CRSP (Center for Research in Securities Prices)
A collection of datasets with basic and derived information for securities traded on U.S. exchanges (NYSE, AMEX, and NASDAQ). Monthly data starts generally in 1925, while daily data starts in 1962. Types of data include: Bid or Low, Holding Period Return, Ask or High, Year-end Capitalization Closing Price, Year-end Capitalization Portfolio Volume, and Shares Outstanding.
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