This article explores the different types of companies and legal entities, including micro businesses, small businesses, medium-sized businesses, and large businesses. It provides definitions, characteristics, and examples of each type. The article also discusses different organizational structures and how they impact business productivity. Additionally, it examines the influence of external factors, such as political, economic, sociological, technological, legal, and environmental factors, on business performance. The case study of Aston Martin is used to illustrate these concepts.