A method and system for providing a stock purchase index is provided. The system receives raw customer trading data. The raw customer trading data is segregated into buy and sell data per CUSIP to determine a number of buy CUSIP shares, a number of sell CUSIP shares, a total buy CUSIP market value, a total sell CUSIP market value, a total number of buy accounts, and a total number of sell accounts. The sorted data is processed to produce a stock purchase index report, wherein the stock purchase index report is a sell weighted index. The sell weighted index is then displayed in the stock purchase index report.