The main source of data used in Jitta is from S&P Global Market Intelligence. They are one of the leading professional information companies in the world. Their financial data is used at thousands of Wall Street firms with hundreds of thousands of professionals relying on their data and services to make their investment decisions. All the major websites like Google Finance, Yahoo! Finance, etc. use data from S&P Global Market Intelligence.
We have a license to pull financial data in the past 10 years. We run a lot of analysis on the data and present it in a way that anyone can understand.