For the second consecutive session, extreme volatility forced South Korean regulators to suspend trading as the KOSPI benchmark plummeted 10%. This deepening rout, fueled by a massive retreat from major semiconductor holdings, has erased more than a fifth of the index’s value within 48 hours.
Exchange authorities were forced to intervene on Wednesday after the KOSPI breached the 8% decline threshold, triggering a market-wide circuit breaker at 12:32 p.m. This automatic 20-minute halt followed earlier “sidecar” restrictions intended to curb program selling. The index eventually settled near 5,425, its lowest point since early April, marking a cumulative two-day collapse of 21%. The KOSDAQ index followed a similar trajectory, dropping over 9% as the sell-off spread to mid-sized firms.
The primary catalyst for the decline was a sharp re-evaluation of the artificial intelligence sector following financial results from SK Hynix. Although the memory chipmaker reported a record operating profit of 60.5 trillion won—a sixfold increase—the figures failed to meet the heightened expectations of market analysts. Consequently, SK Hynix shares dropped more than 10%, while leveraged exchange-traded products tied to the stock saw a massive 32% devaluation in a single day. Samsung Electronics also faced significant pressure, retreating 11.3% as investors anticipated its upcoming earnings report on Thursday.
Investor sentiment was further strained by escalating instability in the Middle East. After the Trump administration reported intercepting an Iranian strike and launching retaliatory actions, Brent crude prices surged past $88 per barrel. These geopolitical tensions contributed to a broader Asian market decline, with Taiwan’s Taiex falling 3.6% and Japan’s Nikkei shedding 1.1%.
Analysts observed that because the KOSPI is heavily weighted toward tech giants like Samsung and SK Hynix, there is little protection for the broader market when these leaders falter simultaneously.
Trading data highlighted a significant divide in market activity. While individual and foreign investors offloaded a combined 2.6 trillion won in KOSPI holdings, institutional buyers acted as a counter-balance, recording net purchases of approximately 2.54 trillion won.
The KOSPI is currently on track to record a monthly loss of approximately 35%, which would represent its most severe monthly contraction on record. Market participants remain focused on Samsung’s impending financial update to determine if the current tech-driven volatility will persist.
