The KOSPI opened sharply lower on Thursday, falling approximately 4.46% to 7,933 points [1].
This sudden volatility highlights the fragility of the South Korean market to shifts in U.S. semiconductor sentiment and the perceived efficiency of AI investments. Because the nation's economy relies heavily on chip exports, a downturn in global memory-chip demand can trigger rapid capital flight.
Foreign investors drove the decline by offloading roughly 2 trillion won [1]. This massive sell-off occurred amid concerns regarding falling U.S. semiconductor stocks, specifically Micron, and fears that the efficiency of AI investments might dampen future memory-chip demand [1].
The downward pressure triggered a program-sell-order halt, known as a sell side-car, at 09:07 KST [1]. The halt lasted for five minutes to stabilize the market as indices continued to slide into the 7,700 to 7,800 range [1].
Major technology pillars suffered significant losses. Samsung Electronics dropped more than six percent to the 290,000-won level [1]. Similarly, SK Hynix fell over seven percent to the 2,300,000-won range [2].
While foreign investors sold, institutional and individual investors acted as net buyers [1]. However, this buying was not enough to offset the broader panic. The KOSDAQ also experienced a downturn, falling 2.67% to 904.53 points before sliding further toward the 800 level [1].
“Foreign investors drove the decline by offloading roughly 2 trillion won.”
The activation of the 'side-car' mechanism indicates a level of volatility that exceeds normal trading fluctuations. The concentrated sell-off in Samsung and SK Hynix suggests that global investors are repositioning their portfolios away from hardware-centric AI plays, signaling a potential shift in confidence regarding the immediate returns on AI infrastructure spending.
