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Historical data files for NYSE/NASDAQ daily open/close price data?
Another possibly more flexible option is Yahoo finance here is an example for the dow.. http://finance.yahoo.com/q/hp?s=%5EDJI&a=9&b=1&c=1928&d=3&e=10&f=2012&g=d&z=66&y=0 Some of the individual stocks you can dl directly to a spreadsheet (not sure why this isn't offer for indexs but copy and paste should work). http://finance.yahoo.com/q/hp?s=ACTC.OB+Historical+Prices