As of 9:15 a.m., the 225-issue Nikkei Stock Average added 86.45 points, or 0.30 percent, from Tuesday to 28,448.62.
The broader Topix index of all First Section issues on the Tokyo Stock Exchange, meanwhile, gained 12.65 points, or 0.68 percent, at 1,859.67.
Transportation equipment, rubber product and textile and apparel issues comprised those that gained the most in the opening minutes after the morning bell.
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