80% of Warren Buffett's Portfolio Is Invested in These 7 Stocks By: Motley Fool July 29, 2022 at 05:06 AM EDT Diversification isn't necessary if you know what you're doing, according to the Oracle of Omaha. Read More >> Related Stocks: American Express Apple Bank of America Berkshire Hathaway Berkshire Hathaway Chevron Corp Coca-Cola Company Kraft Heinz Company Occidental Petroleum