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After the NASDAQ, Boston stock exchange and the New York stock, here is an item that gets National stock exchange short selling data. The data is available at the exchange website (http://www.nsx.com).
The National Stock Exchange is an exchange based in Chicago, Illinois. It was founded in 1885 in Cincinnati (Ohio) and it was named Cincinnati Stock Exchange.
The exchange was a subsidiary of the Chicago Board Options Exchange and it changed its name to the 'National Stock Exchange' in 1995 when it moved its headquarters to Chicago.
The National Stock Exchange is an all-electronic stock exchange; it closed its physical trading floor in 1976 under Bernie Madoff leadership.
This short selling data is available daily, it contains the date, the ticker symbol, the short sale volume, and the total volume traded. As with other exchanges, only transactions that occurred during the regular trading hours are included.
The short sale aggregate volume is saved into a custom database "nsx_short_volume" that has four fields. The forth filed is named "ratio", and it is calculated by the downloader. It is the short volume divided by the total traded volume (short ratio).
