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system
where can i find information on the percentage of volume is contributed by shorts?
user
you can do a lot of deduction finra keeps a "reg-sho" list created daily that tells what the daily short volume is. march 26th 2014's list: http://regsho.finra.org/fnsqshvol20140326.txt if you are talking about the united states, this answer may be better ;)
assistant