Honestly MRIB isn't worth shorting. SureTrader is one of the best brokers to short with, but subpenny isn't allowed to be bought or shorted there iirc. Also fees will eat your ass shorting MRIB. Also if a stock is under 2.50 you've got to have a rather large account to short a amount that will make you money. Honestly imo it'd be s complete waste of time, and hold up to much capital to short MRIB.