This is only the reported list, which typically doesn't accurately represent the naked shorting that most likely is substantial here.
Unfortunately, the great majority of Pinksheet and OTCBB securities are loosely regulated and watched by governmental agencies, which of course includes the SEC.
The SEC declared that Naked Shorting is illegal, and promised to crack down on this unethical practice - unfortunately, with the number of companies out there, this is very difficult to monitor.
The SEC focuses their attention on the NYSE & NASDAQ listed securities.