Kevin Lamarque/Reuters Most people know Berkshire Hathaway as the investment vehicle for Warren Buffett’s $83 billion fortune. Berkshire Hathaway owns or has majority stake in numerous other companies. Berkshire Hathaway's portfolio covers the finance, insurance, manufacturing, service and even railroad sectors. Most people know Berkshire Hathaway as the massive conglomerate that serves as the investment vehicle for Warren Buffett’s $83 billion fortune.