If I have 10,000 stocks to sell with 23 B market cap
"You will almost certainly be able to sell 10,000 shares at once. The question is a matter of price. If you sell ""at market"" then you may get a lower price for each ""batch"" of the stock sold (one person buys 50, another buys 200, another buys 1000 etc) at varying prices. Will you be able to execute a single order to sell them all at the same price at the same time? Nobody can say, and it's not really a function of the company size. The exchange has what's called ""open interest"" which roughly correlates to how many people have active orders in at a given price. This number is constantly changing alongside the bid and ask (particularly for active stocks). So let's say you have 10,000 shares and you want to sell them for $100 each. What you need is at least 10,000 in open interest at $100 bid to execute. By contrast let's say you issue a limit order at $100 for 10,000 shares. Your ask will stay outstanding at that price and you'll be filled at that price if there are enough buyers. I you have a limit sell order at $100 for 10,000 shares the strike price of the stock cannot go to $100.01 until all of your sell orders are filled." "First a quick terminology correction: I believe you're proposing selling 10,000 shares of the stock of a company, not ""10,000 stocks"". When you sell, you need to decide whether you're selling for a specific minimum price or just selling for whatever price you can get. If you set a specific lower limit on asking price, then if people aren't interested at that price it doesn't sell. Which may mean you sell only a few shares, or none if your asking price isn't considered reasonable. If you want to sell independent of price, then as you begin to flood the market with your shares, the price you get per additional share may decline until it finds a buyer. What that lower limit is will depend on what people think the stock is currently worth. This is one of the many complications I don't want to deal with, which is why I stick with index funds."
If you can afford the cost and risk of 100 shares of stock, then just sell a put option.  If you can only afford a few shares, you can still use the information the options market is trying to give you -- see below. A standing limit order to buy a stock is essentially a synthetic short put option position. [1]  So deciding on a stock limit order price is the same as valuing an option on that stock. Options (and standing limit orders) are hard to value, and the generally accepted math for doing so -- the Black-Scholes-Merton framework -- is also generally accepted to be wrong, because of black swans. So rather than calculate a stock buy limit price yourself, it's simpler to just sell a put at the put's own midpoint price, accepting the market's best estimate. Options market makers' whole job (and the purpose of the open market) is price discovery, so it's easier to let them fight it out over what price options should really be trading at. The result of that fight is valuable information -- use it. Sell a 1-month ATM put option every month until you get exercised, after which time you'll own 100 shares of stock, purchased at: This will typically give you a much better cost basis (several dollars better) versus buying the stock at spot, and it offloads the valuation math onto the options market.  Meanwhile you get to keep the cash from the options premiums as well. Disclaimer: Markets do make mistakes.  You will lose money when the stock drops more than the option market's own estimate. If you can't afford 100 shares, or for some reason still want to be in the business of creating synthetic options from pure stock limit orders, then you could maybe play around with setting your stock purchase bid price to (approximately): See your statistics book for how to set ndev -- 1 standard deviation gives you a 30% chance of a fill, 2 gives you a 5% chance, etc. Disclaimer: The above math probably has mistakes; do your own work.  It's somewhat invalid anyway, because stock prices don't follow a normal curve, so standard deviations don't really mean a whole lot.  This is where market makers earn their keep (or not). If you still want to create synthetic options using stock limit orders, you might be able to get the options market to do more of the math for you. Try setting your stock limit order bid equal to something like this: Where put_strike is the strike price of a put option for the equity you're trading.  Which option expiration and strike you use for put_strike depends on your desired time horizon and desired fill probability.  To get probability, you can look at the delta for a given option.  The relationship between option delta and equity limit order probability of fill is approximately: Disclaimer: There may be math errors here.  Again, do your own work. Also, while this method assumes option markets provide good estimates, see above disclaimer about the markets making mistakes. Firstly 795 is not even. Secondly - generally you would pay tax on the sale of the 122 shares, whether you buy them back or not, even one minute later, has nothing to do with it. The only reason this would not create a capital gains event is if your country (which you haven't specified) has some odd rules or laws about this that I, and most others, have never heard of before. "I reread your question. You are not asking about the validity of selling a particular stock after a bit of an increase but a group of stocks. We don't know how many.  This is the S&P for the past 12 months. Trading at 1025-1200 or so means that 80-100 points is an 8% move. I count 4 such moves during this time.  The philosophy of ""you can't go wrong taking a gain"" is tough for me to grasp as it offers no advice on when to get (back) in. Studies by firms such as Dalbar (you can google for some of their public material) show data that supports the fact that average investors lag the market by a huge amount. 20 years ending 12/31/08 the S&P returned 8.35%, investor equity returns showed 1.87%. I can only conclude that this is a result of buying high and selling low, not staying the course.  The data also leads me to believe the best advice one can give to people we meet in these circumstances is to invest in index funds, keeping your expenses low as you can. I've said this since read Jack Bogle decades ago, and this advice would have yielded about 8.25% over the 20 years, beating the average investor by far, by guaranteeing lagging the average by 10 basis points or so.  A summary of the more extensive report citing the numbers I referenced is available for down load - QAIB 2015 - Quantitative Analysis of Investor Behavior. It's quite an eye-opener and a worthy read. (The original report was dated 2009, but the link broke, so I've updated to the latest report, 2015)" So in your screenshot, someone or some group of someones is willing to buy 3,000 shares at $3.45, and someone or some group of someones is willing to sell 2,000 shares at 3.88. Without getting in to the specific mechanics, you can place a market buy order for 10 (or whatever number) shares and it will probably transact at $3.88 per share because that's the lowest price for which someone will currently sell their shares. As a small fish, you can generally ignore the volume notations in the bid/ask quotes. There isn't a formula like that, there is only the greed of other market participants, and you can try to predict how greedy those participants will be. If someone decided to place a sell order of 100,000 shares at $5, then you can buy an additional 100,000 shares at $5. In reality, people can infer that they might be the only ones trying to sell 100,000 shares right then, and raise the price so that they make more money. They will raise their sell order to $5.01, $5.02 or as high as they want, until people stop trying to buy their shares. It is just a non-stop auction, just like on ebay. There is no ideal number of stocks you should own. There are several factors you should consider though. First, how actively do you want to manage your portfolio. If you want to be very active then the number of stocks you own should be based on the amount of time you have to research the company, by reading SEC filings and listening to conference calls, so you are not surprised when the company reports every quarter. If you don't want to be very active, then you are better off buying solid companies that have a good reputation and good history of performance.  Second, you should decide how much risk you are willing to take. If you have $10,000 that you can afford to lose, then you can put your money into more risky stocks or into fewer stocks, which could potentially have a higher return. If you want your $10,000 grow (or lose) with the market, better off, again, going with the good rep and history stocks or a variety of stocks.  Third, this goes along with your risk to some extent, but you should consider if you are looking for short term or long term gains? If you are looking to put your money in the market for the short term, you will probably be looking at fewer stocks with more money in each. If you are looking for long term, you will be around 5 stocks that you swap as they reach goals you set out for each stock.  In my opinion, and I am not a financial expert, I like to stay at around 5 companies, mostly for the fact that it is about the ideal number of companies to keep track of. In order to see whether you can buy or sell some given quantity of a stock at the current bid price, you need a counterparty (a buyer) who is willing to buy the number of stocks you are wishing to offload. To see whether such a counterparty exists, you can look at the stock's order book, or level two feed. The order book shows all the people who have placed buy or sell orders, the price they are willing to pay, and the quantity they demand at that price. Here is the order book from earlier this morning for the British pharmaceutical company, GlaxoSmithKline PLC.  Let's start by looking at the left-hand blue part of the book, beneath the yellow strip. This is called the Buy side. The book is sorted with the highest price at the top, because this is the best price that a seller can presently obtain. If several buyers bid at the same price, then the oldest entry on the book takes precedence. You can see we have five buyers each willing to pay 1543.0 p (that's 1543 British pence, or £15.43) per share. Therefore the current bid price for this instrument is 1543.0. The first buyer wants 175 shares, the next, 300, and so on. The total volume that is demanded at 1543.0p is 2435 shares. This information is summarized on the yellow strip: 5 buyers, total volume of 2435, at 1543.0. These are all buyers who want to buy right now and the exchange will make the trade happen immediately if you put in a sell order for 1543.0 p or less. If you want to sell 2435 shares or fewer, you are good to go. The important thing to note is that once you sell these bidders a total of 2435 shares, then their orders are fulfilled and they will be removed from the order book. At this point, the next bidder is promoted up the book; but his price is 1542.5, 0.5 p lower than before. Absent any further changes to the order book, the bid price will decrease to 1542.5 p. This makes sense because you are selling a lot of shares so you'd expect the market price to be depressed. This information will be disseminated to the level one feed and the level one graph of the stock price will be updated. Thus if you have more than 2435 shares to sell, you cannot expect to execute your order at the bid price in one go. Of course, the more shares you are trying to get rid of, the further down the buy side you will have to go. In reality for a highly liquid stock as this, the order book receives many amendments per second and it is unlikely that your trade would make much difference. On the right hand side of the display you can see the recent trades: these are the times the trades were done (or notified to the exchange), the price of the trade, the volume and the trade type (AT means automatic trade).  GlaxoSmithKline is a highly liquid stock with many willing buyers and sellers. But some stocks are less liquid. In order to enable traders to find a counterparty at short notice, exchanges often require less liquid stocks to have market makers. A market maker places buy and sell orders simultaneously, with a spread between the two prices so that they can profit from each transaction. For instance Diurnal Group PLC has had no trades today and no quotes. It has a more complicated order book, enabling both ordinary buyers and sellers to list if they wish, but market makers are separated out at the top. Here you can see that three market makers are providing liquidity on this stock, Peel Hunt (PEEL), Numis (NUMS) and Winterflood (WINS). They have a very unpalatable spread of over 5% between their bid and offer prices. Further in each case the sum total that they are willing to trade is 3000 shares. If you have more than three thousand Dirunal Group shares to sell, you would have to wait for the market makers to come back with a new quote after you'd sold the first 3000. 10% is way high unless you really dedicate time to managing your investments. Commodities should be a part of the speculative/aggressive portion of your portfolio, and you should be prepared to lose most or all of that portion of your portfolio. Metals aren't unique enough to justify a specific allocation -- they tend to perform well in a bad economic climate, and should be evaluated periodically. The fallacy in the arguments of gold/silver advocates is that metals have some sort of intrinsic value that protects you. I'm 32, and remember when silver was $3/oz, so I don't know how valid that assertion is. (Also recall the 25% price drop when the CBOE changed silver's margin requirements.) You are right: if the combined value of all outstanding GOOG shares was $495B, and the combined value of all GOOGL shares was $495B, then yes, Alphabet would have a market cap of at least $990B (where I say at least only because I myself don't know that there aren't other issues that should be in the count as well). The respective values of the total outstanding GOOG and GOOGL shares are significantly less than that at present though. Using numbers I just grabbed for those tickers from Google Finance (of course), they currently stand thus: If you bought 5 shares @ $20 each that would cost you $100 plus brokerage. Even if your brokerage was only $10 in and out, your shares would have to go up 20% just for you to break even. You don't make a profit until you sell, so just for you to break even your shares need to go up to $24 per share. Because your share holding would be so small the brokerage, even the cheapest around, would end up being a large percentage cost of any overall profits. If instead you had bought 500 shares at $20, being $1000, the $20 brokerage (in and out) only represents 2% instead of 20%. This is called economies of scale. "Your math is correct. These kind of returns are possible in the capital markets. (By the way, Google Finance shows something completely different for $CANV than my trading console in ThinkorSwim, ToS shows a high of $201, but I believe there may have been some reverse splits that are not accurately reflected in either of these charts) The problems with this strategy are liquidity and timing. Let's talk about liquidity, because that is a greater factor here than the random psychological factors that would have affected you LONG LONG before your $1,000 allowance was worth a million dollars. If you bought $1000 worth of this stock at $.05 share, this would have been 20,000 shares. The week of October 11th, 2011, during the ENTIRE WEEK only 5,000 shares were traded. From this alone, you can see that it would have been impossible for you to even acquire 20,000 shares, for yourself at $.05 because there was nobody to sell them to you. We can't even look at the next week, because there WERE NO TRADES WHATSOEVER, so we have to skip all the way to November 11th, where indeed over 30,000 shares were traded. But this pushed the price all the way up to $2.00, again, there was no way you could have gotten 20,000 shares at $.05 So now, lets talk about liquidation of your shares. After several other highs and lows in the $20s and $30s, are you telling me that after holding this stock for 2 years you WOULDN'T have taken a $500,000 profit at $25.00 ? We are talking about someone that is investing with $1,000 here. I have my doubts that there was no time between October 2011 and January 2014 that you didn't think ""hm this extra $100,000 would be really useful right now.. sell!"" Lets say you actually held your $1,000 to $85.55 there were EXACTLY TWO DAYS where that was the top of the market, and in those two days the volume was ~24,000 shares one day and ~11,000 shares the next day. This is BARELY enough time for you to sell your shares, because you would have been the majority of the volume, most likely QUADRUPLING the sell side quotes. As soon as the market saw your sell order there would be a massive selloff of people trying to sell before you do, because they could barely get their shares filled (not enough buyers) let alone someone with five times the amount of shares that day. Yes, you could have made a lot of money. Doing that simplistic math does not tell you the whole story." The next day the market opens trading at 10.50, You haven't specified whether you limit order for $10.10 is to buy or sell. When the trading opens next day, it follows the same process of matching the orders. So if you have put a limit order to buy at $10.10 and there is no sell order at that price, your trade will not go through. If you have placed a limit sell order at $10.10 and there is a buyer at or higher price, it would go through. The Open price is the price of the first trade of the day. If you have $10000 and wish to buy 1000 shares of a $10 stock, you risk borrowing on margin if you go over a bit. For some people, that's a non-issue. Some folk with an account worth say, $250K don't mind going over now and then or even let the margin account run $100K on a regular basis.  But your question is about market orders. A limit order above the market price will fast-fill at the market anyway. When I buy a stock, it's longer term usually. A dime on a $30 share price won't affect my buy decision, so market is ok for me. "I think for this a picture is worth a thousand words.  This is a ""depth chart"" that I pulled from google images, specifically because it doesn't name any security.  On the left you have all of the ""bids"" to buy this security, on the right you have the ""asks"" to sell the security.  In the middle you have the bid/ask spread, this is the space between the highest bid and the lowest ask.  As you can see you are free to place you order to the market to buy for 232, and someone else is free to place their order to the market to sell for 234.  When the bid and the ask match there's a transaction for the maximum number of available shares.  Alternatively, someone can place a market order to buy or sell and they'll just take the current market price. Retail investors don't really get access to this kind of chart from their brokers because for the most part the information isn't terribly relevant at the retail level." "Here's a dump from what I use. Some are a bit more expensive than those that you posted. The second column is the expense ratio. The third column is the category I've assigned in my spreadsheet -- it's how I manage my rebalancing among different classes. ""US-LC"" is large cap, MC is mid cap, SC is small cap. ""Intl-Dev"" is international stocks from developed economies, ""Emer"" is emerging economies. These have some overlap. I don't have a specific way to handle this, I just keep an eye on the overall picture. (E.g. I don't overdo it on, say, BRIC + Brazil or SPY + S&P500 Growth.) The main reason for each selection is that they provide exposure to a certain batch of securities that I was looking for. In each type, I was also aiming for cheap and/or liquid like you. If there are substitutes I should be looking at for any of these that are cheaper and/or more liquid, a comment would be great. High Volume: Mid Volume (<1mil shares/day): Low Volume (<50k shares/day): These provide enough variety to cover the target allocation below. That allocation is just for retirement accounts; I don't consider any other savings when I rebalance against this allocation. When it's time to rebalance (i.e. a couple of times a year when I realize that I haven't done it in several months), I update quotes, look at the percentages assigned to each category, and if anything is off the target by more than 1% point I will buy/sell to adjust. (I.e. if US-LC is 23%, I sell enough to get back to 20%, then use the cash to buy more of something else that is under the target. But if US-MC is 7.2% I don't worry about it.) The 1% threshold prevents unnecessary trading costs; sometimes if everything is just over 1% off I'll let it slide. I generally try to stay away from timing, but I do use some of that extra cash when there's a panic (after Jan-Feb '09 I had very little cash in the retirement accounts). I don't have the source for this allocation any more, but it is the result of combining a half dozen or so sample allocations that I saw and tailoring it for my goals."