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These Asian firms in Buffett's Berkshire Hathaway portfolio have surged, with one soaring 30%
Warren Buffett, Berkshire Hathaway CEO and chairman. Cnbc | Nbcuniversal | Getty Images The five trading firms in Warren Buffett-backed Berkshire Hathaway's portfolio — Itochu Corp, Marubeni Corp, Mitsubishi Corp, Mitsui & Co, and Sumitomo Corp — …