Asia Stock Market Sell-Off: Kospi, Nikkei Plunge on Tech Rout

The Asia stock market sell-off deepened sharply on Thursday, October 15, 2026, as markets in South Korea and Japan sank under a wave of technology selling triggered by hotter-than-expected US inflation data. South Korea's benchmark Kospi index lost 7.7 percent to 5,548.78, while Japan's Nikkei 225 tumbled 4.8 percent to 64,489.06 in a brutal session for the region's chip-heavy markets.

The trigger came from Washington, where data released on Wednesday showed US consumer prices rising 3.7 percent year on year in September, up from 3.4 percent in August and worse than economists had expected. The reading revived fears of further Federal Reserve interest rate hikes and hammered AI-linked stocks on Wall Street, with the Nasdaq falling 1.9 percent, Nvidia losing 3.2 percent and AMD sliding 5.7 percent. Asian markets followed that lead overnight.

Kospi Crash and Nikkei Plunge Hammer Chip Giants

In Seoul, the rout centred on memory chipmakers: the Samsung SK Hynix pair led declines as Samsung Electronics slid 9.5 percent and SK Hynix plunged 11.4 percent, dragging the Kospi far below the 9,000 mark it touched in June at the height of the artificial intelligence frenzy. Some reports put the day's Kospi decline near 8 percent, with the Korea Exchange forced to suspend programme sell orders after the index breached a 5 percent fall threshold.

Tokyo fared little better in the Nikkei plunge. SoftBank Group, a major investor in OpenAI, lost 9.4 percent, chip equipment maker Tokyo Electron dropped 7.3 percent and memory chipmaker Kioxia Holdings fell 11.2 percent. The Nikkei's losing streak extended as investors priced in weaker demand for chips and chipmaking equipment.

The pain spread across the region. Taiwan's Taiex fell 3 percent, with TSMC down 2.2 percent ahead of its earnings report, while Hong Kong's Hang Seng dropped 1 percent, the Shanghai Composite slipped 1.4 percent and Australia's S&P/ASX 200 edged down 0.1 percent.

Asia Stock Market Sell-Off: What Analysts Are Saying

Analysts say the core problem is a mismatch between lofty market expectations for technology earnings and what companies may actually deliver. For heavily technology-weighted markets such as Korea and Taiwan, any risk to perceived AI spending growth can quickly translate into slower expected demand for chips and equipment, according to Morningstar's Asia equity research team.

There was one bright spot in the gloom of the tech stocks rout. TSMC reported better-than-expected quarterly profit on Thursday and said demand for artificial intelligence remained very strong, a signal that the underlying chip cycle may be healthier than the market's panic suggests.

For Indian investors watching the Kospi crash, the contrast was striking. While Seoul and Tokyo sank in the tech stocks rout, Indian benchmarks rallied more than 2 percent on strong IT earnings and domestic buying, underlining how different market drivers can be across the region. Still, sustained foreign selling and fragile global sentiment mean Indian equities are unlikely to stay immune if the rout continues.

Whether the tech stocks rout marks the start of a deeper correction or a sharp but short-lived reset will depend on upcoming earnings from the region's chip giants, with the Samsung SK Hynix reports in focus, and the next round of US inflation data.