The present dissertation is dedicated to study the regulation of corporate governance practices and performance relationships. Several studies have been conducted around the world, based on how the good corporate governance practices impact the performance of the firm. Good corporate governance is related to the protection of the investor rights, and could be established by changes in law, regulation procedures, contracts, control, and normative procedures or product market influence. The present research is related to the regulation, law changes around corporate governance practices in Mexico, and how those changes influence the performance of the firm. The Mexican economy is affected by globalization, financial market integration, and potential investment opportunities around the world; part of the answer of those changes is regulation and investor protection rights.