The KOSPI hit a new all-time high of 6,615.03 on April 27, 2026 — up 73.7% since the start of the year. But this rally has not been evenly distributed.
The Return Gap Is Wider Than It Looks
The large-cap index gained +60.96% year-to-date, while the small-cap index managed only +19.76% — a 3x return differential. In January alone, the gap hit 32x (large-caps +15.2% vs small-caps +0.47%).
Why: Two Stocks Dominate the Market
Samsung Electronics and SK Hynix together hold 35.8% of total KOSPI market cap (2,185T KRW out of 6,104T KRW). When foreign investors buy Korea, they are essentially buying these two. On April 27, foreigners net-bought 890.6B KRW and institutions added 1,100.8B KRW — almost entirely concentrated in large-caps.
Historical Pattern: Small-Caps Tend to Outperform in May-June
Based on 10 years of data, small-caps have historically outperformed large-caps by an average of 2.7 percentage points in May and June. The triggers: post-earnings season reassessment and sector rotation from stretched large-caps.
Current Outlook: Large-Cap Bias Likely to Continue
With US tariff uncertainty unresolved and the semiconductor giants maintaining strong earnings visibility, the large-cap preference is unlikely to break soon. The reversal condition would require an earnings shock at Samsung or SK Hynix, or a Fed rate hike resumption.
For the full analysis in Korean, visit Snakestock
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