I don't know. I have thought about that as well.
However, we haven't had any trading days of late anywhere near 500M and based on the trading activity, most of the shares are probably accounted for.
That is one of the reasons I believe this thing could really shoot up when Envirotek informs us of everything they are involved in.
If we all hold, only those shares that the MM's are holding will be sold as it rises and based on all the people on this board, I can't imagine them holding more than 250M.