Reversal risk in high-momentum trades in Taiwan and Korea is rising significantly

Overview

The report argues that the momentum rally in Asian equities has entered a high-risk phase, with risk concentrated in Taiwan, Korea, and the technology sector. Strong performance over recent months has been driven by earnings upgrades, AI and semiconductor themes, valuation expansion, and crowded positioning, but these factors are now close to or at historical extremes. Recent pullbacks in Korean and Taiwanese momentum portfolios are viewed as early signals of a broader winner unwind and style rotation.

Core views

The core views are: first, high-momentum portfolios in Taiwan and Korea have posted large gains and have recently started to weaken; second, earnings expectations, valuations, crowding, and market dispersion are all in extreme territory, making momentum trades more vulnerable to reversal; third, the technology sector is especially fragile because high-momentum tech stocks have generated significant excess returns this year, carry high valuation premiums, and have record-level earnings revisions; fourth, the Taiwan and Korea markets have become the most concentrated expression of the Asian AI and semiconductor trade, meaning investors are effectively taking highly homogeneous risk in a small group of AI-related tech leaders; fifth, strategically, investors should increase anti-momentum exposure such as value, low volatility, and laggards.

Analysis framework

The report uses 15 key charts to assess the sustainability of Asian momentum trades, mainly comparing momentum returns, valuation indicators, earnings revisions, crowding, market concentration, risk premiums, and the state of the technology sector across markets such as Taiwan, Korea, China, India, and Japan. The analysis is not focused on single-company fundamentals, but instead evaluates whether high-momentum trading has entered a reversal-prone zone from the perspective of quantitative factors, style rotation, and market structure.

Methodology notes

• Quantitative factorsMomentum and anti-momentum rotation

  High-momentum portfolios are more likely to reverse after extreme gains, crowding, and valuation expansion.

  The report compares the recent returns, drawdowns, valuations, crowding, and earnings revisions of high-momentum stocks against historical ranges to assess whether momentum trading is shifting from trend continuation to reversal risk.

• Valuation analysisPB, EV/EBITDA, forward 12-month P/E, dividend yield, and equity risk premium

  When multiple valuation measures simultaneously approach extremes, the margin of safety for further upside diminishes.

  Valuations for the Taiwan and Korea markets as well as technology momentum portfolios are already elevated. Korea has record-high PB and EV/EBITDA and record-low dividend yield, while equity risk premiums in Japan, Korea, and Taiwan have fallen to record lows.

• Earnings expectationsNet earnings revisions

  Once the earnings upgrade cycle reaches an extreme, there is less room for further positive revisions.

  The report notes that earnings expectations for Taiwan momentum stocks are at record highs, while Korea is close to its 2009 peak. When valuations have already begun to correct while earnings expectations remain elevated, the market becomes more sensitive to negative revisions.

• Market structureConcentration, correlation, and crowding

  The higher the concentration, the more easily factor risk, sector risk, and market risk reinforce one another.

  Technology accounts for an extremely high share of market capitalization in Taiwan and Korea, and the top five stocks also carry very high weights. Taiwan factor correlations and Korea single-stock correlations are elevated, suggesting investors are increasingly just holding risk in the same group of AI-related tech leaders.

Asset mapping & comparison

Structured mapping from thesis to named assets (strengths, weaknesses, peers, risks).

• Taiwan high-momentum technology stocks

  Primary risk exposure

  Strengths

  Benefiting from AI and semiconductor themes, strong earnings upgrades, and standout year-to-date momentum performance.

  Weaknesses

  Valuations and earnings expectations are at extremes, technology accounts for about 85% of market capitalization, and concentration in the top five stocks is high.

  Comparison

  Compared with other Asian markets, Taiwan remains one of the most expensive markets in valuation terms.

  Risks

  Peaking earnings expectations, valuation derating, elevated factor correlations, and reversal of crowded trades.

• Korea high-momentum technology stocks

  Primary risk exposure

  Strengths

  The momentum portfolio is up 58% year-to-date, with clear support from technology and AI-related themes.

  Weaknesses

  Momentum has pulled back 13% over the past week, PB and EV/EBITDA are at record highs, and dividend yield is at a record low.

  Comparison

  Korea's top five stocks account for about 71% of market capitalization, a higher concentration than Taiwan.

  Risks

  Valuation derating, earnings upgrades nearing a peak, and elevated single-stock correlations leading to synchronized drawdowns.

• Asian high-momentum technology portfolio

  Vehicle for crowded trades

  Strengths

  About 61% excess return year-to-date, with strong momentum in earnings revisions.

  Weaknesses

  Valuation premiums are at high levels relative to the past twenty years, crowding has reached historical extremes, and room for further upgrades is limited.

  Comparison

  The report notes that current long-short valuation dispersion is high, but still has not reached 2000 levels.

  Risks

  If earnings expectations and valuations peak at the same time, technology momentum trades may reverse quickly.

• Value and low-volatility anti-momentum portfolios

  Recommended overweight direction

  Strengths

  They have the potential to benefit from style rotation when high-momentum trades become extremely crowded, and momentum in low-volatility stocks is at a record low.

  Weaknesses

  If AI and semiconductor earnings upgrades continue to exceed expectations, anti-momentum portfolios may continue to underperform in the short term.

  Comparison

  Compared with high-volatility, high-growth stocks, value and low volatility are more defensive and more aligned with mean reversion.

  Risks

  The timing of style rotation is uncertain, and allocation shifts may prove premature if the market continues to favor growth and momentum.

• Opportunities in Asian markets such as China, India, and Japan

  Direction for relatively diversified allocation

  Strengths

  The report mentions opportunities can be sought in Japan, China, and India, and some markets are already trading below average valuation levels.

  Weaknesses

  The report does not elaborate on detailed stock-specific or portfolio recommendations for these markets.

  Comparison

  Compared with Taiwan and Korea, some Asian markets have less extreme momentum crowding and valuation conditions.

  Risks

  Regional macro conditions, earnings downgrades, and differences in market style may affect rotation returns.

Key data

• Performance of high-momentum portfolios in Taiwan and KoreaTaiwan is up 86% year-to-date and Korea is up 58% year-to-date; over the past week, Korea has pulled back 13% and Taiwan 4%.The report views the recent pullback as a sign that cracks are starting to emerge in momentum trading.
• Excess returns of high-momentum Asian technology stocksHigh-momentum Asian technology stocks have contributed about 61% of excess returns year-to-date.At the same time, valuation premiums are at high levels relative to the past twenty years, while crowding and earnings revisions are also at historical highs.
• Market concentrationThe technology sector accounts for about 85% of Taiwan's market capitalization and 70% of Korea's; the top five stocks account for about 66% of Taiwan's market capitalization and 71% of Korea's.Such high concentration means country allocation is increasingly becoming a concentrated bet on a small number of AI and semiconductor leaders.
• Earnings expectationsEarnings expectations for the Taiwan market and Taiwan momentum stocks are at record highs, while Korea is close to its 2009 peak.The report believes the earnings upgrade cycle may be nearing its peak, leaving limited room to continue providing positive support.
• Valuation and risk premiumKorea's PB and EV/EBITDA are at record highs, while dividend yield is at a record low; equity risk premiums in Japan, Korea, and Taiwan have fallen to record lows.Valuation expansion combined with low risk compensation makes high-momentum trades more vulnerable to shifts in sentiment and earnings expectations.
• Data cut-offData in many charts are as of 2026-06-25.The report was published on 2026-06-29.

Impact & implications

The implication for portfolios is that the risk-reward of continuing to chase high-momentum technology stocks in Taiwan and Korea has deteriorated. If earnings upgrades peak or valuation derating continues, crowded trades could amplify drawdowns. The report recommends that investors reallocate part of their risk budget away from winners and high-volatility, high-growth stocks toward value, low volatility, and other laggards, while also looking for relative opportunities within Asia in markets such as Japan, China, and India.

Risks

• If AI and semiconductor earnings upgrades continue to exceed expectations, high-momentum technology stocks may continue to outperform, and reversal signals may be delayed.
• The report is mainly based on quantitative factors and market structure, and does not conduct bottom-up fundamental validation on all related stocks.
• The timing of a rebound in value and low-volatility styles is uncertain, and rotating too early may create short-term relative return pressure.
• The high concentration in Taiwan and Korea could also amplify gains if risk appetite continues to rise, not just magnify drawdowns during declines.
• Some chart text is drawn from summaries and chart titles, and detailed figures may require further verification against the original charts.

What to watch

• Whether momentum portfolios in Taiwan and Korea continue to pull back, especially whether Korea's recent 13% pullback spreads.
• Whether valuation derating in the technology sectors of Taiwan and Korea continues.
• Whether net earnings revisions fall back from record highs, especially in Taiwan and Korea technology.
• Whether crowding, factor correlations, and single-stock correlations in high-momentum trades continue to rise or begin to ease.
• Whether market concentration rises further and whether the contribution of the top five stocks to index performance continues to expand.
• Whether valuation metrics such as equity risk premium, dividend yield, PB, and EV/EBITDA remain at extreme levels.
• Whether value, low-volatility, and laggard portfolios begin to generate relative returns.