93% of Warren Buffett's Portfolio Is in These 4 Sectors By: Motley Fool November 25, 2022 at 05:06 AM EST The Oracle of Omaha is a big believer in portfolio concentration. Read More >> Related Stocks: American Express Apple Bank of America Berkshire Hathaway Berkshire Hathaway Chevron Corp Coca-Cola Company Occidental Petroleum Taiwan Semiconductor ADR