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I am looking for a reliable data source provider for 1 to 320 minute S&P500 data. Or the ES mini contract.

Can anyone suggest a good source for this?

Thanks! Andrew

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Good list of reviewed data sources from Caltech (includes Tickdata.com mentioned in previous posts).

http://quant.caltech.edu/historical-stock-data.html#

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I get this data (both the index and the Eminis) from TICKDATA.COM (I am not affiliated with this company). Reliable and high quality. I am sure there are many many satisfactory other sources.

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