Kospi Plunges 6% on July 30 as SK Hynix Earnings Disappoint

South Korea’s benchmark Kospi index plunged 6.1% to 5,656 on July 29 after chip giant SK Hynix reported record quarterly results that disappointed investors expecting even stronger performance. The sell-off wiped as much as HK$17 trillion from Seoul’s equity market, marking the second consecutive day of steep losses. Finance Minister Koo Yun-cheol announced emergency stabilization measures, including new restrictions on single-stock leveraged exchange-traded funds that have fueled retail speculation.

Why SK Hynix’s record quarter triggered a crash

SK Hynix reported 79.32 trillion won in second-quarter revenue and 60.54 trillion won in operating profit, both record highs. Yet both figures missed analyst forecasts of 84 trillion won and 64 trillion won respectively. Operating profit jumped 557% year-over-year, driven by soaring demand for AI server memory chips. The miss shattered investor confidence that the artificial intelligence boom would deliver endless growth, causing the stock to fall 9.6% despite the extraordinary financial performance.

Leveraged retail traders amplified the selloff

Much of the buying during the Kospi’s earlier rally came from small retail investors using borrowed money through leveraged ETFs. As prices fell, brokers forcibly shut down losing positions, accelerating the decline. The Kospi shed more than 40% from its June peak. Finance Minister Koo apologized for introducing single-stock leveraged ETFs without adequate consideration, saying they had not been carefully evaluated. Trading volumes fell sharply, signalling buyers had abandoned the market.

Government moves to stabilize markets and restrict leverage

South Korea’s Finance Ministry announced immediate measures after an emergency meeting on July 29, including capping individual investment in leveraged ETFs at up to 20% of total portfolio value and raising trading costs. Authorities will seek legal powers to impose emergency market stabilization measures, drawing on Hong Kong’s flexible leverage regime. The government pledged round-the-clock market monitoring at the highest alert level, signalling deep concern about further contagion.

Broader AI boom questions weigh on Asian tech

The Kospi’s collapse reflects growing doubts about whether massive capital expenditure on AI infrastructure will generate sufficient returns. SK Hynix emphasized sustained AI demand and record cash generation, yet markets punished the stock for missing forecasts. Taiwan’s index fell 3.8%, while Tokyo dropped 3% as chip suppliers like Kioxia tumbled 13.9%. Analysts note China’s advances in semiconductor alternatives and AI model development are eroding confidence in foreign chip leaders’ pricing power and long-term margins.

Final Thoughts

The Kospi’s 6.1% crash reveals how quickly AI enthusiasm can reverse when earnings miss inflated expectations, even at record levels. South Korea’s emergency curbs on leveraged ETFs signal policymakers fear retail losses could trigger deeper instability. For investors, the data suggests caution: record profits no longer guarantee gains when the bar has been raised to perfection.

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