Global institutional investors are re-rating the Japanese stock market, shifting its perception from a traditional low-valuation value market to an AI-driven growth investment destination. The market, long seen by global investors as a haven for value stocks, is now attracting massive inflows from growth-oriented funds into the AI semiconductor sector. Concurrently, Japanese tech companies deeply linked to AI computing infrastructure are surging to the top of the market capitalization rankings, displacing the automakers and telecom giants that have dominated for decades.

"We have been increasing our exposure to the Japanese market based on the strong profit growth outlook for Japanese companies," said Kei Takizawa, a senior investment strategist at AllianceBernstein Japan, discussing a strategy for investing in global innovative firms. He added that Japanese companies are playing an increasingly critical role in building the world's AI computing infrastructure.

Since the start of the year, Japan's stock market has decoupled completely from its government bond market and the yen's exchange rate. Foreign capital has continued to pour in on a large scale, propelling stocks to record highs, while bonds and the yen have languished. High-weight constituents of the Nikkei 225, such as Kioxia Holdings Corp, SoftBank Group Corp, Socionext Inc, Advantest Corp, Tokyo Electron Ltd, Lasertec Corporation, Disco Corporation, Murata Manufacturing Co Ltd, and Taiyo Yuden Co Ltd—all involved in AI chips or semiconductor equipment crucial to AI infrastructure—have been the central narrative for this sustained foreign inflow and the core contributors to the Nikkei 225's record-breaking gains.

Global Capital Shifts from Old Economy to New Tech Foundation

The grand investment narrative of global capital this year, often described as "seeking silicon-based inflation, abandoning carbon-based," is essentially capital rotating from "carbon-based assets"—traditional manufacturing, autos, consumer goods, real estate, and energy reliant on population, resources, and linear growth—towards "silicon-based assets." These are the high-end manufacturing chains centered on silicon wafers related to AI computing infrastructure, such as AI GPU components, HBM/DRAM/NAND memory chips, advanced packaging, cutting-edge semiconductor equipment like lithography machines, data center power chains, data center CPU components, and optical interconnects/communication.

This is not merely a chase for tech stocks; it is global capital re-pricing the "core vehicle for future growth." Entities that control AI computing infrastructure resources for AI training and inference command higher valuation premiums, with the Japanese stock market being a prime example. Last Friday, Japan-based memory chip maker Kioxia Holdings Corp replaced Toyota Motor Corp as the country's most valuable company, a shift highlighting how the global AI boom is dramatically reshaping Japan's corporate landscape and investment trends.

Kioxia Holdings Corp shares surged 7.6% on Friday, pushing its market capitalization past 44 trillion yen (approx. $274 billion) just 18 months after its listing. Toyota Motor Corp closed the day with a market cap of 43.8 trillion yen, having briefly been overtaken earlier by SoftBank Group Corp.

The relentless, powerful rally of Japan's AI chip and semiconductor equipment leaders can be seen as part of the re-rating trajectory of the AI computing supply chain, fueled by the spillover effects of record demand for Nvidia's AI GPUs. Compared to the US and South Korean markets, also dominated by the AI computing frenzy, Japan's uniqueness lies in not having a super-dominant AI chip/DRAM memory champion like Nvidia, AMD, Micron, Broadcom, Google, SK Hynix, or Samsung. Instead, it possesses a host of indispensable AI semiconductor-related assets deeply embedded in the AI computing supply chain, such as Kioxia Holdings Corp, Tokyo Electron Ltd, Advantest Corp, Disco Corporation, Lasertec Corporation, Socionext Inc, SoftBank Group Corp, and MLCC giants Murata Manufacturing Co Ltd and Taiyo Yuden Co Ltd. Consequently, foreign investors widely regard Japan as the "second front in the AI computing infrastructure supply chain."

Japanese semiconductor equipment and materials companies, in particular, play key roles in the equipment value chain related to core AI computing infrastructure like AI GPUs and AI ASICs. For instance, the EUV mask actinic inspection technology, the focus of Lasertec Corporation—whose stock has skyrocketed 200% since 2025—is a crucial and indispensable link in the global AI chip supply chain. Compared to US-based giants Applied Materials and Lam Research, Japan's Tokyo Electron Ltd holds the highest global market share in coaters/developers and is a formidable competitor to Applied Materials in areas like ALD, CVD, PVD, RTP, CMP, etching, and ion implantation equipment.

Nvidia's earnings and the strong performance dynamics of AI computing-related companies clearly underscore that the global frenzy for AI computing infrastructure construction is far from over. It is expanding from AI GPUs/ASICs to data center CPUs, high-performance networking infrastructure, enterprise-grade HBM/DRAM/NAND memory, server clusters at the system level, and AI super factories and large-scale enterprise AI cloud computing systems. Morgan Stanley predicts that by 2028, nearly $3 trillion in AI-related infrastructure investment will flow through the global economy, with over 80% of the spending still ahead.

The Transition from Value to Growth: Toyota's Crown Passes, Japan's Market Enters AI Era

Due to Japan's sluggish economic growth and declining population, investors have historically categorized Japanese stocks as a low-growth value play. After 2023, global investment interest re-emerged, driven by Warren Buffett's increased stakes in Japan's top trading houses and corporate governance reforms led by the Tokyo Stock Exchange. However, the market's appeal remained rooted in its long-term cheap valuations relative to Western markets.

Today, the rising importance of high-growth Japanese tech firms closely linked to AI semiconductors and computing infrastructure in the global AI build-out and investment landscape signals a meaningful shift in the core investment narrative for Japanese equities. While this may mean more global investors allocate capital to Japan in the coming years, it also highlights the risk of a significant market correction if the AI-driven investment trend reverses sharply—for instance, if North American tech giants significantly cut AI-related capital expenditures due to unclear monetization paths.

As illustrated, Toyota has lost its crown—the title of Japan's most valuable company has finally changed hands. Note: 2005 and 2025 data are year-end, latest data as of June 22.

"We are seeing more and more foreign investors interested in the growth potential of Japanese companies, which was relatively rare in the past," said Richard Kaye, co-head of Japanese equity strategy at Comgest Asset Management. He added that such clients include major pension funds from overseas markets.

This change is clearly reflected in Japan's market cap rankings. Memory chip maker Kioxia Holdings Corp surpassed Toyota this month to become the top company. SoftBank Group Corp also briefly overtook Toyota, while other AI infrastructure-related companies are joining the ranks of market leaders in gains and valuation. This marks a massive transformation; a decade ago, the top spots were almost entirely occupied by automakers and telecom giants.

"Japan's stock market image could shift from a market dominated by cyclical forces driven by manufacturing to one increasingly defined by large-cap growth tech stocks, with AI-driven semiconductor-related companies leading this change," said Jumpei Tanaka, head of investment strategy at Pictet Asset Management Japan Ltd. "This could prompt global investors to view Japan as a market deserving higher allocation weight in AI computing thematic trades, potentially attracting further capital inflows."

As shown, Toyota Motor dominated the Japanese market for over a decade—top companies by market cap in major developed markets. The Price-to-Earnings (P/E) ratio also reflects the changing dynamics, offering insight into investor growth expectations. The forward 12-month P/E for the "Core 30" large-cap blue chips in the Topix index—the largest, most liquid companies—has long been lower than that of other large-caps and small-to-mid caps. In recent years, the overall P/E for these large blue chips has been at higher levels and consistently widening the valuation gap with smaller rivals, indicating growing investor confidence in the long-term earnings growth prospects of Japan's leading companies.

The market's re-rating of Japanese equities has also pushed their trading price to around 17 times forward earnings, above the roughly 14 times level of a decade ago and exceeding the overall valuation levels of markets like the UK and France.

The Double-Edged Sword of Growth Re-rating: Inflows, Higher Valuations, and AI Volatility Risks

The significant AI computing investment opportunity in Japan does not come without warnings. As major AI infrastructure-related stocks are prone to sharp price swings due to high leverage and crowded AI trades, market volatility may increase further. According to Nikkei statistics, among the top ten constituents of the Nikkei 225, AI computing-related tech companies account for over 40% of the index's weight, explaining why the Nikkei 225 has significantly outperformed other Japanese market benchmarks this year.

As illustrated, Japanese stock valuations have risen over the past decade—a long-term valuation dynamics comparison among major developed markets—yet they still appear relatively inexpensive compared to the US market.

Nevertheless, Japan's exposure to the AI computing trade theme remains far less concentrated than in South Korean or Taiwanese stock markets, which are dominated by a handful of chip super-giants closely tied to AI infrastructure. Some investors see Japanese stocks as an attractive way to diversify from US stocks trading at historically high valuations with extreme AI exposure, while still benefiting from the global AI computing theme rally.

"Unlike South Korea and Taiwan, where AI thematic investment choices are very limited—funds are essentially crowded into SK Hynix, Samsung, TSMC, and Foxconn—Japan alone has 50 to 60 tech companies related to AI chip components/AI computing clusters," said Kaye from Comgest. He added that many institutional investors, including large European pension funds, have not yet fully recognized the breadth of Japan's AI-related investment landscape, suggesting room for further capital inflows into Japanese equities.

Even traditional value investors with deep expertise in Japan are beginning to shift their views. First Eagle Investments recently increased its stake in a Japanese IT services company, citing expectations for widespread adoption of AI agents by domestic Japanese firms. Christian Heck, deputy head of global value investing at the firm's New York office, stated that one of the funds he leads is moving beyond its historical focus on the TSE-led corporate governance reforms and capital efficiency improvements. "Our conversations with Japanese companies now focus on where they are deploying capital for growth," he said.