Wei Lin and Gloria Gonzalez-Rivera, "Extreme Returns and Intensity of Trading", Journal of Applied Econometrics, Vol. 34, No. 7, 2019, pp. 1121-1140. The dataset used in this paper is proprietary. It is the property of the Intercontinental Exchange, INC. (ICE), who do not permit open access. Hence the data cannot be lodged here. The data set is held at the ICE/NYSE proprietary historical market daily TAQ (Trade and Quote) (https://www.nyse.com/market-data/historical/daily-taq), to whom enquiries concerning access should be addressed. The variables used in our study and detailed data cleaning procedures are described in Section S.3 of the Online Supplementary Material associated with our paper. Wei Lin weilin_econ [AT] 163.com Gloria Gonzalez-Rivera gloria.gonzalez [AT] ucr.edu