CluenexWhat is a single-country ETF?
A single-country ETF is an exchange-traded fund (a fund that trades on an exchange like a stock) that holds the listed companies of one nation. It usually tracks an index that weights each company by its market capitalization, meaning its total share value.
The structure does what it advertises: one ticker gives exposure to one national stock market, with no foreign brokerage account needed. What the label hides is composition. A country fund does not hold a cross-section of an economy. It holds the economy's large, listed companies in proportion to their value, and in many countries that means a handful of exporters dominate.
What does EWY actually hold?
The iShares MSCI South Korea ETF (EWY) had 81 holdings and about $15.7 billion in net assets as of 31 March 2026, according to the iShares fact sheet. Two semiconductor companies made up 41.13% of the fund.
| Holding | Weight |
|---|---|
| Samsung Electronics | 22.35% |
| SK Hynix | 18.78% |
| Hyundai Motor | 2.66% |
| KB Financial Group | 2.32% |
| SK Square | 2.03% |
| Hanwha Aerospace | 1.91% |
| Doosan Enerbility | 1.86% |
| Shinhan Financial Group | 1.71% |
| Kia Corporation | 1.54% |
| KRW cash | 1.52% |
| Top 10 total | 56.68% |
The next eight holdings together are 15.55%. By sector, Information Technology was 44.91%, Industrials 21.52% and Financials 11.29%. In practice, an EWY buyer owns memory chips first, then industrial manufacturers, then Korean banks.
These figures are a snapshot. Weights shift at every rebalance, so check the current fact sheet before relying on them.
Why does the largest holding stop near 22%?
Samsung's weight sits just under a rule-based ceiling, not a manager's view of risk. EWY tracks the MSCI Korea 25/50 Index, built so US-registered funds can meet the diversification tests for a Regulated Investment Company (RIC) in the Internal Revenue Code.
Those tests, in Section 851, limit a single issuer to 25% of assets, and issuers above 5% must not add up to more than 50%. To stay compliant between rebalances, MSCI applies a 10% buffer: a single issuer is capped at 22.5% and issuers above 4.5% at 45% in total, at rebalance.
The lesson applies to country funds generally. The diversification you see is often the legal minimum, not a prudent level. Without the cap, the fund would likely be even more concentrated.
How does a country fund compare with a global fund?
A country fund removes the cushion a global fund provides. Both funds below are iShares products measured on the same date.
| Measure, as of 31 March 2026 | EWY (South Korea) | ACWI (global) |
|---|---|---|
| Number of holdings | 81 | 2,270 |
| Largest single position | 22.35% | 4.70% |
| Top 10 holdings | 56.68% | 22.95% |
| Largest sector | Info Tech 44.91% | Info Tech 26.29% |
| Standard deviation (3 years) | 34.38% | 11.49% |
| Beta vs S&P 500 (3 years) | 1.41 | 0.92 |
| Expense ratio | 0.59% | 0.32% |
| South Korea exposure | 100% | 1.76% |
Standard deviation measures how widely returns swing around their average, and EWY's was about three times the global fund's. Beta measures how much a fund moves relative to the S&P 500. The last row describes the decision: the global fund already holds South Korea at 1.76%, so buying EWY instead of adding it multiplies that weight by roughly 57.
For more on spreading risk, see how to diversify a stock portfolio.
What currency risk comes with a foreign country ETF?
Unless a fund says it is currency-hedged, a US investor carries currency risk. EWY holds shares priced in Korean won and reports in dollars, so the dollar return combines what Korean shares did and what the won did against the dollar.
The two can move together. When foreign investors leave a market, they sell both shares and the local currency, which can make the dollar loss larger than the local loss. The effect can also help on the way up.
Currency exposure is not a flaw. It is an extra position taken by default, and many buyers never decide on it consciously.
Does concentration help or hurt returns?
It widens the range of outcomes in both directions. Calendar-year NAV (net asset value) returns from the iShares fact sheets show how far apart the two funds can land.
| Calendar year | EWY | ACWI (global) | Difference |
|---|---|---|---|
| 2021 | down 7.56% | up 18.38% | 25.9 points behind |
| 2022 | down 26.70% | down 18.27% | 8.4 points behind |
| 2023 | up 19.05% | up 22.22% | 3.2 points behind |
| 2024 | down 20.79% | up 17.41% | 38.2 points behind |
| 2025 | up 97.57% | up 22.43% | 75.1 points ahead |
| 10-year annualized | 10.64% | 11.54% | 0.9 points behind |
In 2024 the fund trailed the world by 38 points, and in 2025 it led by 75. Over ten years to 31 March 2026, even with a near doubling in one year, EWY's annualized return trailed the global fund's while carrying about three times the volatility. Past returns do not predict which country will lead the next decade.
Where does the single-country idea fail?
A country fund can mislead in several ways. These are the common ones.
- Holding count is not diversification. EWY's 81 positions include two that total 41.13%. The remaining holdings share one currency, one regulator and largely one export cycle.
- The fund is not the economy. It holds listed companies by market value. Hospitals, small shops and private firms barely show up, so the 44.91% technology weight reflects the stock exchange, not the whole country.
- The index cap is not a safety net. It exists for tax qualification and still allows a 22.5% single position at rebalance.
- Currency does not reliably cancel out. No mechanism guarantees it over the period you hold the fund.
- Higher volatility is not higher expected return. Risk that could be diversified away is not reliably rewarded, and over this ten-year window EWY did not earn more.
The cheaper valuation can be read either way. On the same date EWY traded at 16.99 times earnings versus 21.99 for the global fund. Analysts disagree on whether that gap is a discount for risk or an opportunity.
How can you check a country fund before buying?
Five checks take about ten minutes and use only the fund's fact sheet.
- Read the top ten holdings first. If two names exceed 40% of assets, think of the fund as those two companies.
- Compare the largest sector with a global benchmark. EWY's 44.91% versus 26.29% shows the tilt. Above roughly 40% in one sector, the fund behaves like a sector fund.
- Find what you already own. A global fund's country breakdown shows your existing weight. Adding a country fund is a deliberate overweight.
- Confirm whether currency is hedged. The fund's documents state it. Unhedged is the usual default.
- Size the position to its volatility. At 34.38% volatility versus 11.49%, a 10% EWY holding adds roughly the stock-market swings of a 30% global holding (34.38 / 11.49 is about 3.0, a simplification that ignores correlation). See position sizing.
Worked example: sizing a Korea position
An investor holds $200,000 in a global fund with 1.76% in South Korea, or $3,520. They move money from the global fund into EWY. Korea exposure counts both holdings, and Samsung plus SK Hynix is 41.13% of the EWY slice.
| EWY allocation | Total Korea exposure | Multiple of global weight | Samsung + SK Hynix via EWY |
|---|---|---|---|
| $0 | 1.76% | 1.0x | $0 |
| $10,000 (5%) | 6.7% | 3.8x | about $4,100 (2.1%) |
| $20,000 (10%) | 11.6% | 6.6x | about $8,200 (4.1%) |
| $50,000 (25%) | 26.3% | 15.0x | about $20,600 (10.3%) |
For the $10,000 row: $190,000 times 1.76% is $3,344, plus $10,000 is $13,344, or 6.7% of $200,000. At a 10% allocation, two Korean chipmakers alone are about 4.1% of the portfolio, larger than the 4.70% top holding of the global fund would suggest comfortable, and reached without choosing either company. This is the same risk described in concentrated stock positions.
What this means for you
Treat a country fund as a deliberate bet, not a basic building block. A low-cost global fund already includes every major country at its market weight.
- Open the fact sheet and write down the top two holdings and the largest sector before buying.
- Look up your existing weight in that country through your global funds, then decide the overweight in dollars.
- Cap the position at a size you could watch fall by half without selling in a panic.
- Know the cycle behind the fund. EWY's top holdings are memory chipmakers, so the memory chip cycle matters more than Korean politics for most of its moves.
Cluenex covers about 1,000 large US-listed stocks and does not cover Korean-listed shares, so it cannot value Samsung or SK Hynix. It can help with the US-listed customers, suppliers and competitors in the same cycle, each with a free public page at cluenex.com/stocks/ followed by the lowercase ticker.