NO EXCHANGE BIAS, NO SURVIVORSHIP BIAS
Global Financial Data now offers historical price data on common stocks for all stock exchanges in the United States since 1915. No other company provides such a comprehensive record of US Stocks encompassing regional exchanges such as the Boston, Chicago, Philadelphia or Los Angeles.
PROBLEMS IN EQUITY DATA
Inherent problems occur within traditional equity data feeds due to the existence of an exchange bias and the survivorship bias. Only GFD has researched, compiled, generated and produced complete, unabridged individual data sets on U.S. Stock Markets. Coverage includes the
- New York Stock Exchange
- Curb/American Stock Exchange
- Regional Stock Exchanges, and
WHAT ARE YOU MISSING?
Until the 1970s, the American Stock Exchange, called the New York Curb until 1953, listed more foreign issues than all other US stock exchanges combined. Furthermore, many oil and mining stocks, many small-cap companies, many technology companies, and many other types of companies that did not qualify for listing on the New York Stock Exchange listed on the Curb/AMEX.
None of the stocks which were listed on the Curb/AMEX were concurrently listed on the NYSE. In 1972, when the NASDAQ was founded, over 1300 companies, whose total capitalization was half that of the NYSE, were listed on the AMEX. Data for the Curb/AMEX is monthly from 1915 until 1961, and daily since January 1962. Excluding the market data covering the Curb/AMEX no longer provides adequate coverage of the U.S. market.
The American Stock Exchange was originally called the New York Curb since it traded stocks that were not listed on the New York Stock Exchange outside of the building that housed the NYSE. The New York Curb was established in 1908, moved indoors in 1921, changed its name to the New York Curb Exchange in 1929 and to the American Stock Exchange in 1953. The AMEX merged with the New York Stock Exchange in 2008.