KOSPI plunges 5%, sell-car activated as 7,000-point level breached again

South Korea's KOSPI index experienced a sharp decline of over 5% in early trading on July 16, 2026, falling below the critical 7,000-point threshold. The market's volatility was underscored by the activation of both buy and sell "side-car" mechanisms, which temporarily halt trading to curb excessive price swings. This marks the 37th instance of such measures being deployed this year, and the third time in the current week alone, highlighting a period of intense market instability.

The downturn was largely driven by a significant sell-off in major semiconductor stocks, which had previously surged on optimistic "super-cycle" forecasts. Samsung Electronics saw its shares drop by 5.72%, while SK Hynix experienced an even steeper decline of 8.41%. Other major companies, including Hyundai Motor, also traded lower.

This domestic market movement appears to be influenced by a broader trend in the global semiconductor sector. Overnight, US-based semiconductor companies like Micron and Sandisk saw substantial losses, with Micron's ADR also falling sharply. Reports suggest that CoreWeave, a company reportedly engaged in long-term supply agreements with these firms for AI infrastructure, is preparing for a potential decline in memory and storage prices, reigniting concerns about a slowdown in the semiconductor industry.

The KOSPI's sharp fall follows a pattern of rapid fluctuations, with the index experiencing both significant gains and losses. The KOSDAQ index also reflected the broader market sentiment, opening lower and extending its decline. The market's reaction suggests that investor confidence is currently fragile, heavily swayed by news and outlooks within the crucial technology sector.