BofA: Index Rebalancing Outflows Fade, USD/KRW Buying Pressure Nears End

Summary：Bank of America reports that mechanical sell-off pressure on the South Korean won driven by stock index rebalancing has largely ended. As market pullbacks eliminate overweight positions, future capital flows will depend on the stability of VKOSPI.

A recent report from Bank of America indicates that the mechanical selling pressure on the Korean won, triggered by stock index rebalancing, has largely ended. The most challenging period for the won (USD/KRW), due to passive selling by index rules, is now over.
The previous volatility in the Korean stock market caused leading stocks like Samsung Electronics and SK Hynix to hit their weight limits, triggering automatic reductions by tracking funds and generating significant forex market hedging demand.
With the completion of a new round of index reviews, the related mechanical drag has essentially reached zero, and future capital flows will depend more on the stability of the Korean Volatility Index (VKOSPI).

Mechanical Pressure from Index Rebalancing Mostly Exhausted

Bank of America's latest quantitative model shows that the dollar buying pressure from stock index rebalancing is nearing its end. After significant adjustments, the passive outflow effect caused by benchmark weight restrictions has essentially reached zero following the latest review cycle. This indicates that the core mechanical selling factor that previously suppressed the won's exchange rate has been eliminated, and market capital flows are gradually returning to being driven by fundamentals.

Leading Stock Weight Triggers Passive Reduction Mechanism

This round of passive selling mainly stemmed from the high proportion of Samsung Electronics (005930:KS) and SK Hynix (000660:KS) in the Korean Composite Stock Price Index (Kospi), which triggered the holding limit constraints of index funds. Against the backdrop of the Korean market significantly outperforming the emerging market index, the global funds' overweight position in the Korean stock market has been corrected with the recent approximately one-third sector adjustment, effectively alleviating market valuation revaluation pressure.

Exchange Rate Market Risk Appetite and Volatility Recovery

After a decline earlier in 2026, the won achieved a strong rebound of about 8% in July. Bank of America's regression model successfully captured about one-third of the daily capital flow volatility and accurately tracked the cumulative capital outflow for the year. As index-driven selling pressure subsides, cross-border capital risk appetite is stabilizing again, and the exchange rate market's marginal sensitivity to the macro environment is beginning to rise.

Market Volatility Becomes Key Variable for Subsequent Capital Flows

Currently, the overweight position of the Korean stock market relative to emerging markets has been largely eliminated, and subsequent capital flows will no longer be indiscriminately dragged by rule constraints. Whether the last potential wave of capital withdrawal occurs will mainly depend on whether the Korean Volatility Index (VKOSPI) can remain stable. If market volatility stabilizes significantly, institutional risk budgets will be released again, providing valuation support for won assets.

Risk Warning and Disclaimer

The market carries risks, and investment should be cautious. This article does not constitute personal investment advice and has not taken into account individual users' specific investment goals, financial situations, or needs. Users should consider whether any opinions, viewpoints, or conclusions in this article are suitable for their particular circumstances. Investing based on this is at one's own responsibility.

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Written byTraderKnows

Created date:2026-08-03 14:49

Last Updated:2026-08-03 15:09

Independent Analysis: Manually researched and fact-checked by the TraderKnows Compliance Team, based on public regulatory records.

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U.S. Dollar Index

The calculation of the US Dollar Index typically takes into account factors such as trade volumes and foreign exchange reserves between the United States and other countries, primarily including major currencies such as the euro, yen, pound sterling, Canadian dollar, Swedish krona, and Swiss franc.