Grayscot. Seeking Alpha began shorting this back in Oct 16 around the $2.50 range on down to below $1.00. My understanding is they "Naked Shorted" several million shares so it will not appear on any short list.
Naked shorting is the illegal practice of short selling shares that have not been affirmatively determined to exist. Ordinarily, traders must borrow a stock, or determine that it can be borrowed, before they sell it short. Due to various loopholes in the rules, and discrepancies between paper and electronic trading systems, naked shorting continues to happen.
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