KOSPI Market Briefing — May 30, 2026

Daily Index Status

The KOSPI hit a historic high on the 29th, surging 3.55%. Despite the fact that 82.34% of the 2,764 listed stocks have fallen over the past month, the index reached this record peak because capital has been heavily concentrated in AI-related heavyweights like Samsung Electronics and SK Hynix. Market polarization is clearly intensifying.

Trading Trends by Investor Type

• Foreigners: Continued long-term net selling. They have offloaded 49.85 trillion won over the last 15 trading days, continuing to pressure prices alongside institutional investors. However, the heavy buying from individuals has prevented a slide.
• Institutions: Acting as a buffer alongside individual investors, helping to support the market with spot buying.
• Individuals: Actively buying. They have particularly propped up the market floor by executing 3.6 trillion won in buy orders at the 8,100 support level.

Top Movers

Top 3 Gainers

Samsung Electronics (005930) — Rose on news of the world's first 3nm process mass production, strengthening its position as an AI memory chip leader. It climbed over 22% this month, outperforming all top 10 S&P 500 stocks.

SK Hynix (000660) — Gained in tandem, fueled by rising demand for high-bandwidth memory (HBM) for AI data centers and positive outlooks on semiconductor profitability.

Naver (035420) — Rose on expectations for AI technology investment and cloud business expansion, though gains were limited compared to large-cap semiconductor stocks.

Top 3 Decliners

Mid-to-Small Manufacturers — Widespread decline across 82% of the market, particularly in non-AI sectors like electrical/electronic components, chemicals, and auto parts.

Finance/Services — Remained weak due to concerns over interest rate hikes and economic slowdown.

Energy/Materials — Slumped due to sluggish global demand.

Sector Trends

Strong Sectors: Semiconductors/Electronic Components (+5%+) — Led by Samsung and SK Hynix on AI demand and memory cycle recovery. IT (+2~3%) — Active in cloud and AI platform-related stocks.

Weak Sectors: Non-IT Manufacturing (–12%) — Broad-based adjustment in auto parts, chemicals, and construction. Finance (–0.51%) — Impacted by rate hike scenarios and economic gloom.

Key Issues

1. KOSPI tops 8,400 — The paradox of 82% of stocks falling

• Details: The KOSPI surged 22.2% in May to break the 8,400 mark, yet 82.34% of listed stocks declined. This signals extreme capital concentration.
• Impact: Increased market polarization is raising psychological risk for retail investors, though individual buying continues to push the index higher.

2. 15 consecutive days of foreign net selling (49.85 trillion won)

• Details: Foreigners have net sold for 15 straight sessions, totaling 49.85 trillion won, driven by geopolitical risks involving Iran and global rate hike fears.
• Impact: Individual investors (41.88 trillion won in net buying) are holding the line. The timing of foreign re-entry remains the key variable.

3. US-Iran peace talks underway — Signs of easing geopolitical tension

• Details: Negotiations are in the final stages, which is helping to ease concerns over oil price spikes and the weakness of global risk assets.
• Impact: Progress in talks could lead to stable oil prices, lower expectations for rapid rate hikes, and increased inflows into emerging markets.

Macro & External Variables

KRW/USD Exchange Rate: Stable between 1,200 and 1,210. The weakening yen and reduced uncertainty regarding US rates are keeping the won relatively strong.

US 10-Year Treasury Yield: Stabilized around 4.3% as global rate hike fears moderated.

Oil (WTI): Trending toward stability between $75-$80 per barrel due to the Iran peace talks.

FOMC Policy Expectations: The market has largely priced in an additional hike in June, with focus shifting to potential policy changes after July.

Chinese Economic Indicators: Continued weakness in the May manufacturing PMI signals sluggish demand from China, raising concerns for semiconductor equipment and material exports.

Tomorrow’s Checkpoints

• Global economic data (China service PMI, US jobless claims)
• Fed official comments and interest rate futures
• Potential official announcement of Iran-US peace talks
• Samsung Electronics product announcements and corporate disclosures

Investor Guidelines

• Short-term: Exercise caution in an environment where 82% of stocks are falling. Monitor for potential technical corrections in large-cap semiconductor stocks.
• Mid-to-Long-term: Current polarization is a natural stage in AI monetization. Watch for earnings improvement indicators in non-AI firms.
• Risks: (1) Liquidity shortages if foreign selling continues, (2) acceleration of global rate hikes, (3) semiconductor demand warnings due to China's slowdown.

Expert Comment

"The Korean stock market remains undervalued relative to historical valuations. With a 1-year forward P/E of around 9x, it remains attractive compared to the long-term average." — Seo Sang-young, Analyst at Mirae Asset Securities.

The current record high for the KOSPI is not the peak of the AI rise cycle, but a stage in its progression. Supported by strong individual buying and government support for AI and semiconductors, there is significant room for further growth if foreign investors return.