Short selling BBAJF is an investing strategy that aims to generate trading profit from Banco del Bajío, S.A., Institución de Banca Múltiple as its price is falling. To short Banco del Bajío, S.A., Institución de Banca Múltiple stock, an investor borrows shares, sells them and buys the shares back on the public market later to return it to the lender. Short sellers are betting that Banco del Bajío, S.A., Institución de Banca Múltiple will decline in price. If the stock does drop after selling, the short seller buys it back at a lower price and returns it to the lender. The difference between the sell price and the buy price is the trader's profit.