When to use a stop limit order over a stop order
I would be using stop limit orders for stocks that are not too volatile. If you look at the chart and there are not many gaps especially after peaks, then you have more chance of being filled at your specified stop loss level using a stop limit order. If the stock is very volatile and has a large or many gaps down after most peak, then I would consider using a stop market order to make sure you do get out even if it is somewhat past your desired stop level. One think to consider is to avoid trading very volatile stocks that gap often. This is what I do, and using stop limit orders my stop level is achieved more than 95% of the time. This is to protect your position in specific highly volatile market conditions.  If the stock is free falling and you only have a stop order at $90, it's possible that this order could be filled at $50 or even less. The limit is to protect you from that, as there are certain very specific times where it's better to just hold the stock instead of taking a huge loss (ie when price is whipsawing).
I don't think user4358's explanation is correct.  A trailing LIT Sell Order adjusts downwards, i.e. if you place the order with an Aux price (in TWS it's trigger price) of 105.00 and a trailing amount of 6.00 then, assuming the ask is 100.00, TWS will add the trailing amount to the ask price and if it's less than the trigger price it will adjust. So in my example, if the market (ask) goes straight up to 105.00, nothing will be adjusted, the trigger is touched and the limit order will be placed (see below). If on the the other hand the market goes down to 99.00 then trlng amt + ask is 105.00, if it goes further down to 98.00 then the trigger price will be adjusted to 104.00 (because it's less than the current trigger), and so on. For the LIT part you have either an absolute limit price you can enter, or you have an offset limit which will be subtracted from the trigger price, in which case it is adjusted as well. So back to my example, the trigger is now 104.00 and the limit offset is say 1.00, so my limit order would be placed at 103.00 if the ask ever touches 104.00, and that in turn is only visible if the bid touches 103.00 (because it's limit-if-touched). For a buy just use the same explanation with some swapped roles, the trigger price adjust upwards when the trailing amount plus bid is larger than the current trigger, and the limit offset will be added to the trigger price. Edit Also quite succinct and worth having a look at: http://www.interactivebrokers.com/en/trading/orders/trailingLimitTouched.php Guesswork, highly subjective As for why this might be good, well, you have to believe in momentum strategies, i.e. a market that goes down, will continue to go down, if you believe that and you believe in mean reversion as well, then a trailing limit order can assist you in not buying/selling impulsively, but closer to the mean.  I've never used it that way though. What I have done, even just now to get the explanation right, is to place trailing buy and sell orders simultaneously.  You will find that you can just go in with coarse estimates and because the adjustments will go towards each other, you will end up with a narrowing band of trigger prices (as opposed to trailing stop orders which will give you a widening band of trigger prices).  If you believe in overshooting and equilibria then this can be one easy way to profit from it.  I've just sold EURUSD for 1.26420 and bought it back at 1.26380 with a trailing amount of 5pips and a limit offset of 2pips within the time of writing this. The only time I've bothered with stop orders is when I think the position is in a particularly volatile state and there is an earnings report pending.  In this situation it's an easily debatable thing to do.  If I'm so concerned that the earnings report will be enough to cause a wild downswing that I'd place a stop order, maybe I should just drop the position now.   I subscribe to the school of thought that you don't sell your MVPs.  I've bought a few things on a whim that really performed well over the few years to follow.  To me it doesn't make sense to pick a return at which I would turn off the spigot.  So generally it doesn't make sense to hold orders that would force a sale, either after some upside or downside occurs. Additionally, if I've chosen something as a long term hold.  I never spend all my cash opening up a position.  I've frequently opened positions that subsequently experienced a decline, when that happens I buy more. Meaningless side thought: With the election coming I've been seriously considering pulling some of my gains off the table.  My big apprehension with doing that is that I have no near-term alternative use for the money.  So what's the point of selling a position I'm otherwise comfortable with just to pay taxes on the gain then probably buy back in? What you have to remember is that Options are derivatives of another asset like stocks for example.  The price of the Option is derived from the price of the underlying. If the underlying is a stock for example, as the price of the stock moves up and down during the trading day, so will the Market Maker's fair value for the Option.  As Options are usually less liquid than the underlying stock, Market Makers are usually more active in 'Providing a Market' with Options. Thus if you place a limit order half way between the current Bid and Ask and the underlying stock price moves towards your limit order, the Market Maker will do their job and 'Provide a Market' at that price, thus executing your order. "I place a trade, a limit order on a thinly traded stock. I want to buy 1000 shares at $10. The current price is $10.50. Someone places a market order for 500 shares. Another trader has a limit order for $10.10 for 400 shares. His order fills, and I get 100 at my price. I wait another day to see if I get any more shares. This is just an example of how it can work. I can place my order as ""all or none"" if I wish to avoid this." If you plan to take profit at $1.00 then your profit will be $40. Then, if you set your stop at $0.88 then your loss if you get stopped will be $20.  So your Reward : Risk = 2:1.  Note, that this does not take into account brokerage in and out and any slippage from the price gapping past your stop loss. Do not use a stop loss order as a long-term investor.  The arguments in favor of stop losses being presented by a few users here rely on a faulty premise, namely, that there is some kind of formula that will let you set your stop such that it won't trigger on day-to-day fluctuations but will trigger in time to protect you from a significant loss in a serious market downturn.  No such formula exists.  No matter where you set your stop, it is as likely to dump you from your investment just before it begins climbing again as it is to shield you from continued losses.  Each time that happens, you will have sold low and bought high, incurring trading fees into the bargain.  It is very unlikely that the losses you avoid in a bear market (remember, you still incur the loss up until your stop is hit; it's only the losses after that that you avoid) will make up the costs of false alarms. On top of that, once you have stopped out of your first investment choice, then what?  Will you reinvest in some other stock or fund?  If those investments didn't look good to you when you first set up your asset allocation, then why should they look any better now, just because your primary investment has dropped by some arbitrary[*] amount?  Will you park the money in cash while you wait for prices to bottom out?  The market bottom is only apparent in retrospect.  There is no formula for calling it in real time. Perhaps stop loss orders have their uses in active trading strategies, or maybe they're just chrome that trading platforms use to attract customers.  Either way, using them on long-term investments will just cost you money in the long run.  Forget the fancy order types, and manage your risk through your asset allocation.  The overwhelming likelihood is that you will get better performance, and you will spend less time worrying about your investments to boot. [*] Why are the stop levels recommended by the formulae invariably multiples of 5%?  Do the market gods have a thing for round numbers? "One practical application would be to protect yourself from a ""flash crash"" type scenario where a stock suddenly plunges down to a penny due to transient market glitches. If you had a stop-loss order that executed at a penny (for a non-penny stock) it would be probably be voided by the exchange, but you might not want to take that risk." "When you place a limit sell order of $10.00 (for a stock on an option) you are adding your order to the book.  Anyone who places a buy at-the-market or with a limit price over $10.00 will have that order immediately fulfilled through the offer you have placed on the book. On the other hand, if that other person places a buy for $8.00, then the spread will now be ""$8.00 bid, $10.00 ask"". Priority is based on first the price (all $9.99 asks will clear before $10.00) and within each bucket this is based on the time your order was submitted. This is why in bidding markets (including eBay) buying at $x.01 is way better than $x.00 and selling at $x.99 is better than $(x+1).00. Source: https://en.wikipedia.org/wiki/Order_(exchange) under ""first-come-first-served""" When using the Stochastic Indicator your basic aim is to buy (go long) when the stochastic becomes oversold (goes below 20%) and then the %K line crosses above the %D line at a market low, and to sell (go short) when the stochastic becomes overbought (goes above 80%) and then the %K line crosses below the %D line at a market high. Other indicators or candlestick patters can also be used to further confirm the trade. Below is a chart of a trade I recently took on GUD.AX using the Slow Stochastic in combination with support and resistance levels as well as a candlestick pattern.  When I conducted my stock search on the evening of 28th July 2015, GUD was one of the results from the search that I particularly liked. The Slow Stochastic had just made a crossover in the oversold area just as the price was bouncing off its recent lows at the support line. But what I really like about this opportunity was that there was also a bullish reversal candle (a Hammer) at this short term market bottom. The high for the day was $8.34, so I placed a stop buy order to buy the stock tomorrow if the price opened or moved above this high of today. So I would only buy if the stock hit or moved above $8.35 during the next days trading. So if the stock opened and stayed below the previous day's high I would not buy the stock and my order would be canceled at the end of the day. This is very important because it stops you from getting into trades that don't go in the direction you want. If this happens then you could check the chart again after market close to see if it is still worthwhile to place a new order for the next day. On the 29th July 2015 the stock did open higher at $8.42 (which is where my order got executed) and closed at $8.46. So I ended up buying slightly above my target price but it did move higher on the day, so a successful entry overall. I had placed my initial stop loss at $8.09 (just below the low of the previous day of $8.10). If the trade had gone against me in the following days the most I would have lost was 1% of my total account capital. My target for this trade was $9.86 (just below the resistance line near $10), which would represent a 5% gain against my total account capital (or approx. 16.7% gain on the trade). So my win to loss ratio was 5:1. As you can see from the chart, the next day gapped up at the open and prices continued moving up strongly during the day. The next day was a slightly negative day, and then a few days later, on the 5th August 2015 my target price of $9.86 was reached (with a high of $9.88 for that day), so my order was closed for a total profit of 16.7% on the face value of the trade. However, as I bought on margin (using CFDs) my actual profit on the initial margin I had invested was 167%. My total time in the trade was 7 days, and I spent about an hour in the evening doing my searches and placing my orders, then less than 10 minutes managing the trade each evening after market close. The stock did go up a bit further after my profit target was reached, but the day after that the price started to fall as the price hit the resistance line and the Slow Stochastic did a crossover in the overbought area. Overall, this was a very ideal trade and I was very happy with it. Not all my trades reach my profit targets and I may get stopped out at a smaller profit or I might make a small loss (as I move my stops up as the price moves up). The key to successful trading over the long term is to keep you losses small and let your profits run (with my longer term trend trading I don't have profit targets and let my profits run until I get stopped out, but with my shorter term trading I do use a profit target usually 5 or 6 times the size of my initial stop). If you have an average win to average loss ratio of 3:1 or higher and have a success rate of 50% winners you will make money over the long term. Stop order is shorter term for stop-loss order.  The point being that is intended as a protective measure.  A buy stop order would be used to limit losses when an investor has sold a stock short.  (Meaning that they have borrowed stock and sold it, in hopes that they can take advantage of a decline in the stock's price by replacing the borrowed stock later at a cheaper price.  The idea is to limit losses due to a rising stock price.)  Meanwhile, a sell stop order would be used to limit losses on a stock that an investor actually owns, by selling it before the price declines further. The important thing to keep in mind about stop orders is that they turn into market orders when the stop price is reached.  This means that they will be filled at the best available price when the order is actually executed.  In fast moving markets, this can be a price that is quite different from the stop price. A limit order allows an investor to ensure that they do not buy/sell a stock at more/less than the specified amount. The thing to keep in mind is that a limit order is not guaranteed to execute. A stop-limit order is a combination of a stop-loss order and limit order, in that it becomes a limit order (instead of a market order) when the stop price is reached. Links to definitions: Stop order Stop-limit order Limit order Market order "This is called a Contingent Order and is set up so if one order is filled (in this case) the other order is cancelled.  It's a common desire that one would wish to have a stop-loss in place but also a targeted sell price for their in-the-money sell point.  Your broker will tell you all you need to know about how to enter this, if you explain you'd like to place a contingent order. (As Victor noted below, your specific order would be a ""One Cancels Other"" or ""OCO"") Great first question, welcome to Money,SE." Firstly what are you trading that you could lose more than you put in? If you are simply trading stocks you will not lose more than you put in, unless you are trading on margin. A limit order is basically that, a limit on the maximum price you want your buy order bought at or the minimum price you want your sell order sold at. If you can't be glued to the screen all day when you place a limit order, and the market moves the opposite way, you may miss out on your order being executed. Even if you can be in front of the screen all day, you then have to decide if you want to chase the market of miss out on your purchase or sale. For example, if a stock is trading at $10.10 and you put a limit buy order to buy 1000 shares at or below $10.00 and the price keeps moving up to $10.20, then $10.30 and then $10.50, until it closes the day at $11.00. You then have the choice during the day to miss out on buying the shares or to increase your limit order in order to buy at a higher price. Sometime if the stock is not very liquid, i.e. it does not trade very often and has low volume, the price may hit $10.00 and you may only have part of your order executed, say 500 out of your 1000 shares were bought. This may mean that you may have to increase the price of your remaining order or be happy with only buying 500 shares instead of 1000. The same can happen when you are selling (but in reverse obviously). With market order, however, you are placing a buy order to buy at the next bid price in the depth or a sell order to sell at the next offer price in the depth. See the market depth table below:  Note that this price depth table is taken before market open so it seems that the stock is somewhat illiquid with a large gap between the first and second prices in the buyers (bid) prices. When the market opened this gap is closed, as WBC is a major Australian bank and is quite liquid. (the table is for demonstration purposes only). If we pretend that the market was currently open and saw the current market depth for WBC as above, you could decide to place a limit sell order to sell 1000 shares at say $29.91. You would sell 100 shares straight away but your remaining 900 sell order will remain at the top of the Sellers list. If other Buyers come in at $29.91 you may get your whole sale completed, however, if no other Buyers place orders above $29.80 and other Sellers come into the market with sell orders below $29.91, your remaining order may never be executed. If instead you placed a market sell order you would immediately sell 100 shares at $29.91 and the remaining 900 shares at $29.80. (so you would be $99 or just over 0.3% worse off than if you were able to sell the full 1000 shares at $29.91). The question is how low would you have had to lower your limit order price if the price for WBC kept on falling and you had to sell that day? There are risks with whichever type of order you use. You need to determine what the purpose of your order is. Is it to get in or out of the market as soon as possible with the possibility of giving a little bit back to the market? Or is it to get the price you want no matter how long it takes you? That is you are willing to miss out on buying the shares (can miss out on a good buy if the price keeps rising for weeks or months or even years) or you are willing to miss out on selling them right now and can wait for the price to come back up to the price you were willing to sell at (where you may miss out on selling the shares at a good price and they keep on falling and you give back all your profits and more). Just before the onset of the GFC I sold some shares (which I had bought a few years earlier at $3.40) through a market order for $5.96. It had traded just above $6 a few days earlier, but if instead of a market order I had placed a limit order to sell at $6.00 or more I would have missed out on the sale. The price never went back up  to $6 or above, and the following week it started dropping very quickly. It is now trading at about $1.30 and has never gone back above $2.00 (5.5 years later). So to me placing a limit order in this case was very risky. If you are in it for the long run and are not worried about intra day fluctuations and buying within + or - 1% you would be better off going for a market order as this will make sure you buy it on the day.  If you use limit orders you risk missing out on the order if prices gap and start rising in the morning. Another option is to employ stop buy trigger orders (if offered by your broker). So you would have to sum up and decide which type of order would suit your strategy the best. Are you looking to buy the security because you are looking for long term growth and gains, or are you after getting the best price possible to help your short term gains? You would place a stop buy market order at 43.90 with a stop loss market order at 40.99 and a stop limit profit order at 49.99. This should all be entered when you place your initial buy stop order. The buy stop order will triger and be traded once the price reaches 43.90or above. At this point both the stop loss market order and the stop limit profit order will become active. If either of them is triggered and traded the other order will be cancelled automatically. The total limit book is a composite of all the orders on all of the exchanges. While it's uncommon for a limit order posted beyond the NBBO to fill outside of the NBBO, it does occur. For example, the best ask may be on exchange X, but for some reason the smart order routing algorithm may select exchange Y if it judges the net trade to be less costly, malfunctions, etc, and HFTs will immediately arbitrage the order between two exchanges, or the best order on exchange X disappears causing the order to fill above the NBBO. The system isn't perfect because there are multiple exchanges, but that eventuality is extremely rare with equities since nearly every exchange will have orders posted at the NBBO because exchange equity fee and rebate schedules are extremely competitive, nearly identical.  It is however more common with options since less exchanges as a percentage of the total will have orders posted at the NBBO because of very wide exchange rebate and fee schedules. How a single exchange handles a new order that crosses an existing limit order is already addressed here: How do exchanges match limit orders?