Single-Click Stock Pair Trading At Its Finest
It takes a lot of self-control not to develop a bunker mentality with the recent market gyrations. That's why I have been looking into pair trading. Pair trading is one of the more advanced trading techniques. You create offsetting positions in two different stocks, indices or futures, thereby capitalizing on the relative price changes between the two different positions. Sometimes, the difference between two stocks is more predictable than the direction of the individual stocks themselves. That is, no matter what the individual stocks are doing, a good pair might have the spread between them oscillate back and forth around a mean. When the spread gets too high, and you expect it to go back down, you can establish a short delta position in one index and a long delta position in the other index, and hopefully profit if the spread returns to its average off its high. For example, in TOS charts, type the symbol SPY-IWM in the symbol field. Then click on the "studies" button in the upper right hand corner; you can see I added a "spreads" study and a "correlations" study. We look for pairs that have an 80% correlation or higher. In this year-to-date (YTD) daily chart of SPY-IWM, the range is $70.53 - $36.05. The present price is around $42.00, and there is a nice correlation between the two ETFs of 83%.
A year to date (YTD) chart is good for a longer term approach, but I also look at shorter-term correlations. I want it to correspond to the approximate time of the trade. If I think that the spread will revert to its mean in one week, I might look at the five-day correlation. If I think the spread will revert in three months, I might look at the 90-day correlation. As you can see, the major difference between the two time frames is dramatic. You could make an argument that this pair trade is relatively low longer term on the YTD chart while you could also argue that it is approaching resistance on the short-term monthly chart if it hits its high of $45.97. Could it be long-term cheap and short-term expensive?
You can do pair trading with one click on the thinkorswim platform. Simply go to the "trade" tab and type in the two symbols with a minus sign in between. Click on the "ASK." In this example, you would be buying SPY and selling IWM with one click! SPY-IWM! Pair orders are much different from regular spread orders in the thinkorswim system, as both orders will be sent independently! If you choose to use limit orders, there is a chance you won't be filled on one or all of your order. This is one of the few times where you should consider using market orders to ensure that you get filled on both stocks and aren't legged out on one side! With tight penny-wide markets and huge volume in the ETFs, the slippage will be minimal and shouldn't be an issue.
Stocks have the most risk, but they respond most directly to the change. If the spread moves your way, the stock positions move point for point with the spread. But if you're wrong on the direction of the pair spread, there is no protection against the loss. Stocks are great for pairs trading if you are confident that the correlations will stay high and the spread will move in the direction you expect it to.
thinkorswim, Inc. and its employee, Tony Battista, do not solicit or recommend any form of trading in the individual stocks (or their derivatives) mentioned above. Please do careful, independent research before investing any money as well as weigh the possible consequences on your particular financial situation before doing so. The risk of loss may be substantial.






