4. Bank Of America Corp. Earnings increased by 28% to $21.1 billion at the financial services giant, helped by its $35 billion acquisition of credit-card issuer MBNA. Revenues surged by 39%. | Wal-Mart retakes the No. 1 slot on the Fortune 500 this year. See where America's largest corporations rank, and why. (more) See the 37 companies that made both the Fortune 1000 and Best Companies to Work For lists this year. (more) |