The study examines merger strategy affects the financial performance of India's banking industry, with a particular emphasis on State Bank of India and its affiliated banks. The study's goal is to compare the financial results of SBI and its affiliated banks—State Bank of Hyderabad, State Bank of Mysore, State Bank of Patiala, State Bank of Travancore, and State Bank of Bikaner & Jaipur—before and after their merger. In order to combine quantitative analysis of financial indicators with qualitative evaluations of the major performance-influencing factors, the study uses a mixed-methods methodology. The results of the investigation also point to the merger strategy's beneficial effects. After the merger, there were increased client base, increased efficiency, and synergistic effects.