The document discusses the role of private information in the success of horizontal mergers and acquisitions (M&A), especially in the banking sector, asserting that larger firms leverage their intellectual capital to achieve favorable outcomes. It critiques traditional event study literature that often underestimates acquirer gains and presents a robust theory arguing that acquirers can successfully harness private information for significant value creation. The paper emphasizes empirical evidence from Asian banking M&A, suggesting that effective management of private information leads to higher returns for acquirers.