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The following datasets pertain to research relating to mergers and acquisitions done by faculty and fellows of the Program on Corporate Governance:

Data on the Entrenchment Index 1990-2008
[based on Bebchuk, Cohen, and Ferrell, "What Matters in Corporate Governance?"The Review of Financial Studies, Vol. 22 (2), February 2009, pp. 783-827.]
List of Seventy-Five Studies Using the Entrenchment Index

Data on staggered boards 1990-2002
[based on Bebchuk and Cohen, "The Costs of Enternched Boards," Journal of Financial Economics, Vol. 78, 409-433 (2005).]

Data on State Antitakeover Index 1986-2001
[based on Bebchuk and Cohen, "Firms Decisions where to Incorporate," Journal of Law and Economics, Vol. 46, 383-425 (2003).]