Charts That Rule the World: A thinkorswim® Special Focus

Charts That Rule the World: A thinkorswim® Special Focus

Key Takeaways

    Become familiar with the different charting features available on thinkorswim

    Understand how to compare charts, create drawing alerts, and backtest strategies directly from price charts 

    Use the expansion area of a price chart to identify future corporate actions and probable price ranges

There are plenty of charting programs out there. But seriously, why look further? The charts on the thinkorswim trading platform can do pretty much everything you could possibly need—even if you’re not a chart reader.

Want to compare two stocks on one chart? No problem. What about setting an alert for when price breaks out of a trendline? Want to do a little backtesting before jumping into a trade? You’re covered. What about technical indicators, you ask? The platform has hundreds of preloaded studies and strategies. You can even develop your own studies right in thinkorswim.

If you’re new to charting, you can brush up on technical analysis and how to read stock charts. Let’s map out some of the features that chartists and (non-chartists) can use in day-to-day trading from the Charts tab on thinkorswim.

Overlay Charts

An overlay chart plots two or more different stocks or indices on the same price chart. It’s a way to see relative performance—whether one is over- or underperforming the other. It can be a way to measure relative strength, and it’s also handy if you’re looking at correlations between stocks, sectors, or asset classes such as the financial sector versus the S&P 500 Index (see figure 1).

Charts That Rule the World: A thinkorswim® Special Focus

FIGURE 1: COMPARING NOTES. Use the overlay function in thinkorswim to compare two symbols: in this case the S&P 500 Index (SPX, candlesticks) and the financial sector (IXM, purple line). Data source: S&P Dow Jones Indices. Chart source: the thinkorswim platform from TD Ameritrade. For illustrative purposes only. Past performance does not guarantee future results.

Ready to give it a try? Here’s how to create an overlay:

    From the Charts tab, bring up a chart. Look in the upper right and select Studies, and then hover over Add study to see the expanded menu.Select Compare with at the bottom of that menu. You’ll see a list of default index symbols such as DJX and SPX, as well as Custom symbol… at the top. Choose a default symbol or enter a custom one to overlay it on the chart.

The left vertical axis will be scaled for the overlay symbol so the high and low range fits on the same chart. You can also add more indices or custom symbols. 

To take overlays one step further, open Chart settings (gear icon), and under the Price Axis tab and check Show price as percentage. That switches the right vertical axis to show percentage changes, which may help you compare the performance of the symbols you’re charting.

Drawing Alerts

Did you know you can set alerts based on chart drawings such as trendlines, retracement levels, price channels, and so on? Whenever a security’s price breaks through a trend you’ve defined, you’ll be notified. 

Setting up such an alert is straightforward. Simply select a drawing and right click to select Create alert with drawing…. This opens up a dialog where you can define how you’d like the alert to trigger (see figure 2). Because all drawings are (in effect) simple lines, alerts can trigger when prices cross them.  

Beyond that, all the standard alert preferences can be set from this menu, such as the notification method or when the alert should expire. Once you enter the parameters, select Create to set the alert. A flag appears on the chart drawing to indicate that an alert has been set. You can edit or cancel the alert by right-clicking the flag.

Before creating the alert, you can also check the Show Alert Book after I press ‘Create’ box. This will add the drawing alert to the Alert Book section of the MarketWatch tab, along with any other alerts you’ve set. You’ll see the name of the drawing and symbol for each alert, as well as the time frame of the applicable chart. This last bit is important to keep in mind to avoid confusion. The slopes of lines change when they’re applied to different chart aggregations, so remember that an alert will trigger only when a crossover occurs on the same aggregation as the original chart.

For example, it’s possible to see a crossover on a 15-minute chart that doesn’t appear on a 5-minute chart. If the alert was created on the 5-minute chart, then it wouldn’t trigger. To remind you of this, the flag will show up only on charts of the same aggregation, and the entry in the order book will specify the aggregation as well. 

Charts That Rule the World: A thinkorswim® Special Focus

FIGURE 2: TREND ALERT! Add alerts based on chart drawings to be notified when a stock smacks through the bottom of a trendline or breaks out above it. Chart source: the thinkorswim platform from TD Ameritrade. For illustrative purposes only. Past performance does not guarantee future results.


You can backtest trading strategies based on technical indicators and see the hypothetical profit & loss (p&l) performance right on your charts. The charts offer “Strategies,” which are simulated long and short entry and closing points determined by a technical indicator. You can even code your own strategy. That’s beyond the scope of this article, but here’s how to get started (see figure 3).

Charts That Rule the World: A thinkorswim® Special Focus

FIGURE 3: REAL TEST, FAKE MONEY. Backtest a strategy to see how it might have performed historically. Then view the entry and exit points on the chart, as well as a p&l, before committing real dollars. Chart source: the thinkorswim platform from TD Ameritrade. For illustrative purposes only. Past performance does not guarantee future results.

To try out backtesting:

    Go to Studies in the upper right and select the Edit Studies icon at the upper right.
    In the window that pops up, choose the Strategies tab.
    On the left you’ll see a list of default strategies. To make a strategy engage, you need to add commands that’ll show both “long entry” (LE) and “short entry” (SE) at a minimum.
    For practice, you can look for the BollingerBandsLE and BollingerBandsSE strategies. Those are the long-entry and short-entry commands based on Bollinger Bands. Double-click on each one and it will be added to the list of studies and strategies in the main body of the Edit Studies and Strategies window.
    Select Apply in the lower right corner, then OK.

You should now see “BollingerBandsLE” and “BollingerBandsSE” labels on your chart, indicating the simulated buying and selling of 100 shares of stock based on the Bollinger Bands test. To see the p&l of those simulated trades, hover directly over one of the labels and right-click to open a new menu. Select Show Report to open the Strategy Report window. Here you’ll find the buy and sell signals and p&l data for the strategy.

And by the way, if you want to buy or sell the stock shares for real, right-click in the chart’s main body and select Buy or Sell from the menu. Plus, at the far right of the chart, you’ll see tabs for Trade, Time and Sales, Level II, and so on. These let you add windows with those features next to the chart window. It basically lets you set up Charts as your go-to page for stock and futures trading.

A final note on backtesting. Never forget the old adage (and standard financial disclaimer): Past performance of a security or strategy does not guarantee future results or investing success. It’s particularly important when backtesting for strategy selection

Future Corporate Actions

thinkorswim charts let you plot future dates to the right of the current date. Why? To help you locate upcoming earnings and dividend dates, for one thing. Plus, you can extend drawings like trendlines off into the future to identify possible price targets. How to do it? Take a look at figure 4.

Charts That Rule the World: A thinkorswim® Special Focus

FIGURE 4: PEEKING AT THE FUTURE. By adjusting a chart to display future bars on the right (the expansion area), you can view upcoming earnings and dividend dates. Chart source: the thinkorswim platform from TD Ameritrade. For illustrative purposes only. Past performance does not guarantee future results.

To chart a future period in the expansion area:

    Select Style at the upper right and choose Settings… from the menu.Select the Time axis tab in the Chart Settings window.
    Now look for the Expansion area control. You can enter a number in the field for bars to the right—say, 10—then select Apply at the bottom right.

This will add some empty space to the right of the current date on the chart (see figure 4). Now you can extend a trendline or other drawing into that space. Hover directly over the trendline and right-click. Select Extend to the right from the menu and you’ll see the line extend to those future dates.

The Cool Probability Cone

A study that’s built specifically for those future dates is the Probability of Expiring Cone (figure 5), which gives you a probable price range at different contract expirations (weeks or months). The cone draws the upper and lower bounds of a symbol’s price range to theoretically encompass a predefined level of probability.

Charts That Rule the World: A thinkorswim® Special Focus

FIGURE 5: WHAT’S THE PROBABLE PRICE RANGE? The probability cone (purple curve) helps to estimate the upper and lower bounds of a stock or index’s price range within a predefined level of probability. Chart source: the thinkorswim platform from TD Ameritrade. For illustrative purposes only. Past performance does not guarantee future results.

One way to add the cone study is to select StudiesEdit studies icon and find ProbabilityOfExpiringCone on the left of the window. Double-click to add it to the list of chart studies. You’ll also find two fields to edit for the study. The “period” is the number of future dates for which the probability cone is calculated, and the “prob range” is the probability the projected range covers. The default “prob range” is 68%, which corresponds roughly to one standard deviation. Set it to 95% to see a cone that covers two standard deviations, or 99% to cover three standard deviations. (Learn more about probabilities and volatility.) 

These features really just scratch the surface of thinkorswim charting functionality. But hopefully you now have an idea of the scope and how to access some of the potential. Each of the many menus offers more choices that will lead you to additional functions. Go ahead and continue to explore thinkorswim charts to see just how hard you can make them work for you.

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