SeoulMarkets · data for licence
Korea Concentration Index
Stocks as of 2026-09-08 · trade 2026-06 · updated every trading day
Rank Korea's listed stocks by value or by trading, or rank its trading partners by exports or imports. Each time, the four largest are about half of the total — and every concentration Gini clears 0.9, past any nation's income gap. It is one of the most top-heavy major economies on earth, whether you weigh it by its market or by its trade. This is the compass, free. The full daily history and API are what we licence.
| Measured by | Across | Top 4 share | Half at | Gini |
|---|---|---|---|---|
| Stock market cap | 2873 listed stocks | 51.5% | 4 | 0.945 |
| Stock trading | 2727 traded stocks | 46.6% | 6 | 0.951 |
| Exports | 222 partner countries | 56.5% | 4 | 0.924 |
| Imports | 195 partner countries | 50.1% | 4 | 0.907 |
13 trading days so far — the series grows every trading day. The download here is free.
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The full write-up: Korea's stock market and trade: the top four are half of everything.
Korea market & trade concentration — the questions people ask
How much of the KOSPI is Samsung?
Samsung Electronics is about 26.7% of the entire Korean stock market (KOSPI + KOSDAQ) by market cap; with SK hynix, the two chipmakers are close to half. See four stocks are half of Korea's market.
How concentrated is the Korean stock market?
The four largest stocks are 51.5% of total market cap and the top ten are about 60%; the concentration Gini is 0.945. KOSDAQ holds only ~7% of value but a much larger share of daily trading — see KOSDAQ trades above its weight.
Who are South Korea's biggest trading partners?
Korea's top export markets are the United States and China, nearly tied near 20% each; its single biggest import source is China, about a quarter of all imports. The top four partners are roughly half of trade either way — see two giants, one supplier.
What is the KOSPI vs KOSDAQ market cap split?
KOSPI holds about 93% of total listed market value; KOSDAQ, with nearly twice as many companies, holds about 7%.
How many companies are listed on the Korean stock market?
About 2,764 issues are listed across KOSPI (≈940 of them) and KOSDAQ (≈1,820), counting common and preferred lines; the top ten are roughly 60% of all market value.
Which country does Korea export to the most?
Korea's two largest export markets are the United States and China, nearly tied at about 20% each; together they take close to 40% of exports. Its largest single import source is China, about a quarter of all imports.
Built from Korea Exchange OPEN API (KOSPI + KOSDAQ daily) and Korea Customs Service partner-country trade via KOSIS. Every figure is a share or a Gini — scale-invariant, so it does not depend on the price or dollar levels in the raw feeds; absolute prices are not published. The Gini here measures concentration across issues or partner countries — the income-Gini comparison is an intuition anchor, not an identical calculation. Not investment advice. See our terms.