Tech Sell-Off Hits Asian Markets as South Korea's KOSPI Triggers Circuit Breaker, Closes Down 10%
Alina Collins
A global tech sell-off swept into Asia, sending Korea's KOSPI down 10% and triggering a circuit breaker, with SK Hynix falling nearly 10%. This means → the most crowded AI trades are absorbing the sharpest pain first.
Why did Korea take the hardest hit?
The KOSPI closed down 10% at 8,203.84, triggering its circuit breaker — an automatic trading halt designed to prevent panic cascades.
SK Hynix, the AI memory-chip heavyweight and one of the biggest winners of the prior rally, fell nearly 10%.
This reflects a structural vulnerability: SK Hynix-linked ETF assets had swollen to $17 billion, making it the largest ETF product in Hong Kong, per Bloomberg. The more crowded the trade, the more violent the unwind.
Korea's Financial Supervisory Service chief Lee Chan-jin said regulators are assessing stabilization measures, including enhanced monitoring of trading patterns to contain losses from leveraged-ETF volatility.
How far did Japan and the broader Asia-Pacific fall?
The Nikkei 225 closed down 3.5% at 69,788.38, slipping below the 70,000 level; the Topix fell 2.6%.
Kioxia, Japan's memory-chip maker, plunged as much as 16% — its steepest drop since November 2025.
The MSCI Asia-Pacific index fell 3% to 277.27. This means → the sell-off was not a Korea-only event but a region-wide chip-sector retreat.
What was the damage in China and Hong Kong?
The STAR 50 index slid more than 3% in late trading; Montage Technology dropped over 8%. The ChiNext fell more than 4%.
Non-ferrous metals, PCB, optical communication, and solar-battery names led losses; nearly 2,800 stocks fell across Shanghai, Shenzhen, and Beijing exchanges.
In Hong Kong, the Hang Seng Tech index dropped 3% and the Hang Seng fell 1.7%. AI plays MINIMAX tumbled over 18%; Zhipu fell nearly 12%.
How did Europe, the US, and commodities react?
S&P 500 futures fell 0.9%; Nasdaq futures dropped 1.6%. Euro Stoxx 50, DAX, and FTSE futures each slid roughly 1%.
Brent crude broke below $78 a barrel. WTI fell 1% to $73.05. Gold lost more than 1%, silver dropped over 3%, and Bitcoin slid more than 1%.
In plain terms = it was not just equities — oil, precious metals, and crypto all weakened together, signaling a broad-based risk retreat.
What forces are driving this sell-off?
IG International analyst Fabien Yip noted: "Weakness in big-cap tech overnight is pressuring sentiment, and while US-Iran peace talks continue, there remains a fundamental divergence on the terms."
In plain terms = two pressures are compounding — profit-taking on stretched tech valuations, plus unresolved geopolitical uncertainty, amplifying fear in tandem.
What are the key events to watch this week?
Wednesday: Memory-chip leader Micron Technology reports quarterly earnings. Micron has rallied more than 300% year-to-date; the print will test whether AI spending can keep supporting chip stocks.
Bloomberg strategist David Savage warned: "Concerns continue to build over whether the unprecedented AI-infrastructure spending by US hyperscalers is prudent."
Thursday: US core PCE data is released. Global X strategist Billy Leung said: "The real core variable this week is still Thursday's core PCE print."
This means → Micron's earnings will determine whether the AI narrative holds, and core PCE will set Fed rate-cut expectations — together, they will define the market's direction for the rest of the week.
Content is for reference only, not financial advice.