UBS Group AG, with over $5 trillion in invested assets, is Switzerland's largest bank. The company has a sprawling international footprint, with over half of its wealth management assets coming from clients in the United States. Experts believe these customers are drawn to strict bank-client laws in Switzerland. In recent decades, scandals have embroiled both UBS and its latest acquisition, Credit Suisse. After regulators quickly approved of the merger, fresh litigation risks have come to light.