BCA Research finds that portfolio flows are now the primary driver of South Korea's foreign exchange and equity markets, a shift that has increased volatility in the KOSPI and left the won less tethered to its underlying fundamentals.
The research house says this environment may offer a tactical entry to position for Korean won appreciation, on the expectation that outflow pressure will moderate and policy support will rise. BCA characterises the starting point for South Korean assets as the second half of 2026, where extraordinary equity momentum meets mounting macro fragility.
On the equity side, the KOSPI has emerged as the strongest-performing major index this year, advancing by more than 100% amid the surge in the AI semiconductor cycle. Market concentration has increased substantially: Samsung and SK Hynix together now comprise over 50% of the index's total market capitalisation, heightening concentration risk and singular-theme exposure.
Price action in recent trading has exhibited sharp two-way swings, a pattern BCA associates with parabolic equity moves often seen in late-cycle rallies. The firm draws a parallel with the late 1990s technology bubble, noting similarities in how a major equity benchmark and measures of implied volatility can rise in tandem.
According to BCA, the current dynamic reflects an ascendance of sentiment and speculative flows over the broader macro backdrop. That dominance, in turn, has contributed to the won's detachment from what the firm's assessment suggests are otherwise strong fundamentals.
For investors, BCA highlights an actionable viewpoint: if capital outflows cool and policymakers step in with supportive measures, there could be scope for the won to regain value. The firm frames this as an opportunity to position for appreciation, contingent on the stabilization of flow dynamics and policy developments.
In sum, BCA presents a market where elevated equity momentum driven by a concentrated semiconductor theme sits alongside rising macro vulnerabilities, producing higher equity volatility and a foreign exchange rate that appears disconnected from fundamentals.
What this means
- Portfolio flows are the dominant market force for both FX and equities in South Korea.
- KOSPI volatility has risen as the index rallies, with recent price action showing pronounced two-way swings.
- BCA flags a potential trade for won appreciation if outflow pressures moderate and policy support increases.