In July 2026, the South Korean stock market underwent a dramatic correction.
On July 20 (Beijing time), the Korea Composite Stock Price Index (KOSPI) closed at 6,516.27, down 304.33 points or 4.46% from the previous trading day. During the session, it briefly dropped to 6,472.80, falling below the 6,500 mark. The KOSDAQ, South Korea’s tech-heavy index, closed at 749.64, down 5.33%. Both markets triggered their "circuit breaker" mechanisms, temporarily halting programmatic trading due to extreme volatility.
Looking at the first half of July, the KOSPI fell from 8,476.48 on June 30 to 6,820.60 on July 16. Between July 1 and 16, foreign investors were net sellers of about KRW 12.1 trillion in the KOSPI market and about KRW 338.1 billion in the KOSDAQ market. Over the same period, foreign investors were net buyers of about KRW 593.7 billion in South Korean ETFs.
Meanwhile, the Philadelphia Semiconductor Index pulled back more than 20% from its record high on June 22, officially entering a technical bear market. The Nasdaq Index also fell about 2.9% last week.
The market’s biggest question is straightforward: Does the large-scale exit of foreign capital from Korean equities signal the end of the AI semiconductor investment thesis?
Why Are Foreign Investors Selling Korean Stocks En Masse?
Excessive Concentration in Market Valuation
Recent gains in the Korean stock market have been heavily concentrated in the semiconductor sector. Samsung Electronics and SK Hynix together account for over 20% of the KOSPI’s weighting—and even more in the MSCI Korea Index. The AI boom has fueled explosive demand for HBM (High Bandwidth Memory) chips, drawing massive capital inflows into Korea’s semiconductor leaders. When market expectations shift, capital can exit just as quickly. High concentration brings high volatility—a structural characteristic that no single market can avoid.
Global Investors Reducing Exposure to Single Asian Markets
Institutional investors typically prioritize geographic allocation over sector allocation. When global macro uncertainty rises, portfolio managers first adjust regional weights rather than simply selling out of a sector. In the first half of July, foreign investors were net sellers of about $8.1 billion in Korean equities. At the same time, they were net buyers of U.S. Philadelphia Semiconductor Index ETFs and Nasdaq 100-related ETFs. This indicates that capital isn’t abandoning the AI sector, but rather reducing exposure to Korea as a single market and reallocating AI investments into more globalized asset vehicles.
High Volatility Drives Defensive ETF Strategies
Fund flow data shows that while foreign investors were selling Korean stocks, they were net buyers of the KODEX 200 ETF, KODEX Leveraged ETF, and KODEX 200 Inverse 2x ETF. The fact that products with opposite exposures are both among the top net buys suggests that investors aren’t simply bearish on Korea—they’re using ETFs for risk hedging and portfolio rebalancing. There’s also a clear divergence in flows into single-stock leveraged products: foreigners were net buyers of Samsung Electronics leveraged ETFs, but heavy net sellers of SK Hynix leveraged ETFs. This divergence shows that foreign investors have different outlooks for individual semiconductor companies, rather than being uniformly bearish on the entire sector.
Additionally, BlackRock’s iShares MSCI Korea ETF (EWY) attracted over $280 million in inflows last week, potentially setting a new weekly record for the fund. About a quarter of EWY’s assets are allocated to SK Hynix, with Samsung Electronics also holding a significant share. Long-term institutional investors are buying the dip via ETFs, in stark contrast to the large-scale deleveraging by short-term traders. The tug-of-war between these two forces highlights that the market is currently at a peak of bull-bear divergence.
SK Hynix and Samsung Electronics: Has the AI Semiconductor Cycle Peaked?
SK Hynix: Valuation Pressure on the HBM Leader
SK Hynix, with its HBM technology, has become a key supplier in NVIDIA’s AI GPU supply chain. Over the past year, the market has re-rated SK Hynix from a traditional memory cycle company to an AI infrastructure provider. But because this narrative is now fully recognized and priced in, SK Hynix has become one of the most heavily traded AI stocks.
Last week, SK Hynix shares saw extreme volatility—its ADR dropped over 9% on July 13, then soared more than 27% on July 14. Such dramatic swings reflect intense debate over the sustainability of HBM demand and the reasonableness of current valuations.
The market is now worried about two things: First, if tech giants like Google, Microsoft, and Amazon cut back on AI data center capital expenditures, will that impact demand throughout the GPU→HBM→memory supply chain? Second, as HBM supply ramps up, will future prices and margins come under pressure? Samsung Electronics and Micron Technology are also accelerating their HBM businesses, forcing investors to reassess the competitive landscape in the AI memory cycle.
Samsung Electronics: Structural Challenges for the Integrated Leader
On July 20 (Beijing time), Samsung Electronics closed down 4.31% at KRW 244,400, hitting a new low since May 6. Samsung still holds comprehensive advantages in memory chips, foundry, and the AI semiconductor supply chain, but faces competitive pressure from SK Hynix in HBM and ongoing challenges from TSMC in foundry. From July 1 to 16, foreign investors were net sellers of KRW 15.53 trillion in Samsung Electronics and KRW 21.92 trillion in SK Hynix. Meanwhile, retail investors bought about KRW 34 trillion of Samsung and SK Hynix shares, becoming the main buyers supporting these stocks.
Why Are Foreign Investors Buying U.S. Semiconductor ETFs Instead?
Foreign investors have been net buyers of U.S. Philadelphia Semiconductor Index ETFs and Nasdaq 100-related ETFs during the same period. This shift reveals a structural change in capital preferences: moving from bets on individual Korean semiconductor companies to allocations across the global AI supply chain.
NVIDIA (NVDA): The core supplier of AI GPUs. The expansion of AI data centers drives GPU demand, which in turn drives HBM demand, ultimately fueling growth across the semiconductor industry. Despite recent price pressure, NVIDIA’s market cap remains at about $4.91 trillion, slightly ahead of Apple, maintaining its position as the world’s most valuable company.
Broadcom (AVGO): A major beneficiary of AI ASIC chips. As large tech companies develop custom AI chips, Broadcom holds a key position in AI networking chips and custom ASICs.
AMD (AMD): Continues to challenge NVIDIA in the AI GPU and data center computing markets.
TSMC (TSMC): The world’s leading advanced process foundry, benefiting from manufacturing demand for AI chips from NVIDIA, AMD, and others.
Does the Korean Market Correction Signal an AI Bubble Burst?
In the short term, the market is being repriced. The Philadelphia Semiconductor Index has entered a technical bear market, and the Nasdaq’s price-to-earnings ratio has fallen to 39.1—still close to the critical 40 level. Tech stocks in Korea are facing significant bubble and leverage issues, compounded by rate hikes, so there’s still considerable pressure for a medium-term correction.
However, from a long-term perspective, demand for AI infrastructure remains robust. SK Group Chairman Chey Tae-won recently stated that global semiconductor demand will surge next year, with AI-related demand expected to rise 60% to 100% over this year. SK Hynix management also forecasts that 2027 could see the most severe memory supply shortage in history.
The key difference is this: In the past, investors bought the "AI concept." Now, they’re seeking "AI cash flow." The market is shifting from a narrative of "AI demand growth" to one of "AI profit realization." This transition doesn’t mean the end of the AI cycle—it means the investment thesis is evolving.
Three Key Indicators the Market Is Watching
AI Capital Expenditure by U.S. Tech Giants: Data center investment plans from Google, Microsoft, Amazon, Meta, and others will directly determine the scale of GPU and HBM demand.
HBM Prices and Orders: Contract prices, long-term agreements, and capacity utilization for HBM are direct indicators of whether the memory cycle is overheating.
AI Revenue Growth Rate: The ability of AI-related businesses to consistently outperform market expectations will determine the sustainability of current valuations.
Conclusion
The sharp correction in South Korea’s stock market in July does not mark the end of the AI investment cycle.
Foreign investors have exited KOSPI while buying both U.S. semiconductor ETFs and Korean ETFs, reflecting a global reallocation of capital within the AI supply chain—from regionally concentrated risk assets to global, diversified AI investment vehicles. Capital hasn’t left AI; it’s simply adjusting its portfolio structure.
Going forward, the core of market competition will shift from "who has the AI concept" to "who can consistently generate AI business revenue." For investors, the rivalry among Korean semiconductor leaders, U.S. AI chip companies, and global supply chain firms will define the next chapter for tech stocks.
High volatility itself is not the source of risk—misreading the logic behind the volatility is.
FAQ
Q1: Are foreign investors selling Korean stocks because they’ve lost faith in AI?
No. While selling Korean equities, foreign investors have been net buyers of U.S. Philadelphia Semiconductor Index ETFs and Nasdaq 100-related ETFs. This shows that capital isn’t abandoning the AI sector, but is reducing exposure to Korea as a single market and reallocating AI investments into global asset vehicles.
Q2: With the KOSPI down over 19% in July, has the Korean market entered a bear market?
The KOSPI fell from 8,476.48 on June 30 to 6,820.60 on July 16—a drop of about 19.6%. By technical definitions, this meets the criteria for a bear market. According to a Huaxi Securities research report, Korea has entered a technical bear market, but given the sharp short-term drop, an oversold rebound is possible.
Q3: Which is more noteworthy—SK Hynix or Samsung Electronics?
The two play different roles in the AI semiconductor cycle. SK Hynix leads in HBM memory and directly benefits from NVIDIA GPU demand, but its valuation and position concentration are high. Samsung Electronics has a more diversified business (memory, foundry, consumer electronics), but faces competitive pressure in HBM. Both face medium-term correction pressures.
Q4: The Philadelphia Semiconductor Index is in a bear market—what does this mean for global tech stocks?
The Philadelphia Semiconductor Index has dropped more than 20% from its June 22 record high, officially entering a technical bear market. This reflects a revaluation of semiconductor stocks and concerns over the sustainability of AI capital spending. However, it doesn’t mean the long-term growth story for semiconductors is over; rather, the market is moving from the "AI concept" phase to the "AI cash flow" verification stage.
