National Bank of Canada generates revenue through four synergistic operational segments. Personal & Commercial Banking (41.0% of revenues, C$4.592B) drives retail deposit spreads, consumer mortgages, payment merchant services, and commercial lending to small-and-medium enterprises, primarily across Quebec and expanding nationally. Wealth Management (24.0%, C$2.688B) gathers fee-based advisory income, asset management fees through National Bank Investments, and securities brokerage. Financial Markets (25.0%, C$2.800B) captures corporate lending interest, investment banking advisory fees, institutional equities, and structured fixed-income underwriting where it ranks as a leading arranger of Canadian provincial and municipal debt. U.S. Specialty Finance & International (10.0%, C$1.120B) delivers high-margin credit spreads via Credigy in U.S. consumer specialty finance and rapid commercial deposit expansion through ABA Bank in Cambodia.