Shares of the largest Japanese trading houses rallied on Tuesday after a regulatory filing showed that Warren Buffet's Berkshire Hathaway raised its stakes in them. The five companies are the biggest trading houses,

National Indemnity, a wholly owned unit of Berkshire Hathaway, said that it increased its stakes in the five trading houses by between 1.0% and 1.7%.

Warren Buffett's Berkshire Hathaway raised its holdings in five Japanese trading houses, regulatory filings showed on Monday, in the U.S. conglomerate's latest investments in Japan's top commodity firms that began nearly five years ago.