Buffett strongly believes in concentrating Berkshire Hathaway's investment capital into his best ideas. Five top-tier companies, with clear competitive advantages and phenomenal capital-return programs,

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Berkshire Hathaway basically owns other companies. A lot of companies are structured this way, but what sets Berkshire apart is the vast number of companies that live underneath its broad umbrella. Those companies span a surprising range of industries.

Warren Buffett’s Berkshire Hathaway Inc. continued whittling a longtime bet on Bank of America Corp. in last year’s final months, while keeping a stake in Apple Inc. intact following an earlier reduction.