As of 9:15 a.m., the 225-issue Nikkei Stock Average gained 270.51 points, or 1.26 percent, from Wednesday to 21,689.74.
The broader Topix index of all First Section issues on the Tokyo Stock Exchange, meanwhile, added 15.03 points, or 0.97 percent, at 1,564.50.
Bank, iron and steel and securities house-linked issues comprised those that gained the most in the opening minutes after the morning bell.
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