For a long time, merger control by competition authorities concentrated on the acquisition of major shares of companies or entire mergers while largely treating minority shareholdings as unproblematic. Only very recently, this traditional view is more and more challenged – not least due to possible cartel-stabilizing effects of minority shareholdings – suggesting the inclusion of minority share acquisitions in merger control procedures. In this context, the project aims at investigating a possible relationship between minority shareholdings and anticompetitive behavior from both theoretical and empirical perspectives.