But DTCC has dropped HPNN, so trading has to be order-order if cleared through them. The only way you would likely execute a sell order is if there was a matching order to buy.
With all the dilution HPNN is doing, I think $0.0001 price is much too high.
Another problem......Nevada (their state of incorporation) indicates they have 1.5 billion authorized. Apparently HPNN disclosed to pinksheets that they have 2.5 billion authorized. This seems like a major problem to me.