He owns stocks and entire companies such as Dairy Queen & GEICO. Through Berkshire Hathaway's subsidiaries, CEO Warren Buffett owns 62 companies and has a major stakeholding in hundreds of companies in a broad market portfolio. Warren Buffett owns many companies via Berkshire Hathaway.
Warren Buffet can attribute most of his wealth to Berkshire Hathaway that has 65 subsidiaries in industries such as food and beverage, jewelry, and financial services. Berkshire-Hathaway wholly owns companies GEICO, Duracell, and Helzberg Diamonds, among others.