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A short sale, in trading, is the sale of a stock that you do not own. Here is how it works, when you short sell a stock, your broker will borrow that stock and sell it for you. To close your short position, you will need to buy back that stock, so it can be returned to the lender.
Short sellers believe the stock price will fall and therefore sell short these stocks. When the stock price decrease, they make a profit and when the stock price increase they lose money.
Exchanges keep track of these short transactions; the BATS exchange has this data available for download in its website (the last 3 months). These short sale information concerns all the transaction data that occurred in the BATS exchange for U.S. stocks. According to the BATS exchange, this data is made publicly available to help increase market transparency.
This downloader gets this data by date and inserts into a custom database (short_sale). Two fields are available:
Short_Volume: The short volume for a particular stock and a particular date
Total_Volume: The total volume for a particular stock and a particular date
The 'Automatically add new symbols' option in the parser is checked and so unknown ticker names are directly added to your symbols database.
