94% of Warren Buffett's $321 Billion Portfolio Is Invested in Only 4 Sectors By: Motley Fool March 17, 2023 at 05:06 AM EDT The Oracle of Omaha's investment portfolio is especially concentrated by sector. Read More >> Related Stocks: American Express Apple Bank of America Berkshire Hathaway Berkshire Hathaway Chevron Corp Coca-Cola Company Kraft Heinz Company Occidental Petroleum