As of 9:15 a.m., the 225-issue Nikkei Stock Average added 37.52 points, or 0.17 percent, from Tuesday to 22,325.66.
The broader Topix index of all First Section issues on the Tokyo Stock Exchange, meanwhile, shed 1.07 points, or 0.07 percent, at 1,557.70.
Security houses and nonferrous metal-oriented issues comprised those that advanced the most in the opening minutes after the morning bell.
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