What's the difference between shares outstanding and regular shares?
outstanding shares are the shares(regular shares) that are still tradable in the market, where the firm in question is listed. The term is primarily used to distinguish from shares held in treasury(treasury stock), which have been bought back(buybacks) from the market and aren't currently tradable in the market. Wikipedia is a bit more clearer and mentions the diluted outstanding shares(used for convertible bonds, warrants, etc) which is used to calculated diluted EPS.
Broadly, there's a bunch of stuff you need to be accounting for that's not reflected in the above, which will impact the A/D profile of an acquisition:  * Consideration paid (all cash on substantially the same terms is going to be more accretive than an all-stock transaction...because in the latter, your denominator is much bigger)  * Shares outstanding (including repurchases, in-kind dividends and option exercise)  * Financing / interest expense  * Upside / base / downside case for all of your assumptions - best to have a toggle based on a CHOOSE function that will allow the user to easily toggle between these  I'm not sure what EBITDA is getting you. EPS accretion/dilution typically looks at earnings, but you could also look at Cash EPS A/D which measures OCF/shares outstanding.  The point is, this really depends on how back of the envelope you want the A/D computation to be. At a minimum, you need an earnings schedule projected over the next 2-3 years, and you need a schedule reflecting outstanding shares over the same time period.  Your earnings buildout can have varying degrees of granularity. You can project cost synergies over the forecast period, which most obviously is going to affect your earnings, but you can also drill down further. Financing, transaction fees, etc. Your writeups and writedowns from your B/S combination may result in certain deferred tax items that will affect your bottom line over the forecast period.  Your share schedule can also have varying degrees of complexity. One way to do it is to just presume that the company will not issue any more shares, and will not repurchase any shares, and that there will be no options exercised, over the forecast period. This is a bad series of assumptions. It is likely that as options vest, if in the money, they will be exercised, resulting in dilution for existing shareholders. It is also likely that certain preferred shareholders and optionholders are going to experience adjustments to the conversion prices based on antidilution provisions in their securities. These may be but are not always disclosed in the 10K.  Last point - models are tools. What are you trying to build an accretion/dilution model for? This will affect and determine the degree of granularity you'll want to go into. You can make a rough calculation of the annual turnover rate of stocks by calculating the institutional investors holding of that stock. Institutional investors are the only firms that are required to provide such data. The good this is they usually make the lion share of trading activity. On the other hand, this task might proof arduous   A different ratio that could be used as a substitute Share Turnover which is calculated as:  Share Turnover gives the number of shares traded as a fraction of the number of shares outstanding. For example, if you compare the results of stock turnover for three companies and the results came as follows:  Company A-share turnover: 1.5 Times Company B share turnover: 3 times Company C share turnover: 0.3 times From the results, we can conclude that for a particular period, company C had the least activity and the number of shares traded for that period was only a small fraction of the shares outstanding while other traders of company C hold most shares and never trade them. If you make a cross sectional analysis of a list of businesses you intend to invest in, you could figure which one has the least number of rapidity in the shares traded. A mutual fund has several classes of shares that are charged different fees. Some shares are sold through brokers and carry a sales charge (called load) that compensates the broker in lieu of a fee that the broker would charge the client for the service.  Vanguard does not have sales charge on its funds and you don't need to go through a broker to buy its shares; you can buy directly from them.  Admiral shares of Vanguard funds are charged lower annual expenses than regular shares (yes, all mutual funds charge expenses for fund adninistration that reduce the return that you get, and Vanguard has some of the lowest expense ratios) but Admiral shares are available only for large investments, typically $50K or so.  If you have invested in a Vanguard mutual fund, your shares can be set to automatically convert to Admiral shares when the investment reaches the right level. A mutual fund manager can buy and sell stocks to achieve the objectives of the fund, so what stockes you are invested in as a share holder in a mutual fund will typically be unknown to you on a day-to-day basis.  On the other hand, Exchange-traded funds (ETFs) are fixed baskets of stocks, and you can buy shares in the ETF.  These shares are bought and sold through a broker (so you pay a transaction fee each time) but expenses are lower since there is no manager to buy and sell stocks: the basket is fixed. Many ETFs follow specific market indexes (e.g. S&P 500).  Another difference between ETFs and mutual funds is that you can buy and sell ETFs at any time of the day just as if you could if you held stocks. With mutual funds, any buy and sell requests  made during the day are processed at the end of the day and the value of the shares that you buy or sell is determined by the closing price of the stocks held by the mutual fund.  With ETFs, you are getting the intra-day price at the time the buy or sell order is executed by your broker. authorized 100,000,000 shares They cannot issue shares more than that so 102M isn't possible. Common stock - $.01 par value, authorized 100,000,000 shares, issued 51,970,721 and 51,575,743 shares     If you look at the right 2 columns it become clear what it means. You missed the $ symbol and on the top (In thousands, except share amounts) ouststanding share 51,970,721 -> 520 On Sept 30, 2014 outstanding shares * 0.01 and rounded off to arrive at 520. ouststanding share 51,575,743 -> 516 On June 30, 2014 outstanding shares * 0.01 and rounded off to arrive at 516. I have been asking myself a similar question about the financial statements of Weyerhaeuser. In response to Dheer's comment, whilst treasury shares are treated as a negative, it is issued shares less treasury shares (the negative) which gives the outstanding shares. So the original query remains unanswered. I've searched several sources and all state that outstanding shares will never be greater than issued shares.  I've realized that the shares referred to are those authorized followed by those issued and outstanding (current year and prior year respectively) i.e. the shares that are both issued and outstanding as they must be issued in order to be outstanding This is supported in the example of Weyerhaeuser as there was a large increase in shares during Q1 2016 as a result of their merger with Plum Creek. Shares issued and outstanding are 510 million and 759 million respectively. 1) Explicitly, how a company's share price in the secondary market affects the company's operations. (Simply: How does it matter to a company that its share price drops?) I have a vague idea of the answer, but I'd like to see someone cover it in detail.  2) Negative yield curves, or bonds/bills with negative yields  Thanks! "There is no unique identifier that exists to identify specific shares of a stock. Just like money in the bank, there is no real reason to identify which exact dollar bills belong to me or you, so long as there is a record that I own X bills and I can access them when I want. (Of course, unlike banks, there is still a 1:1 relationship between the amount I should own and the amount they actually hold). If I may reach a bit, the question that I assume you are asking is how are shared actually tracked, transferred, and recorded so that I know for certain that I traded you 20 Microsoft shares yesterday and they are now officially yours, given that it's all digital. While you can technically try and request a physical share certificate, it's very cumbersome to handle and transfer in that form.  Ownership of shares themselves are tracked for brokerage firms (in the case of retail trading, which I assume is the context of this question as we're discussion personal finance). Your broker has a record of how many shares of X, Y, and Z you own, when you bought each share and for how much, and while you are the beneficial owner of record (you get dividends, voting rights, etc.) your brokerage is the one who is ""holding"" the shares. When you buy or sell a stock and you are matched with a counterparty (the process of which is beyond the scope of this question) then a process of settlement comes into play. In the US, settlement takes 3 working days to process, and technically ownership does not transfer until the 3rd day after the trade is made, though things like margin accounts will allow you to effectively act as if you own the shares immediately after a buy/sell order is filled. Settlement in the US is done by a sole source, the Depository Trust & Clearing Corporation (DTCC). This is where retail and institutional trade all go to be sorted, checked and confirmed, and ultimately returned to the safekeeping of their new owners' representatives (your brokerage). Interestingly, the DTCC is also the central custodian for shares both physical and virtual, and that is where the shares of stock ultimately reside." "In an IPO the seller is the Company selling new shares. Some of the IPOs also include something called ""secondary"" sales which are existing holders selling at the same time at the IPO price.  But that is a but more unusual.  And as someone noted, the $68 is the price paid for the people who bought at the IPO (the aggregate group usually called the syndicate). The $85 is the price that it is trading at once there is trading in the open market.  People that are able to get into the syndicate to buy the stock at $68 sometimes quickly sell if the price is much higher when trading starts. This is called ""flipping"" the stock.  Hedge funds do this much more often than institutional buyers like Fidelity."