As of 9:15 a.m., the 225-issue Nikkei Stock Average added 221.46 points, or 1.05 percent, from Wednesday to 21,321.52.
The broader Topix index of all First Section issues on the Tokyo Stock Exchange, meanwhile, gained 11.77 points, or 0.78 percent, to 1,514.27.
Pharmaceutical, electric power and gas and services-linked issues comprised those that gained the most in the opening minutes after the morning bell.
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