Tech giant SoftBank has become Japan’s biggest company by market value, as AI demand powered the country’s stocks to an all-time high and helped Masayoshi Son’s company overtake Toyota.
The car manufacturer and industrial giant has been Japan’s biggest company by market capitalisation for more than 20 years, and its ousting from the top slot reflects rising global investor interest in AI and semiconductor companies.
The tech-heavy Nikkei 225 Average jumped more than 1.2 per cent in the first hour of trading on Monday, passing the 67,000-point level for the first time. It is now up almost 30 per cent since the start of 2026. The broader Topix index was trading roughly flat by lunchtime on Monday but up 13 per cent so far this year.
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