South Korea's KOSPI index staged a massive recovery on June 9, climbing 8.2% just a day after a historic 8.8% crash. The reversal was fueled almost entirely by memory chip giants Samsung Electronics and SK Hynix. Samsung shares jumped 9.3%, while SK Hynix, which recently surpassed a $1 trillion valuation, surged 15%. This rebound reversed a three-day selloff that had erased 15% from the index's peak.
The initial panic was triggered by lackluster guidance from US semiconductor maker Broadcom, which rattled the global AI supply chain. However, fundamental demand for high-bandwidth memory chips remains robust.
Korean retail investors paid a heavy price during the volatility. Many had leveraged their bets aggressively, even liquidating personal savings. Analysts warn that the math remains unforgiving; the combined volatility still leaves many investors roughly 8% below their starting point, not accounting for the amplified impact of leverage.
The extreme volatility highlights a structural risk. Samsung and SK Hynix now represent over half of the entire KOSPI index, leaving South Korean markets dangerously concentrated and vulnerable to single-company shocks.