Nasdaq Rises 0.90%, KOSPI Surges 6.24%: Cooling US Inflation and Semiconductor Rebound Drive the Markets

 Both the US Nasdaq and South Korea’s KOSPI recorded strong gains.

On July 14, US markets rebounded, led by tech stocks, thanks to cooler-than-expected inflation data and strong earnings from major Wall Street banks. Riding on this positive momentum and a massive wave of foreign net buying, South Korea's KOSPI surged over 8% intraday on July 15. Although it pared some gains in the afternoon due to profit-taking, it still closed with a stellar 6.24% gain.

Given the extreme swings of sharp drops and rapid surges over the past few days, it is too early to say the market has fully stabilized. Instead, it is more accurate to view this as a strong rebound in investor sentiment, centered heavily around semiconductor stocks.

Nasdaq Up 0.90% to Close at 26,107.01

On July 14, the Nasdaq Composite Index rose 233.83 points, or 0.90%, to close at 26,107.01.

• The S&P 500 climbed 28.25 points, or 0.38%, to 7,543.59.

• The Dow Jones Industrial Average gained 9.63 points, closing flat-to-positive at 52,508.27.

The Nasdaq led the gains as Treasury yields fell following the cooling US inflation data, prompting a wave of buying in semiconductor and AI-related tech stocks.

1. Cooling US Inflation: The Catalyst for Tech Rebound

The most direct catalyst for the Wall Street rally was the June Consumer Price Index (CPI) report.

• June CPI fell 0.4% month-over-month and rose 3.5% year-over-year—down significantly from May's 4.2% YoY increase.

• Core CPI (excluding food and energy) remained flat compared to the previous month and rose 2.6% year-over-year. Declining international oil and gasoline prices played a major role in easing overall inflation.

With inflation cooling, expectations grew that the Federal Reserve would hold interest rates steady. According to market pricing, the implied probability of a July rate hike plummeted from about 35% before the CPI release to just 10% afterward.

Lower interest rates ease the valuation burden on high-growth tech stocks, whose values are highly sensitive to the discounted value of future earnings.

2. Strong Wall Street Bank Earnings and Chip Optimism

A strong start to the Q2 earnings season also buoyed the market:

• Goldman Sachs jumped 9% after beating Wall Street estimates, driven by heightened market volatility and a recovery in investment banking fees.

• In the semiconductor sector, Dutch chip equipment giant ASML beat market expectations and raised its sales outlook, easing worries about a global chip demand slowdown.

However, it wasn't a universal rally. IBM plummeted about 25% in a single day due to concerns over its earnings and business outlook. This highlights a growing divergence within AI-related stocks, where actual performance is beginning to separate winners from losers.

KOSPI Surges 6.24% to Close at 7,284.41

On July 15, South Korea's benchmark KOSPI skyrocketed 427.58 points, or 6.24%, to finish at 7,284.41.

The index opened 3.30% higher at 7,082.91 and continued to soar, reaching an intraday high of 7,424.18 (up 8.27%). However, profit-taking in the afternoon pulled the final closing gain to 6.24%.

Meanwhile, the tech-heavy KOSDAQ also surged 45.45 points, or 5.80%, to close at 829.43.

1. Mass Program Buying Triggers "Sidecars"

The rapid morning surge triggered program-buying "sidecars" in both the KOSPI and KOSDAQ markets shortly after the opening bell.

A "sidecar" is a temporary five-minute halt on program-buying orders, triggered when futures prices rise above a certain threshold for more than a minute, preventing market overheating.

2. Foreign Investors Lead the Charge

• Foreign Investors: Net bought approximately 2.32 trillion KRW (their largest single-day net purchase since May 6).

• Institutional Investors: Net bought around 180 billion KRW.

• Retail Investors: Net sold about 2.47 trillion KRW to lock in profits.

Out of all listed KOSPI stocks, 709 advanced while 169 declined, indicating that the buying momentum was broad-based. While heavy foreign selling had accelerated the market's recent plunge, their massive return on this day fueled the explosive rebound, with capital heavily concentrated in Samsung Electronics and SK Hynix.

3. Semiconductor Giants Drive the Index

• Samsung Electronics jumped 6.27% to close at 279,500 KRW.

• SK Hynix surged 8.83% to close at 2,082,000 KRW, reclaiming the psychologically important 2 million KRW mark.

Foreigners heavily accumulated both, net-buying 650 billion KRW of SK Hynix and 510 billion KRW of Samsung Electronics, making them the top two most-bought stocks of the day. Because these two heavyweights command a massive share of the KOSPI's total market cap, their simultaneous surge disproportionately boosts the entire index.

Why Did the KOSPI Spike over 8% Intraday?

• Cooling US CPI: Relieved fears of further Fed rate hikes, lowering US Treasury yields and boosting Korean tech sentiment.

• Global Semiconductor Rebound: ASML’s blowout earnings and outlook eased fears of a sudden semiconductor demand cliff.

• Massive Foreign Inflows: Foreigners net buying over 2 trillion KRW of local shares accelerated the KOSPI's upward momentum.

• Dip Buying After a Steep Correction: Prior to the rebound, the KOSPI had corrected nearly 25% from its late-June peak. This rapid decline attracted heavy value-hunting in beaten-down chip stocks.

Why It Failed to Hold Its Intraday Highs

Despite reaching an intraday high of 7,424.18, the KOSPI pulled back to close at 7,284.41. Once the index spiked over 8%, retail investors aggressively sold off (about 2.47 trillion KRW in net sales) to lock in short-term gains, dragging the index down slightly.

Furthermore, the KOSPI's intraday volatility has worsened recently due to high concentration in chip stocks and the expansion of leveraged trading products. With Samsung and SK Hynix making up more than half of the KOSPI's total market cap, any minor shift in their prices whipsaws the entire index.

Nasdaq vs. KOSPI: Key Differences

While both markets rallied on the exact same macro news—cooling US inflation and chip sector recovery—there is a stark difference in how they reacted:

• The US market is highly diversified across tech, banking, energy, and healthcare. Even if tech stocks fluctuate wildly, other sectors can cushion the blow, resulting in a more moderated 0.90% Nasdaq gain.

• The KOSPI is extremely concentrated around Samsung Electronics and SK Hynix. When global chip sentiment turns positive, these two stocks explode upward, dragging the entire Korean index with them—explaining why KOSPI's closing gain (6.24%) was much larger than Nasdaq's.

Risk Factors to Watch

While the rebound is encouraging, several risks remain on the horizon:

• Crude Oil & Geopolitical Tensions: Brent crude has climbed back to the $85 range amid renewed tensions between the US and Iran. A prolonged escalation in energy prices could reignite inflation and rate-hike anxieties.

• The "AI Peak" Debate: Despite the rebound, debates persist over whether AI and memory chip demand will face oversupply or slowing export price growth in the medium term.

• Extreme Market Volatility: With the KOSPI swinging 5% to 9% daily in recent sessions, it is too early to say the market has entered a stable recovery phase.

Key Metrics to Watch Moving Forward

1. US PPI and Inflation Trends: While June CPI cooled, rising crude oil prices mean future inflation data must be closely monitored.

2. Fed Interest Rate Decisions: Market participants will scrutinize upcoming Fed meetings and speeches to confirm whether a rate-hike pause is truly locked in.

3. US Big Tech Q2 Earnings & CAPEX: Real-world spending on AI data centers and chips will directly dictate the earnings outlook for Samsung and SK Hynix.

4. Foreign Capital Flows: Since foreign buying of over 2 trillion KRW drove this rebound, their continued participation will be the ultimate test of the KOSPI's recovery.

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