KOSPI sinks over 8% in tech-led rout

South Korea’s benchmark KOSPI index plunged on Monday, June 8, 2026, in a broad-based selloff led by technology and semiconductor shares. The index fell as much as 8.8% in early trading and eventually closed down 676.18 points, or 8.29%, at 7,484.41 after touching an intraday low of 7,442.73.

The steep losses marked one of the sharpest single-day declines for the market in recent years, as selling pressure intensified shortly after the opening bell and spread across major constituents. The rout highlighted the vulnerability of the index to shifts in sentiment around large-cap technology names.

Chipmakers were at the center of the downturn, with Samsung Electronics and SK Hynix each dropping more than 10% in early trade. Their declines weighed heavily on the tech-heavy benchmark and contributed significantly to the overall index fall.

The sharp pullback in these bellwether semiconductor stocks followed an extended rally in chip-related names. Their early-session losses set the tone for broader weakness across other technology and growth-focused shares in the Korean market.

The Korea Exchange moved quickly to stabilize conditions as volatility spiked. About three minutes after the market opened, a circuit breaker was activated, temporarily halting trading for 20 minutes after the index fell sharply.

As selling pressure persisted, the exchange also implemented sell-side 'sidecar' trading curbs on the KOSPI and later on the KOSDAQ. These mechanisms were designed to slow program selling and limit disorderly price moves during the session.

Foreign investors were net sellers of local shares worth about 1.2 trillion won during the session, adding to the downward pressure on prices. This outflow extended their net-selling streak to 21 consecutive trading days.

Sustained foreign selling coincided with heightened volatility in domestic equities and contributed to pressure on the Korean won. Authorities held emergency meetings as they monitored market conditions and currency moves.

The Korean selloff followed stronger-than-expected U.S. payrolls data, which lifted expectations of a potential Federal Reserve interest rate hike. The data release prompted a reassessment of global monetary conditions among investors.

U.S. technology and semiconductor gauges also fell sharply, with the Nasdaq declining about 4.2% and the Philadelphia Semiconductor Index down roughly 10%. These moves fed into sentiment in Asia, where markets with a heavy concentration of tech stocks, including South Korea, showed particular sensitivity to changing U.S. rate expectations.

The combination of rising Fed hike bets, heavy losses in U.S. tech benchmarks, and profit-taking after an extended rally in chip names contributed to the scale and speed of the KOSPI’s decline on June 8.