Threats to the Won/Dollar Exchange Rate Defense and Foreign Capital Flight: The Hidden Trigger of the KOSPI Plunge

Behind the KOSPI Plunge: The Vicious Cycle of Rising Exchange Rates and Foreign Sell-offs

On June 23, 2026, the KOSPI market experienced a significant drop, triggering a circuit breaker. While the surface causes include the decline of U.S. tech stocks and concerns over the Federal Reserve's prolonged high-interest rates impacting the semiconductor sector, the underlying trigger is the macroeconomic vicious cycle of a rising won/dollar exchange rate and foreign capital flight.

According to market data, foreign investors led the index decline by recording massive net selling in the spot market. This goes beyond simple profit-taking; it strongly indicates a portfolio restructuring aimed at avoiding FX losses driven by the strong dollar trend.

Foreign Exchange Authorities' Defense and Market Perspectives

As the won/dollar exchange rate consistently threatens psychological resistance levels, market participants are paying keen attention to whether foreign exchange authorities will intervene through smoothing operations. While voices in retail investor communities are urging active government defense of the exchange rate, the macroeconomic environment remains challenging.

• Intensifying Strong Dollar Pressure: Concerns about entrenched inflation in the U.S. and the Fed's hawkish stance continue to support the strong dollar.
• Preference for Safe Assets: As global stock market volatility expands, capital is concentrating on traditional safe-haven assets such as the dollar and gold.
• Korea-U.S. Interest Rate Gap: The interest rate differential between South Korea and the U.S., remaining at a record high, is a structural factor constraining the appreciation of the won.

Foreign Capital Outflow Pathways and Impact on the Domestic Market

A rising exchange rate (depreciation of the won) means FX losses for foreign investors holding domestic stocks. This naturally leads to selling pressure, and the process of converting the sold funds into dollars for repatriation creates a vicious cycle that pushes the exchange rate even higher.

Sell-offs Concentrated in Large-Cap Export Stocks

A notable feature of this market crash is that foreign selling was concentrated in large-cap semiconductor stocks at the top of the market capitalization. As controversies over peaking semiconductor cycles coincided with fears of an AI bubble burst, highly liquid large-cap stocks became the primary targets for capital withdrawal.

Although retail investors attempted bottom-fishing to absorb the selling volume, it was insufficient to reverse the trend amid deteriorating macroeconomic indicators and exchange rate instability.

Future Outlook: Exchange Rate Stabilization is the Prerequisite for a Rebound

Experts point out that a meaningful rebound in the KOSPI market requires, above all, the stabilization of the won/dollar exchange rate. The supply and demand imbalance can only be resolved when the strong dollar trend subsides and the foreign selling spree slows down.

Rather than dwelling on short-term index fluctuations, it is time for investors to focus on risk management by closely monitoring inflation indicators that gauge the Fed's future monetary policy direction, major corporate earnings reports, and policy responses from foreign exchange authorities.