Nikkei Hits Record Highs with Sharpest Weekly Gain Driven by AI Rally

Japan's Nikkei 225 index has delivered a powerhouse performance, marking its strongest weekly surge in nearly two years fueled by intense optimism in the artificial intelligence sector. Despite mid-day volatility triggered by geopolitical tensions, the index managed to sustain its momentum, hitting consecutive record highs during a historic week of trading.

AI and Semiconductor Surge Drive Nikkei Performance

The Nikkei index recorded a massive 7.9% rise for the week, marking its sharpest weekly gain since August 2024. This rally was characterized by seven consecutive sessions of gains, signaling deep-seated investor confidence in Japan's technology ecosystem. On Friday, while the index saw some intraday volatility, it closed 0.28% higher at 71,250.06, after having spiked to a record high of 71,952.99 earlier in the session.

The momentum was largely propelled by the semiconductor and AI-related sectors. Industry leaders such as Advantest rose by 4.75%, while memory maker Kioxia saw a significant jump of 12%. This surge highlights the growing appetite among global investors for Japanese firms that are integral to the global AI supply chain.

Fujikura Leads the Charge with Massive Profit Forecast Upgrade

A standout performer during the session was Fujikura, the fibre-optic cable maker, which surged 15.69% to hit its daily limit high of 5,161 yen. This massive rally followed a significant upward revision in the company's annual net profit forecast. Fujikura raised its guidance to 229 billion yen ($1.42 billion), a substantial leap from its previous guidance of 156 billion yen.

This optimistic outlook for AI data center materials also benefited Fujikura’s peers. Furukawa Electric saw its shares surge by 15% as the market reacted to the increased demand for high-speed connectivity components required for AI infrastructure.

Geopolitical Uncertainties and Profit Booking Temper Gains

Despite the technological rally, the broader market faced headwinds. The Topix index fell 0.57% to 4,044.96, largely weighed down by banking stocks. Major financial institutions, including Mitsubishi UFJ Financial Group and Mizuho Financial Group, dropped by 2.85% and 4.42%, respectively.

Two primary factors contributed to this cautious sentiment. First, geopolitical uncertainty regarding the Middle East intensified after reports indicated that U.S. talks with Iranian negotiators in Switzerland had stalled. Daisuke Hashizume, senior strategist at Daiwa Securities, noted that the sudden uncertainty regarding a potential truce created a "tough road ahead" for market sentiment. Second, investors engaged in profit-booking ahead of the weekend, particularly as U.S. markets were scheduled to be closed on Friday.

Key Takeaways

  • AI-Led Growth: The Nikkei recorded a 7.9% weekly gain, its best performance in nearly two years, driven by heavy buying in semiconductor and AI-related stocks.
  • Corporate Outperformance: Fujikura's decision to raise its annual profit forecast to 229 billion yen acted as a major catalyst for the data center materials sector.
  • Geopolitical Headwinds: Uncertainties surrounding Middle East peace negotiations and profit-taking by investors prevented the Nikkei from maintaining its record-high peaks throughout the day.