Mitsubishi UFJ Securities International plc (MUSI) was a global investment bank headquartered in London, United Kingdom. Mitsubishi UFJ Securities International was the investment arm of one of the largest financial institutions in the world, Mitsubishi UFJ Financial Group (MUFG). The investment bank was part of an international network with offices in London, New York City, Hong Kong and Singapore. MUSI was active throughout the global capital markets, focusing on investment banking, debt, equity, commodities, derivatives and structured products. MUSI had a staff of approximately 600 people globally.