This document summarizes a case study on the merger between CIMB and Southern Bank Berhad (SBB) in Malaysia. The merger was intended to strengthen CIMB's consumer banking capabilities by acquiring SBB, which was known for its credit card business. The results of the study found no significant difference in CIMB's performance before and after the merger in the short-run, but acquiring firms can experience positive returns in the long-run from mergers. The merger was considered a "win-win" situation, providing good compensation for SBB shareholders while enhancing value for CIMB through additional banking products.