The fact that there are very few buyers or buying interest at any price leads me to believe that HPNN may drop at least 90% in the next month or so.
Spo far, the stock price appears to have been kep at current high levels mostly by buying of tiny share blocks to make it look like there is buying interest.
That seems to be the only way the HPNN share price would increae. You may remeber that HPNN did reverse splits after diluting their shareholders to almost nothing.
soon after the reverse split, the stock price resumes the dowhill slide.
If HPNN doesn't provide the audited financials it promised numerous times, the share price could drop at least 90% in a hurry.