Shares of SoftBank Group skyrocketed more than 16% on Thursday, leading a powerful technology-driven rally that pushed Japan’s Nikkei 225 to fresh all-time highs as investors rushed back into artificial intelligence and semiconductor stocks.

The rally came as Japanese markets reopened following an extended Golden Week holiday break, giving traders their first opportunity to react to several days of strong gains across global technology markets, particularly in the United States.

The Nikkei surged more than 5% during the session, fueled by heavy buying in chipmakers, semiconductor equipment suppliers, and AI-related investment firms. The move marked one of the strongest single-day advances for Japanese equities in recent years and reinforced growing optimism surrounding the global AI infrastructure boom.

SoftBank Emerges as One of the Biggest AI Winners

SoftBank delivered its strongest trading performance since 2020, with shares climbing as much as 16.5% during the session. Investors poured into the stock due to the company’s deep exposure to artificial intelligence through its major stakes and partnerships tied to chip designer Arm and AI leader OpenAI.

Market analysts increasingly view SoftBank as one of the most direct publicly traded ways to gain exposure to the accelerating AI economy.

The company’s strategic positioning has become even more important as global demand for AI computing power, data center expansion, and next-generation cloud infrastructure continues to surge.

SoftBank’s relationship with Arm Holdings has become a major driver of investor optimism. Arm’s chip architecture powers a large percentage of the world’s smartphones and is increasingly being adopted in AI servers and data centers because of its energy efficiency and performance advantages.

The rally also reflected growing expectations that AI inference systems and agentic AI platforms will require enormous long-term investments in computing infrastructure, processors, networking equipment, and advanced semiconductor technologies.

Japanese Semiconductor Stocks Surge Alongside Global AI Boom

The gains extended well beyond SoftBank as Japan’s semiconductor sector experienced one of its strongest sessions in years.

Advantest Corporation, one of the world’s leading chip-testing equipment manufacturers, jumped nearly 8%, while Tokyo Electron surged more than 9% as investors aggressively bought companies tied to AI chip production.

Meanwhile, Renesas Electronics Corporation soared almost 14%, adding to the momentum across Japan’s broader semiconductor supply chain.

Analysts say Japanese chip equipment makers are benefiting from their critical role in the global AI race. As companies worldwide ramp up investments in advanced semiconductors and AI servers, demand for testing systems, fabrication equipment, and high-performance processors continues rising sharply.

Japan remains a major player in the global semiconductor ecosystem, supplying critical manufacturing tools, materials, and technologies used by chipmakers around the world.

Wall Street’s AI Frenzy Sparks Global Ripple Effect

Japan’s market rebound followed another record-breaking session on Wall Street, where the tech-heavy Nasdaq Composite climbed to fresh highs driven by soaring AI-related stocks.

Several major U.S. technology companies posted extraordinary gains overnight, creating momentum that quickly spread into Asian markets.

Advanced Micro Devices Inc. surged more than 18% after investors reacted positively to its earnings outlook and AI growth forecasts. Arm Holdings climbed around 13%, while Super Micro Computer Inc. jumped over 24% as enthusiasm around AI server demand intensified.

Market strategists noted that Japan had effectively missed multiple days of global gains due to the holiday closure, creating a catch-up rally once trading resumed.

The sharp rise in Japanese semiconductor stocks highlighted how closely global markets are now linked through the AI investment cycle.

AI Infrastructure Spending Becomes the Main Market Theme

Behind the rally is a much larger investment story centered around the future of artificial intelligence infrastructure.

Analysts say investors are increasingly focusing on the massive computing requirements needed to support AI inference systems, large language models, autonomous AI agents, and enterprise AI platforms.

While graphics processing units continue to dominate headlines, central processing units and broader data center infrastructure are also becoming critical pieces of the AI ecosystem.

Industry experts believe the next phase of AI growth will require trillions of dollars in infrastructure spending over the coming decade, including servers, networking hardware, advanced cooling systems, memory chips, and power-efficient processors.

AMD recently forecast that the global market for data center CPUs alone could grow to approximately $120 billion by 2030, representing annual growth of more than 35%.

That outlook has boosted investor confidence across the entire semiconductor value chain, especially among companies positioned to supply AI-related hardware and infrastructure solutions.

Easing Geopolitical Tensions Also Helped Sentiment

Broader market sentiment received additional support from signs of easing geopolitical tensions between the United States and Iran, which helped push oil prices lower during the week.

Lower energy prices tend to improve investor confidence by reducing inflation concerns and easing pressure on global economic growth expectations.

Combined with the ongoing AI boom, the softer geopolitical environment created favorable conditions for a strong risk-on rally across Asian technology stocks.

Japan Reclaims Investor Attention

The latest surge also signals renewed global interest in Japanese equities after years of relatively subdued international attention.

Japan’s stock market has increasingly benefited from corporate governance reforms, stronger shareholder returns, improving earnings growth, and a global rotation into semiconductor and technology stocks.

With the AI boom accelerating and Japan holding a strategic role in the semiconductor supply chain, many investors now view the country as one of the key beneficiaries of the next generation of technology spending.

As enthusiasm around artificial intelligence continues reshaping global markets, Japanese tech giants and chip companies are rapidly becoming some of the most closely watched stocks in the world.