The KOSPI index plunged 41% in just 40 days from its June peak, marking the fastest major sell-off in South Korean stock market history. This steep decline was driven primarily by the heavy weight of semiconductor companies, export sensitivity, and leveraged trading pressures.

Rapid Plunge Amid Semiconductor Worries

Unlike previous major downturns, which unfolded over months or years, this crash happened at an unprecedented speed. South Korea’s KOSPI had suffered three significant crashes in the past 30 years: a 76% drop during the 1997-1998 Asian financial crisis, a 57% fall in 2008 triggered by the global financial crisis, and a roughly 44% slide between 2018 and 2020 amid the US-China trade war and the pandemic. But none matched this latest plunge, which wiped out nearly half the index’s value in just over a month.

The sell-off intensified after doubts emerged about the profitability of AI-related semiconductor investments. Samsung Electronics and SK Hynix, which together compose a large portion of the KOSPI, sparked investor concern as competition increased in the memory chip sector. This led to margin calls and automated selling, exacerbating the drop.

Strong Earnings Spark a Sharp Rebound

Following the initial 16% loss over two days, the market rebounded sharply. Samsung Electronics reported a staggering 1,810% year-over-year jump in quarterly operating profit, fueled by demand for AI memory products. SK Hynix's operating profit soared by 557%, with an impressive 76% operating margin, benefiting from its leading position in supplying high-bandwidth memory chips for AI.

These earnings results challenged the narrative of an industry in crisis and prompted investors to reassess valuations. Melvin from Milk Road noted that earnings expectations outpaced share prices, driving down price-to-earnings ratios and setting the stage for recovery.

The KOSPI’s meltdown and bounce highlight the volatility risks tied to Korea’s reliance on semiconductor exports and the cyclical nature of global tech demand. It also shows how earnings surprises can quickly shift market sentiment in this fast-moving sector.

This content is for informational purposes only and should not be considered financial advice.