Berkshire Hathaway is a holding company with a wide array of subsidiaries engaged in diverse activities. The firm's core business segment is insurance, run primarily through Geico, Berkshire Hathaway Reinsurance Group, and Berkshire Hathaway Primary Group. Berkshire has used the excess cash thrown off from these and its other operations over the years to acquire Burlington Northern Santa Fe (railroad), Berkshire Hathaway Energy (utilities and energy distributors), and the companies that make up its manufacturing, service, and retailing operations (which include five of Berkshire's largest noninsurance pretax earnings generators: Precision Castparts, Lubrizol, Clayton Homes, Marmon, and IMC/ISCAR). The conglomerate is unique in that it is run on a completely decentralized basis.

Berkshire Hathaway Inc.

Activision Blizzard

Aon plc

Capital One

Home Capital Group

Apple

Bank of America

STORE Capital

Teva Pharmaceuticals

Taiwan Semiconductor Manufacturing Company

Nubank

Occidental Petroleum

One97 Communications

Pilot Flying J

Restoration Hardware

Kroger

Pershing Square Capital Management

Gregory E. Abel

Berkshire Hathaway

NYSE:BRK.B