Japan's Nikkei 225 index experienced a milestone on June 1, 2026, closing above 67,000 for the first time in history at 67,038.24. This represented a 1.1% increase, with the index adding 709 points in a single session. The driving force behind this surge was a robust rally in stocks within the artificial intelligence sector.
SoftBank Group was a standout performer, seeing its shares rise by 10.3% during the day, contributing 618 points to the Nikkei's upward trajectory. This means that SoftBank was responsible for approximately 87% of the index’s record climb.
#What Does This Rally Mean for Major Companies?
The surge in SoftBank's stock elevated its market capitalization to ¥47.2 trillion, surpassing Toyota Motor's ¥45.7 trillion. This marked the first occasion since 2000 that SoftBank claimed the title of Japan's most valuable listed company. SoftBank's rapid rise highlights a shift in investment focus from traditional heavyweights like Toyota, a company renowned for producing around 10 million vehicles annually and employing a vast global workforce, to a holding company with significant stakes in firms like Arm Holdings and OpenAI.
#How Is the Broader Market Responding?
Alongside SoftBank, the broader IT sector also gained traction, with the Nikkei climbing by 4.3%. Retail investors flocked to semiconductor-related stocks, notably Murata Manufacturing, which saw gains of up to 14.1% during the session. The Nikkei index reached an intraday high of 67,231.28, reflecting the widespread enthusiasm surrounding tech stocks.
#What Are the Risks for Investors?
Investors should remain cautious regarding the concentration risks demonstrated by this rally. With one stock generating 87% of the index's gains, continued growth may depend heavily on SoftBank's performance. Historically, SoftBank has exhibited substantial volatility, evidenced by losses in its Vision Fund during the tech downturn of 2022 before a significant recovery.
In contrast, Toyota's financial stability is derived from consistent cash flow generated through actual automobile sales, while SoftBank’s valuation relies on investments in various companies, many of which are still in development phases and not yet profitable in their AI initiatives.