KOSPI plunges 12% on midterm blue wave and tech sector selloff says Goldman Sachs

South Korea’s KOSPI fell 12% this week and stood 44.5% below its June peak, with foreign outflows concentrated in technology stocks amid concerns about potential data center restrictions and a midterm blue wave, according to Goldman Sachs. The won weakened 1.6% against the U.S. dollar, 1.7% against the euro and 1.2% against the yen; the Korea Equity Risk Barometer remained in risk-averse territory at -1.2. KOSPI 12-month forward EPS was revised up 3.4%, while the government temporarily eased margin-loan collateral requirements for three months.

Analysis

The key disconnect is price versus earnings: forward EPS revisions remain positive, but foreign selling and risk aversion are overwhelming that support. If revisions hold, this looks more like a risk-premium/positioning shock than confirmed earnings deterioration; if technology restrictions begin cutting orders or capex, the earnings cushion could disappear. The weakness in the won compounds foreign investors’ losses in dollar terms and may sustain outflows, even as currency translation can support exporters’ reported results. That benefit is conditional: imported inputs and energy become more expensive, and it does not offset a demand shock.

Near term, the collateral-rule easing may reduce forced-sale risk, but it is a circuit breaker, not evidence that leverage or investor confidence has recovered. The lower leveraged-ETF exposure also means less forced deleveraging fuel, while leaving scope for volatility if outflows accelerate. Over 1–3 months, watch foreign flows, the won, and whether technology EPS revisions turn negative. Over 6–18 months, the material risk is policy-driven diversion or delay of data-center investment, which could pressure Korean technology supply-chain demand; the scale cannot be assessed without details on the proposed restrictions and affected orders.

Contrarian angle: the crisis-scale drawdown comparison may anchor investors to past bottoms, but it is not a valuation signal. Positive revisions argue against treating the whole market as a confirmed earnings recession; they do not establish that technology is cheap. No verified company-level exposure or valuation data supports a single-name call.

Key Decisions for Investors

• Avoid adding broad Korea beta solely because the index is near historic drawdown territory. Reassess after foreign selling slows and the won stabilizes; use EWY as a liquid proxy for monitoring or expressing broad-market exposure.
• For portfolios with existing Korea exposure, consider a limited, defined-risk EWY put spread as a 1–3 month hedge only if option pricing is acceptable. Reduce or remove the hedge if foreign flows turn persistently positive and technology earnings revisions remain positive.
• Do not short Korean technology on the policy headline alone. First verify the scope and implementation timeline of data-center restrictions, affected customer orders, and subsequent company guidance; a lack of measurable order impact would weaken the bearish thesis.
• Monitor margin-loan balances and brokerage collateral indicators alongside ETF flows. A renewed rise in margin stress or a turn to negative forward EPS revisions would strengthen the downside case; stabilization in both would argue against extrapolating the selloff.