Of which most of the dollar value is NOT non-reporting companies like GDSM but high-dollar value foreign securities. Look at the 10 most active (which you conveniently cut from your screen shot as it completely proves my point) - 9 of the 10? Foreign stocks who are fully reporting in their home country. The 10th is Tribune, which is in bankruptcy as a debtor in possession and has audited financials from PWC.
Here is the list of today's top dollar traders on the Pink OTC. Not a single non-reporting company anywhere near the top.