As of 9:15 a.m., the 225-issue Nikkei Stock Average added 125.65 points, or 0.54 percent, from Tuesday to 23,263.72.
The broader Topix index of all First Section issues on the Tokyo Stock Exchange, meanwhile, gained 3.92 points, or 0.24 percent, at 1,619.73.
Information and communication, electric appliance, and glass and ceramic product issues comprised those that advanced the most in the opening minutes after the morning bell.
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