Except they have no way of figuring that out until the actual liquidation happens. Perhaps declaring the interval would be good, along with the range during that interval, for example, over the past 30 days the lowest exchanges would be this cap while the highest would be that cap. Or maybe if there were a way to see the proportion hodled during that same interval. But the "volume" that they report, do we know how much of that volume is repeat volume (same stock traded over and over during the interval) versus unique volume? I doubt it, right? A hard problem. The simple market cap based on the latest trade price is still a nice way to compare stocks.