yesterday was a fairly heavy volume day, so i took the ES tick chart and looked at the distribution of the volume (the data table attached) - looks like almost 3/4 of the total volume is traded in 6-25-lot blocks - i understand that some of these may be parts of scaled, bigger orders/trades. i am interested to find out which trader groups/categories might drive the volume is this 6-25 lot segment (if it's appropriate to look at this segment separately) for example, is there a way to find out how much volume do the locals in the pit do in aggregrate for their own account... - that would be one group - i don't have access to the pit contract data, i understand the volume there is smaller than ES but still this would be relevant/comparable data. i do not have access to CME's subscription based data - do they offer any data of this sort? in general, the information that i have seen in terms of identifying the players is mostly limited to (a) the aggregate program trading volume on the NYSE and (b) the commerical interest in the futures. is anyone aware of any other sources of this type of information, hopefully more specific than what one sees in the general press? thx in advance.