Japan’s Nikkei plunges on AI leaders’ safety concerns, while TOPIX rises

The story

Japan’s Nikkei 225 fell 1.61% from the previous day to close at 62,979.17. Declines were particularly pronounced among the technology stocks covered, while TOPIX rose 0.40% to 4,044.29.

OpenAI CEO Sam Altman was reportedly said to have denied plans for a 2026 IPO, amid rapidly evolving AI technology and its potential risks. On Saturday, Anthropic CEO Dario Amodei called on AI companies to pursue development cautiously.

Ahead of central bank meetings this week, expectations are growing that the U.S. Federal Reserve and the Bank of Japan may raise interest rates. Uncertainty surrounding the situation in the Middle East is also affecting sentiment.

Among Nikkei 225 constituents, SoftBank Group was the top decliner, falling 11.73%, followed by Resonac Holdings, down 8.95%, and Taiyo Yuden, down 7.85%. Among gainers, NEC rose 6.26%, Nomura Research Institute gained 6.08%, and Recruit Holdings increased 5.87%.

At a glance

Nikkei Average62,979.17, down 1.61% from the previous day

TOPIX4,044.29, up 0.40%

AI warningReport that Altman denied a 2026 IPO

DeclinersSoftBank Group 11.73%

AdvancersNEC 6.26%

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