Nasdaq and KOSPI Plunge: What is Happening in the Current Stock Market?
Recently, both the US Nasdaq and the South Korean stock market have been experiencing significant volatility.
Notably, this downturn cannot be explained solely by concerns over US interest rates or economic growth. Instead, it appears that both markets are being dragged down as high expectations for AI and semiconductor stocks—which driven this year’s rally—begin to shake.
The following is a comprehensive summary of relevant news and market data, based on the closing figures of the South Korean market on July 8, 2026, and the US market on July 7, 2026.
Nasdaq Drops 1.16%, Led by a Semiconductor Sell-off
On July 7, the Nasdaq Composite Index closed at 25,818.69, down 1.16% from the previous trading day.
On the same day, the S&P 500 slipped 0.45%, and the Dow Jones Industrial Average fell 0.25%. The bleeding was most severe in the Philadelphia Semiconductor Index (SOX), which plummeted 4.65%, leading the tech-heavy Nasdaq's decline.
Among major semiconductor stocks, Micron fell 4.7%, and SanDisk dropped 7.3%.
The core issue behind this decline is not that the growth potential of the AI industry has vanished. Rather, it stems from growing anxieties that market expectations regarding AI data centers and semiconductor capital expenditures (CapEx) have ballooned to unsustainable levels.
As a result, even when companies report stellar earnings, they struggle to satisfy these hyper-inflated expectations. Consequently, earnings announcements are increasingly being triggered as profit-taking events.
Samsung Electronics Falls Despite Beating Earnings Expectations
A prime example illustrating this market volatility is Samsung Electronics.
Despite reporting second-quarter earnings that beat market consensus, Samsung's stock price suffered a sharp decline. This is because both US and Korean investors have shifted their focus away from past performance; they are now questioning whether memory chip prices can maintain their upward momentum and whether the AI semiconductor cycle is nearing its peak.
This sentiment rippled back to the US stock market, where caution over the entire semiconductor sector intensified following Samsung's earnings release. Wall Street is increasingly questioning how much of the massive investment in AI data centers will actually translate into tangible bottom-line profits, and whether the current scale of investment is sustainable.
KOSPI Plunges 5.35% to Close at 7,246.79
The damage was far more pronounced in the South Korean stock market on July 8.
The KOSPI closed at 7,246.79, cratering by 409.52 points or 5.35%. The tech-heavy KOSDAQ also ended the day 5.56% lower at 785.00.
In the KOSPI market, declining stocks (763) overwhelmingly outnumbered advancing ones (124), indicating a market-wide rout rather than a correction limited to a few semiconductor names. The rapid intraday crash even triggered a "sidecar" (a temporary restriction on program trading) to cool down the market.
Market heavyweights Samsung Electronics and SK Hynix dragged the index down significantly, falling by approximately 6.3% and 5.7%, respectively.
KOSPI Enters Technical Bear Market, Down Over 20% From June Peak
The KOSPI has now fallen more than 20% from its record closing high of 9,114.55 recorded on June 22.
In technical terms, a decline of 20% or more from a recent peak signifies that an index has entered a bear market. However, entering a technical bear market does not automatically guarantee a prolonged economic recession or immediate further crashes.
Given how sharply the South Korean market and tech stocks rallied in a short period earlier this year, the recent rout can also be interpreted as a wave of profit-taking and institutional portfolio rebalancing.
While foreign investors snapped up a net total of approximately 335.9 billion KRW on the KOSPI on July 8, they had been on a 13-day consecutive selling streak prior to that day. Although today's crash cannot be blamed entirely on foreign selling, their recent profit-taking has undoubtedly amplified market volatility.
Why the South Korean Market Suffered a Deeper Hit
While both the Nasdaq and the KOSPI were battered by the semiconductor correction, the internal dynamics of the two markets differ fundamentally.
In the US, despite the S&P 500 closing lower, advancing stocks actually outnumbered declining ones. This suggests that the broader US market is not collapsing; rather, the index was dragged down by its heavily weighted mega-cap semiconductor and tech giants.
Conversely, the South Korean stock market is structurally vulnerable because a few mega-caps, such as Samsung Electronics and SK Hynix, command a disproportionately massive share of the KOSPI's total market capitalization. When these semiconductor giants fluctuate, the entire index inevitably experiences amplified volatility.
The South Korean government also noted that the high concentration of market value in the semiconductor sector has heightened the impact of specific stock movements on the broader financial market.
Single-Stock Leverage ETFs Amplify Volatility
Recently launched single-stock leveraged ETFs tracking Samsung Electronics and SK Hynix are also being pointed out as catalysts for market volatility.
Leveraged ETFs are designed to track double the daily return of their underlying assets. While they maximize gains during a bull market, they also compound losses and trigger aggressive selling pressure during a downturn.
The Bank of Korea (BOK) warned that single-stock leveraged ETFs deepen herd behavior toward specific companies. When trading volume concentrates heavily in one direction, it severely exacerbates market volatility. Financial regulatory authorities are currently monitoring the systemic impact of these products.
Recent reports indicate that over 3 trillion KRW has flooded into 2x leveraged ETFs tied to Samsung Electronics and SK Hynix in just the past week.
Interest Rates and Crude Oil Add Further Pressure
While semiconductors and the AI sector remain the primary market drivers, macroeconomic factors like interest rates and crude oil prices are adding a layer of strain.
In the US, the market is closely watching tech firms increasing debt issuance and borrowing to fund their aggressive AI capital expenditures. Simultaneously, anxiety lingers over the Federal Reserve's potential interest rate trajectory.
Just recently, on June 23, a combination of anxieties over AI investment burdens and a hawkish US monetary policy outlook caused the Nasdaq to slide 2.21% and the Philadelphia Semiconductor Index to plummet 7.9%.
Furthermore, recent reports of attacks on cargo vessels near the Strait of Hormuz have pushed crude oil prices higher, adding to global inflationary and interest rate pressures.
Summary: 5 Key Drivers of the Current Market Downturn
The current downturn in the Nasdaq and South Korean markets can be boiled down to five core factors:
Valuation Fatigue: AI and semiconductor stocks rallied too fast in a short period, leading to high valuation burdens.
The "Good is Not Enough" Syndrome: Solid earnings are no longer sufficient to satisfy the hyper-inflated expectations of investors.
Sustainability Questions: Skepticism is growing over whether demand for semiconductors and AI data center expansion can maintain this blistering pace.
Structural Vulnerability: The KOSPI’s heavy reliance on a few semiconductor mega-caps, combined with the rise of single-stock leveraged ETFs, has made South Korea far more volatile than the US.
Macro Headwinds: External variables, including US interest rates, rising crude oil prices, and geopolitical tensions in the Middle East, are dampening investor sentiment.
Key Indicators to Watch Moving Forward
Going forward, the market will likely focus on fundamental indicators rather than chasing short-term technical rebounds. Investors should closely monitor:
The Federal Reserve's future interest rate policy direction.
AI tech giants' capital expenditure plans and financing scales.
The sustainability of memory semiconductor price hikes.
Second-half earnings guidance for Samsung Electronics and SK Hynix.
In particular, Samsung Electronics' earnings call scheduled for July 30 will be a crucial turning point, as its commentary on memory supply-demand dynamics and long-term contracts will heavily influence global semiconductor sentiment.
Ultimately, the current correction is widely viewed not as the end of the AI growth story, but rather as a healthy digestion period where the market reprices the valuations and actual earnings of rapidly inflated AI and tech stocks.
However, because the South Korean stock market remains structurally tied to its semiconductor giants, it will likely remain highly sensitive to the movements of the US Nasdaq and the Philadelphia Semiconductor Index for the foreseeable future.
Nasdaq, KOSPI, USStockMarket, KoreanStockMarket, MarketCorrection
댓글
댓글 쓰기