Besides Berkshire Hathaway, Apple is the stock people most often associate with Buffett nowadays. The iPhone maker has been the largest holding in the Oracle of Omaha's portfolio for years. Buffett once called Apple the best business in the world -- high praise for any company.

Warren Buffett has held Coca-Cola stock for many years as a staple in the Berkshire Hathaway portfolio. A look back at the first purchase and how much investors could have made copying him.

Warren Buffett attributes his investment success to principles from The Intelligent Investor by Benjamin Graham. These principles include treating market fluctuations as opportunities, insisting on a margin of safety,