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How to identify and trade gaps using ChartMill


A gap is nothing more than a change in price levels between the close and open of two consecutive days.  We distinguish two types of gaps. A full gap and a partial gap. There is a full gap when the opening price is higher than the highest price of the previous day. A Partial gap occurs when today’s opening price is higher than yesterday’s close, but not higher than yesterday’s high.


For the purpose of this article, only the full gap will be discussed. A ‘full gap up’ is a bullish gap (higher prices), a ‘full gap down’ is bearish (lower prices).

In ChartMill, you can easily use a filter to detect bullish or bearish gaps that occurred during the past trading day. To do this, select the “technical” tab in the stockscreener and open the “Signals” filter where you can choose between “gap down” or “gap up”.


In addition, it is also possible to find “gaps” in the past that will allow you to test your own (intraday) trading strategies wtith gaps. You can do this by using the additional “Historical Date” filter under the “General” tab.


For example, through the link below, we have selected all shares with the following parameters:
Signal: gap up (after last trading day)
Minimum price: 5
Average volume: 500,000

Gap up’s‘ after the last trading day

If we want to apply this selection on Wednesday, May 24th, then the same parameters apply but we add the “Historical date” filter with the option “2017-05-24″.

Gap up’s‘ after wednesday 24 may 2017.

Some ‘Gap Trading’ Strategies

Responding to gaps can be done in several ways:

If you are a daytrader you can use a shortterm countertrend strategy by initiating a short position if there are indications on the intraday chart that the gap will be closed. In the chart below you could go short when price falls below the low of the gap up candle.


Same chart on a 10 minutes timeframe…

NTNX_chart (1)

In an overal bullish trend, the level where the price gap is closed is a very interesting place for trend- or swingtraders to go long, speculating on the fact that the long term bullish trend will resume from that price level. Of course, short term traders can also benefit from this specific pricelevel to make a quick profit.


Another possibility for both the short- and longterm trader is to go long on the day after the gap up day, but only if price breaks above the highest price of the gap up day. Especially if the volume was much higher than normal during the gap up candle. This is indeed a sign that there is greatly increased momentum.


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We shouldn’t really need to say this, but chartmill is a tool that helps you make your analysis. Your trading is your responsibility and nothing on this website should be interpreted as direct advice to buy and/or sell securities.

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