This report provides a comprehensive analysis of corporate governance and leadership, focusing on three New Zealand companies: Fonterra, Synlait Milk, and Ngai Tahu Holdings Limited. It examines their ownership structures, governance and leadership models (including the UK/Commonwealth model), and the boards' legal and social responsibilities, including compliance, ethical behavior, sustainability, and the Treaty of Waitangi. The report delves into each company's unique characteristics, such as Fonterra's cooperative model, Synlait Milk's sole proprietorship, and Ngai Tahu Holdings' trust-based structure. It also addresses ethical lessons, corporate social responsibility, and financial sustainability. The analysis includes discussions on director responsibilities, shareholder involvement, and the impact of different ownership models on decision-making processes. The report concludes with recommendations based on the findings, offering insights into best practices for corporate governance and leadership in the New Zealand context.