Global investment banking hubs include cities such as New York, London, Hong Kong, and Tokyo. JPMorgan Chase, Morgan Stanley, Goldman Sachs, Bank of America, and Citigroup are among the world's major investment banks. When it comes to investment banks, size matters. The largest investment banks are part of the bulge bracket, which is a tiny group of extremely large corporations that handle the majority of the world's financial transactions. Middle-market or "boutique" banks are smaller investment banks.