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system
is a stock's trade size history publicly available?
user
my broker and probably many brokers provide this information in a table format under "course of sale". it provides the time, price and volume of each trade on that day. you could also view this data on a chart in some charting programs. just set the interval to "tick by tick" and look at the volume. "tick by tick" will basically place a mark for every trade that is taken and then the volume will tell you the size of that trade.
assistant