1) The document presents an analysis of ownership structures and control rights in large and medium-sized firms across 27 wealthy countries. 2) It finds that approximately 1/3 of firms are widely held, contradicting the Berle and Means view, while family ownership is dominant, owning over 50% of firms. 3) Voting rights are often separated from cash flow rights through mechanisms like multiple share classes, cross-shareholdings, and pyramid structures, especially in countries with less legal minority shareholder protection.