KEY POINTS
  • "For Japanese institutional investors, this really is now the stamp of approval that Japan can deliver superior returns," Monex Group's Jesper Koll told CNBC's "Street Signs Asia."
  • He added that Buffett will benefit from the upper hand that the top Japanese trading houses hold.

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Warren Buffett, chairman and chief executive officer of Berkshire Hathaway Inc., in Fukushima Prefecture, Japan, on Monday, Nov. 21, 2011.

Berkshire Hathaway's Warren Buffett is in Japan and recently revealed that he raised his stakes in the country's top trading houses, saying he was "confounded" by the opportunity to buy them two years ago.

The five companies — Mitsubishi Corp.Mitsui & Co., Itochu Corp, Marubeni Corp., Sumitomo Corp. saw two consecutive days of gains as Buffett confirmed he added roughly another percentage point to his holdings. Berkshire Hathaway's stakes in all five trading houses is now 7.4%.

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