Big data's arrival has transformed managerial decision-making in many different sectors, most notably the financial one. Big data's era has produced notable changes in financial sector managerial decision-making. Among the main advantages are improved risk management, more data-driven decision-making, and closer consumer insights. To properly leverage big data, though, financial organizations must negotiate issues with data privacy, security, and organizational transformation. Big data's importance in management decision-making is predicted to become even more evident as technology develops, therefore promoting financial industry innovation and efficiency. This study shows how big data shapes managerial decisions in finance, therefore stressing the transforming effects on operations, risk management, customer service, and strategic planning.