Asian stocks tumbled after hotter U.S. inflation data sparked a Wall Street sell-off and raised doubts over AI-fueled spending, with tech-heavy Japan and South Korea leading losses.
Asian equity markets sank sharply on Thursday, tracking an overnight retreat on Wall Street after new U.S. inflation data came in hotter than investors had anticipated and raised fresh doubts about the pace of spending tied to artificial intelligence.
In early trading, South Korea’s KOSPI slid more than 7%, one of the steepest moves among major regional benchmarks. Japan’s Nikkei 225 also fell heavily, down about 4%, as selling pressure intensified in shares linked to technology and other growth sectors.
The drop across Asia followed a broad decline in U.S. stocks after the latest U.S. consumer price index showed inflation picked up in September compared with the prior month. The stronger reading unsettled markets that had been leaning on the idea that price pressures were steadily easing—an assumption that has helped support valuations for fast-growing companies and other risk assets.
Investors have been especially sensitive to inflation surprises because they can influence the Federal Reserve’s next steps on interest rates. Higher or stickier inflation increases the risk that borrowing costs stay elevated for longer, which typically weighs on tech and other sectors where a large share of expected earnings lies further in the future.
At the same time, markets have been grappling with concerns around the financial underpinnings of the artificial intelligence boom. As companies race to build out AI capabilities—buying advanced chips, securing data-center capacity, and funding power-hungry computing infrastructure—questions are growing about how much debt is being taken on, how quickly investments can translate into revenue, and whether some expectations have outrun near-term fundamentals.
Those crosscurrents—renewed inflation anxiety and uncertainty about AI-related investment—combined to pressure Asian markets at the open, with the region’s tech-heavy indices particularly exposed. Thursday’s moves underscored how quickly sentiment can shift when investors reassess both the trajectory of U.S. prices and the sustainability of the spending wave that has fueled parts of the global technology rally.
Why it matters
The sell-off highlights Asia’s vulnerability to changes in U.S. inflation expectations, which can ripple quickly through currencies, bond yields, and equity valuations. Tech stocks, a major weight in Japan and South Korea, are especially sensitive to the prospect of higher-for-longer interest rates and to doubts about whether AI investment will deliver returns on schedule. What happens next will hinge on upcoming U.S. economic data and signals from central banks, as well as any evidence that AI spending is either accelerating sustainably—or starting to strain balance sheets.