South Korea’s KOSPI Crashes Nearly 10% Amid Contagion Risk to Crypto

The Korea Composite Stock Price Index (KOSPI) has suffered a jarring 10% crash, with analysts pointing accusing fingers at the underperformance of US stocks. Meanwhile, cryptocurrency investors are keeping a close eye on the South Korean sell-off for the earliest sign of a spillover effect.

KOSPI tumbles toward double-digit loss 

South Korea’s benchmark stock index ended its fine run with a pullback that has left investors scratching their heads. According to market data, KOSPI fell by 910.71 points on Tuesday to close the day at 8,203, a steep decline of 9.99% over the last day. The jarring decline is KOSPI’s largest since early March and the tenth-biggest daily drop in history. As the index fell, trading volumes surged, with $38.9 billion worth of shares exchanging hands during the day.

KOSPI fell by 10% on Tuesday. Source: TradingView

Samsung Electronics and SK Hynix, the two most dominant entities on South Korea’s KOSPI index, lost over 12% of their valuations. The steep decline triggered an automatic market-wide suspension of trading, a move intended to prevent flash crashes and rebalance order pools.

Analysts say the sell-off comes amid weakness in US tech stocks, with the Nasdaq Composite sliding 1.3%. The weakness stems from valuation concerns in US-based technology companies after IPOs, dragging Nasdaq futures underwater.

Meanwhile, retail investors are the hardest hit in KOSPI’s decline due to heavy margin usage. At the start of the week, South Korean regulators warned that authorities may have approved leveraged funds before establishing proper guardrails for retail investors.

“What worries me is that retailers are in the driving seat, because they use a lot of margin, though the ratio to market cap is small,” said Alexander Redman, chief equity strategist at CLSA. “What is more worrying is that regulators have now allowed leveraged single-security ETFs, pouring fuel onto the fire.”

Risk-off sentiment spreads to crypto after KOSPI Crash

The KOSPI decline also drew attention across crypto markets with investors scanning the horizon for contagion risks. South Korea is a major retail trading hub with 15 million traders, representing over 25% of the national population.

Analysts noted that the same appetite for leveraged speculation that fueled growth in crypto derivatives and memecoins has spilled into equity-linked ETF products in recent years. South Korean retail investors are among the world’s most active participants in high-risk trading strategies, with speculative activity extending across digital assets and traditional financial markets.

The broad sell-off weighed on risk sentiment, with Bitcoin and Ethereum recording daily declines. The premier cryptocurrency lost 4% while the largest altcoin shed 5.38% of its market capitalization over the last day. 

Other altcoins did not fare any better, with Solana tumbling by nearly 7% and Hyperliquid sliding by 9% in the same window. Akin to KOSPI, cryptocurrency trading volumes spiked, sparking concerns of an imminent spillover effect for investors.