Global Stock Market Trends — 2026-05-27

Global Indices at a Glance

Based on local closing prices or latest available data on May 26. KOSPI is intraday as of 1:46 PM. FTSE 100 closed for a public holiday.

🇰🇷 South Korea Market

KOSPI / KOSDAQ Overview

The KOSPI showed strong momentum, breaking through the 8,100-point line during the session on May 26. As of 1:46 PM, it was up 232.46 points (+2.96%) to 8,080.17, having hit an all-time high of 8,094.90 earlier in the day. The primary driver was optimism surrounding US-Iran peace negotiations. The KOSDAQ also rose 3.33% to 1,199.76, nearly reclaiming the 1,200 level. Daily trading volume surged, with the KOSPI average daily trading value hitting 48 trillion won, surpassing 40 trillion won for the first time in history.

Flow Trends

• Foreigners: Turned to net buying — Ended a 12-day selling streak; exited selling positions in Samsung Electronics and SK Hynix.
• Institutions: Net buying in KOSDAQ.
• Individuals: Data not yet confirmed.

Today's Leading Sectors & Stocks

• Samsung Electronics (005930): Strong — Led KOSPI gains on Iran peace optimism and improved semiconductor cycle outlook. Big jump from previous close (referred to as "300,000 Electronics").
• SK Hynix (000660): Strong — Boosted by global AI infrastructure demand and the "spillover" effect from Micron Technology’s US rally. Skyrocketed to levels dubbed "2 million Hynix."
• EcoPro BM / EcoPro: Led KOSDAQ early-session gains among market cap leaders, with both foreign and institutional net buying.

🇺🇸 US Market

Major Indices (As of the latest close on May 27)

The S&P 500 and Nasdaq Composite both hit record highs intraday and at the close on May 26 (the day after Memorial Day). Micron Technology (MU) triggered a rally in the chip sector, fueling technology stocks. In contrast, the Dow Jones saw a slight decline, reflecting a heavy concentration in large-cap tech. Brent crude futures closed around $100 per barrel amidst US-Iran peace hopes, supporting the energy sector. The market saw strong risk-on buying on the first day of trading following the May 25 Memorial Day closure.

Key Movements

• Micron Technology (MU): Surged — Led the chip sector rally on earnings expectations and AI memory demand optimism.
• S&P 500: Record closing high — Driven by AI and semiconductor gains after the holiday.
• Nasdaq Composite: Record closing high — Broad gains in large-cap tech.

Sector Trends

Semiconductor and AI infrastructure tech stocks emerged as the clear leaders, while the energy sector remained firm due to rising oil prices. Traditional manufacturing and financial stocks lagged, as seen in the Dow’s slight dip, highlighting a tech-heavy market.

🌏 Asia & Europe Markets

Asia (Japan, China, Hong Kong)

Japan’s Nikkei 225 closed down 0.25% at 64,996.09 on May 26. Analysts attribute this to profit-taking after the index hit the 65,000 mark for the first time in history during the Asian trading session on May 25. The Hong Kong Hang Seng index remained flat, while Asian markets generally showed mixed results despite the optimism over US-Iran peace talks.

Europe (UK, Germany, France)

The UK FTSE 100 was closed for a public holiday on May 25. Major European indices rose to their highest levels since March 2, fueled by progress in US-Iran truce talks. Eurozone bond yields fell on peace hopes, and the DAX continued its upward trend.

📊 Market Drivers

• US-Iran Truce Hopes: Market sentiment was dominated by hopes for a peace deal, even as the US continued defensive operations against Iranian ships. Oil prices stabilized near $100/barrel, supporting the energy sector and global risk-on rallies.
• Micron-led Semiconductor Rally: Micron’s stock surge amplified optimism for the AI memory and semiconductor cycle, impacting not only the US Nasdaq but also driving SK Hynix and Samsung Electronics in Korea.
• Foreign Buying Shift (Korea): After 12 straight days of net selling in Samsung and SK Hynix, foreign investors turned to net buyers on May 26. Interestingly, they had spent the previous week rebalancing portfolios into robotics, ESS, and AI infrastructure (e.g., Doosan Robotics).
• US Post-Memorial Day Rebound: The S&P 500 and Nasdaq set new records on the first trading day after the holiday, confirming strong momentum. As of May 21, the US market had been on an 8-week winning streak.

🔭 Points to Watch

Key Events This Week

• US-Iran Negotiation Progress: Immediate impact on oil and global markets; watch for volatility in energy and defense.
• US PCE Inflation Data: Crucial for Federal Reserve interest rate path decisions.
• Foreign Buying Sustainability (Korea): Need to determine if the turn to net buying is a trend reversal or a one-off event.
• KOSPI 8,100 Consolidation: Can the market maintain this level at the close, or will profit-taking prevail?
• AI Semiconductor Earnings: Keep an eye on further earnings reports and updates to AI demand forecasts following Micron.

Investor Checklist

• Monitor geopolitical news regarding Iran for potential oil price spikes.
• Watch foreign buying trends: A rotation into robotics, ESS, and AI infrastructure could widen the performance gap between stocks.
• Check for potential technical adjustments in the US Nasdaq after reaching record highs.

💬 One-Line Insight

The convergence of US-Iran peace hopes and AI semiconductor optimism pushed markets to new highs, but without a fundamental resolution of geopolitical risks, volatility could reignite at any time—making risk management essential even in a bull market.