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Wednesday, August 01, 2012 11:06:19 AM
In your case, my platform chart shows your exact volume traded yesterday at 11:58 EST. Your platform most likely does not use the same data source as my platform. I can't see who the market maker was for your trade so, based on your not being able to see your exact trade, I expect that your trade was executed in the "dark pool" which was probably from market maker inventory. It was shown on the ticker but was not executed through the normal exchange process and thus was not included in most stock quote data sources.
There are many sources for stock data. I had thought that everyone would use the ticker for volume and price. Research last year yielded a very different story. It seems all the data sources use the ticker for price but some use the exchanges for volume. You can only tell the difference if you can sum up all the volume off the ticker and compare it to exchange reported data. Prior to looking into this, I didn't even know "dark pools" existed. Pulling on that thread yielded a real education about how the market works for the insiders. The market apparently has it's own grey (black - dark pool) market just like everything else.
Flatcat
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