Warren Buffett's Berkshire Hathaway buys stakes in Japan's five leading trading companiesThey say 90 is the new 70, and in Warren Buffett's case, it may be true. The chairman and CEO of Berkshire Hathaway announced Sunday — his 90th birthday — that his company has acquired a slightly more than 5% stake in each of the five leading Japanese trading companies. The companies are Itochu Corp., Marubeni Corp., Mitsubishi Corp., Mitsui & Co., and Sumitomo Corp. Berkshire said it acquired the
