A popular argument states that most of the diversification in a portfolio can be obtained with a rather small number of securities. In this paper we present three algorithms to approach the underlying NP-hard problem of portfolio optimization with a cardinality constraint. All three of these...

Using a data set that provides unprecedented details on the stockholders of Swedish listed companies, we analyze whether investors take into account corporate governance when they select stocks. We identify the companies where shareholders’ value is less likely to be maximized by using the...