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-- (historical) stock prices --

What do you mean by that? Nominal, real, corrected due to monetary-base-change, corrections with Y-other-things? What is your goal?

I have been able to download (historical) stock prices via yahoo and google.

Alas looking historical data from Google/Yahoo's screeners can be highly misleading and making conclusion based on it very dangerous. Please, note that you cannot always trust the data, sometimes they are nominal or real, and sometimes you won't know the type of data. Google/Yahoo are only third-parties to provide you the historical data.

Commercial Data

• CSI Data: it claims to be the provider to Google, Yahoo, Microsoft and other resellers
• Yahoo's providers here and notice the small writings at the bottom here

Educational and Research Data

• Shiller Data about stock market data
• the huge data collection by Ibbotson, book, inflation, interest rates and such things which you must take into account to do any serious research
• Yale data bases and again a lot of high-quality information here
• Intelligent Asset Allocator -book, by William Bernstein, in the very end has a summary of very good data sources

-- (historical) stock prices --

What do you mean by that? Nominal, real, corrected due to monetary-base-change, corrections with Y-other-things? What is your goal?

I have been able to download (historical) stock prices via yahoo and google.

Alas looking historical data from Google/Yahoo's screeners can be highly misleading and making conclusion based on it very dangerous. Please, note that you cannot always trust the data, sometimes they are nominal or real, and sometimes you won't know the type of data. Google/Yahoo are only third-parties to provide you the historical data.

Commercial Data

• CSI Data: it claims to be the provider to Google, Yahoo, Microsoft and other resellers
• Yahoo's providers here and notice the small writings at the bottom here

Educational and Research Data

• Shiller Data about stock market data
• the huge data collection by Ibbotson, book, inflation, interest rates and such things which you must take into account to do any serious research
• Yale databases (massive work done) here
• Intelligent Asset Allocator -book, by William Bernstein, in the very end has a summary of very good data sources

"Historical"?

What do you mean by that? Nominal, real, corrected due to monetary-base-change, corrections with Y-other-things? Alas looking historical data from Google/Yahoo's screeners can be highly misleading and making conclusion based on it very dangerous. Please, note that you cannot always trust the data, sometimes they are nominal or real, and sometimes you won't know the type of data. So you should coherently use the data (particularly with historical data it is good idea to test data with many providers). And by the way Google/Yahoo are only third-parties to provide you the historical data. It seems that G. has removed the outgoing link to its data-provider/affliates, alas you can still see that their TOS is very restrictive with their data, here. Hence, I suggest data provided more for educational purposes:

• Shiller Data about stock market data
• the huge data collection by Ibbotson, book, inflation, interest rates and such things which you must take into account to do any serious research
• Yale data bases and again a lot of high-quality information here
• Intelligent Asset Allocator -book, by William Bernstein, in the very end has a summary of very good data sources

-- (historical) stock prices --

What do you mean by that? Nominal, real, corrected due to monetary-base-change, corrections with Y-other-things? What is your goal?

I have been able to download (historical) stock prices via yahoo and google.

Alas looking historical data from Google/Yahoo's screeners can be highly misleading and making conclusion based on it very dangerous. Please, note that you cannot always trust the data, sometimes they are nominal or real, and sometimes you won't know the type of data. Google/Yahoo are only third-parties to provide you the historical data.

Commercial Data

• CSI Data: it claims to be the provider to Google, Yahoo, Microsoft and other resellers
• Yahoo's providers here and notice the small writings at the bottom here

Educational and Research Data

• Shiller Data about stock market data
• the huge data collection by Ibbotson, book, inflation, interest rates and such things which you must take into account to do any serious research
• Yale data bases and again a lot of high-quality information here
• Intelligent Asset Allocator -book, by William Bernstein, in the very end has a summary of very good data sources

"Historical"?

Please, note that you cannot always trust the data, sometimes they are nominal or real, and sometimes you won't know the type of data. So you should coherently use the data (particularly with historical data it is good idea to test data with many providers).

• Shiller Data
• the huge data collection by Ibbotson, book, inflation, interest rates and such things which you must take into account to do any serious research

and, by the way, Google or Yahoo are only third-parties to provide you the historical data. It seems that either G has removed the outgoing link to its data-provider/affliates but you can see that the TOS are very restrictive with their data, here.

"Historical"?

What do you mean by that? Nominal, real, corrected due to monetary-base-change, corrections with Y-other-things? Alas looking historical data from Google/Yahoo's screeners can be highly misleading and making conclusion based on it very dangerous. Please, note that you cannot always trust the data, sometimes they are nominal or real, and sometimes you won't know the type of data. So you should coherently use the data (particularly with historical data it is good idea to test data with many providers). And by the way Google/Yahoo are only third-parties to provide you the historical data. It seems that G. has removed the outgoing link to its data-provider/affliates, alas you can still see that their TOS is very restrictive with their data, here. Hence, I suggest data provided more for educational purposes:

• Shiller Data about stock market data
• the huge data collection by Ibbotson, book, inflation, interest rates and such things which you must take into account to do any serious research
• Yale data bases and again a lot of high-quality information here
• Intelligent Asset Allocator -book, by William Bernstein, in the very end has a summary of very good data sources