Abstract: Systems, methods, and computer program product for generating a report or document including a data representation reflecting a distribution of hidden trade order volume across different locations and a relative size, including average hidden order volume, volume executed against hidden orders, as a percentage of total trading volume by exchange, liquidity group and time bins. Order execution data is received for a plurality of executed trades via an electronic quotation feed associated with an electronic trading forum for trading both displayed orders and non-displayed orders. For a plurality of time periods, the location within the best bid, best offer spread, of each executed trade of the plurality of executed trades, is determined by comparing the price of each executed trade for hidden orders to quotes on a limit book for the electronic trading forum at a point in time substantially immediately before the corresponding executed trade.