Berkshire Hathaway – It's essentially a pre-diversified empire

Berkshire Hathaway is the multinational conglomerate holding company led by legendary investor Warren Buffett (and his late partner Charlie Munger). It owns dozens of companies outright (GEICO, Duracell, See's Candies, BNSF Railway) and holds massive stakes in publicly traded firms like Apple, Coca-Cola, and American Express. The company is famous for having no meaningful corporate headquarters (just a small Omaha office), a decentralized management philosophy, and Buffett's long-running annual letter to shareholders, which is widely read as a primer on investing and business strategy. Understanding Berkshire is essential to understanding modern American capitalism: it is one of the world's most valuable companies and a bellwether for the "value investing" approach that Buffett pioneered. The article's subtitle — "a pre-diversified empire" — means that buying a single share of Berkshire stock gives an investor instant, low-cost exposure to an extremely broad set of businesses across insurance, railroads, utilities, manufacturing, consumer goods, and technology, effectively acting as a diversified portfolio in one stock.