The CEO of CLUB (Patrick Walsh) runs a hedge fund (PW Partners) which owns over 3 million shares of CLUB, That would be a good place to start. That fund along with 2 other funds own nearly half of CLUB. If you are short right now, the real question is how to cover when only 14k shares are traded today and the price is still going up. Who is going to provide the shares to cover? I own 30k shares and see no reason at all to sell.
Many mutual funds have covenants that they cannot buy/hold stocks under $3 which is one of the reasons CLUB tanked so much after going under that level. Could see more buyers once CLUB is back over $3.