USD/KRW FX Risk When Buying Korean Stocks
Your dollar return on an unhedged Korean stock depends on both its won price and the exchange rate when you buy and sell. If USD/KRW rises, each won converts into fewer dollars. A gain shown on a won-denominated chart can therefore shrink or disappear after conversion, before fees, taxes, and dividends.
Reviewed
- USD/KRW is won per dollar; a higher rate means a weaker won.
- Use entry and exit exchange rates to measure a dollar price return.
- Keep portfolio currency conversion separate from the company’s operating exposure.
Convert each end of the investment
Let P be the stock price in won and X the exchange rate in won per dollar. The dollar price is P ÷ X. The unhedged dollar price return is (P_exit ÷ P_entry) × (X_entry ÷ X_exit) − 1. This is an algebraic identity, not a forecast. It excludes dividends, fees, taxes, and hedging.
Use price dates, not today’s conversion twice
On a stock chart, record both observation dates. Use matching FX observations for a historical return instead of converting both endpoints at today’s rate. If a chart adjusts for splits or dividends, establish that convention before combining it with another data series. A USD reference valuation is useful for scale but is not automatically your realized return.
Read the reporting currency and units
OpenDART exposes the currency of financial-statement amounts. Check that currency and the document’s units before comparing a DART value with a dollar figure on Korean Tickers. Use the original reported amount for reconciliation, then document the FX rate and date used for your own conversion.
Investigate operating exposure separately
For Samsung Electronics, open the relevant financial report and inspect its currency-risk disclosures before assuming that a weaker won benefits the business. Look for sales, costs, monetary assets and liabilities, and hedges by currency. The translation of your investment into dollars and the company’s operating sensitivity are different calculations.
Common questions
Does a won-price gain guarantee a dollar gain?
No. Apply the entry and exit exchange rates to the corresponding prices. Won depreciation can offset the share-price gain; transaction costs and taxes can reduce the result further.
Can I use the current USD reference value as my historical return?
No. A reference conversion describes a value using its stated rate. A historical return needs prices and exchange rates at both endpoints, plus any cash flows and costs relevant to your investment.