EWY and the Hidden Risks of Investing in South Korea
Time-zone gaps, semiconductor concentration, currency exposure—and whether there is a better Korea ETF
Checking your brokerage account at 9:00 p.m. in Denver can provide a false sense of security.
Your iShares MSCI South Korea ETF, or EWY, may appear unchanged from its last U.S. trade. Meanwhile, it is already the middle of the next trading day in Seoul, where Korean stocks could be falling sharply.
When I went on EWY at CNBC at 9 pm I saw an ETF with a quote up in the aftermarket next to news the Kospi had fallen by 8 percent.
The ETF’s displayed price may be standing still. The economic value of what you own is not.
This is only one of the risks embedded in EWY. The fund combines a mismatch between Korean and American trading hours with extraordinary exposure to two semiconductor companies and an unhedged position in the South Korean won.
It may look like a diversified international investment. In practice, it is a concentrated bet on one country, one currency and one particularly volatile industry.
1. The Time-Zone Trap
At 9:00 p.m. Denver time, it is noon the following day in Seoul during daylight-saving time and 1:00 p.m. during the winter. The Korea Exchange’s regular market session runs from 9:00 a.m. to 3:30 p.m., so Korean stocks are actively trading while most Americans are asleep.
EWY, however, is listed on NYSE Arca. By the time Seoul opens, the exchange sessions through which most American investors trade EWY have ended. The price displayed by a brokerage may consequently remain at the last available U.S. trade even as the Korean companies owned by the fund are being repriced.
That displayed price is not necessarily wrong. It is simply stale.
Suppose the Korean market has fallen 8 percent since EWY’s last meaningful U.S. trade. The precise change in EWY will also depend on the won and other market factors, but the investor’s economic position has already deteriorated even though the brokerage account may not yet display the loss.
Some brokers now provide overnight trading in selected U.S. securities, but access and liquidity vary. A trade on a thin overnight venue may also occur at a wide spread and provide a poor indication of where the ETF will trade once its primary market becomes active.
The fundamental problem remains: when the underlying Korean market is generating the most important new information, the deepest U.S. market for EWY is closed.
2. How Overnight Repricing Creates a Morning Gap
The stale closing price does not give an investor an opportunity to sell at yesterday’s level.
ETF investors need to distinguish among several different numbers:
The fund’s last traded price.
The current bid and ask prices.
The fund’s net asset value.
An estimate of what the underlying Korean securities are worth at that moment.
When Seoul is open but New York is closed, Korean shares continue to trade while EWY’s last U.S. price may remain unchanged. When Seoul is closed and EWY is trading in New York, the reverse problem arises: the last Korean share prices are stale, while investors use currency movements, futures, semiconductor stocks and new information to estimate what those shares will be worth when Korea reopens.
An ETF’s market price can therefore differ from its reported net asset value and trade at either a premium or a discount. Differences in foreign and U.S. market hours can make those discrepancies larger during periods of significant market activity.
NYSE Arca’s early trading session begins at 4:00 a.m. Eastern, or 2:00 a.m. in Denver, and its regular session begins at 9:30 a.m. Eastern, or 7:30 a.m. in Denver. When U.S. trading resumes, market makers incorporate what has happened to Korean shares, the won, semiconductor stocks and related markets.
If the overnight news is sufficiently bad, EWY may begin trading far below its previous close. There does not have to be an orderly decline through all the intervening price levels. The ETF can simply gap down.
That is also why a conventional stop-loss order cannot guarantee protection. Once the stop price is reached, a stop order becomes a market order. If EWY’s first available price is substantially below the investor’s stop, the order may execute near that lower market price rather than at the selected stop price.
The order has not malfunctioned. It has encountered a market that moved before the order had an opportunity to execute.
A stop-limit order prevents a sale below the investor’s limit price, but it creates the opposite risk: if EWY gaps through the limit, the order may not execute at all.
Even when an investor can sell, uncertainty may widen the bid-ask spread. The problem is therefore not always a complete absence of liquidity. Sometimes it is liquidity at a very unattractive price.
3. A Country Fund Can Also Be a Sector Bet
EWY sounds like a broadly diversified investment in South Korea. Technically, it owns shares in dozens of Korean companies.
Economically, however, the fund is extraordinarily concentrated.
As of July 27, 2026, EWY held 78 positions. SK Hynix represented 23.1 percent of the fund and Samsung Electronics another 21.9 percent. Together, two companies accounted for approximately 45 percent of its value. Information technology represented roughly half of the portfolio.
Those percentages will change with market prices and portfolio rebalancing, but the underlying problem remains. EWY’s performance is dominated by a small number of enormous technology companies.
An investor who believes he has purchased a general investment in the Korean economy has purchased something considerably narrower: a concentrated bet on South Korea’s semiconductor industry and two dominant corporations.
That concentration can produce spectacular gains when enthusiasm for artificial intelligence, memory chips and advanced semiconductors is rising. It can also magnify losses when expectations change.
A global semiconductor sell-off could hit EWY much harder than it hits a genuinely diversified international portfolio. The country label can obscure the fact that the investor has made a large industry bet.
4. Currency Exposure—and Why Hedging Usually Does Not Solve the Problem
EWY trades in dollars, but its underlying Korean shares are valued primarily in won.
That creates another source of risk.
Suppose Korean stocks fall 7 percent in local-currency terms. If the won also weakens by 4 percent against the dollar, the stock-market decline and the currency decline compound one another.
An investment initially worth the equivalent of $100 would fall to approximately:
$100 × 0.93 × 0.96 = $89.28
The combined loss would be about 10.7 percent—not merely the 7 percent decline reported by the Korean market.
The reverse can also occur. A strengthening won can offset part of a Korean stock-market decline or add to a local-market gain. But during episodes of capital flight or heightened global risk aversion, weakness in the local currency may intensify the losses experienced by American investors. Foreign exchange-rate movements can materially increase or reduce the dollar return on an international investment.
EWY is therefore not merely a bet on Korean companies. It is also an unhedged position in the Korean won.
In theory, a sophisticated investor could hedge some of these risks. A trader worried about the won could use foreign-exchange forwards or another position that benefits from a strengthening dollar. A trader concerned about the Korean market could use KOSPI 200 futures. Semiconductor stocks or futures might be used to offset part of the fund’s technology exposure.
None of these is a perfect hedge.
A currency position addresses movements in the won but does not protect against falling Korean stocks. KOSPI 200 futures do not precisely match the MSCI Korea 25/50 Index tracked by EWY. A semiconductor hedge introduces company-specific and basis risk.
These strategies may also involve leverage, margin requirements, trading costs and the danger that the hedge itself creates additional losses.
For most retail investors, constructing a constantly adjusted overnight hedge is unlikely to be worth the complexity. Obsessing over the market’s overnight plumbing can distract from the more important question: should an investor who cannot tolerate a sudden decline own such a concentrated position in the first place?
5. Is a Korea ETF Appropriate—and Which One?
None of this means that EWY is necessarily a bad investment.
An investor who deliberately wants exposure to South Korean semiconductors, the Korean market and the won may find it useful. EWY provides easy access to securities that would otherwise be difficult for many Americans to purchase directly.
The mistake is treating EWY as though it were a conventional, broadly diversified international allocation.
A genuinely diversified international fund spreads its investments across many countries, currencies, industries and companies. A Korea ETF does not. The investor should first decide whether a deliberate single-country position belongs in the portfolio and only then choose the vehicle.
EWY: Best for Trading and Liquidity
EWY is the dominant U.S.-listed Korea ETF.
As of July 27, 2026, it had approximately $23 billion in assets and a 30-day average volume of more than 23 million shares. Its reported median bid-ask spread was only 0.03 percent as of July 24. It charges an annual expense ratio of 0.59 percent.
That combination makes EWY the strongest vehicle for institutions and active investors who place a high value on liquidity, narrow spreads and the ability to move large positions during U.S. trading hours.
Its disadvantages are its relatively high annual fee and extreme concentration in SK Hynix and Samsung Electronics.
FLKR: A Better Low-Cost Passive Alternative
For a long-term investor seeking passive Korean exposure, the Franklin FTSE South Korea ETF, or FLKR, may be the more attractive choice. But also up in after hours tonight as Kospi craters.
FLKR charges an expense ratio of just 0.09 percent, compared with 0.59 percent for EWY. The difference amounts to approximately $50 each year for every $10,000 invested.
FLKR held 157 securities and had approximately $1.23 billion in assets as of July 7, 2026. It therefore reaches farther down the Korean market than EWY and does so at a fraction of the annual cost.
But FLKR does not solve the central risk problem. It is also market-cap weighted, has approximately half its portfolio in information technology and lists SK Hynix and Samsung Electronics as its two largest holdings. It remains exposed to the won and to the mismatch between Korean and American trading hours.
FLKR is best understood as a less expensive version of broadly similar Korean exposure, not as an escape from the risks analyzed in this article.
Its liquidity is also weaker. FLKR’s reported 30-day median bid-ask spread was 0.20 percent as of July 7, compared with 0.03 percent for EWY as of July 24. For an investor making infrequent purchases and using limit orders, the lower annual fee may outweigh that difference. For an active trader, EWY’s liquidity may remain decisive.
MKOR: Less Megacap Concentration at a Higher Cost
The Matthews Korea Active ETF, or MKOR, provides a more meaningful response to the concentration problem.
Unlike EWY and FLKR, MKOR is actively managed and can depart substantially from market-cap index weights. As of July 28, 2026, Samsung Electronics represented 18.4 percent of MKOR, while SK Hynix represented only 3.6 percent. Samsung’s preferred shares added another 2.7 percent.
MKOR was also less heavily weighted toward information technology than its benchmark and more heavily invested in industrial and smaller Korean companies. It therefore provides a broader economic interpretation of Korea than the market-cap-weighted alternatives.
That diversification is not free.
MKOR charges 0.79 percent annually. It had approximately $129 million in assets as of July 27 and a reported median bid-ask spread of 0.29 percent as of July 24. Trading volume was much lower than for either EWY or FLKR.
Active management introduces another tradeoff. When Samsung and SK Hynix lead a powerful semiconductor rally, a fund that deliberately reduces their weights may lag the market. Through June 30, 2026, MKOR had substantially underperformed its benchmark over the year-to-date and one-year periods.
That does not prove the strategy is inferior. It demonstrates the price of reducing concentration: investors gain a less top-heavy portfolio but accept higher fees, active-management risk and the possibility of missing part of a megacap-led advance.
The Practical Choice
The alternatives can be summarized simply.
EWY is the strongest trading vehicle. Its size, volume and narrow spreads are difficult to match.
FLKR is probably the strongest long-term passive choice. It offers broadly similar Korean exposure at a much lower annual cost, but it retains most of EWY’s semiconductor, currency and time-zone risks.
MKOR is the most credible choice for reducing megacap concentration. It provides a different portfolio rather than merely a cheaper version of the same index exposure, but its fees are higher and its liquidity is substantially weaker.
For an investor seeking genuine international diversification, however, the better answer may not be another Korea ETF. It may be a broad international or emerging-markets fund in which South Korea is only one component.
That approach dilutes the potential gains from a Korean semiconductor boom. It also spreads risk across more countries, currencies, industries and companies.
The real choice is therefore not merely between EWY, FLKR and MKOR. It is between making a deliberate single-country bet and allowing Korea to occupy a smaller place within a genuinely diversified portfolio.
The Bottom Line
Single-country ETFs offer convenient access to foreign markets, but convenience should not be confused with diversification, continuous pricing or guaranteed liquidity.
EWY is a concentrated investment in one country, one currency and, to a remarkable degree, two technology companies.
FLKR offers similar exposure at a much lower annual cost but does not eliminate the semiconductor concentration, currency exposure or overnight-repricing risks. MKOR reduces the dominance of the largest semiconductor companies, but it does so through a more expensive, actively managed and less liquid strategy.
When Seoul is open and New York is closed, the economic value of all three investments continues to change even if the price displayed by a U.S. brokerage appears frozen.
When meaningful American trading resumes, the market does not allow the investor to exit at yesterday’s price. It reprices the ETF to reflect what has already happened.
The lesson is not that EWY—or every Korea ETF—is defective. The lesson is that investors should understand exactly which Korean exposure they want and which risks they are willing to accept.
For active trading, EWY’s liquidity is difficult to match. For long-term passive exposure, FLKR’s lower cost makes it a strong alternative. For less megacap concentration, MKOR offers a distinctly different approach.
For genuine international diversification, however, the better answer may be not another Korea ETF but a broader fund in which Korea is only one component.
Position size matters. Currency exposure matters. Sector concentration matters. Trading hours matter. And a stop-loss order cannot protect an investor from a market that has already moved before the order has a chance to execute.
The ticker may sleep. The risk does not.
This article is for informational purposes and does not constitute individualized investment advice. Fund holdings, expenses, assets, spreads and other characteristics can change.