South Korea's benchmark KOSPI index staged a powerful rally, soaring over 5% and reclaiming the 7,000 level for the first time since mid-July. The surge triggered a buy-side sidecar — a circuit breaker that halts program trading for five minutes when KOSPI futures move 5% or more from the previous close. This was the first buy-side sidecar activation in months, underscoring the abruptness of the move.
The rebound was driven by a broad-based recovery in technology and battery stocks, alongside renewed foreign investor buying. Heavyweights like Samsung Electronics and SK Hynix led gains, buoyed by improved global sentiment and expectations of a pause in U.S. interest rate hikes. The rally followed a period of sustained selling pressure that had pushed the index nearly 10% below recent highs, prompting short-covering and institutional rebalancing.
While the sidecar mechanism is a routine market safeguard — not a sign of systemic stress — the magnitude of the move highlights the extreme short-term volatility still present. Analysts caution that sustainability depends on continued investor confidence, upcoming corporate earnings, and global economic data.
