Goldman says this stock market is likely to outperform the US equity market index

Goldman Sachs says KOSPI is positioned to keep outperforming U.S. equity indices, supported by reshoring of investment accounts, stronger retail inflows into domestic ETFs, and robust foreign demand for Korean tech. The KOSPI is up 50% YTD after a 4.6% weekly gain and has reached an all-time high, while the SPX is up just 4.47% YTD. Strength in AI-driven semiconductors, memory chips, and defense is reinforcing Korea’s relative-growth case despite some sector outflows from tech and autos.

Analysis

The most important second-order effect is not simply “Korea up, U.S. down,” but the acceleration of domestic capital recycling in Korea at the margin. Once retail sees persistent local outperformance plus a policy channel that reduces the tax friction of staying home, the feedback loop can become self-reinforcing for months: domestic ETFs, brokerages, and cyclicals get a structural bid while U.S.-heavy retail sleeves lose incremental support. That matters because the marginal buyer has been retail, not institutions, and retail flows tend to amplify trend persistence rather than mean-revert quickly.

The sector composition suggests the market is pricing an earnings mix shift rather than a broad multiple rerating. Memory, shipbuilding, machinery, and defense are all leveraged to a capex cycle and geopolitically-driven demand, so any sustained AI-driven semiconductor recovery can ripple into equipment, logistics, and industrial subcontractors before it shows up in headline index levels. The laggards — financials, pharma, insurers — imply the rally is still not a pure “quality bid,” which leaves room for breadth to expand if earnings revisions continue; that usually extends the move by several weeks to a few quarters.

The key risk is positioning exhaustion, not macro. A sharp reversal in foreign selling, a cooling in semiconductor pricing, or a reduction in geopolitical premium could hit the high-beta cohort quickly, especially if U.S. risk assets stabilize and narrow the performance gap. Over a 1-3 month horizon, this is likely a momentum trade; over 6-12 months, the real question is whether Korea can sustain earnings upgrades fast enough to justify continued multiple expansion versus the U.S., where buybacks and megacap dominance still provide a lower-volatility alternative.

Consensus may be underestimating how much of this is a relative-value trade disguised as a thematic story. If retail keeps rotating from U.S. ETFs back into domestic equity products, the under-owned beneficiary is not just the KOSPI index, but local brokers, ETF sponsors, and domestic market infrastructure names that monetize turnover. Conversely, if the Korea rally becomes crowded, the more fragile piece is the tech beta — semis can outperform on fundamentals while still underperforming on crowded positioning if global growth data softens.

Key Decisions for Investors

• Go long EWY / short SPY for a 1-3 month relative-value trade; use a 3-5% trailing stop on the long leg because the thesis is flow-driven and can reverse quickly if U.S. risk sentiment improves.
• Overweight Korean brokerage and ETF-distribution beneficiaries versus broad KOSPI exposure for the next 1-2 quarters; the marginal monetization of retail repatriation should show up first in turnover-sensitive financials rather than the index itself.
• Add a tactical long in Korean semis via an ETF or leader basket, but size smaller than the index trade; the upside is higher if AI capex stays firm, but the convexity cuts both ways if memory pricing or global tech multiples compress.
• Consider a pair long KOSPI / short U.S. large-cap growth into any near-term risk-off window; the spread should work best if foreign flows remain negative in Korea and retail stays domestically anchored.
• If KOSPI breadth narrows again while the index makes new highs, fade the move by reducing beta exposure; that would signal late-cycle chasing and a higher probability of a 5-8% drawdown over the following 2-6 weeks.