As of 9:15 a.m., the 225-issue Nikkei Stock Average added 122.17 points, or 0.55 percent, from Thursday to 22,268.13.
The broader Topix index of all First Section issues on the Tokyo Stock Exchange, meanwhile, gained 7.44 points, or 0.48 percent, at 1,550.20.
Insurance, precision instrument and chemical-oriented issues comprised those that gained the most in the opening minutes after the morning bell.
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