Short Sale Short, also known as Short Selling, in the stock market, investors predict stock price means coming down, or wishing to engage in securities ruling, the first to sell such securities, and to borrow shares and then sell or set back the agreement on schedule apply for settlement, then as soon as the right time to make progress, an act of profits obtained sufficient compensation expenses. Sold borrowed stock, usually expect a certain time in the future, with a lower price to buy back their shares back to the original holders of the stock, the transaction can only vent to vent account (Short Account) conduct, such as price-inverting rising, then the borrowed shares may also be the deadline to return must be bought in the market.