely issue more of the new non-voting shares meaning dilution of equity but not dilution of voting power. For most of us, our few votes count for nothing so evaluate this as you will.  Google's founders believe they can do a better job running the company long-term when there are fewer pressures from outside holders who may have only short-term interests in mind. If you disagree, or if you are only interested in the short-term, you probably shouldn't be an owner of Google. As always, evaluate the facts for yourself, your situation, and your beliefs." There has been a lot of research on the effects of stock splits. Some studies have concluded that: However note that (i) these are averages over large samples and does not say it will work on every split and (ii) most of the research is a bit dated and more recent papers have often struggled to find any significant performance impact after 1990, possibly because the effect has been well documented and the arbitrage no longer exists. This document summarises the existing research on the subject although it seems to miss some of the more recent papers. More practically, if you pay a commission per share, you will pay more commissions after the split than before. Bottom line: don't overthink it and focus on other criteria to decide when/whether to invest. Securities change in prices. You can buy ten 10'000 share of a stock for $1 each one day on release and sell it for $40 each if you're lucky in the future for a gross profit of 40*10000 = 400'0000 It's not that uncommon but it doesn't usually come from standard purchases.  Investopedia explains: Definition of 'Fractional Share' A share of equity that is less than one full share. Fractional shares usually come about from stock splits, dividend reinvestment plans (DRIPs) and similar corporate actions. Normally, fractional shares cannot be acquired from the market. However, there is at least one investment firm that markets itself as offering fractional shares.  Fractional investing makes more sense, since an investor's perspective is to invest a certain number of dollars into equity, not to buy a certain number of shares that closely mirror the dollar commitment. Investopedia has a good definition. Stock dividends are similar to cash dividends; however, instead of cash, a company pays out stock. Stock splits occur when a company perceives that its stock price may be too high. Stock splits are usually done to increase the liquidity of the stock (more shares outstanding) and to make it more affordable for investors to buy regular lots (a regular lot = 100 shares). I'm going to guess that you found this because of a stock screener.  This company went through a 1:20 reverse split on June 30, so every 20 shares outstanding became a single share.  Where before you had 20 shares worth $100 you now have 1 share worth $100, the value of the company doesn't change because of a split.  This company was never trading for $30+ per share.  Reverse splits are typical of a floundering company trading on an exchange that has a minimum share price requirement.  While reverse splits don't change the value of the company, just the number of shares outstanding and the price per share, no healthy company performs a reverse split.  Reverse splits are generally a massive signal to jump ship... The company seems to be trading for $1 right now, why the value fell from a pre-split $1.65 ($33/20) to $1 is anyone's guess; how the company ever got to $1.65 is also anyone's guess. But looking at the most recent 10-Q there are numerous causes for concern:  Note 2. Capital Stock On March 6, 2017, the Company issued as compensation for services provided a total of 650,000 common shares with a fair value of $390,000 to a third party. The fair value of the shares was based on the price quoted on the OTC pink sheets on the grant date. this indicates a share price of $0.60 ($390,000/650,000) as of 3/6/2017, just to reinforce that the google price chart doesn't show the true past but a past adjusted for the split Results of Operations The three months ended March 31, 2017 compared to the three months ended March 31, 2016 For the three months ended March 31, 2017 compared to the three months ended March 31, 2016, total revenues were $0 and $0, respectively, and net losses from operations were $414,663 and $26,260, respectively. The net losses were attributable to costs attributable to operating as a public company, in particular, common stock with a valuation of $390,000 that was issued to an investor relations firm in the first quarter of 2017. Going Concern As of March 31, 2017, there is substantial doubt regarding our ability to continue as a going concern as we have not generated sufficient cash flow to fund our proposed business. We have suffered recurring losses from operations since our inception. In addition, we have yet to generate an internal cash flow from our business operations or successfully raised the financing required to develop our proposed business. As a result of these and other factors, our independent auditor has expressed substantial doubt about our ability to continue as a going concern.    Liquidity and Capital Resources We had no cash as of the date of March 31, 2017. Additionally, since there is no balance sheet in the last 10-Q (another bad sign), the last annual report 10-K has this balance sheet: So the company: So why did the stock value plummet? It's anyones' guess but there is no shortage of ways to justify it.   In fact, it's reasonable to ask how is this company still worth $3mm ($1 * 3mm shares outstanding)... The reason to do a stock split is to get the price of the stock down to an affordable range. If your stock costs $100,000 per share, you are seriously cutting in to the number of people who can afford to buy it. I can think of two reasons NOT to do a stock split. The biggest is, Why bother? If your stock is trading at a reasonable price, why change anything? It takes time and effort, which equals money, to do a stock split. If this serves no purpose, you're just wasting that effort. The other reason is that you don't want to drive your stock price down too low. Low prices are normally associated with highly speculative start-up companies, and so can give a wrong impression of your company. Also, low prices make it difficult for the price to reflect small changes. If your stock is trading at $10.00, a 1/2 of 1% change is 5 cents. But if it's trading at $1.50, a 1/2 of 1% change is a fraction of a penny. Does it go up by that penny or not? You've turned a smooth scale into a series of hurdles. The difference is that Yahoo is showing the unadjusted price that the security traded for on that date, while google is adjusting for price splits. This means that Google is showing how much you would have had to pay to get what is now one share. Since 1979, JNJ has split 3-for-1 once, and 2-for-1 four times. 3x2x2x2x2 = 48. If you bought 1 share at that time, you would now have 48 shares today. Yahoo is showing a price of $66 for what was then 1 share. $66/48 = 1.375, which Google rounds to 1.38. You can see this if you get the prices from May 14-21, 1981. The stock split 3-for-1, and the price dropped from 108 to 36.38. Yahoo's adjusted close column has not been accurate since they re-wrote the Finance website. It now just represents the closing price. The other relevant field on Yahoo is the Adj. Close. This adjusts for splits, but also adjusts for dividends. Hence why this doesn't match either the Google or Yahoo numbers. GT BIOPHARMA, INC. ANNOUNCES REVERSE STOCK SPILT AS PART OF OXIS-GEORGETOWN PLANNED MERGER LOS ANGELES, CA / ACCESSWIRE / August 21, 2017 / GT Biopharma Inc.   (formerly known as Oxis International, Inc.) announced today a   1-for-300 reverse stock split. Shareholders of GT Biopharma Inc.   (OTCQB: OXIS and Euronext Paris: OXI.PA) will be issued 1 share of   common stock for every 300 shares common stock that they owned. If you owned fewer than 300 shares, they cashed you out. For each class A share (GOOGL) there's a class C share (GOOG), hence the missing half in your calculation. The almost comes from the slightly higher market price of the class A shares (due to them having voting powers) over class C (which have no voting powers). There's also class B share which is owned by the founders (Larry, Sergei, Eric and perhaps some to Stanford University and others) and differs from class A by the voting power. These are not publicly traded. The 1 for 1 split could be the case where a company is being split into two parts. The new part may be spun off, or sold to another company. Any time a company splits into two parts, the ratio of the resulting companies needs to be determined. No, I think you are misunderstanding the Math. Stock splits are a way to control relatively where the price per share can be for a company as companies can split or reverse split shares which would be similar to taking dimes and giving 2 nickels for each dime, each is 10 cents but the number of coins has varied. This doesn't create any additional value since it is still 10 cents whether it is 1 dime or 2 nickels.  Share repurchase programs though are done to prevent dilution as executives and those with incentive-stock options may get shares in the company that increase the number of outstanding shares that would be something to note.