Chip Rout Halts KOSPI as China Outperforms on Rate Cuts

Key points

• South Korea’s KOSPI index closed 5.3% lower, triggering a sell-side trading curb after Samsung Electronics and SK Hynix dropped 7.6% and 9.5%, respectively.
• The semiconductor sell-off was driven by disappointing earnings from Qualcomm and Arm Holdings, reviving concerns about AI investment returns and smartphone demand.
• China’s Shanghai Composite rose 0.1% and the Hang Seng index jumped 3.6%, supported by a 25 basis point cut in the People's Bank of China’s relending facility rate for share buybacks.
• Brent crude oil prices fell 8.7% to $94.62 per barrel, reaching two-month lows, which boosted bond markets and risk assets outside the tech sector.
• Australia’s S&P/ASX 200 rose 2.6% after September trade data showed a goods surplus of A$2.83 billion, far exceeding expectations.

Background

This volatility follows a period of intense semiconductor weakness. In October 2026, the KOSPI hit six-month lows twice, triggering circuit breakers due to fears over AI financing sustainability and rising competition from Chinese memory chipmakers. Recent rebounds have been fragile, with markets remaining sensitive to global tech sentiment and inflation data.

How outlets are covering it

Investing.com highlights the immediate panic in chip stocks and the broad market relief from falling oil prices. In contrast, Asia Times argues that the initial sell-off was an overreaction. While acknowledging legitimate concerns about data center costs, Asia Times suggests the Democratic control of Congress will weaken the dollar and lower U.S. interest rates, creating a long-term tailwind for Asian currencies and emerging market equities. Investing.com focuses on the day’s losses, while Asia Times emphasizes the structural benefits of a weaker dollar for the region.

Why it matters

The divergence between Asian markets illustrates how regional policy can offset global tech trends. China’s proactive rate cuts and support for domestic chipmakers allowed its markets to outperform, while South Korea and Japan suffered due to heavy exposure to global semiconductor supply chains. The drop in oil prices also reduces inflationary pressure, potentially allowing Asian central banks to ease monetary policy.

What to watch

Investors will watch for further moves in the U.S. dollar and Treasury yields, which influence capital flows into Asia. The impact of new U.S. congressional policies on data center costs and trade tariffs will be critical for Asian chipmakers. Additionally, the sustainability of the oil price decline will determine the extent of inflation relief in the coming months.