AI hardware demand is re-rating Korean stocks, but in a highly volatile market it is better to invest, not chase

Overview

The report centers on the theme that the AI wave is reshaping views on Korean stocks. It introduces South Korea's trading system, regulatory framework, financing and delisting rules, short-selling arrangements, and foreign-investor access, and further analyzes market structure, investor structure, earnings valuation, historical bull-bear cycles, and sector rotation. The core conclusion is that AI hardware demand is reinforcing the earnings flexibility of South Korea's semiconductors and high-end manufacturing assets, driving a powerful KOSPI rally; however, the Korean market also features high single-stock concentration, a high retail trading share, strong foreign influence, high volatility, and sensitivity to U.S. dollar liquidity.

Core views

First, AI hardware demand is the core catalyst behind this round of Korean stock gains, and earnings rather than valuation expansion have made the main contribution. Second, the Korean stock market is not a low-volatility, long-bull market; historically it has featured short bulls and long bears, with large-cap style outperformance. Third, the semiconductor cycle, macroeconomic conditions, and U.S. dollar liquidity have a marked impact on Korean stocks; in particular, U.S. dollar liquidity matters more than domestic Korean liquidity. Fourth, on the institutional side, longer trading hours and easier foreign access in Korea should help improve market attractiveness, but short-selling policy and delisting rules are still heavily shaped by regulation. Fifth, in terms of strategy, investors should focus on industrial themes and earnings trends, but should avoid simply chasing strength in a volatile market.

Analysis framework

The report combines institutional review, market structure decomposition, historical backtesting, and driver analysis: first it explains South Korea's trading, financing, delisting, short-selling, and foreign-investor regimes; then it characterizes market features from industry concentration, chaebol structure, investor structure, earnings and valuation contributions, and index performance; finally, it uses bull-bear cycles since 1980, macro and industry correlations, U.S. dollar liquidity, geopolitics, and sector rotation to judge the medium-term opportunity set and risks in Korean stocks.

Methodology notes

• Market institution researchTrading and regulatory framework review

  Understand market investability through trading hours, ATS, IPOs, delisting, short selling, and foreign-account rules.

  The report argues that trading convenience in Korea has improved, but short-selling and delisting systems still carry a strong regulatory imprint, so investors must assess both efficiency gains and policy uncertainty.

• Market structure analysisMarket-cap concentration and chaebol structure analysis

  Judge the source of index performance through CR2, CR10, industry market-cap distribution, and the share held by the four major chaebols.

  Samsung Electronics, SK Hynix, and the major listed entities tied to the four chaebols carry extremely high weights on the main board, so Korean index performance depends heavily on a small number of high-end manufacturing and semiconductor leaders.

• Cycle reviewBull-bear cycle and style review

  Compare historical bull-market duration, bear-market duration, volatility, drawdowns, and large-cap versus small-cap performance.

  The report concludes that Korea's bull markets are shorter than its bear markets on a median basis, and that large caps generally outperform small caps in both returns and stability.

• Driver analysisEarnings, valuation, industry cycle, and liquidity decomposition

  Separate the effects of EPS, PE, semiconductor conditions, GDP, U.S. dollar liquidity, and Korea's domestic interest rates.

  The report emphasizes that earnings are the main driver of this round of Korean stock gains, and that the semiconductor cycle and U.S. dollar liquidity are key variables for identifying turning points.

• Sector rotation researchIndustry themes and defensive-sector rotation

  Observe the leading industries, broker stocks, and defensive sectors at different stages of a bull market.

  Bull markets are often accompanied by a clear industry theme; leading industries tend to perform strongest in the middle-to-late stages, while power and gas, telecommunications, non-metals, and insurance have some defensive value.

Asset mapping & comparison

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

• KOSPI

  South Korea's core main-board index and the primary vehicle for the report's discussion of Korean stock gains, earnings-driven moves, and historical bull-bear cycles.

  Strengths

  Supported by AI hardware and semiconductor leaders' earnings; large-cap style has outperformed small caps over the long run, and the main board has strong liquidity and benchmark representation.

  Weaknesses

  The index is highly concentrated in a few chaebols and semiconductor leaders, and is easily hit by industry cycles, foreign capital flows, and U.S. interest-rate changes.

  Comparison

  The report sees large caps as better than small caps, the main board as better than the venture board, and TMT themes as better than broad benchmarks.

  Risks

  High volatility, large drawdowns, tighter U.S. dollar liquidity, a peaking semiconductor cycle, geopolitical risks, and policy disruptions.

• KOSDAQ

  South Korea's venture board, with a large number of listed companies and a relatively high weight of pharmaceuticals and biotech.

  Strengths

  Listing standards are relatively looser than on KOSPI, and pharmaceuticals/biotech and growth companies are more concentrated.

  Weaknesses

  Total market cap is lower than on the main board; tighter delisting rules are mainly concentrated on KOSDAQ, creating greater pressure for quality cleansing.

  Comparison

  The report is relatively more favorable to the main board and large-cap style, and believes the main board is better than the venture board.

  Risks

  Higher delisting standards, liquidity and quality divergence, and valuation volatility in growth stocks.

• Samsung Electronics

  One of the largest-weight assets on the South Korean main board, and an important representative of the semiconductor and AI hardware chain.

  Strengths

  Benefits from AI hardware demand and the semiconductor cycle; it accounts for a high share of main-board market cap and contributes significantly to KOSPI.

  Weaknesses

  Highly dependent on global semiconductor conditions and external demand, and may drag on the index when the cycle matures.

  Comparison

  Together with SK Hynix, it is one of the main drivers of KOSPI market-cap expansion.

  Risks

  A downturn in the semiconductor cycle, slower global demand, tighter U.S. dollar liquidity, and valuation volatility.

• SK Hynix

  One of South Korea's semiconductor leaders, and together with Samsung Electronics forms the core driver of KOSPI.

  Strengths

  Has earnings elasticity in the context of AI hardware demand and carries a high main-board market-cap weight.

  Weaknesses

  The industry cycle is strong, making it sensitive to changes in memory and AI hardware demand.

  Comparison

  Together with Samsung Electronics, it has a huge impact on South Korea's main-board market cap and index performance.

  Risks

  A reversal in the semiconductor cycle, slower AI capital spending, foreign outflows, and highly volatile trading.

• NEXTRADE-covered stocks

  The core stock pool that can trade during extended hours under Korea's trading-reform framework.

  Strengths

  Longer trading hours and lower fees make it easier for cross-time-zone investors to rebalance.

  Weaknesses

  It is not an exchange; it does not yet support ETFs, bonds, or other products, and KRX remains the main market.

  Comparison

  Compared with KRX, NEXTRADE offers a longer trading window and lower trading fees.

  Risks

  The trading system is still developing, and product coverage and liquidity depth remain limited.

• Defensive sectors

  Sectors such as power and gas, telecommunications, non-metals, and insurance are viewed by the report as having defensive value.

  Strengths

  High dividend yields and relatively stable demand help reduce portfolio volatility in high-volatility environments.

  Weaknesses

  In a strong industry-theme bull market, their flexibility may be weaker than semiconductors, manufacturing, and securities.

  Comparison

  More defensive than the AI and semiconductor themes, and suitable for observation when volatility rises or the main theme fades.

  Risks

  Interest-rate changes, policy pricing, weakening sector fundamentals, and a shift in market risk appetite.

Key data

• KOSPI gain in the current cycle236.0%Since April 2025 through 2026/05/14, the report says KOSPI has gained 236.0% cumulatively.
• NEXTRADE trading window8:00-20:00; about 11.5 hours of continuous tradingNEXTRADE offers extended trading hours, covering about 650 core stocks, but does not support ETF products and other KRX-exclusive products.
• KRX regular continuous trading durationabout 6.5 hoursThe Korea Exchange's regular continuous trading runs from 9:00 to 15:30, with separate opening and closing auction sessions.
• Number of stocks listed on the KOSPI main board840 stocksAs of 2026/05/12, the main board's total market cap was about 6072.9 trillion won.
• Number of stocks listed on KOSDAQ1797 stocksAs of 2026/05/12, the KOSDAQ market's total market cap was about 661.1 trillion won.
• High-end manufacturing market cap share52.9%The combined market-cap share of high-end manufacturing industries such as hardware equipment and semiconductors as of 2026/05/12.
• Main-board CR10 market cap share60.5%As of 2026/05/12, the main board's top ten listed companies accounted for 60.5% of market cap.
• Samsung Electronics and SK Hynix market cap share48.4%The table of contents and chart information show that as of 2026/05, CR2 market-cap share was 48.4%.
• Impact of the four major chaebols on main-board market capnearly 70%If the main listed entities within Samsung, Hyundai, LG, and SK groups are included, the four major chaebols account for nearly 70% of main-board market cap.
• Median trading share of individual investorsover 50%Since 2008, the median share of trading by individual investors has exceeded 50%, falling to 43.7% in 2025.
• Trading share of foreign institutions34.7%The report says the share of foreign institutions has gradually risen to 34.7%.
• Correlation between South Korean GDP and Korean stock returns52.2%Since 1998, the correlation between South Korea's GDP trend and Korean stock returns has been as high as 52.2%.
• Median bull-market duration408 trading daysThe median bull-market duration in Korea since 1990.
• Median bear-market duration726 trading daysThe median bear-market duration in Korea since 1990.
• KOSPI maximum drawdown patterntypically above 30%The report notes that high concentration and investor structure often make KOSPI's maximum drawdown exceed 30%.

Impact & implications

For investors, the appeal of Korean stocks comes from AI hardware demand, the semiconductor upcycle, and the earnings elasticity of high-end manufacturing leaders; but the risks are equally concentrated in the late stage of the industry cycle, tighter U.S. dollar liquidity, foreign outflows, retail sentiment swings, and policy intervention. The implied allocation approach is to focus on earnings-driven Korean large caps and TMT-related assets, while controlling the risk of chasing strength by watching valuation troughs, funding divergence, volatility spikes, and the U.S. interest-rate environment.

Risks

• Leveraged funds may amplify volatility in the Korean market.
• Geopolitical conflicts may slow output and disturb market risk appetite.
• Changes in the global liquidity environment, especially tighter U.S. dollar liquidity, may trigger a pullback in Korean stocks.
• If the semiconductor cycle enters its late stage, the current earnings-driven logic may weaken.
• Retailization in the Korean market and the high share held by foreign investors make it easy for sentiment and cross-border capital flows to have an outsized effect.
• Short-selling, delisting, and foreign-investor rules are subject to strong regulatory adjustments, so policy uncertainty cannot be ignored.

What to watch

• Whether AI hardware demand and the global semiconductor cycle can continue to support the earnings of leaders such as Samsung Electronics and SK Hynix.
• The impact of U.S. dollar liquidity, the 10-year U.S. Treasury yield, and Federal Reserve policy changes on KOSPI valuation and foreign capital flows.
• Whether KOSPI valuation has reached historical discount extremes, and whether forward P/E, funding divergence, and volatility show turning-point signals.
• The divergence between foreign and retail trading behavior, especially foreign inflows and outflows and changes in the trading share of individual investors.
• NEXTRADE expansion, foreign account facilitation, and progress on related systems for inclusion in the MSCI developed markets index.
• After tighter delisting rules, improvement in KOSDAQ market quality and the associated cleansing pressure.
• The intensity of geopolitical events such as inter-Korean relations and their impact on industrial output and risk appetite.
• Rotation within the main industry themes in the middle-to-late stage of the bull market, and the performance of sectors such as securities, electrical equipment, machinery and equipment, and manufacturing.