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Daily Share Volume
Make better educated trading and routing decisions by tracking market participants' trading activity in specific stocks, sectors and indexes with NASDAQ Daily Share Volume. NASDAQ Daily Share Volume is the "gold-source" of data with values for volume and ranking. Data accounts for trades executed through the NASDAQ Execution System. It gives credit to both parties involved in a trade and looks through hidden, reserve and anonymous trades — including odd lot trades. Reports are available after market close on the same day a trade is executed and aggregated on a monthly basis.
Review the end of disk 17 of the Online Trading School video series to understand how to use this data by Mar 31