These are the publicly traded U.S. stocks owned by Warren Buffett's holding company Berkshire Hathaway, as reported to the Securities and Exchange Commission in filings made available to the public.

A little more than a year ago, on a trip to Nairobi, Kenya, some colleagues and I met a 12-year-old Masai boy named Richard Turere, who told us a fascinating story. His family raises livestock on the ...