According to OTCshortreport, on may 31 100% of MDHI shares sold were naked shorts. While that mey not seem like a big deal since less than 50k shares changed hands, on June 4th, more than 1.3 mil shares were sold and 99.55% were naked short sales. Today--the 5th--67.34% of the nearly 4 mil share volume was naked short sales.
All of OTCshortreport's statistics supposedly come directly from FINRA. They show 5,493,696 naked short shares flooding the market in the last 5 days alone.