“…Our data set stems from one of the largest online banks in Germany. 5 The data contain daily information on the logins (from 2012 onward), trades, and portfolio holdings of the bank's customers as well as all the balances and transactions of each investor's checking, savings, and settlement accounts with the 4 Related to our findings for paper gains and losses, An et al (2019) find that the disposition effect is more pronounced when the portfolio trades at a loss, which is in line with Bernard, Loos, and Weber (2018) and Loos, Meyer, and Pagel (2018), who show that the disposition effect is more pronounced after busts than in boom markets. 5 As of 2016, the five largest online banks without branch representation (Direktbanken ohne Filialnetz) in Germany are as follows: ING-Diba (8.3 million customers), Deutsche Kreditbank (3.3 million), Comdirect (2.1 million), Volkswagen Bank (1.1 million), and Mercedes-Benz Bank (1.1 million).…”