TLDR
- KOSPI fell sharply on June 8 before rebounding 8.18% the next day.
- The June 9 gain marked the index’s strongest single-day rise of 2026.
- Samsung Electronics dropped 10.2% and then recovered 9% in the rebound.
- SK Hynix slid 7.7% before surging 16.01% in the following session.
- A Nasdaq decline of 4.18% on June 4 triggered the initial sell-off.
South Korea’s benchmark index swung sharply within two sessions as chip stocks drove heavy losses and a rapid rebound. The market fell on June 8 and then climbed 8.18% on June 9, marking its strongest daily gain of 2026. Traders reacted to global semiconductor cues while large memory stocks steered the index direction.
KOSPI Rebounds After Circuit Breaker Shock
The KOSPI dropped sharply on June 8 after a global chip sell-off triggered risk reduction across Asian markets. The decline followed a 4.18% fall in the Nasdaq on June 4 after Broadcom cut AI chip guidance. Korean equities then activated a circuit breaker for the first time in June as selling accelerated.
Nvidia CEO Jensen Huang said today in Seoul (after meeting SK Group) that AI infrastructure buildout is “just beginning” and the recent tech stock selloff is a buying opportunity.
— The Big Homie Coffee Specialist (@BHomiecoffee) June 8, 2026
However, the index rebounded 8.18% the next day as chip stocks rallied in global trading. Samsung Electronics rose 9% after falling 10.2% in the prior session. SK Hynix jumped 16.01% after a 7.7% slide, and both companies together account for about 40% of the index weight.
Chaiwon Lee, chair of Life Asset Management, linked the overshoot to leveraged exchange-traded funds tied to single stocks. He said, “The market is likely to take a breather for the time being.” He pointed to upcoming US inflation data, a Federal Reserve meeting, and the SpaceX listing on June 11.
Chip Stocks Drive Rapid Recovery
The rebound aligned with gains in US semiconductor shares during overnight trading. Intel and Micron advanced, while the Nasdaq also closed higher. The moves restored confidence in the semiconductor sector after the earlier sell-off.
Mandy Xu, head of derivatives market research at Cboe, described the drop as positioning-related. She wrote that the sell-off was “mostly a positioning-driven unwind at the sector level.” She added that it reflected profit-taking after a strong rally rather than a broader macro retreat.
Jim Reid, global head of macro research at Deutsche Bank, also addressed the recovery. He said, “The AI trade has continued to bounce back this morning.” Nvidia CEO Jensen Huang also called recent dips “buying opportunities” during public remarks.
The KOSPI has nearly doubled since January, placing it among the top-performing markets in 2026. Heavy exposure to memory manufacturers amplifies moves linked to US chip sentiment. The index now faces another test on June 10 when US CPI data is released.
