Seoul's Market Momentum Halts as Risk Aversion Sweeps Across Asia

For most of 2025, South Korea appeared immune to the global volatility plaguing other markets. While international investors retreated from artificial intelligence plays and reassessed their positions, Seoul’s stock exchange continued its impressive climb. Yet this resilience came to an abrupt end as a wave of risk aversion swept across the region, forcing a sharp reassessment of market valuations and investment confidence.

The turning point arrived with a dramatic reversal that caught many off guard. What began as a typical market correction quickly evolved into a broader crisis of confidence, as traders grappled with mounting uncertainties surrounding global monetary policy and the durability of the AI boom that had fueled Seoul’s bull run.

The Collapse: Numbers That Tell the Story

The numbers painted a stark picture of the reversal. The Kospi index fell 5.3%—marking its steepest descent since April 7. This magnitude of decline triggered automatic halts in program trading on the main board, a sign of the speed and severity of the selloff.

The sector most exposed to the emerging risk aversion was semiconductors. Samsung Electronics and SK Hynix, the two pillars of Korea’s tech industry, each surrendered more than 6% of their value as investors liquidated positions in memory chip manufacturers. The Korean won joined the retreat, depreciating as much as 1.6% against the dollar to reach 1,464.75 per unit—its worst single-day performance since October.

The damage extended beyond Seoul. Across the Asia-Pacific region, the MSCI Asia Pacific Index fell over 2%, with technology shares bearing the brunt of profit-taking and sentiment shifts. The synchronization of declines across multiple markets underscored the contagion of risk aversion from one economy to the next.

What Sparked the Reversal?

Multiple catalysts converged to trigger the shift in market psychology. Speculation around Kevin Warsh’s potential nomination as the next Federal Reserve chair created anxiety about future interest rate trajectories. More immediately damaging, however, was Jensen Huang’s clarification that Nvidia’s anticipated $100 billion investment in OpenAI was never a firm commitment—news that immediately triggered profit-taking among investors holding AI-adjacent positions.

These developments arrived at a delicate moment. The market had grown accustomed to a steady diet of positive AI-related news flow. When that narrative stalled, the subsequent vacuum filled rapidly with doubt and caution. Position-squaring accelerated as traders moved to lock in gains from the year’s strong rally.

The Psychology of Market Retreat

Han Jiyoung, analyst at Kiwoom Securities, captured the abruptness of the mood swing: “Optimism dominated discussions just weeks earlier, but the sudden sharp decline unleashed panic selling across the board. Yet Korea’s core bull market drivers—robust corporate profitability and favorable valuation multiples—remain firmly in place.”

Gary Tan, portfolio manager at Allspring Global Investments, attributed much of the selling to tactical repositioning. “Jensen’s comments likely altered sentiment in the near term, particularly for AI-linked equities that saw explosive gains this year. The main consequence was a cascade of profit-taking that reversed previously crowded positions.”

The retreat also reflected a broader technical dynamic. Cameron Chui, equity strategist at JPMorgan Private Bank, noted that “technical selling may be amplifying the decline as money managers book gains from the strong year-to-date performance of memory chip stocks and the Korean market more broadly.”

The Broader Context: Why Korea Was Vulnerable

Seoul’s recent market leadership stemmed from intense global appetite for memory chips destined for AI infrastructure. The Kospi had climbed to become the world’s tenth largest equity market by capitalization, surpassing Germany with a valuation exceeding $3.3 trillion, trailing only Taiwan among Asia’s major exchanges. Just recently, the index had crossed the historic 5,000-point threshold—a symbolic milestone set by national leadership. Monday’s decline sent it below that level, erasing the recent psychological victory.

The Korean market’s outsized gains this year—up over 17% despite the recent correction—had paradoxically made it a prime target for profit-takers. Both Samsung Electronics and SK Hynix had reached successive new highs, their recent earnings demonstrating robust profit expansion. This success, however, had attracted the kind of concentrated positioning that makes markets vulnerable to sudden reversals when sentiment shifts.

On the Monday of the selloff, both domestic institutional money and foreign capital were net sellers. Individual Korean investors, by contrast, stepped into the breach as buyers—a pattern often associated with late-stage momentum reversals.

Reading the Tea Leaves: Opportunity or Warning?

Jung In Yun, CEO of Fibonacci Asset Management Global, took a contrarian view. “The current selloff in AI-related positions on the Kospi may represent an attractive entry point. The underlying economy shows no meaningful deterioration—orders remain steady, capital spending plans remain intact, and the long-term structural demand for AI infrastructure persists.”

This perspective highlights a key tension: are the recent declines a cleansing correction that presents buying opportunities, or do they signal deeper concerns about the sustainability of AI-driven valuations?

The evidence suggests the former interpretation may have stronger footing. Samsung and SK Hynix’s latest financial results revealed strong profit growth, validating the investment thesis behind Korea’s tech sector. Fundamental business momentum appears intact even as sentiment has shifted sharply.

Whether this marks a healthy consolidation within a larger uptrend or the initial stages of a more extended pullback remains uncertain. What is clear is that risk aversion has reasserted itself as a dominant market force after months in the background, reminding investors that even the most compelling growth narratives must occasionally pause for valuations and sentiment to reset.