find the number of shares of a stock traded on different exchanges?

Is there a web service to find the number of shares of a stock traded on different exchanges? For example, i would like to find the daily volumes of SPY traded on island, ARCA, etc. respectively. How can I do this? Help is appreciated.
 
Sign up for Arcavision. I think it's still free. They have a stock volume tool that breaks down a stock's trading volume by venue.
 
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