Tokyo AI Stocks Slide as SoftBank, Advantest Drag Nikkei on Dec. 15, 2025 — BOJ Rate Hike in Focus
The Nikkei 225 dropped 1.31% to 50,168.11 on December 15, 2025, led by steep declines in AI-linked stocks such as Advantest, down 6.4%, and SoftBank Group, off 6%. The broader Topix rose 0.22% as financials outperformed, supported by expectations of a Bank of Japan rate hike. A global tech pullback and a stronger yen pressured Tokyo’s AI and semiconductor shares.