The aim of the article is to show how the use of diagnostic methods allows identifying patterns and problems of corporations functioning, providing identification of directions and strategies for further development of their business. Theoretical and methodological basis of the research is a scientific works of scientists in the field of business diagnostics and strategic development, who studied diagnostics in the system of responding to business development problems, identifying areas for improving strategic management, financial statements of corporations of Daimler Group (Germany), Tesla Motors (USA) and Toyota Motor (Japan) and own research results. The methodological basis of the study is a set of general and special methods used to achieve the goal of the research and includes: theoretical generalization and synthesis – in analyzing the content of scientific works on business diagnostics and strategic management; observation – to obtain primary information about the state of business of automotive companies in the world; indicator and integrated assessment – to assess the state of business and the effectiveness of strategic management of automotive corporations; information and logical analysis – when determining the issues and patterns of business development of corporations; problem-target method – to justify the choice of business development strategies; causation-result method – to obtain definitive conclusions. The results of the study of the state of business of the world's leading automotive corporations revealed the dependence of business efficiency on the degree of efficiency of strategic management of their activities, and identified types of strategies that will promote further development of automotive corporations – integrated, concentrated, diversified or globalized growth. The practical significance of the obtained results lies in their usefulness for strategic management for Daimler Group, Tesla Motors, Toyota Motor Corporation.