As of 9:15 a.m., the 225-issue Nikkei Stock Average added 133.75 points, or 0.50 percent, from Tuesday to 26,821.59.
The broader Topix index of all First Section issues on the Tokyo Stock Exchange, meanwhile, gained 10.10 points, or 0.57 percent, at 1,792.15.
Marine transportation, real estate and securities brokerage-linked issues comprised those that advanced the most in the opening minutes after the morning bell.
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