As of 9:15 a.m. local time, the 225-issue Nikkei Stock Average added 191.18 points, or 0.81 percent, from Wednesday to 23,886.41.
The broader Topix index of all First Section issues on the Tokyo Stock Exchange, meanwhile, rose 4.60 points, or 0.28 percent, at 1,631.85.
Pharmaceutical, precision instrument, and information and communication issues comprised those that gained the most in the opening minute after the morning bell.
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