TOKYO - Tokyo stocks rose on August 17, with the Nikkei 225 closing at 69,220.25, up 506.45 points, as buying in artificial intelligence and semiconductor-related shares outweighed weaker-than-expected economic growth, rising bond yields and renewed concern over household spending.
The Nikkei rose for a fifth straight session and recovered the 69,000 level for the first time in about a month and a half. The index briefly slipped into negative territory in morning trading as investors took profits after recent gains, but it strengthened again in the afternoon and finished near the day’s high.
The broader market was less strong than the headline index suggested. Prime Market trading volume totaled about 2.09249 billion shares, with trading value of 8.9492 trillion yen. Only about 40% of Prime Market stocks advanced, while roughly 57% declined, showing that the day’s rally was driven mainly by a narrow group of high-impact technology shares rather than broad buying across the market.
The split between the Nikkei and the wider market was one of the most important features of the session. The price-weighted Nikkei was lifted sharply by semiconductor and AI-linked heavyweights, while many domestic-demand, pharmaceutical, wholesale and consumer-related shares fell.
Nikkei CNBC-style market commentary centered on the continuing strength of the AI trade. Despite weaker U.S. consumer indicators and a softer Wall Street session before the weekend, investors continued to buy Japanese companies tied to AI servers, high-bandwidth memory, chip testing, semiconductor equipment, optical fiber and data-center infrastructure.
The rally showed that money is still flowing into companies with direct exposure to the AI investment cycle. Investors remain concerned about valuations after the July correction, but they are also willing to buy stocks where earnings expectations remain strong or where demand from data centers appears durable.
Advantest was the largest positive contributor to the Nikkei, lifting the index by about 219 points on its own. The chip-testing equipment maker rose 910 yen to 37,780 yen, supported by continued demand expectations for advanced semiconductors used in AI processors and high-performance computing.
Kioxia Holdings was the second-largest contributor, adding about 190 points to the Nikkei. The memory-chip maker surged 8,100 yen to 61,840 yen, reinforcing its role as one of Tokyo’s most closely watched indicators of confidence in AI servers, high-bandwidth memory and data-center investment.
Kioxia’s recovery was especially important because the stock had been at the center of the late-July AI selloff. Its recent rebound has helped restore confidence in Japan’s semiconductor complex, although investors remain alert to the risk of renewed profit-taking after such a sharp move.
SoftBank Group also supported the index, rising 147 yen to 5,886 yen and adding about 118 points. The company remains a major proxy for global AI investment sentiment because of its exposure to OpenAI, robotics, digital infrastructure and other large-scale technology themes.
Tokyo Electron rose 960 yen to 60,090 yen, contributing about 96 points to the Nikkei. The semiconductor-equipment maker remains one of Japan’s most important links to global chip capital spending, and its recovery signaled renewed confidence that AI-related investment will continue supporting orders.
Fujikura gained 413 yen to 6,078 yen, while Ibiden rose 795 yen to 21,580 yen. Their gains showed that the AI trade continues to broaden beyond chipmakers and equipment makers into optical fiber, cables, advanced packaging, substrates and power-related infrastructure.
TDK, Fanuc, Sumitomo Electric, Ajinomoto, Taiyo Yuden, SCREEN Holdings, Furukawa Electric, Rohm, Mitsui Mining & Smelting, NGK Insulators, Daikin Industries, Nissan Chemical, Sumitomo Metal Mining and Lasertec also supported the index.
The strongest sectors included nonferrous metals, marine transportation, glass and ceramics, and metal products. Their gains reflected buying in materials, shipping, infrastructure and AI-related supply chains, while investors continued to seek companies linked to electrification, data centers, advanced manufacturing and global capital spending.
The market also drew support from company-specific earnings expectations. With the main earnings season largely complete, investors continued to direct money toward companies that had delivered positive surprises, raised forecasts or showed clear exposure to structural growth themes.
The negative side of the market was broader. Fast Retailing was the largest negative contributor to the Nikkei, subtracting about 24 points. Sony Group, KDDI, Nitto Denko, Trend Micro, Terumo, Konami Group, Ebara, Astellas Pharma, Itochu, Bandai Namco Holdings, Ryohin Keikaku, Kyocera, BayCurrent, Dentsu Group, Nomura Research Institute, Fujifilm, Asahi Group and Mercari also declined.
The weakness in consumer, pharmaceutical, communications, wholesale and services names suggested that investors were rotating aggressively toward AI and selected cyclicals rather than buying the whole market. It also showed concern that Japan’s domestic demand remains fragile.
Japan’s GDP data provided the main economic caution. Government figures showed that the economy grew at an annualized rate of 1.1% in the April-June quarter, below the 2.0% forecast and slower than the revised 1.9% growth in the previous quarter.
Private consumption fell 0.02%, the first decline in eight quarters, while capital spending dropped 1.2%, against expectations for a rise. The figures pointed to softness in household and business spending even as exports remained resilient.
The weakness in consumption was partly attributed to one-off factors, including lower school fees paid by households because of subsidies, which mechanically reduced private consumption while lifting government spending. Even so, the data highlighted the pressure on consumers from higher living costs.
Exports remained a bright spot, supported by U.S. demand for Japanese hybrid vehicles and continued global investment in artificial intelligence. Shipments of semiconductor-related equipment and components helped offset weakness in domestic demand.
Net external demand added 0.5 percentage point to growth, helped partly by a decline in imports after temporary disruptions to crude oil shipments through the Strait of Hormuz. That made the headline growth figure less comforting than it appeared because much of the contribution came from the external side rather than broad domestic strength.
Economy Minister Minoru Kiuchi said the economy remains on a moderate recovery path, with export-driven growth offsetting weakness in domestic demand. That assessment is consistent with the equity market’s behavior: exporters, AI suppliers and global-cycle companies are leading, while household-facing sectors remain less convincing.
TV Tokyo’s broader business themes remain closely tied to the GDP data. Households are still facing higher prices for food, fuel, electricity, transport and daily services, while wage increases have not fully removed anxiety over real purchasing power.
Recent real-wage gains have helped, but the August 17 GDP data showed that consumption is still vulnerable. The government has relied on subsidies and relief measures to cushion households, but economists warn that support may fade while inflation pressure could intensify again from autumn.
The Bank of Japan’s policy outlook became more complicated. Weak private consumption and falling capital spending would normally argue for caution, but bond markets focused instead on inflation risks, yen weakness and the possibility that the BOJ will need to raise rates soon.
The benchmark 10-year Japanese government bond yield rose for a sixth straight session and reached 2.925%, its highest level in about three decades. The move brought the yield close to the psychologically important 3% level, increasing concern over government financing costs and equity valuations.
Higher yields can weigh on stocks by making equities look less attractive relative to bonds and by increasing the discount rate applied to future earnings. That is especially important for high-growth technology shares, although on August 17 the AI rally was strong enough to overcome the pressure.
Shorter-dated yields also remained sensitive to BOJ expectations. Markets are increasingly focused on whether the central bank could raise its policy rate from 1% to 1.25% at its September 17-18 meeting, after policymakers warned that underlying inflation could exceed the 2% target.
The BOJ kept rates unchanged at its July 30-31 meeting, but board member Hajime Takata dissented in favor of an immediate hike. Since then, hawkish comments from policymakers, elevated producer prices, a weak yen and rising oil prices have strengthened expectations for a near-term move.
The yen held near the 159 range against the dollar, stronger than its late-July lows near 164 but still weak enough to keep imported inflation in focus. The currency remains one of the most important links between markets, households and BOJ policy.
A weak yen helps exporters and overseas earners but raises the cost of imported fuel, food, raw materials and consumer goods. For households, the currency’s weakness is felt through grocery bills, gasoline prices, electricity costs and imported products.
For companies, the effect depends on business model. Exporters and global manufacturers benefit from translation gains, while retailers, food companies, logistics operators, utilities and smaller firms face higher costs and pressure on margins.
Prime Minister Sanae Takaichi’s government is trying to balance household relief with long-term investment. The administration is promoting 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 sectors leading the stock market, especially semiconductor equipment, AI infrastructure, power systems, materials, cables and advanced manufacturing. However, investors remain sensitive to how the program will be funded at a time when JGB yields are rising.
Household relief measures, including food-related support and subsidies, could help consumption but may also raise questions about fiscal discipline. The bond market’s move toward 3% shows that investors are becoming less willing to ignore Japan’s public-debt burden.
Oil remained an important external risk. Brent crude traded near the high-$80 range as Middle East tensions continued and the Strait of Hormuz remained central to supply concerns. For Japan, which imports most of its energy, any renewed oil shock would feed quickly into inflation, the trade balance and household costs.
Reuters reported that the Iran conflict and higher fuel costs continue to cloud Japan’s outlook. Economists warned that a weak yen and higher crude import costs could lead to broader price increases from autumn, even if subsidies have helped contain consumer inflation so far.
The global backdrop was mixed. U.S. equities weakened before the weekend after weaker retail sales and consumer-sentiment data raised concern about the strength of American spending. At the same time, softer U.S. data reduced expectations for another Federal Reserve rate increase, supporting technology valuations.
South Korea’s stock market was closed for Liberation Day, which may have concentrated regional AI buying in Tokyo. Market participants noted that Kioxia attracted funds while Seoul was shut, and its strength spread to other semiconductor and AI-related shares.
That cross-market relationship remains important. Overseas investors increasingly treat Japanese semiconductor equipment makers, South Korean memory producers, Taiwanese chipmakers and U.S. AI shares as one connected technology trade. When one part of the chain is closed or under pressure, money can move quickly through the others.
What to watch next: whether the Nikkei can hold above 69,000 and move toward 70,000, whether TOPIX can regain broader momentum, and whether buying in Advantest, Kioxia, SoftBank Group, Tokyo Electron, Fujikura and Ibiden continues without triggering another wave of profit-taking.
Investors will also monitor whether market breadth improves. August 17’s rally was powerful at the index level, but more stocks fell than rose, suggesting that the recovery remains heavily dependent on AI-related heavyweights.
The 10-year JGB yield near 2.925% is another critical signal. A move above 3% could pressure equity valuations, raise fiscal concerns and increase expectations that the BOJ will need to manage market communication carefully.
The yen around 159 to the dollar, oil prices near $90, U.S. retail and inflation data, Middle East developments and Japan’s July CPI release will shape the next stage of trading. August 17 showed that AI optimism remains strong enough to lift the Nikkei, but weak domestic demand and rising bond yields mean the rally is becoming more dependent on a narrow group of growth stocks.
