This study aims to identify the factors that enable diversified firms with multiple unrelated core businesses to achieve high performance. Diversified firms benefit from advantages such as business scale expansion, risk diversification, and effective utilization of managerial resources, thereby contributing to high competitiveness and sustainable growth. Previous research suggests that, for diversified firms to perform well, it is important to strengthen a single core business and generate its synergy with non-core businesses. However, the discussion on unrelated core businesses is limited. Moreover, cases of diversified firms that maintain multiple unrelated core businesses while achieving high performance are rare. To fill the resulting gap in the literature, this study focuses on Company A, a diversified firm with two unrelated core businesses, and analyzes the reasons for its high performance. The analysis reveals that the coexistence of the two businesses is supported by their equal scale, distinct markets, core technologies, and each firm holding the largest global market share in their respective fields. Furthermore, the unification of control systems across businesses generates synergistic effects, contributing to superior company performance.
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