As of 9:15 a.m., the 225-issue Nikkei Stock Average added 94.21 points, or 0.40 percent, from Tuesday to 23,661.25.
The broader Topix index of all First Section issues on the Tokyo Stock Exchange, meanwhile, gained 16.45 points, or 1.01 percent, at 1,642.19.
Air transportation, mining and nonferrous metal-oriented issues comprised those that declined the most in the opening minutes after the morning bell.
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