Currency movements can change your return on Korean stocks even when the share price does not move. A foreign investor has to account for two separate channels: translation of the stock’s won value and dividends into the investor’s home currency, and the effect of exchange rates on the company’s earnings, costs, financing and investor flows.
For a U.S. investor, USD/KRW means won per U.S. dollar. When USD/KRW rises, the won is weaker and an unchanged won investment converts into fewer dollars. When it falls, translation raises the dollar value, all else equal. The final result still depends on the stock return, dividends, timing, fees, taxes and whether the currency exposure was hedged.
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Two currency effects are present in every foreign investment
Direct translation of your holding
A Korean share is priced in Korean won (KRW). Your broker may show a gain in won, but your personal return is measured in your base currency. The conversion is performed both when you invest and when you sell, and dividends must be converted as well. This arithmetic effect exists even if the company has no economic exposure to foreign currencies.
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Indirect effects on the business and market
Exchange rates also change corporate results and the behavior of other investors. An exporter receiving dollars or euros may report more won revenue when the won weakens, while an importer paying for energy, components or inventory in foreign currency may face higher costs. Foreign-currency debt can become more expensive in won terms. Global funds may reduce Korean positions when a stronger dollar raises their funding costs or portfolio risk. These effects can push the share price in either direction and can offset or reinforce translation.
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How to calculate a dollar investor’s return
The total-return formula
For an unhedged investor, a useful approximation is:
Home-currency total return = (1 + KRW total return) × (1 + return of KRW in the investor’s home currency) − 1
For a U.S. investor using USD/KRW, the exact currency translation factor over the holding period is:
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The currency return is that factor minus one. Because the quote is won per dollar, a higher ending rate produces a negative won-to-dollar return. Use the same dates for the stock and exchange rate, include dividends consistently, and use the actual conversion rates available through your broker or custodian when precision matters.
Illustrative example
The following numbers are hypothetical and show the mechanics, not a forecast. Suppose a U.S. investor buys KRW 100,000,000 of shares when USD/KRW is 1,350. The shares produce an 8% total return in won, so the ending value is KRW 108,000,000. USD/KRW rises to 1,450 by the sale date.
| Calculation | Result |
|---|---|
| Starting dollar value | KRW 100,000,000 ÷ 1,350 = about $74,074 |
| Ending dollar value | KRW 108,000,000 ÷ 1,450 = about $74,483 |
| Won stock return | +8.00% |
| Currency return | 1,350 ÷ 1,450 − 1 = −6.90% |
| Combined dollar return | 1.08 × (1 − 0.0690) − 1 = about +0.4% |
The share rose 8% in Korea, but the weaker won absorbed almost all of the gain for this dollar investor. A euro, yen or other home-currency investor must use that currency’s own KRW conversion; the sign and size can differ from the dollar result.
What the formula leaves out
- Brokerage commissions, bid-ask spreads and custody charges reduce the realized return.
- Withholding taxes or other taxes can affect dividends and sale proceeds.
- Different trade dates, settlement dates or dividend payment dates can create a timing mismatch.
- A forward, swap, futures contract or currency-hedged fund changes the currency term and introduces hedge costs, collateral requirements, basis risk and tracking differences.
Why the won can change a Korean company’s earnings
Exporters and foreign-currency revenue
A company that invoices customers in dollars but pays a large share of its costs in won can see its won revenue and operating margin rise when the won depreciates. The benefit is smaller if it buys imported inputs, has substantial foreign-currency expenses or has already hedged its receipts. Pricing decisions and competition can also prevent an exporter from keeping the full currency benefit.
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Importers and foreign-currency costs
Businesses that import fuel, materials, equipment or merchandise may see costs rise in won when the currency weakens. Some can pass the increase to customers; others experience margin pressure. A company can have both export revenue and imported inputs, so its net exposure cannot be inferred from a broad sector label.
Foreign-currency borrowing
Debt denominated in dollars or another foreign currency becomes more expensive to service in won after depreciation. The accounting impact, cash-flow impact and any hedge can differ. Read the company’s financial statements and notes for the currency composition of revenue, costs, debt and derivatives before making a stock-specific claim.
How exchange rates influence Korean stock prices and capital flows
Global financing and risk channel
A 2024 study by Jin Woong Kim, summarized by the Statistics Research Institute in The Effect of Exchange Rate on Korean Stock Return in terms of Global Investment and catalogued by the Korea Citation Index, examines the dollar’s value and Korean stock returns using dollar betas and global-investment channels. Its summary describes a mechanism in which dollar appreciation raises global investors’ financing costs and portfolio risk, reducing investment and weighing on Korean returns.
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The available summaries do not provide numerical estimates or sample details, so the finding should be treated as a proposed, research-based transmission mechanism—not a rule that every Korean stock falls whenever the dollar rises. Company fundamentals, valuations, monetary policy and global risk appetite can dominate in a particular period.
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Investor hedging and market plumbing
The Bank of Korea notes that some foreign investors in Korean bonds obtain won through swaps rather than buying it directly in the spot market. That arrangement can allow investment without bearing exchange-rate risk over the investment horizon. Bond-market practice does not establish that all equity investors hedge, nor that hedging is free or perfect. For stocks, identify whether exposure is hedged and account for the hedge price, rollover, basis and timing before comparing results.
What determines the won’s direction
Market regime and benchmark rates
Korea has operated a free-floating exchange-rate system since December 1997, according to the Bank of Korea’s exchange-rate-system description. The basic KRW/USD market-average rate is a transaction-volume-weighted average of rates from the previous business day’s interbank transactions conducted through brokers. Banks set customer rates independently with reference to the interbank spot rate. Your executable rate can therefore differ from an indicative benchmark.
Several forces can move USD/KRW at once
The Bank of Korea cautions against a one-factor explanation. Its Issue Note 2026-9 describes a prolonged period since the second quarter of 2023 in which a wider current-account surplus coincided with real won depreciation. It says the influence of goods shocks weakened while demand for dollar assets and savings strengthened; the note is available at Structural Change in Korea’s External Sector and Its Implications on the Exchange Rates.
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How to compare two Korean-equity investments correctly
- Fix the investor perspective. State whether the result is for a U.S., European, Korean or other base-currency investor.
- Use identical dates. Match purchase, sale and dividend dates, and document the exchange-rate source used at each date.
- Calculate the local result. Compute the KRW price return and add dividends on a total-return basis.
- Calculate the currency contribution. For a dollar investor, divide the starting USD/KRW rate by the ending rate and subtract one.
- Combine the components. Multiply the two growth factors rather than simply adding percentages.
- Subtract real-world frictions. Include commissions, spreads, taxes, custody charges and conversion costs.
- Separate hedge versions. Show unhedged and hedged returns, with hedge costs and any tracking difference identified.
- Investigate business exposure. Read disclosures on foreign revenue, imported inputs, foreign debt and derivatives; do not assume a sector-wide exposure applies to a particular company.
Hedged and unhedged Korean-stock returns
| Exposure | Currency movement for a dollar investor | What appears in the result |
|---|---|---|
| Unhedged shares or fund | USD/KRW rises | Negative translation effect, in addition to the share and dividend return |
| Unhedged shares or fund | USD/KRW falls | Positive translation effect, all else equal |
| Currency-hedged exposure | USD/KRW rises or falls | Most translation is offset according to the hedge, but costs, rollover, basis and tracking differences remain |
A hedge changes the question from “What did the Korean asset return in dollars?” to “What did the Korean asset return after the chosen hedge?” Report the hedge ratio, instrument, dates and costs whenever those details are available.
What happens when the won weakens?
For a U.S. investor
If USD/KRW rises, an unchanged KRW holding is worth fewer dollars. A Korean company with net dollar revenue may simultaneously gain earnings support, potentially helping its share price; a company dependent on imported inputs or foreign debt may face the opposite. The stock response can therefore offset, amplify or ignore the translation loss.
For a Korean investor
A weaker won does not create the same translation loss because the investor’s base currency is KRW. The investor instead experiences any effects on company profits, imported prices, interest rates and market flows. A foreign investor’s dollar result cannot be used as a proxy for a Korean resident’s return.
For investors using another foreign currency
Measure the KRW against that currency over the same holding period. A move that hurts a dollar investor can have a smaller effect, no effect or the opposite effect for an investor whose home currency moved differently.
Recent cross-border flow data: useful context, not a return forecast
The Bank of Korea’s July 2026 Issue Note 2026-15 reports that Korean residents’ portfolio investment abroad was USD 140.3 billion in 2025, compared with USD 67.0 billion in 2024. It also reports overseas portfolio investment equal to 7.5% of GDP in 2025, up from 3.6% in 2024. The figures are presented in The Effects of Overseas Investment and Investment Income on the Exchange Rate, Issue Note 2026-15.
These are outward investments by Korean residents. They are not measurements of foreign purchases of Korean shares, Korean-stock returns or a prediction of what USD/KRW will do next. They illustrate how cross-border asset demand can become part of exchange-rate dynamics.
Common mistakes to avoid
- Reporting only the won return. That omits the currency result for a foreign investor.
- Reversing the USD/KRW sign. A higher number means a weaker won, not a stronger one.
- Adding stock and currency percentages. Returns compound; use the multiplication formula.
- Ignoring dividends. Compare total return with total return, not a price index with a dividend-inclusive result.
- Assuming exporters always win. Imported costs, competition, debt and hedges may change the net effect.
- Treating the exchange rate as a stock signal. The won has multiple, changing drivers, and a currency move does not mechanically predict the broad Korean market.
- Calling a hedge free. Forward points, swap pricing, collateral, rollovers and tracking differences all matter.
- Using a generic benchmark rate for settlement. The rate offered by your bank, broker or custodian may include a spread and differ from the market-average reference.
A practical worksheet for your next return calculation
Record the share quantity, purchase price, sale price, cash dividends, withholding tax, all trading and conversion fees, the investor’s base currency, and whether a hedge was used. Record the KRW/USD rate at each cash-flow date from a consistent source, then calculate a KRW total return, a currency return and the combined home-currency return. Finally, reconcile the result to the cash that actually arrived in the investor’s account. This process makes clear whether a disappointing result came from the company, the won, transaction friction or the interaction of all three.
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