This Nation's Stock Market Is Outperforming All Others This Year. Should You Invest?

South Korea's Kospi is up nearly 60% in 2026, while the iShares MSCI South Korea ETF (EWY) has risen almost 88%, led by Samsung Electronics and SK Hynix's semiconductor gains. Goldman Sachs targets Kospi at 9,000 over 12 months, implying 34% upside from 6,715, and forecasts aggregate Kospi earnings growth of 300% this year amid memory-chip shortages and AI infrastructure demand. Korean equities trade near 12x earnings versus roughly 26x for the S&P 500, though EWY is highly concentrated in Samsung (34.6%) and SK Hynix (26.3%), leaving investors exposed to semiconductor volatility.

Analysis

EWY is effectively a concentrated long-memory/long-KRW position rather than diversified Korean equity exposure. Its marginal buyer base is likely momentum-oriented foreign capital, so a reversal in either HBM pricing or the won can create amplified ETF outflows despite relatively modest changes in domestic Korean fundamentals. At this stage, the index-level valuation discount is less informative than the durability of memory pricing and each supplier's HBM yield/qualification trajectory.

The key competitive question is whether Samsung closes the HBM execution gap with SK Hynix or remains principally exposed to conventional DRAM/NAND. Successful qualification at a major AI accelerator customer would shift the market from viewing Samsung as a cyclical memory beta to an HBM share-gainer, while failure would direct incremental AI-memory economics toward SK Hynix and, indirectly, MU. For MU, Korean supply discipline is supportive to pricing, but it also limits the upside surprise if investor expectations already assume a prolonged shortage.

Near term, the crowded risk is a positive feedback loop from local index performance into ETF flows; this can persist for weeks but is vulnerable to a single adverse memory-price datapoint. Over 1-3 months, monitor contract DRAM/HBM price revisions, capex announcements, and Nvidia/customer qualification commentary. Over 6-18 months, the principal bear case is that elevated memory margins induce capacity additions just as hyperscaler AI capex growth normalizes; that combination would compress both earnings estimates and the premium paid for AI-adjacent cyclicals.

Key Decisions for Investors

• Do not chase EWY outright after the sharp move; use it only as a tactical vehicle on a 8-12% pullback, sized as a semiconductor factor exposure rather than an emerging-market allocation. Exit if quarterly DRAM contract pricing turns negative or KRW weakens more than 5% versus USD from entry.
• Maintain a 1-3 month relative-value long MU / short EWY position for investors seeking memory exposure with less Samsung-specific HBM execution risk. The thesis is falsified by confirmed Samsung HBM qualification plus upward Samsung earnings revisions that exceed MU revisions; target a 10-15% relative return with a 7% spread stop.
• Set an event-driven alert around Samsung and SK Hynix earnings: buy EWY only if both report sustained HBM margin expansion without a meaningful capex acceleration. A capex increase aimed at defending share is bearish for the 2027 memory-profit pool and argues for reducing MU and EWY exposure.
• For GS, treat any Korea-index target or research optimism as sentiment support rather than a direct earnings catalyst. No standalone position is warranted unless cross-border equity issuance, trading volumes, or Korean client activity visibly lift capital-markets revenue expectations.