Governance Index Data by Firm, 1990-2006. For details on the construction of the Governance Index, see Gompers, Paul A., Joy L. Ishii, and Andrew Metrick “Corporate Governance and Equity Prices”, The Quarterly Journal of Economics 118 (1), February 2003, 1007-155.
Blockholder Data by Firm, 1996-2001. For details on the construction of the Blockholder database, see Dlugosz, Jen, Ruediger Fahlenbrach, Paul A Gompers, and Andrew Metrick “Large Blocks of Stock: Prevalence, Size, and Measurement,” forthcoming in Journal of Corporate Finance.
Dual class firms, 1994-2002. For details on the construction of the Dual-class database, see Paul A. Gompers, Joy L. Ishii and Andrew Metrick, “Extreme Governance: An Analysis of Dual-Class Companies in the United States.”