Mitsubishi Corp gained 1.9 percent after a unit of Warren Buffett's Berkshire Hathaway said it had increased its stake in the trading house to 10.23 percent from 9.74 percent. Rival Mitsui & Co rose 1.2 percent.
Technology investor SoftBank rallied 3.2 percent and chip-making equipment maker Tokyo Electron added a little over 2 percent.
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