As of 9:15 a.m., the 225-issue Nikkei Stock Average added 391.88 points, or 1.45 percent, from Wednesday to 27,447.82.
The broader Topix index of all First Section issues on the Tokyo Stock Exchange, meanwhile, gained 31.69 points, or 1.76 percent, at 1,827.87.
Insurance, bank, and iron and steel-linked issues comprised those that gained the most in the opening minutes after the morning bell.
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