South Korean Stocks Tank 6% as AI Jitters Send Samsung, Chipmakers Reeling

July 5, 2026 4 min read

Seoul's benchmark KOSPI index shed 6% on Tuesday, wiping out billions in market value as a wave of selling swept through South Korean technology stocks. The selloff centred on chipmakers, with Samsung Electronics leading the decline after industry watchers flagged mounting concerns about the sustainability of AI-related demand.

Market Carnage in Seoul

The KOSPI closed at its lowest level in three months, with more than 400 stocks declining for every 80 that managed gains. Trading volume surged to nearly double the 30-day average, suggesting institutional investors were actively rotating out of Korean equities. The Korean won also softened against the dollar, adding to the currency pressures facing exporters in the region.

Samsung Electronics fell sharply during the session, dragging the broader technology sub-index down by 8.4%. Memory chip rival SK Hynix suffered similar losses. Analysts tracking the sector said the move reflected growing scepticism about whether AI infrastructure spending would continue at the pace investors had priced in.

AI Demand Doubts Shake Confidence

The trigger for the selloff appeared to be a shift in sentiment on Wall Street, where some analysts began questioning whether hyperscalers would maintain their aggressive capital expenditure programmes. Reports circulating among market participants suggested a potential slowdown in orders for advanced memory chips used in AI training clusters.

South Korea's chip industry generates roughly 17% of the country's total exports, making the sector a linchpin of the economy. Any sustained pullback in semiconductor demand would ripple through employment, supplier chains, and government tax revenues. Local media outlets carried commentary from fund managers warning that the correction could deepen if order data disappoints in coming weeks.

What Wall Street Said

Federal Reserve official Warsh weighed in on broader market conditions, noting that elevated valuations in technology-linked sectors remained a vulnerability. His remarks, made at a conference in Washington, underscored how the AI trade has become a global focus for monetary policymakers assessing financial stability risks.

Asian markets followed the Korean slide lower, with Taiwan's Taiex off 3.2% and Japan's Nikkei shedding 1.8%. The MSCI Asia Pacific index slid 1.9%, reflecting the broader regional contagion from Seoul's tech-led decline.

Singapore Investors Watch Closely

Singapore's exchange-listed technology counters felt spillover effects, with traction-and-logistics plays tied to semiconductor supply chains among the hardest hit. The city-state's position as a regional financial hub means its fund managers hold significant exposure to Korean equities through Asia-dedicated portfolios. Bloomberg data showed Singapore-based institutional investors had increased their Korea weighting in recent quarters, leaving them exposed to Tuesday's move.

Business Insider reported that retail participation in Korean markets has grown substantially over the past two years, with individual investors accounting for a larger share of daily volume. This demographic shift means sharp drawdowns tend to generate outsized media coverage and social media discussion, amplifying sentiment effects.

Earnings Season in Focus

Samsung is scheduled to release its quarterly earnings guidance in the coming weeks. Analysts expect memory chip division results to show a modest recovery, but the pace of improvement may disappoint investors who built positions expecting a more robust upcycle. SK Hynix, the world's second-largest memory chipmaker, will also report, and its forward guidance will signal whether the AI demand narrative remains intact.

The semiconductor equipment sector, which supplies the fabrication tools used by Samsung and SK Hynix, came under pressure even though these firms are not direct manufacturers. Investors apparently concluded that if end-demand weakens, capital expenditure budgets for new manufacturing capacity would likely be trimmed.

What Comes Next

Market participants will scrutinise U.S. earnings calls from major cloud providers in the next fortnight. Any indication that AI infrastructure spending is being deferred or restructured would likely deepen the selloff in Asian chip stocks. South Korea's finance ministry issued a brief statement saying authorities were monitoring market conditions, stopping short of signalling any intervention readiness.

Traders are now watching for whether Samsung's board considers share buybacks to support its stock price. The company has historically deployed this tool during periods of acute share price weakness, though the scale of Tuesday's decline may prompt deliberation. South Korean regulators have scheduled no immediate policy announcements, but the Bank of Korea's next rate review could be influenced by how the equity market evolves through the end of the quarter.