This study presents a ten-year longitudinal examination of how data-driven decision making (DDD) contributes to business value across industries. Using a mixed-method approach combining archival datasets, executive surveys, and case studies from 2014–2024, the article evaluates financial performance, operational efficiency, strategic adaptability, and organizational culture. The findings demonstrate that companies adopting DDD experienced measurable improvements in productivity (14–28%), revenue growth (5–12%), and decision-cycle reduction (35–60%). The research highlights patterns of value realization, temporal variance in analytics maturity, and the evolving role of AI-augmented decision models. Practical implications are offered for firms seeking long-term value creation through systematic data use.