KOSPI Slides Into Bear Market on Chip Selloff

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South Korea's benchmark KOSPI has fallen 20% from its June record high of 9,385, entering bear market territory on a global AI chip selloff led by Samsung and SK Hynix.

Lead

South Korea's KOSPI officially entered a technical bear market this week, sliding more than 20% from its all-time high of 9,385.59 reached on June 19 as a cascading semiconductor stock selloff erased hundreds of billions of won in market value in under three weeks. The Korea Exchange activated its sixth circuit breaker of 2026 on July 7 — a full halt on equity trading triggered when the index fell more than 8% from its previous close — setting a record that eclipses the volatility endured during the 2008 global financial crisis. A benchmark that ranked as the world's best-performing major index as recently as June has now entered correction territory so severe it has broken institutional memory.

What Happened

The proximate catalyst arrived on July 1, when Meta Platforms disclosed plans to monetize idle AI computing capacity by selling access to external customers. The announcement demolished a foundational market assumption: that AI-related chip demand would remain structurally undersupplied. The Philadelphia Semiconductor Index fell more than 10% across two sessions in response. Micron Technology declined more than 10% on July 1 alone. AMD and Intel shed between 6.9% and 10.6%. Cloud infrastructure names bore additional damage — CoreWeave fell 14%, Nebius 17% — as investors concluded that Meta's idle compute implied potential oversupply across the entire AI hardware stack.

The shock moved to Seoul overnight. On July 2, the KOSPI closed at 7,648.09, down 7.89% from the prior session — one of the steepest single-day declines in the benchmark's history. Samsung Electronics fell 9.75%; SK Hynix dropped 10.58%. Foreign and institutional investors combined to sell more than 3 trillion won (approximately $2.0 billion) in equities during the session. The Korea Exchange triggered a sell-side sidecar at 9:07 a.m., suspending algorithmic program trading for five minutes before markets reopened, only to see losses deepen through the close.

Market Reaction

The severity of the correction carried a fundamental paradox. Samsung Electronics separately reported a record second-quarter operating profit of 89.4 trillion won — approximately $58.6 billion — easily clearing market expectations on the strength of AI memory chip demand. The results failed to stem the decline. Investors appeared to conclude that exceptional earnings were already embedded in share prices following a rally that had taken the index more than 100% above its cycle lows. The pattern — blockbuster earnings, elevated valuations, violent profit-taking — has become the defining dynamic of the KOSPI's 2026 trading year.

Despite the bear-market drawdown, the index retains a year-to-date gain of approximately 72%, a figure that illustrates both the scale of the preceding rally and the acute concentration of gains that is now being unwound.

Structural Drivers

Two structural forces have amplified the KOSPI's volatility beyond what sector fundamentals alone can explain. First, the proliferation of leveraged and inverse exchange-traded funds tied to individual South Korean technology names — particularly Samsung Electronics and SK Hynix — has mechanically accelerated directional moves. By July, these products accounted for 24% of daily trading value, up from 16.1% in June, forcing compulsory rebalancing that deepens intraday swings regardless of underlying news flow.

Second, a broader capital rotation is underway. Institutional investors are reallocating from South Korean semiconductor names, where valuations stretched to historic extremes during the AI rally, toward Chinese technology stocks, which trade at materially lower multiples and are seen as direct beneficiaries of Beijing's domestic AI infrastructure push. Reports in late June that Apple was evaluating Chinese memory suppliers as an alternative to South Korean manufacturers introduced further supply-chain uncertainty into an already nervous market.

Losses extended beyond semiconductors. LG Energy Solution, the country's largest EV battery manufacturer, reported second-quarter operating profit well below consensus forecasts, citing deteriorating electric vehicle demand in North America and Europe. The result placed simultaneous pressure on both of the KOSPI's primary growth narratives: AI-driven chip demand and the energy transition supply chain.

The South Korean won provided a partial offset. The currency broke through 1,500 per dollar in early July, firming to 1,498.5 — its strongest reading since May 29. Won appreciation reduces the domestic currency value of dollar-denominated export revenues, however, adding a valuation headwind on top of the share price declines for companies whose earnings are predominantly reported offshore.

Outlook

The KOSPI's trajectory in the second half of 2026 will hinge on two variables: the direction of hyperscaler AI capital expenditure and the resolution of South Korea's semiconductor supply-chain positioning. Samsung's record profitability and SK Hynix's dominant share of high-bandwidth memory production provide a fundamental floor, but those arguments have been unable to hold against a market questioning whether AI infrastructure spending is entering a moderation phase. Six circuit breakers in seven months, thirty sidecar activations, and a 20%-plus drawdown from peak collectively signal a market recalibrating fast. Until investors gain clearer visibility into the trajectory of global AI capex commitments, South Korean equities will likely absorb further pressure before equilibrium is established.

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