This chapter, part of the fifth peer review based on the OECD Principles of Corporate Governance, summarises public and private supervision and enforcement practices in the United States, in particular in the areas of related party transactions (RPTs), takeover bids and shareholder meetings. The chapter, prepared largely by Laurence Hamermesh, Professor, Widener University School of Law, acting as a consultant to the OECD, highlights the key characteristics, strengths and limitations of the US framework for corporate governancerelated enforcement, including a strong reliance on private supervision through shareholder lawsuits. It also examines the interaction of private supervision and enforcement with public enforcement, of governance rules applicable to related-party transactions (RPTs) and takeovers.