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If you think or forecast that a stock will lose value in the future, you can borrow this stock in exchange of an interest you will have to pay (this interest depends on the period you hold this stock). You can then sell this borrowed asset and earn money if it decreases in value. When the lender wants its stock back, you can buy the same stock in the market and then give it back to the lender. Let us say you sold the stock at 20$; for the sake of simplicity we will not account for the interest you will have to pay. After the holding period, when you return back the stock to the lender, if the stock decreases in price and is valued at 10$. This means that you bought it back at 10$ and thus earned 10$. However, if the stock increases in price and is valued at 30$. This means that you bought it back at 30$ and thus lost 10$. This process is what is called a short sale in trading. Short selling offers traders a means to profit from a declining market, overpriced stocks... As you just saw, the mechanics of a short transaction (selling stocks that you do not own) is much more complex than the mechanics of a buy transaction. Fortunately, your broker will handle all of this for you. The broker will borrow stocks for you; he will give them back to the lender when you want to cover your position. He will also calculate and tell you exactly how much interest you need to pay for borrowing that security. However, you will need to have a margin account to take part in any kind of short selling. These kinds of brokerage accounts will have minimal capital requirements. QuantShare When using this trading software to developed trading strategies, you can create long or/and short trading systems. Instead of the traditional process of buying and selling securities, short trading systems allow you to short sell stocks, which means that instead of buying stocks, the trading system will short stocks and instead of selling stocks, the trading system will cover stocks. When you create a trading system with the simulator tool (Analysis -> Simulator -> New), you can select the type of system you want to create. Near "System Type", you can choose between three options: Long, Short or Long/Short. Below that button, you can specify the rules for your short selling stocks strategy in the Short and Cover boxes. When analyzing trading rules using the rules analyzer tool (Analysis -> Rules Manager -> Analyze), you can specify one or several outputs/exit rules. If you select for example the "use N-Bars stop" and change the "Type" from "Buy" to "Short", you will end up with an exit rule of type "Short then cover after x bars". Finally, I would like to point out the fact that short selling stocks is a riskier trading activity. In fact, the maximum loss of buying stocks is limited to the invested amount, while the potential loss of short selling stocks is unlimited. This is because there is no limit to how high a stock or security can go. For example, a stock may experience a high earning surprise that could increase its price by more than 100%. The unlucky trader who short sold this stock may, in this situation, loose much more than the money he invested. Trading objects that may interest you: NYSE Arca - Daily short sale data NASDAQ and Boston stock exchanges - Daily short sale data Short Selling historical data NSX - Daily short selling data Short Selling Data
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