TOKYO - Japan's Nikkei Stock Average closed 407.59 points lower at 64,916.70 on October 19, a decline of 0.62%, recovering from an intraday plunge of more than 1,400 points as concerns over artificial intelligence investment weighed on semiconductor and technology shares, while buying in banks, utilities and other domestic sectors helped the broader TOPIX index finish slightly higher.
The decline followed another difficult session for technology stocks in the United States on October 16, when the Philadelphia Semiconductor Index fell 3.8%, extending its losing streak to eight sessions, its longest since 2008. Investors have become increasingly concerned about the enormous borrowing and capital expenditure required to expand AI infrastructure, particularly data centers, and whether future earnings will justify current valuations.
Tokyo Electron, Advantest, Kioxia Holdings and SoftBank Group were among the companies exposed to the selling pressure. The market's recent volatility reflects a reassessment of AI-related valuations after a prolonged period in which semiconductor demand and expectations for AI investment provided major support for Japanese equities.
The Nikkei initially fell by more than 1,400 points, touching an intraday low of 63,831.78. However, buying emerged as the session progressed, helping the index recover above 64,900 by the close. The rebound suggested that investors were becoming more selective rather than abandoning Japanese stocks altogether.
The broader market was comparatively resilient. Although technology shares remained weak, buying in banking, shipping, land transportation and electric utilities helped limit losses. The difference between the Nikkei and the broader TOPIX reflected the heavy influence of semiconductor-related companies on the price-weighted Nikkei benchmark.
The TOPIX closed 1.48 points higher at 4,067.48, a gain of 0.04%, extending its recovery from the previous session. Trading value on the Tokyo Stock Exchange's Prime Market reached approximately 6.78 trillion yen, with 621 stocks advancing and 873 declining. The figures pointed to a market in which weakness remained widespread despite the recovery in the principal indexes.
Restaurant operators were among the stronger performers after Prime Minister Sanae Takaichi indicated that the government was considering measures to stimulate demand in the food-service industry as part of its consumption tax reduction plans. The possible use of premium shopping vouchers encouraged buying in restaurant stocks, including Saizeriya, Create Restaurants Holdings, FOOD & LIFE Companies and Gift Holdings.
The proposed tax changes are becoming an increasingly important factor for investors assessing Japan's domestic economy. Takaichi said on October 19 that the government would not rule out issuing additional bonds to finance a planned two-year reduction in the consumption tax on food beginning in April 2027. The proposal is intended to ease household living costs, although questions remain over its fiscal impact and the government's ability to balance economic stimulus with efforts to contain public debt.
Takaichi emphasized the importance of maintaining confidence in Japan's finances and its currency, arguing that measures to strengthen economic growth would be essential. Investors are watching whether greater fiscal spending will support consumption sufficiently to offset the potential consequences of additional government borrowing.
In the currency market, the yen traded around 158 against the dollar, showing relatively little direction despite the volatility in equities. Japanese government bonds advanced as investors sought comparatively safer assets following the technology selloff. The combination of a weak yen, elevated global energy costs and uncertainty over fiscal policy continued to influence expectations for corporate earnings and inflation.
In corporate developments, Dai-ichi Life Group made a major move to expand its international insurance and asset management operations, proposing to acquire the remaining shares of Australian financial services group Challenger that it does not already own.
Through its Australian subsidiary TAL Daiichi Life Australia, the Japanese insurer offered 11.80 Australian dollars per share, valuing Challenger at approximately 7.94 billion Australian dollars, or about $5.5 billion. The proposal represented a premium of nearly 20% over Challenger's previous closing share price and targeted the approximately 79.5% of the company outside Dai-ichi Life's existing holding.
Challenger, which specializes in retirement income products and investment management, said its board was evaluating the nonbinding proposal. The offer remains subject to due diligence, regulatory approvals and agreement on final transaction terms.
The announcement prompted a sharp increase in Challenger's share price, which climbed more than 19% on October 19 to close at 11.75 Australian dollars, its highest level in approximately eight years.
The potential acquisition highlights the continuing overseas expansion of Japan's major insurers, which are seeking opportunities beyond a domestic market constrained by demographic changes. Australia's retirement savings industry offers access to a growing pool of investment assets and demand for long-term income products.
Challenger also reported a 5% increase in assets under management to 31.9 billion Australian dollars during the first quarter of its fiscal year, supported by strong annuity sales. Total sales increased 52% to 4.4 billion Australian dollars, strengthening the commercial rationale for Dai-ichi Life's proposed expansion.
Elsewhere in the Tokyo market, professional services and consulting companies attracted buying interest. BayCurrent and SHIFT were among the stronger performers, while Recruit Holdings also advanced. Toho gained following its earnings briefing, and shipping companies benefited from renewed demand.
In contrast, electronic components and semiconductor equipment makers remained under pressure. Taiyo Yuden, Lasertec and SoftBank Group were among the notable decliners, reflecting concerns about technology valuations and the investment cycle. Department store operator Takashimaya also weakened despite previously reporting a 3.9% increase in September sales at existing stores.
International developments added to the uncertain trading environment. Chinese economic data showed the world's second-largest economy expanding by 4.5%, providing some reassurance about regional demand. South Korean stocks recovered from recent heavy losses, with the Kospi advancing approximately 1.8%, while European equities traded lower.
Energy markets also remained an important consideration for Japan, which depends heavily on imported oil and gas. Brent crude declined from recent elevated levels following developments surrounding U.S. sanctions on Russia, although continuing Middle East tensions kept attention focused on the risk of renewed supply disruptions.
For Japanese manufacturers, transport operators and household-oriented businesses, the direction of energy prices and exchange rates will remain important to profitability. A sustained increase in imported energy costs could place additional pressure on consumer purchasing power, even if the government's proposed tax reductions provide some relief.
The October 19 session demonstrated the growing divergence between Japanese industries exposed to the global AI investment cycle and companies supported by domestic consumption, infrastructure demand and relatively stable earnings. While the Nikkei remained vulnerable to changes in semiconductor sentiment, the TOPIX's modest advance suggested that investors continued to find opportunities elsewhere in the market.
Attention is now turning toward upcoming corporate earnings in Japan and the United States, particularly announcements from major semiconductor, cloud computing and technology companies. Investors will be looking for evidence that spending on artificial intelligence infrastructure is translating into sustainable revenue growth, while also assessing the implications of Japan's proposed fiscal measures, the yen's movement around 158 to the dollar and the outlook for global interest rates.
