Dichev [2007. American Economic Review 97, 386-401], in an influential paper, examines the gap between the performance of major stock markets and the dollar-weighted performance of investors in these markets. He finds a significant gap of 1.3 percent per year for NYSE/AMEX and 1.5 percent...

Using new data for the universe of firms covered in Amadeus, we reconstruct the portfolios of shareholders who hold equity stakes in private- and publicly traded European firms. We find great heterogeneity in the degree of portfolio diversification across large shareholders. Exploiting this...