As of 9:15 a.m., the 225-issue Nikkei Stock Average added 615.09 points, or 2.12 percent, from Friday to 29,581.10.
The broader Topix index of all First Section issues on the Tokyo Stock Exchange, meanwhile, rose 30.76 points, or 1.65 percent, at 1,895.25.
Information and communication, precision instrument, and electric appliance issues comprised those that gained the most in the opening minutes after the morning bell.
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