Asian Markets Whipsaw After Wall Street's Chip Rout as AI Spending Fears Rattle Seoul and Tokyo

Asian stock markets began the week on a volatile footing on Monday, October 19, as investors digested one of the worst weeks for chip stocks in nearly two decades and growing doubts about the economics of the artificial intelligence boom.

South Korea's Kospi index fell as much as 3.2% at the open, and Japan's Nikkei 225 dropped more than 2% early in the session. Both markets later recovered much of the ground they had lost, with the Kospi swinging between small losses and gains during the day and the Nikkei paring its decline to around 1%. Taiwan's benchmark fell about 1.4%. Hong Kong's market was closed for the Chung Yeung Festival holiday.

The volatility followed a heavy sell-off on Wall Street on Friday, when the Nasdaq Composite dropped 2.1% to 26,140 and the S&P 500 fell 1.1% to 7,659. The Philadelphia Semiconductor Index lost about 11.4% over the week, extending its longest losing streak since 2008.

Korea's chip giants at the centre

South Korea has been hit particularly hard because its market is dominated by the two memory chip giants, SK hynix and Samsung Electronics, which have been among the biggest beneficiaries of AI-driven demand for high-bandwidth memory. Their shares soared earlier in the year, helping drive the Kospi to record highs and attracting heavy foreign investment.

That trade has reversed sharply. The Kospi fell about 14.5% between October 12 and October 16, and foreign investors sold roughly 11 trillion won of Korean shares last week. SK hynix shares fell around 24% over the week and Samsung Electronics about 18%, according to market data. On Monday morning, SK hynix traded around 1,231,000 won and Samsung around 213,500 won.

The sell-off was triggered in part by reports of technological progress at China's ChangXin Memory Technologies (CXMT), the country's largest DRAM maker, which raised concerns that lower-cost Chinese memory chips could erode the pricing power of Korean producers. Han Ji-young, an analyst at Kiwoom Securities, forecast a trading range of 5,200 to 5,900 for the Kospi in the near term, reflecting expectations of continued volatility.

The AI debt question

Behind the sell-off lies a broader concern about how the AI boom is being financed. Technology companies and data centre operators have borrowed heavily to fund the construction of computing infrastructure. The Federal Reserve Bank of Dallas has cited estimates that AI-related investment-grade bond issuance could approach $300 billion in 2026, and syndicated loans have accounted for a large share of data centre financing.

As interest rates have risen, investors have begun to question whether that spending can generate sufficient returns. "The question is shifting from how much AI infrastructure can be built to how profitably it can be operated," one analysis of the sell-off noted. Shares of companies with heavy debt loads and concentrated customer bases have been hit hardest. Oracle fell 8.8% and AI cloud provider CoreWeave fell 15.5% in Friday's trading. Micron Technology lost about 14.6% over the week.

US inflation rose to 3.7% in September, up from 3.4% in August, keeping bond yields high and raising the cost of financing for capital-intensive businesses. The Federal Reserve meets on October 27 and 28, and markets are pricing a high probability that it will hold rates steady.

Oil and geopolitics add to uncertainty

Energy markets added another layer of uncertainty. Brent crude fell about 1.7% to around $108 a barrel on Monday after US President Donald Trump signed an order easing sanctions on Russian energy exports, but Iranian reports of a tanker striking a mine in the Strait of Hormuz kept supply concerns alive. Political uncertainty in France following violent cost-of-living protests also weighed on European futures.

China offered some support. Data showed the Chinese economy grew 4.5% year on year in the third quarter, slightly ahead of forecasts, and retail sales growth beat expectations. China's CSI 300 index reversed early losses to trade higher.

What it means for India

For Indian investors, the turmoil in North Asia cuts both ways. Earlier this year, the AI rally in South Korea and Taiwan drew foreign capital away from India, contributing to record foreign portfolio outflows from Indian equities. A sustained correction in AI-linked markets could, in theory, lead some global investors to rebalance towards markets such as India that have less exposure to AI hardware.

However, sharp falls in global technology stocks also tend to hurt risk appetite more broadly. Indian IT services companies, which earn most of their revenue from clients in the United States and Europe, are sensitive to the outlook for corporate technology spending. On Monday morning, the Sensex was down about 0.4%, led by private sector banks after their results.

A shift in the market narrative

For much of 2026, the dominant narrative in global markets was that AI demand would keep growing for years, supporting the earnings of chipmakers, cloud providers and data centre operators. That narrative pushed valuations to elevated levels, particularly in memory chips, where prices rose sharply as AI servers demanded vast amounts of high-bandwidth memory.

The past week has shown how quickly that narrative can be questioned. Concerns about Chinese competition in memory, rising financing costs and the profitability of AI infrastructure have combined to trigger heavy selling. Some analysts argue the sell-off is a healthy correction after a strong rally, while others warn it could mark the start of a more prolonged reassessment of AI-related valuations.

What to watch

The coming days will bring important tests for the AI trade. Earnings from Meta Platforms, Tesla and major semiconductor companies will be scrutinised for evidence that AI investments are producing sustainable revenue and profit. Comments on capital spending plans will be particularly important: any sign that large technology companies are slowing their investment could hit chipmakers further, while strong demand signals could spark a rebound.

US stock futures pointed higher on Monday, with Nasdaq futures up about 1.2%, helped by lower oil prices and falling Treasury yields, suggesting some investors see the sell-off as an opportunity.

For now, the AI boom that powered markets for much of 2026 faces its most serious test yet. Investors are no longer asking simply how much demand there is for AI chips and data centres, but whether the companies building them can earn enough to justify the enormous sums being spent and borrowed. Until that question is answered, markets from Seoul to New York are likely to remain volatile.