Nikkei Jumps 1,378 Points as Chip Shares Lead Rebound

The broader TOPIX rose 22.57 points to 4,125.80, gaining less than the Nikkei as the day’s rally was concentrated in high-priced technology shares. The Prime Market had 630 gainers, 883 decliners and 36 unchanged, showing that the strength in the benchmark index masked a weaker underlying market.

The Nikkei opened higher after U.S. semiconductor shares rose at the end of last week and Chicago Nikkei futures traded above the Osaka close. The index began at 65,600.42, up 579.48 points, and extended its gains through the morning as investors bought major AI and chip-related names.

The benchmark finished the morning at 66,460.11, up 1,439.17 points, and briefly climbed more than 1,600 points before the rally lost some momentum. Even after the late fade, the Nikkei held most of its gains and closed near 66,400.

Nikkei CNBC-style market commentary would focus on the narrow but powerful nature of the rally. The headline index rose strongly, but the number of declining stocks exceeded gainers, showing that investors were buying a small group of large, liquid, AI-related shares rather than the broader Japanese market.

The day’s biggest theme was renewed appetite for semiconductor shares. U.S. chip stocks strengthened at the end of last week, and that momentum carried into Tokyo. Investors bought names tied to AI processors, chip testing, memory, electronic components, optical fiber and data-center infrastructure.

Tokyo Electron rose strongly, while Renesas Electronics gained 3.1% and Rohm climbed 7.8%. Their gains reflected renewed confidence in Japan’s role in the global semiconductor supply chain after several weeks of sharp swings in AI-related stocks.

Advantest was another central driver of the Nikkei. Because of its large weighting in the price-weighted index, the chip-testing equipment maker can move the benchmark significantly when investors return to AI semiconductor names. Its strength showed that traders were again willing to buy companies directly exposed to advanced chip production.

SoftBank Group also supported the index. The company remains one of Tokyo’s most visible proxies for global artificial intelligence investment because of its exposure to OpenAI, Arm, robotics, digital infrastructure and other large-scale technology themes. Its large Nikkei weighting makes it especially important during AI-driven rallies.

Kioxia Holdings was heavily traded and remained one of the key gauges of memory-sector confidence. The company has become a barometer for high-bandwidth memory, AI servers and data-center demand, but its share price has been extremely volatile through August and early September.

Fujikura, Furukawa Electric, Ibiden, Taiyo Yuden, Murata Manufacturing, Lasertec and Kokusai Electric also remained closely watched. These companies represent different parts of the AI supply chain, from optical fiber and cables to electronic components, advanced substrates, chip equipment and power-related systems.

The rally showed that investors still believe the AI investment cycle has strength, even after the sharp selloffs seen in late August and early September. However, the poor market breadth showed that confidence has not fully returned to the overall market.

The contrast between the Nikkei and TOPIX was important. The Nikkei was lifted by a relatively small group of high-priced technology names, while TOPIX was held back by weakness in banks, financials, some defensive shares and other sectors that had performed well during the recent rotation away from AI.

This pattern reversed part of the market behavior seen in late August, when TOPIX often outperformed as investors bought banks, utilities, trading houses and value shares while selling expensive semiconductor names. On September 7, money moved back into the AI-heavy Nikkei.

Still, investors did not appear to be making a broad risk-on bet. The majority of Prime Market stocks declined, suggesting that the market was rotating within equities rather than expanding exposure across the board.

The weakness beneath the surface reflected continuing concern over interest rates, oil prices, inflation and Bank of Japan policy. Investors bought AI and semiconductor shares because of global technology momentum, but they remained cautious toward sectors exposed to higher borrowing costs, weaker consumption or margin pressure.

The yen traded around the 156-yen range against the dollar, supported by expectations that the BOJ may raise rates at its September 17-18 meeting. Reuters reported that markets were pricing a 75% chance of a quarter-point rate increase on September 18, with a 60% probability of another move by December.

That shift in rate expectations has become one of the most important forces in Japanese markets. A stronger yen helps reduce imported inflation pressure, but it also reduces the currency tailwind that had supported exporters earlier in the summer.

For exporters, the yen around 156 is still weak by historical standards, but it is stronger than the levels near 160 and 164 that had supported overseas earnings expectations. Automakers, machinery makers and electronics companies now face a more complicated currency environment.

For households, yen strength is helpful because it can reduce the cost of imported food, fuel, raw materials and consumer goods. However, prices remain elevated, and consumers are still sensitive to grocery, gasoline, electricity, transport and service costs.

The currency story was also shaped by Japan’s latest foreign-reserve data. Reuters reported that Japan’s foreign reserves posted their largest-ever monthly drop in August after Tokyo carried out another round of record dollar-selling, yen-buying intervention to support the currency.

The data reinforced the scale of Japan’s effort to halt yen weakness. The yen had weakened toward 160 after the intervention but later recovered to the 155-to-156 range in early September as expectations for a BOJ rate hike strengthened.

The market increasingly sees monetary policy, rather than intervention alone, as the main tool for stabilizing the yen. That view has intensified after comments from policymakers and advisers suggesting that the BOJ may have a narrow window to raise rates this month.

Takuji Aida, an economic adviser to Prime Minister Sanae Takaichi and a reflationist previously seen as cautious about rate hikes, said the BOJ is likely to raise interest rates in September and continue hiking roughly once a quarter until January. His comments drew attention because they suggested that even some traditionally dovish voices now see a case for tighter policy.

Aida said September may be a narrow window for a rate increase before an extraordinary parliamentary session convenes in early October. That added to the sense that the September 17-18 meeting has become the central domestic event for markets.

The BOJ kept its policy rate at 1% at its July 30-31 meeting, but board member Hajime Takata dissented in favor of raising it to 1.25%. Since then, inflation signals, producer-price pressure, the weak yen and high oil prices have pushed investors toward expecting another move.

The central bank’s challenge is that inflation pressure remains high while parts of the real economy remain uneven. Japan’s services sector has shown resilience, but private consumption and capital spending weakened in recent GDP data. A rate hike would need to be framed as a response to durable inflation and wages, not only currency pressure.

Japanese government bond yields remain another key risk. The 10-year yield recently moved above 3% for the first time in about three decades, forcing investors to reassess equity valuations, government debt-servicing costs and the sustainability of fiscal policy.

Higher yields usually pressure technology shares because they raise the discount rate applied to future profits. The fact that AI and semiconductor shares rose strongly on September 7 shows that technology momentum can still overcome rate pressure on certain days, but the broader market’s weak breadth suggests investors remain cautious.

The bond market also has fiscal implications. Prime Minister Takaichi’s government is pursuing a large-scale investment agenda while also facing pressure to support households. Rising yields make it harder to finance both without increasing concern over Japan’s public debt.

The government’s growth strategy calls for more than 370 trillion yen in public and private investment through fiscal 2040, targeting semiconductors, artificial intelligence, energy security, defense, shipbuilding, robotics, space and other strategic sectors.

That strategy supports many of the companies investors favored on September 7, including semiconductor equipment makers, materials suppliers, data-center infrastructure companies, power-system firms and advanced manufacturers. But bond investors are increasingly demanding fiscal credibility.

The Finance Ministry’s budget process remains closely watched after ministries and agencies submitted large requests for the next fiscal year. Rising debt-servicing costs have made the assumed interest rate used in budget calculations a major issue for markets.

Higher government borrowing costs could limit the room for household relief, defense spending and strategic industrial investment. That tension is becoming more important as the BOJ moves further away from ultra-low rates.

Oil prices remained a major external risk. Reuters said rising oil prices, Middle East conflict and political uncertainty in Europe kept investors cautious globally. Higher energy prices increase inflation pressure and can force central banks to tighten policy at the same time.

For Japan, oil is especially important because the country imports most of its energy. Higher crude prices raise costs for gasoline, electricity, aviation fuel, shipping, logistics, chemicals and manufacturing. The impact is amplified when the yen is weak.

Even with the yen stronger near 156, oil prices remain high enough to pressure companies and households. Resource shares can benefit from higher crude, but the broader Japanese economy usually suffers through higher import costs and weaker household purchasing power.

The Middle East remains the biggest energy-market risk. Conflict around Iran and concern over shipping routes have kept investors alert to any renewed disruption that could push oil prices higher and revive the imported inflation shock that unsettled markets earlier in the summer.

The global backdrop was mixed. AP reported that Asian shares were mixed, with Tokyo and Seoul leading gains because of buying in chipmaker shares. South Korea’s Kospi jumped 4.6%, giving additional support to Japanese semiconductor names.

The South Korean market remains highly important for Tokyo. Overseas investors increasingly treat Japanese semiconductor equipment makers, South Korean memory producers, Taiwanese foundries and U.S. AI shares as one connected technology trade. When Seoul rallies, Tokyo’s chip complex often receives support.

The link was visible again on September 7. Strong buying in South Korean chipmakers helped reinforce demand for Japanese AI-related shares, particularly companies tied to memory, testing, equipment and data-center infrastructure.

U.S. markets provided a mixed signal. On September 4, the Dow Jones Industrial Average fell 271.86 points to 53,414.25, while the Nasdaq also declined. Despite that, U.S. semiconductor strength and futures positioning helped support Tokyo at the start of the new week.

Investors also remained focused on U.S. inflation data due later in the week. Reuters said last week’s U.S. payrolls report exceeded expectations, with August payrolls rising by 162,000, increasing expectations for another Federal Reserve rate hike.

Markets were pricing about a 58% chance of a Fed hike at the September 16 meeting and a 70% chance of a move in October. That matters for Japan because higher U.S. rates support the dollar and can put renewed pressure on the yen.

At the same time, if both the Fed and the BOJ are expected to raise rates, the dollar-yen reaction becomes less straightforward. Reuters noted that the dollar received little lift from stronger Fed hike expectations because investors also expect other central banks, including the BOJ and European Central Bank, to tighten as inflation risks rise.

This is a difficult environment for equities. Higher rates in several major economies reduce support for risk assets, but they can also stabilize currencies and reduce imported inflation pressure. The market reaction depends on whether investors focus more on earnings growth or higher discount rates.

On September 7, the answer in Tokyo was clear at the index level: investors focused on the earnings and demand outlook for AI and semiconductor names. But the weak breadth showed that many investors were not yet ready to buy the full market.

Household and business cost pressures remain central to the domestic story. Companies are still deciding how much of higher labor, energy, logistics and materials costs can be passed on to consumers, while households are judging the economy by whether wage increases cover daily expenses.

Businesses with pricing power, strong brands, stable demand or exposure to long-term investment remain better positioned. Firms without pricing power remain vulnerable if oil stays high, wages keep rising and consumers resist further price increases.

Software, systems integration and corporate digital-transformation shares also remain important after recent U.S. software rallies. Investors are reassessing whether AI will hurt traditional software companies or help them improve productivity, margins and customer offerings.

That theme may continue supporting Japanese IT names such as NEC, Fujitsu, Nomura Research Institute, Obic and Money Forward, although on September 7 the strongest buying was centered more clearly on semiconductor and AI hardware.

Defense and heavy-industry shares also remained in focus after recent gains in Mitsubishi Heavy Industries and IHI. These companies sit at the intersection of Japan’s defense buildup, energy security, aerospace, infrastructure and long-term industrial policy.

Trading houses remained important as a broader value and resource theme. Mitsubishi Corp., Mitsui & Co., Itochu, Sumitomo Corp. and Marubeni continue to attract investor attention because of their global cash flows, commodity exposure, shareholder returns and governance reforms.

However, the day’s weak market breadth suggested that value and defensive sectors were not the main source of the rally. Investors were primarily buying the Nikkei through AI-linked heavyweights.

What to watch next: whether the Nikkei can hold above 66,000 and move back toward 67,000, whether TOPIX can regain stronger momentum, and whether the next rally broadens beyond semiconductor and AI-related shares.

Investors will also monitor whether market breadth improves. A rally driven by only a few high-priced stocks can lift the Nikkei quickly, but it remains vulnerable if investors take profits in Advantest, SoftBank Group, Tokyo Electron, Kioxia, Fujikura, Furukawa Electric or other AI-related names.

The yen around 156 to the dollar remains a central macro signal. Further yen strength would ease imported inflation and reduce intervention risk, but could weigh on exporters. A renewed move toward 160 would revive intervention speculation and increase pressure on the BOJ.

The September 17-18 BOJ meeting is now the key domestic event. A rate increase to 1.25% is largely priced in, but markets will focus on the guidance for later moves and whether policymakers signal another hike by December.

The 10-year JGB yield’s distance from 3% remains another critical marker. If yields rise clearly above that level again, equity valuations, mortgages, corporate borrowing and the budget process could come under renewed pressure.

Other key factors will be U.S. CPI and PPI figures later this week, the September 16 Federal Reserve meeting, oil prices, Middle East developments, South Korean semiconductor shares and any new comments from BOJ Governor Kazuo Ueda or Finance Minister Satsuki Katayama.

September 7 showed that Tokyo’s AI trade remains powerful enough to lift the Nikkei by more than 1,300 points in a single session, but the weak breadth showed that confidence in the broader market remains limited. The next stage of trading will depend on whether semiconductor momentum can survive rising oil prices, global rate-hike expectations and the BOJ’s most closely watched meeting of the year.

Source: CNBC