As of 9:15 a.m., the 225-issue Nikkei Stock Average gained 384.29 points, or 1.66 percent, from Wednesday to 23,589.05.
The broader Topix index of all First Section issues on the Tokyo Stock Exchange, meanwhile, added 21.78 points, or 1.28 percent, at 1,723.18.
Marine transportation, machinery and precision instrument-linked issues comprised those that gained the most in the opening minutes after the morning bell.
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