Bank of America Corporation is a globally diversified financial services holding company. The company operates through four primary business segments: Consumer Banking, Global Wealth & Investment Management (GWIM), Global Banking, and Global Markets. Consumer Banking provides credit, banking, and investment products to retail customers and small businesses, representing the largest portion of its revenue. GWIM offers investment management, brokerage, banking, and retirement products, notably through its Merrill and Bank of America Private Bank brands. Global Banking provides lending, treasury, and underwriting services to mid-sized and large corporations, while Global Markets offers sales and trading services to institutional clients across fixed income, credit, currency, commodity, and equity businesses. Geographically, while Bank of America has an international footprint spanning over 35 countries, the vast majority of its revenue and operations are concentrated in the United States. The bank's competitive position is underpinned by its massive retail deposit base, extensive branch network, and leading market shares in investment banking and wealth management.