Japan’s Nikkei Climbs 2.12% as Semiconductor Shares Lift Tokyo Market

September 8, 2026

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Summary

Japan’s Nikkei rose 2.12% to close at 66,399.84, gaining 1,378.90 points. Semiconductor and AI-related shares led the advance after U.S. chip stocks strengthened and Micron signaled increased production of advanced memory. SoftBank Group surged more than 11%, while Kioxia, Advantest and Tokyo Electron also performed well. The index briefly climbed more than 1,600 points before gains narrowed in the afternoon. Despite the Nikkei’s strong performance, more Prime Market stocks declined than advanced, showing that the rally was concentrated in major technology names. TOPIX gained 0.55%, while the Growth Market 250 Index fell 0.65%. Investors are now focused on rising interest rates and this week’s U.S. consumer price index. Click the link for the full breakdown of Japan’s market moves and what they could mean for global investors and residents watching the Japanese economy.

Semiconductor strength drives another advance

Japan’s Nikkei share average continued its upward move on Monday, rising 1,378.90 points, or 2.12%, to close at 66,399.84. The rally was supported by strong gains in semiconductor and artificial-intelligence-related shares, following a rise in U.S. semiconductor stocks at the end of last week.

The index opened 0.89% higher and expanded its gains through the morning session. It reached an intraday high of 66,668.71, up more than 1,600 points, before losing momentum in the afternoon. Trading then became relatively narrow, with the Nikkei moving mainly around the 66,200 level as investors appeared reluctant to extend the rally aggressively.

AI and memory-chip shares in focus

Investor sentiment toward the technology sector was strengthened by reports that Micron Technology plans to increase production of advanced memory products. The news encouraged buying in Japanese companies linked to artificial intelligence, data centers and semiconductor manufacturing.

SoftBank Group, one of the largest contributors to movements in the Nikkei, jumped more than 11%. Kioxia Holdings also advanced sharply, while semiconductor equipment makers Advantest and Tokyo Electron performed well. KOKUSAI ELECTRIC rose significantly, and JX Advanced Metals was firm after both companies were viewed positively in connection with changes to the Nikkei’s constituent stocks.

The gains highlighted the important role Japan’s technology and chipmaking ecosystem plays in the country’s equity market. Japanese firms supply semiconductor manufacturing equipment, materials and memory-related technologies to customers around the world. As global investment in AI infrastructure accelerates, these companies have attracted renewed attention from international investors.

Market breadth remains mixed

Despite the strong rise in the Nikkei, the broader market showed signs of caution. On the Tokyo Stock Exchange’s Prime Market, 633 stocks rose, while 885 declined and 37 were unchanged. More than half of Prime Market stocks fell, indicating that the advance was concentrated in a relatively limited group of large technology companies.

The broader TOPIX index gained 22.57 points, or 0.55%, to 4,125.80. The Tokyo Stock Exchange Prime Market Index rose 0.57% to 2,128.36. Trading value on the Prime Market reached 8.03774 trillion yen, reflecting active participation during the sharp morning advance.

In contrast, growth-oriented shares weakened. The Growth Market 250 Index fell 0.65% to 791.61. Software-related stocks such as Sansan and Money Forward declined sharply, following weakness in software shares in the U.S. market.

Interest rates and U.S. inflation data remain key risks

Market analysts cautioned that the semiconductor rally could face resistance from rising interest rates. Higher rates can increase financing costs and reduce the appeal of growth stocks, particularly companies whose valuations depend on future earnings.

Takayoshi Yoshino, chief market analyst at Monex Securities, said the market was balancing positive company-specific news with concerns over the recent upward trend in interest rates. He suggested that it may be difficult for investors to continue buying aggressively while these conflicting factors remain in place.

Investors are also awaiting the release of the U.S. consumer price index this week. The data could influence expectations for American monetary policy and global bond yields, making traders more cautious in the near term. For Japan, the figures may also affect the yen, overseas investment flows and the outlook for export-oriented companies.

For foreign residents and international investors following Japan, Monday’s session offered a clear example of the market’s current character: Japan’s world-class semiconductor industry remains a powerful source of optimism, but gains are increasingly sensitive to global interest rates and U.S. economic data. The Nikkei advanced strongly, yet the uneven performance across the wider market suggests that investors are watching for confirmation before committing to a broader rally.