Large Block Ratio Indicator

The Large Block Ratio is a market sentiment indicator that shows the relationship between large block trades (or trades of more than 10,000 shares) and the total traded volume on the New York Stock Exchange.

This indicator will tell you how active the large institutional traders in the market.

Because the ratio is built by dividing the number of shares from block trades by the total number of shares traded on NYSE, the higher the ratio value is the more institutional activity is happening. Of course, a low reading indicates that institutional activity is low.

This large block ratio indicator makes use of two ticker symbols (^TOTAL_SHARES and ^Block_Trades_+10000) that are created and filled by the following downloader:
NYSE - Trading Volume

You need to install and run the downloader first before using this ratio indicator.


Here is for example how to plot the indicator on a chart:
a = BlockRatio();
plot(a, "Large Block Ratio", colorBlue);


You may also want to smooth the indicator by applying a 10 or 20-bar moving average. But for this, you will need to gather some data first by running the above downloader regularly.
a = sma(BlockRatio(), 10);
plot(a, "Large Block Ratio Smoothed Version", colorGreen);

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