Like @utsav linked correctly, PRO’s are exchange members trading on behalf of themselves. There are almost 2000 brokers/members on the stock exchanges, only around 300 to 400 offer clientele/retail broking. The rest of them essentially have a membership on the exchange just for trading for themselves. All the big trading firms have their own memberships. All of that turnover will show up in PRO. Even most of the 300 to 400 members offering retail broking also have trading desks to trade their own money. All of this turnover will show under PRO.
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