This study attempts to empirically explore the strategic impact of corporate diversification on technological innovation and strength measured by investments in research and development (R&D), and number of patents in high-tech industries across several industrialised countries. The major findings of this study demonstrate that corporate diversification strategies in markets and products are significantly related to various indices of technological innovations and economic performance in technology oriented multinational corporations across different countries and industry sectors. One of the significant findings of this study is that diversification strategies can influence a firm's technological capabilities by enhancing the intensity of R&D investments and increasing the number of patents. This study is intends to provide academicians as well as practitioners with more insightful explanation of strategic determinants of technological innovations and strengths in leading technology-oriented multinational corporations (TMCs).