KOSPI tumbles then rebounds 8.18% as Samsung, SK Hynix rally
KOSPI fell June 8 then rebounded 8.18% on June 9 as Samsung Electronics and SK Hynix, which account for about 40% of the index, led a chip-stock rebound.
South Korea’s KOSPI dropped sharply on June 8 and then rose 8.18% on June 9, its largest one-day recovery so far in 2026. Samsung Electronics and SK Hynix were the main drivers; together they represent roughly 40% of the benchmark.
Samsung fell 10.2% on June 8 and recovered about 9% the following session. SK Hynix slid 7.7% before jumping 16.01% on June 9. Other semiconductor names moved higher overnight, with gains in U.S. chip stocks and a rise in the Nasdaq.
The initial sell-off began on June 4, when the Nasdaq fell 4.18% after Broadcom issued weaker-than-expected guidance for AI chips. That triggered KOSPI’s first circuit breaker of June and amplified losses because of the index’s heavy weighting in memory manufacturers. Market participants said rapid position unwinds, rather than a broad macro shock, accounted for much of the initial decline.
Chaiwon Lee, chair of Life Asset Management, identified single-stock leveraged exchange-traded funds that track Samsung and SK Hynix as a structural factor that worsened the swing. He pointed to upcoming U.S. inflation data, a Federal Reserve meeting and the planned SpaceX listing on June 11 as near-term calendar items to watch.
On Wall Street, analysts framed the episode as a sector-level repositioning. Mandy Xu, head of derivatives market research at Cboe, wrote it was “mostly a positioning-driven unwind at the sector level” after a strong rally. Jim Reid, global head of macro research at Deutsche Bank, wrote that “the AI trade has continued to bounce back this morning.”
Nvidia’s chief executive, Jensen Huang, speaking in Seoul after meeting representatives of SK Group, described the AI infrastructure buildout as “just beginning” and called recent price dips “buying opportunities.”
KOSPI has nearly doubled since January. The concentration of AI-related investment, especially in memory chips, has increased day-to-day volatility in the index. The June 9 rebound recovered much of the prior losses, while market participants said volatility could continue as long as chip stocks dominate the benchmark. Traders are focused on U.S. CPI due June 10 and the Federal Reserve meeting that follows.
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