This study examines the operational synergies achieved through the post-integration strategies adopted following the merger of HDFC Ltd. and HDFC Bank Ltd. The research evaluates the impact of the merger on key financial performance indicators, including Revenue/Operating Income, Net Profit, Return on Equity (ROE), and Net Interest Margin (NIM), using secondary data collected from the annual reports of HDFC Bank Ltd. and other reliable financial sources. A comparative analysis, descriptive statistics, and an Independent Samples t-test were employed to assess the differences in financial performance before and after the merger. The findings reveal significant improvements in Revenue, Net Profit, and Return on Equity, indicating that the merger strengthened operational efficiency and enhanced financial performance. However, Net Interest Margin did not exhibit a statistically significant change during the study period. Overall, the study concludes that the post-integration strategies implemented after the merger successfully contributed to operational synergies and long-term value creation. The findings provide valuable insights for corporate managers, investors, and policymakers regarding the role of effective post-merger integration in achieving sustainable organizational growth.