Semiconductor Giants Drive the Slide

The early-session plunge was centered on Samsung Electronics and SK hynix, the two chipmakers that together anchor the KOSPI and are often described in Korean market commentary as the "semiconductor duopoly" (반도체 투톱). As both stocks sank, the benchmark index quickly surrendered ground and slipped into the 5,600 band within the first minutes of the session.

The abrupt opening decline reflects the outsized weight the two chipmakers carry on the Korean benchmark: when both fall in tandem, the index has little cushion elsewhere to absorb the shock.

AI and Chip Sensitivities in Focus

The sell-off comes amid heightened sensitivity around semiconductor and AI-related shares, a sector that has dominated Korean equity trading through 2026. Samsung Electronics and SK hynix, both central to the global memory and AI chip supply chain, have been the primary drivers of the KOSPI's direction this year, making their simultaneous weakness the immediate trigger for the broad opening drop.

Further details on the specific catalysts behind the chipmakers' decline and the magnitude of their individual losses were not available in the material reviewed for this report.

Market Braces for Volatile Session

An early drop of this scale leaves the KOSPI facing one of its steepest single-session declines of the year, with the 5,600 level marking a sharp retreat from recent trading ranges. Whether the index stabilizes through the session or extends its losses depends largely on the recovery of the two semiconductor names that led it lower.

The claim that the KOSPI fell 5 to 6 percent in early trading to the 5,600 range on a "semiconductor duopoly" plunge is True.