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Objectives: This study aims to quantitatively examine the impact of the Cash Conversion Cycle (CCC) and working capital efficiency on operating profit margins in Japanese software firms. With the rapid advancement of technological innovation and intensifying international competition in Japan's software market, effective cash management has become crucial for sustaining profitability. This research specifically seeks to elucidate how shortening the CCC and optimizing working capital influence firms' operating profit margins. Methods/Approach: Targeting Japanese software firms, this study employs multiple regression analysis to statistically investigate the relationship between CCC, working capital efficiency, and operating profit margins. The analysis evaluates how varying CCC lengths affect profitability and assesses the impact of efficient working capital management on corporate cash flow cycles and reinvestment activities. Results: The results indicate that firms with shorter CCCs benefit from quicker cash collection, enabling timely reinvestment that positively influences operating profit margins. In particular, SaaS companies and software manufacturers, facing unique cash flow challenges from subscription-based revenue models, benefit from efficient cash flow cycles that support reinvestment in product development and R&D, fostering innovation and enhancing market competitiveness. Conversely, firms with longer CCCs tend to experience delays in cash collection, which adversely impacts working capital, leading to lower operating profit margins. Moreover, firms that effectively manage working capital can achieve sustainable growth and profitability without reliance on external funding by strategically utilizing internal capital. Conclusions: This study empirically demonstrates the impact of CCC and working capital efficiency on the financial performance of Japanese software firms, highlighting the role of effective cash management in strengthening competitiveness and profitability. The findings offer valuable insights for constructing financial strategies that enhance the sustained competitive advantage and profitability of Japanese software companies. Future research should consider exploring the effects of digital transformation and emerging financial technologies on cash flow management, broadening the understanding of these dynamics across various industries and regions.