Why do stocks tend to trade at high volumes at the end of (or start) the trading day?
"Trading at the start of a session is by far higher than at any other time of the day. This is mostly due to markets incorporating news into the prices of stocks. In other words, there are a lot of factors that can affect a stock, 24 hours a day, but the market trades for only 6.5 hours a day. So, a lot of news accumulates during the time when people cannot trade on that news. Then when markets finally open, people are able to finally trade on that news, and there is a lot of ""price discovery"" going on between market participants. In the last minutes of trading, volumes increase as well. This can often be attributed to certain kinds of traders closing out their position before the end of the day. For example, if you don't want to take the risk a large price movement at the start of the next day affecting you, you would need to completely close your position." Trading at the start of the day is highest because of news flows that may have come after the close of the previous day.  And trading at the end of the day is highest because of expected news flows after closing hours. Moreover, there are many day traders who buy in the morning without making any payment for purchase and such traders have to sell by evening or else they will have to make the payment for the purchases which they have made. Is it possible that mutual funds account for a significant portion of this volume. Investors may decide to buy or sell anytime within a 24 hour period, but the transaction only happened at the close of the market. Therefore at 3:59 pm the mutual fund knows if they will be buying or selling stocks that day.  As nws pointed out the non-market hours are longer and therefore accumulate more news event. Some financial news is specifically given during the time the market is closed. Therefore the reaction to that news has to either be in the morning when the market opens or in the late afternoon if they are trying to anticipate the news.  Also in the US market the early morning trader may be reacting to European market activities. Trading volumes are higher at the end of the day as many traders close their open positions. In the morning however, traders incorporate various factors like performance of worldwide markets overnight, any corporate or government announcements, global macro events, etc. The shift to trading at the close began in 2008. Traders did not want to be caught off guard by surprise news and there was a lot of volatility during the financial crisis, so they would close their position in the evening. Thats how it began. There are two reasons why it sticks around. First, there has been an increase usage of index funds or passive funds. These funds tend to update their positions at the end of the day. From the WSJ: Another factor behind the shift has been the proliferation of passively managed investments, such as index funds. These funds aim to mimic an index, like the S&P 500, by owning the shares that comprise it. Index funds don’t trade as often as active investors, but when they do, it is typically near the market close, traders say. That is because buying or selling a stock at its closing price better aligns their performance with the index they are trying to emulate. The second reason is simply that volume attracts volume. As a result of whats mentioned above, you have a shift to end of day trading, and the corrolary to that is that there is a liquidity shortage from 10am to 3pm. Thus, if you want to buy or sell a stock, but there are few buyers or sellers around, you will significant move the price when you enter your order. Obviously this does not affect retail traders, but imagine hedge funds entering or closing a billion dollar position. It can make a huge impact on price. And one way to mitigate that is to wait until there are more market participants to take the other end of your trade, just as at the end of the day. So this is a self-reinforcing trend that has begun in the markets and will likely stick around. http://www.wsj.com/articles/traders-pile-in-at-the-close-1432768080
"A ""market maker"" is someone that is contractually bound, by the exchange, to provide both bid and ask prices for a given volume (e.g. 5000 shares). A single market maker usually covers many stocks, and a single stock is usually covered by many market makers. The NYSE has ""specialists"" that are market makers that also performed a few other roles in the management of trading for a stock, and usually a single issue on the NYSE is covered by only one market maker.  Market makers are often middlemen between brokers (ignoring stuff like dark pools, and the fact that brokers will often trade stocks internally among their own clients before going to the exchange).  Historically, the market makers gave up buy/sell discretion in exchange for being the ""go-to guys"" for anyone wanting to trade in that stock. When you told your broker to buy a stock for you, he didn't hook you up with another retail investor; he went to the market maker. Market makers would also sometimes find investors willing to step in when more liquidity was needed for a security. They were like other floor traders; they hung out on the exchange floors and interacted with traders to buy and sell stocks. Traders came to them when they wanted to buy one of the specialist's issues. There was no public order book; just ticker tape and a quote. It was up to the market maker to maintain that order book.  Since they are effectively forbidden from being one-sided traders in a security, their profit comes from the bid-ask spread. Being the counter-party to almost every trade, they'd make profit from always selling above where they were buying. (Except when the price moved quickly -- the downside to this arrangement.) ""The spread goes to the market maker"" is just stating that the profit implicit in the spread gets consumed by the market maker. With the switch to ECNs, the role of the market maker has changed. For example, ForEx trading firms tend to act as market makers to their customers. On ECNs, the invisible, anonymous guy at the other end of most trades is often a market maker, still performing his traditional role. Yet brokers can interact directly with each other now, rather than relying on the market maker's book. With modern online investing and public order books, retail investors might even be trading directly with each other. Market makers are still out there; in part, they perform a service sold by an Exchange to the companies that choose to be listed on that exchange. That service has changed to helping tamp volatility during normal high-volatility periods (such as at open and close)." Prop (proprietary) traders trade using huge amounts of a bank's money (i.e. other people's money) so the reason why they have such low commissions (and they certainly do) is that the firms for which they work negotiate low commissions as the quantities and volumes (as they also trade very frequently) will be high and so the total commission will be very high. There is no such thing as a prop trading account unless you are a big bank with a very large bank roll (tens of millions of USD) so you cannot open one to enjoy those benefits unless you have enough money that you can negotiate your commission with brokers. 25k CAD is definitely not enough money to even start a conversation about those sorts of commissions. note: prop traders are generally banned from trading intraday with their own money by their employers and the law as it is a massive conflict of interests. Those who do and get caught face lengthy prison sentences. Options are a derivative product, and in this case, derive their value from an underlying security, a traded stock. An option gives you the right, but not the obligation, to buy a stock at a given price (the strike price) by a given time (the expiration date.) What I just described is a call option. The opposite instrument is a put, giving you the right, but not the obligation, to sell the stock at a given price.  Volumes have been written on the subject, but I'd suggest that for a custodial Roth, I'd not activate the ability to trade options.  How to get started with options investing? offers a nice introduction to trading options. In my response, I offer an example of a trade that's actually less risky due to the option component. "There are two umbrellas in investing: active management and passive management. Passive management is based on the idea ""you can't beat the market."" Passive investors believe in the efficient markets hypothesis: ""the market interprets all information about an asset, so price is equal to underlying value"". Another idea in this field is that there's a minimum risk associated with any given return. You can't increase your expected return without assuming more risk. To see it graphically:   As expected return goes up, so does risk. If we stat with a portfolio of 100 bonds, then remove 30 bonds and add 30 stocks, we'll have a portfolio that's 70% bonds/30% stocks. Turns out that this makes expected return increase and lower risk because of diversification. Markowitz showed that you could reduce the overall portfolio risk by adding a riskier, but uncorrelated, asset! Basically, if your entire portfolio is US stocks, then you'll lose money whenever US stocks fall. But, if you have half US stocks, quarter US bonds, and quarter European stocks, then even if the US market tanks, half your portfolio will be unaffected (theoretically). Adding different types of uncorrelated assets can reduce risk and increase returns.  Let's tie this all together. We should get a variety of stocks to reduce our risk, and we can't beat the market by security selection. Ideally, we ought to buy nearly every stock in the market so that  So what's our solution? Why, the exchange traded fund (ETF) of course! An ETF is basically a bunch of stocks that trade as a single ticker symbol. For example, consider the SPDR S&P 500 (SPY). You can purchase a unit of ""SPY"" and it will move up/down proportional to the S&P 500. This gives us diversification among stocks, to prevent any significant downside while limiting our upside. How do we diversify across asset classes? Luckily, we can purchase ETF's for almost anything: Gold ETF's (commodities), US bond ETF's (domestic bonds), International stock ETFs, Intl. bonds ETFs, etc. So, we can buy ETF's to give us exposure to various asset classes, thus diversifying among asset classes and within each asset class. Determining what % of our portfolio to put in any given asset class is known as asset allocation and some people say up to 90% of portfolio returns can be determined by asset allocation.  That pretty much sums up passive management. The idea is to buy ETFs across asset classes and just leave them. You can readjust your portfolio holdings periodically, but otherwise there is no rapid trading. Now the other umbrella is active management. The unifying idea is that you can generate superior returns by stock selection. Active investors reject the idea of efficient markets.  A classic and time proven strategy is value investing. After the collapse of 07/08, bank stocks greatly fell, but all the other stocks fell with them. Some stocks worth $100 were selling for $50. Value investors quickly snapped up these stocks because they had a margin of safety. Even if the stock didn't go back to 100, it could go up to $80 or $90 eventually, and investors profit. The main ideas in value investing are: have a big margin of safety, look at a company's fundamentals (earnings, book value, etc), and see if it promises adequate return. Coke has tremendous earnings and it's a great company, but it's so large that you're never going to make 20% profits on it annually, because it just can't grow that fast. Another field of active investing is technical analysis. As opposed to the ""fundamental analysis"" of value investing, technical analysis involves looking at charts for patterns, and looking at stock history to determine future paths. Things like resistance points and trend lines also play a role. Technical analysts believe that stocks are just ticker symbols and that you can use guidelines to predict where they're headed.  Another type of active investing is day trading. This basically involves buying and selling stocks every hour or every minute or just at a rapid pace. Day traders don't hold onto investments for very long, and are always trying to predict the market in the short term and take advantage of it. Many individual investors are also day traders.  The other question is, how do you choose a strategy? The short answer is: pick whatever works for you. The long answer is: Day trading and technical analysis is a lot of luck. If there are consistent systems for trading , then people are keeping them secret, because there is no book that you can read and become a consistent trader. High frequency trading (HFT) is an area where people basically mint money, but it s more technology and less actual investing, and would not be categorized as day trading.  Benjamin Graham once said: In the short run, the market is a voting machine but in the long run it is a weighing machine. Value investing will work because there's evidence for it throughout history, but you need a certain temperament for it and most people don't have that. Furthermore, it takes a lot of time to adequately study stocks, and people with day jobs can't devote that kind of time. So there you have it. This is my opinion and by no means definitive, but I hope you have a starting point to continue your study. I included the theory in the beginning because there are too many monkeys on CNBC and the news who just don't understand fundamental economics and finance, and there's no sense in applying a theory until you can understand why it works and when it doesn't." Investopedia defines it in the following way: It's essentially a market order that doesn't get entered until the last minute (or thereabouts) of trading. With this type of order you are not necessarily guaranteed the closing price but usually something very similar, depending on the liquidity in the market and bid-ask for the security in question. Traders who believe that a security or market will move more heavily during the last few minutes of trading will often place such an order in the hopes of having their order filled at a more desirable price. "Both explanations are partly true. There are many investors who do not want to sell an asset at a loss.  This causes ""resistance"" at prices where large amounts of the asset were previously traded by such investors.  It also explains why a ""break-through"" of such a ""resistance"" is often associated with a substantial ""move"" in price. There are also many investors who have ""stop-loss"" or ""trailing stop-loss"" ""limit orders"" in effect.  These investors will automatically sell out of a long position (or buy out of a short position) if the price drops (or rises) by a certain percentage (typically 8% - 10%). There are periods of time when money is flowing into an asset or asset class.  This could be due to a large investor trying to quietly purchase the asset in a way that avoids raising the price earlier than necessary.  Or perhaps a large investor is dollar-cost-averaging.  Or perhaps a legal mandate for a category of investors has changed, and they need to rebalance their portfolios.  This rebalancing is likely to take place over time.  Or perhaps there is a fad where many small investors (at various times) decide to increase (or decrease) their stake in an asset class.  Or perhaps (for demographic reasons) the number of investors in a particular situation is increasing, so there are more investors who want to make particular investments.  All of these phenomena can be summarized by the word ""momentum"". Traders who use technical analysis (including most day traders and algorithmic speculators) are aware of these phenomena.  They are therefore more likely to purchase (or sell, or short) an asset shortly after one of their ""buy signals"" or ""sell signals"" is triggered.  This reinforces the phenomena. There are also poorly-understood long-term cycles that affect business fundamentals and/or the politics that constrain business activity.  For example: Note that even if the markets really were a random walk, it would still be profitable (and risk-reducing) to perform dollar-cost-averaging when buying into a position, and also perform averaging when selling out of a position.  But this means that recent investor behavior can be used to predict the near-future behavior of investors, which justifies technical analysis." No, it is just normal sideways action.  Think of this week kind of like October 14th - October 20th. It is a day traders week. If you're not day trading then either do after hours trading at the second of the news, or buy/sell on thursday (i'm bullish).  This is normal market activity. I wouldn't consider it out of the ordinary. When there is sideways action there is always good times to both buy and sell, if you realize it. For example, today is the perfect day to buy ... maybe when $SPX is 1240-1244. "Stock price is set to the price with the highest transaction volume at any given time.  The stock price you cited was only valid in the last transaction on a specific stock exchange. As such it is more of an ""historic"" value. Next trade will be done with the next biggest volume. Depending on the incoming bids and asks this could be higher or lower, but you can assume it will not be too far off if there is no crash underway. Simple example stock exchange:"