The Center for Research in Security Prices, LLC (CRSP) is a provider of historical stock market and investable index data.
CRSP maintains some of the largest and most comprehensive proprietary historical databases in stock market research.
Its goal was to provide a source of accurate and comprehensive data that could be used to answer basic questions about the behavior of stock markets.
[1] Since then the database has been kept up to date to the present day, daily data has been expanded back to 1926, and other exchanges and financial instruments have been added.
On January 1, 2020, CRSP spun off from Chicago Booth and became Center for Research in Security Prices, LLC.