Worthy, the big volume spike on May 2 came after the PIPE shares were declared effective by the SEC. (The company filed a Form 424B3 on May 5).
Recently, the stock has moved up as the amount of buyers has overcome the ST sellers from the PIPE. The quick flippers are gone, and now there are more long term holders in the stock. The stock is no longer on the Reg SHO list, which shows that the shorts think that hedging is no longer needed, or that the risks of being short are outweighed by the risk of being long a speculative play.
The company is closer to getting registered on the AMEX, but they still have to get over $3.00/share. Of course, they could remedy that tomorrow by doing a reverse split like IPII.