This study aims to analyze how financial ratios and performance affect customers in the banking industry in greater London. It discusses different types of financial ratios calculated by companies in the banking industry, evaluates the impact of ratio analysis and performance on customer behavior, and explores the usefulness of financial information for customers. The study also examines whether ratio analysis is an effective tool for judging the financial performance of an organization. The results of this research can be valuable for customers making investment decisions and for future researchers in the field.