Shorting, particularily the naked kind caused the Crash of 29' & the Depression of the 30's that followed it!
SLJB is a grey sheet quoted on the pinks. It is not marginable. You can't short a stock that is not marginable. If one could find an offshore brokerage somewhere that would allow one to open a margin account to short SLJB, it would cost a minimum of $2.50 to $5/share to short, plus a few grand to open the account. So to short SLJB, just 1 million shares, would require between $2.5 - $5 million margin. No brokerage would allow it anyway, but it is obviously cost-prohibitive to short penny crap. "Naked shorting" is what hedge funds do. SEC Rule 17ad-10 defines it as overissuance that is "securities not readily marketable". It is what insiders of non-reporting pinkies do. They use unregistered securities to hedge their insider trading. PIPE financiers do same. Reference any hedge fund prospectus. This kind of naked shorting is common and abused by insiders of non-reporting pinks. "Shorty" is almost always the insiders and any toxic PIPE VC's.