As of 9:15 a.m., the 225-issue Nikkei Stock Average added 133.50 points, or 0.50 percent, from Friday to 26,786.02.
The broader Topix index of all First Section issues on the Tokyo Stock Exchange, meanwhile, gained 11.54 points, or 0.65 percent, at 1,793.55.
Insurance, machinery and information and communication issues comprised those that gained the most in the opening minutes after the morning bell.
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