Nasdaq Edges Up, KOSPI Rebounds 2.52% as Semiconductor Sentiment Revives

 Both the US Nasdaq and South Korea’s KOSPI rebounded on July 10, bringing some relief to investors.

Recently, global markets have experienced intense volatility due to fears of an AI bubble and debates over whether the semiconductor cycle has peaked. However, a recovery in US chip stocks and SK hynix’s high-profile US market debut helped restore investor confidence.

That said, while the KOSPI surged over 2% in a single day, it still suffered a massive loss on a weekly basis. Rather than signaling full market stabilization, this move is best understood as a sharp, tech-driven technical rebound following a steep sell-off.

US Markets Quietly Higher: Nasdaq Up 0.29% to Close at 26,281.61

On July 10, the tech-heavy Nasdaq Composite ticked up 74.72 points, or 0.29%, to finish at 26,281.61.

The broader S&P 500 rose 0.42% to 7,575.39, while the Dow Jones Industrial Average gained 0.29% to close at 52,637.01. For the week, the Nasdaq and S&P 500 managed gains of 1.7% and 1.2%, respectively, whereas the Dow slipped 0.5%.

While US indices didn't skyrocket, the underlying appetite for AI and semiconductor plays remained resilient enough to keep the major benchmarks in positive territory.

SK hynix's US Debut Reinvigorates Tech Sentiment

One of the biggest stories of the day in New York was South Korea's SK hynix.

The memory chip giant listed its American Depositary Receipts (ADRs) on the US market, enjoying a powerful rally in its trading debut. The strong performance reflects Wall Street's booming appetite for High Bandwidth Memory (HBM) and next-gen hardware critical to powering AI data centers.

SK hynix raised approximately $26 billion through this US share offering, making it one of the largest US market debuts by a foreign company in recent history. Amid growing anxieties that tech infrastructure spending might be overheating, the blockbusting success of SK hynix’s debut proves that institutional demand for premium AI memory remains red-hot.

Why the Nasdaq's Gains Were Capped

Despite the strength in chip stocks, the Nasdaq’s gains were capped at 0.29%. Investors largely moved into wait-and-see mode ahead of the Q2 corporate earnings season kicking off next week.

Major bellwethers—including Wall Street giants JPMorgan Chase and Goldman Sachs, alongside chip manufacturing titan TSMC—are set to report. According to LSEG data, S&P 500 companies are projected to post a robust 23.4% year-over-year increase in Q2 net profits. Because expectations are already sky-high, the market’s next move will depend entirely on how significantly these companies can beat consensus estimates.

KOSPI Roars Back 2.52% to Close at 7,475.94

In Seoul, the KOSPI skyrocketed 184.03 points, or 2.52%, to close at 7,475.94. The tech-heavy KOSDAQ index performed even better, jaw-droppingly surging 54.47 points, or 5.47%, to finish at 837.43.

The KOSPI opened strong at 7,552.49 and intra-day surged as high as 7,704.93. This explosive 5%+ intraday rally even triggered a "Buy Sidecar" (trading halt) in the KOSPI 200 futures market to cool down the momentum.

Market breadth was overwhelmingly positive, with roughly 88% of all listed KOSPI stocks closing in the green.

💡 What is a Sidecar?
A regulatory mechanism that temporarily suspends program trading when futures prices fluctuate violently, preventing extreme market volatility.

Chip Heavyweights Drive Seoul's Rebound

The primary catalyst for the KOSPI's rally was the overnight strength of US big tech.

Samsung Electronics jumped 2.52%, and major large-caps across financial, biotech, and automotive sectors followed suit. Interestingly, SK hynix’s domestic shares bucked the trend, closing 0.27% lower after an intra-day rally. Analysts suggest that much of the optimism surrounding its US listing had already been priced in, prompting domestic investors to lock in profits.

In terms of market liquidity, institutional investors led the charge with a net purchase of approximately ₩582.5 billion. Conversely, foreign investors net sold ₩160.1 billion, and retail investors net sold ₩424.6 billion.

Corporate Tech Spending Alleviates "AI Peak" Fears

The sudden revival in semiconductor sentiment was heavily supported by massive, long-term capital expenditure plans announced by top-tier US tech firms:

• Micron Technology committed to investing over $250 billion by 2035 in US semiconductor manufacturing and supply chain infrastructure.

• Meta announced plans to aggressively scale up its AI computing capacity and push forward with its proprietary custom AI chip designs.

These announcements directly pushed back against fears that the AI data center build-out and memory demand were about to fall off a cliff. However, the ultimate test remains whether these massive capital investments will translate into tangible top- and bottom-line growth in upcoming earnings reports.

Despite the Daily Surge, KOSPI Suffers a 7.6% Weekly Drop

While July 10 was a banner day for Korean equities, the broader weekly picture remains grim.

The KOSPI plummeted from 8,088.34 on July 3 to close at 7,475.94 on July 10—representing a 7.6% weekly drop. The index cratered 4.9% on July 7 and another 5.35% on July 8, pushing it down more than 20% from its recent peak.

During that mid-week rout, tech giants like Samsung Electronics and SK hynix took a massive beating as anxieties spiked regarding the sustainability of AI capital expenditure and future memory chip pricing. Therefore, Friday's 2.52% jump is best viewed as a mix of opportunistic buy-the-dip inflows and a temporary relief rally rather than a full structural reversal.

Why the Korean Market Suffers Higher Volatility

While both the Nasdaq and the KOSPI are heavily tethered to the AI and semiconductor themes, the South Korean market suffers from extreme concentration risk.

Because Samsung Electronics and SK hynix command such a massive weight in the KOSPI, the entire index's direction is effectively held hostage by the daily fluctuations of these two stocks.

Korean financial authorities have openly warned that this extreme sector concentration—compounded by the rising popularity of single-stock leveraged ETFs—is amplifying market swings. When these heavyweights move, leveraged products force accelerated buying or selling in the same direction, turning minor market ripples into massive waves.

Looking Ahead: 4 Key Catalysts for Next Week

To gauge whether this tech rally has legs, global investors should closely monitor four critical variables next week:

1. TSMC’s Q2 Earnings (July 16)

As the exclusive manufacturer for Nvidia, Apple, AMD, and Broadcom, TSMC is the ultimate barometer for global AI hardware demand. Wall Street will be laser-focused on whether the foundry giant raises its full-year revenue guidance and capital expenditure targets.

2. US Consumer Price Index (July 14)

The June US CPI print will be a major market mover. A hotter-than-expected inflation reading could revive fears of sticky inflation and hawkish Federal Reserve commentary, pushing Treasury yields higher. Conversely, cooling inflation will provide breathing room for high-growth tech stocks.

3. Oil Prices and Middle East Tensions

Geopolitical friction between the US and Iran has left crude prices highly volatile. Any potential disruptions to shipping lanes in the Strait of Hormuz could spark an energy shock, reigniting inflationary pressures and weighing heavily on global equities.

4. Stabilization of Samsung and SK hynix

For the KOSPI to sustain its recovery, its two tech pillars must find a floor. Investors will also need to watch for any valuation arbitrage or shifting dynamics between SK hynix's domestic shares in Seoul and its newly minted ADRs in New York.

The Bottom Line

On July 10, the Nasdaq edged up 0.29% to 26,281.61, while the KOSPI surged 2.52% to 7,475.94, driven by a broad-based relief rally in the AI and semiconductor ecosystem.

However, with the Nasdaq reining in gains ahead of corporate earnings and the KOSPI still nursing a painful 7.6% weekly loss, the market is currently caught in a fierce tug-of-war between long-term AI optimism and near-term cyclical anxieties. Next week’s corporate scorecards and macro data will go a long way in deciding which narrative wins out.