The Asia tech sell-off Kospi crisis intensified on Monday as Asian markets opened sharply lower, with South Korea’s stock market plunging so severely that it triggered an emergency trading halt. The rout followed a steep decline on Wall Street and was compounded by fresh geopolitical shocks in the Middle East.

South Korea Bears the Brunt

The damage in South Korea was dramatic. Within three minutes of Monday’s open, the benchmark Kospi had plunged nearly 9%, triggering a circuit breaker. The benchmark sank around 8.4% to roughly 7,477 after opening, halting trading for 20 minutes after a US-led semiconductor sell-off battered Asian markets.

This marked a significant milestone for the worst of reasons — it was the third time a circuit breaker had been triggered this year. The smaller-cap Kosdaq index also tumbled, dropping more than 7%.

A key reason for the severity lies in the Kospi’s makeup. Samsung Electronics and SK Hynix both fell about 10% intraday, and because the two chipmakers dominate the Kospi, their losses dragged the whole index lower.

The picture did shift over the course of the session. After trading resumed, losses narrowed, with the Kospi down by about 5% at one point, though selling pressure later intensified again. The index was left down roughly 15% from its recent peak, putting it on track for a technical correction after what had been a standout year of record gains.

The Sell-Off Spreads Across Asia

The turmoil was not confined to Seoul. Japan’s market took a substantial hit as well, with the Nikkei 225 sliding around 4% — its worst showing in three months — as shares of major tech companies fell. The broader Topix index also declined.

The Wall Street Trigger

The Asian rout was set in motion by a brutal session on Wall Street. On Friday, the Nasdaq Composite plunged 4.18% to 25,709.43, marking its steepest one-day decline since April 2025. The blue-chip S&P 500 also dropped sharply, snapping a multi-week winning streak.

Several forces converged to spook investors:

• AI valuation fears: Investors have been repositioning amid concerns that AI investment may be overvalued, raising the “burden of proof” on real revenue. What began as a wobble in AI valuations had become a full-blown rout.
• Interest rate worries: Stronger-than-expected US jobs data fueled concerns about a prolonged period of high interest rates.
• A chip guidance miss: Broadcom’s AI chip sales guidance reportedly fell short of expectations, adding to the pressure on semiconductor names.

Geopolitics Adds Fuel to the Fire

The market jitters were further amplified by escalating tensions in the Middle East. Oil prices rose on Monday after Iran and Israel exchanged strikes for the first time since a ceasefire was agreed between the sides and the US in April.

The energy move was significant: Brent crude jumped 3.7% to $96.50 a barrel in Asia, while US-traded crude rose around 4% to $94.10 after the strikes were exchanged. Rising oil prices stoke inflation concerns, which in turn reinforce fears that interest rates may stay elevated.

Official Response and a Note of Optimism

South Korean authorities moved to project calm. The Korea Exchange convened an emergency meeting to assess the volatility and discuss steps to maintain stable market operations, while financial authorities pledged intervention.

There were also some bullish voices amid the gloom. Nvidia chief Jensen Huang, who was in South Korea announcing fresh AI partnerships — including collaborations with LG Group and SK Group on humanoid robots, data centers, and other ventures — brushed off the sell-off as a buying opportunity, insisting that the future of AI is very bright. South Korea’s president likewise argued that domestic shares remained slightly undervalued.

Not All Markets Followed

Interestingly, the slide was not universal. Cryptocurrencies broke from the equity slump on Monday, with Bitcoin and Ethereum both posting gains over a 24-hour period — though Bitcoin still remained well below its October 2025 record. US futures also offered a tentative sign of stabilization, with S&P 500 and Nasdaq futures posting small rises even as Asian cash markets fell.

What to Watch

This remains a developing story, and the numbers have been shifting rapidly throughout the trading day. The central question for investors is whether the recent AI-driven repricing represents a temporary unwinding of an overheated rally or a deeper reassessment of growth assumptions in the semiconductor cycle. With geopolitical risk elevated, interest rate expectations in flux, and Asian indices heavily concentrated in a handful of chipmakers, volatility looks set to persist in the sessions ahead.