Japan’s Stock Market Hits Record High While Wall Street Valuation Fears Grow

Key Takeaways

• Nikkei 225 hit a record high above 72,000 as AI stocks continued to dominate investor attention
• Japan’s massive AI and chip investment plans are helping fuel one of the world’s strongest stock market rallies
• The milestone highlights Japan’s growing role in the global AI boom, though some strategists warn the market may be running hot

Japan’s stock market keeps finding new highs. The Nikkei 225 crossed 72,000 for the first time on Monday as investors continued piling into AI and semiconductor stocks. This extended a rally that has pushed Japanese equities to record territory. The move comes as the government prepares a long-term investment push into strategic industries. At the same time, a different conversation is unfolding on Wall Street, where some analysts are warning that US stocks are trading at historically expensive levels.

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AI Boom Drives Japan Stock Market Higher

The Nikkei 225 closed at 72,353.96 after touching an intraday record of 72,831.73, according to reports. AI-related stocks once again led gains as investors reacted to reports that Prime Minister Sanae Takaichi’s administration plans to target around ¥370 trillion ($2.3 trillion) in public and private investment across AI, semiconductors, and other strategic sectors by 2040.

The rally has also been supported by easing geopolitical concerns after progress in US-Iran negotiations improved sentiment across global markets.

Companies tied to the semiconductor supply chain were among the biggest beneficiaries. Toto shares jumped to a record high after announcing plans to expand its semiconductor equipment components business. Meanwhile, several technology names continued to attract fresh investor interest.

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Wall Street Valuation Fears Continue to Build

While Japan’s stock market benefits from enthusiasm around AI investment, concerns about the US stock market valuation are becoming harder to ignore.

Several valuation measures tracked by market analysts are hovering near record highs. This includes the Shiller P/E ratio, price-to-sales ratios, and the Buffett Indicator. Some composite valuation models now suggest US equities are trading above levels seen during the dot-com bubble.

This doesn’t necessarily mean a market correction is imminent. Strong earnings from major technology companies and continued AI spending have helped support valuations. Still, some investors are becoming very cautious about stock prices.

The AI boom remains the common thread connecting both markets. In Japan, it is helping push the Nikkei 225 to fresh records. In the US, it is fueling gains while also raising questions about how much optimism is already reflected in stock prices.

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