Readers of Warren Buffett's letters to Berkshire Hathaway shareholders have gained an enormously valuable informal education in the art of investing. Broad in scope and long on wisdom, Buffett's letters explain his principles on sound investing, selecting managers, valuing businesses, using financial information profitably, and other vital topics for investors. This newly updated Fourth Edition includes Buffett's latest wisdom on such topics as the financial crisis, the housing bubble, corporate governance, Berkshire Hathaway's acquisition of Burlington Northern Santa Fe, the role of oversight in heavily regulated industries, today's best investing opportunities, and the weaknesses of popular option valuation models.