Domestic Stock Market Briefing — 2026-05-06

Today's Index Status

Note: For exact closing figures based on Yahoo Finance, please check the original source page directly.

On May 6, 2026, the KOSPI broke through the 7,000-point mark for the first time at the opening of the market. As of 10:48 AM, it was trading above 7,300, with Samsung Electronics and SK Hynix leading the charge by surging over 10% each. Unlike the KOSPI rally, the KOSDAQ struggled under selling pressure from institutions and foreigners, causing most of the top 10 stocks by market cap to fall, with the exception of EcoPro and EcoPro BM. While individual investors net bought 186.1 billion KRW in the KOSDAQ, foreign and institutional selling of 104.1 billion KRW and 55.6 billion KRW respectively capped the gains.

Market Flow by Investor Type

• Foreigners: Recorded 1.68 trillion KRW in net buying in the KOSPI market during the session (based on morning figures), focusing heavily on Samsung Electronics and SK Hynix. Continued their multi-day net buying streak in both spot and futures markets.
• Institutions: Net sold 55.6 billion KRW in the KOSDAQ market. Remained passive or absent from buying KOSPI large-caps.
• Individuals: Attempted bottom-fishing by net buying 186.1 billion KRW in the KOSDAQ, while profit-taking in the KOSPI.

Today's Top Stocks

Top 3 Gainers

Samsung Electronics (005930) — Up +10% during session, reaching historic highs Driven by AI semiconductor investment themes and massive foreign net buying, Samsung Electronics surged over 10% during the session. According to Reuters, the company is now within reach of joining the 1 trillion USD (1,000 trillion KRW) market cap club. Expectations for HBM and foundry demand following increased global AI infrastructure investment have been reflected.

SK Hynix (000660) — Up +10% during session, market cap surpasses 1 quadrillion KRW SK Hynix soared over 10% intraday, pushing its market capitalization past 1 quadrillion KRW (1,000 trillion KRW). The stock saw concentrated buying from foreigners and institutions amid steady growth in HBM demand for AI data centers. Having hit a record high on May 4, it broke the record for two consecutive days.

EcoPro (086520) — Maintaining gains among KOSDAQ top market cap stocks While the broader KOSDAQ was weak, EcoPro and EcoPro BM were exceptions, maintaining upward momentum among the top 10 stocks. This appears to be a technical rebound for the secondary battery materials sector, supported by individual investor buying.

Top 3 Decliners

Majority of KOSDAQ top market cap stocks — Simultaneous foreign/institutional selling Except for EcoPro and EcoPro BM, most of the top 10 KOSDAQ stocks fell. Foreigners net sold 104.1 billion KRW and institutions net sold 55.6 billion KRW in the KOSDAQ, dampening the index's rise. Analysts point to a "straw effect" where capital is being pulled into large-cap semiconductor stocks in the KOSPI.

Kakao·Naver (Platform affiliates) — Relative weakness within KOSPI Platform and internet sectors showed relative weakness compared to semiconductor/AI hardware. The shift of capital toward semiconductors was distinct due to foreign buying. Note: specific decline rates are intraday; final closing figures should be verified.

KOSDAQ Small/Mid-cap Biotech — Weakened investor sentiment Biotech stocks in the KOSDAQ faced selling pressure amid capital concentration in KOSPI large-cap semiconductors. The Korea Herald reported on May 5 that the IPO market remains in a slump despite the KOSPI rally.

Industry & Sector Trends

Bullish Sectors:

• Semiconductors/AI Hardware: The core engine of the KOSPI rally. Samsung Electronics and SK Hynix surged over 10% each, driving the entire index. Expectation of increased global AI infrastructure investment and concentrated foreign buying have led to upward adjustments in Q2 earnings forecasts.

• Secondary Batteries (Some KOSDAQ): Despite the general KOSDAQ weakness, EcoPro and EcoPro BM maintained gains backed by individual buying.

Bearish Sectors:

• KOSDAQ Overall (Biotech/IT Small-caps): Most top market cap stocks in KOSDAQ fell. Individual buying was insufficient against combined foreign and institutional selling.

• Platforms/Internet: Relatively neglected as capital shifted toward the semiconductor sector.

Key Issues & Drivers (3-5)

1. KOSPI surpasses 7,000 for the first time — A triumph for the AI semiconductor rally

• Summary: On May 6, 2026, the KOSPI index broke through 7,000 for the first time and reached 7,300 intraday. The direct cause was massive net buying of 1.68 trillion KRW by foreigners, with Samsung Electronics and SK Hynix leading the way.
• Market Impact: Strengthening of KOSPI and semiconductor/IT hardware sectors; polarization with KOSDAQ deepens; Samsung Electronics nearing the 1 trillion USD market cap club.

1 sources

ebc.com

ebc.com

2. SK Hynix market cap hits 1 quadrillion KRW (1,000 trillion KRW)

• Summary: SK Hynix achieved an unprecedented record in the history of the Korean stock market by surpassing a market cap of 1 quadrillion KRW. It broke the all-time high record for two consecutive days.
• Market Impact: SK Hynix’s strength is a key contributor to the KOSPI index rise, triggering a revaluation of the entire HBM/AI semiconductor sector.

3. "Sell in May" myth debunked — Record highs continue in May

• Summary: The adage "Sell in May and go away" is not applying to the Korean market in 2026. After hitting 6,936.99 on May 4, the KOSPI broke the 7,000 mark on May 6.
• Market Impact: Consecutive record highs in May are stimulating chase-buying sentiment, though concerns about overheating and bubbles are emerging.

1 sources

koreajoongangdaily.joins.com

koreajoongangdaily.joins.com

4. Korean stock market cap exceeds 6,000 trillion KRW — Over 400 companies in the "1 trillion club"

• Summary: The total market capitalization of the Korean stock market reached 6,000 trillion KRW, and the number of companies with a market cap of over 1 trillion KRW surpassed 400 for the first time, as reported by Seoul Economic Daily on May 3.
• Market Impact: Elevation of Korea's global financial status; market growth now surpassing the UK stock market.

5. IPO market remains in a slump — Disconnected from the KOSPI rally

• Summary: Even as the KOSPI continues to hit new highs, the IPO market remains stuck in a slump. The number of new listings has decreased significantly year-on-year, and investors are showing a "polarization effect," focusing on large semiconductor stocks rather than new listings.
• Market Impact: Weakened investor sentiment for new KOSDAQ listings and small-cap stocks; deepening KOSPI-KOSDAQ polarization.

Macro & External Variables

KRW/USD Exchange Rate: As foreigners aggressively buy KRW-denominated assets, there is upward pressure for a stronger Won. Increased net buying by foreigners serves as a short-term factor for Won appreciation. Please verify specific figures with the Bank of Korea or Seoul Foreign Exchange Market closing data.

US Market & AI Theme: US big tech’s announcements of expanded AI investment are fueling expectations for the Korean semiconductor supply chain. The KOSPI has surged nearly 60% this year, recording the highest return among major global indices.

Semiconductor Cycle: Demand for AI semiconductors, centered on HBM (High Bandwidth Memory), is offsetting short-term correction fears. The record milestones of SK Hynix and Samsung Electronics reflect expectations for a cycle shift.

Bubble Concerns: Bloomberg released an analysis on April 28 suggesting that Korea's world-leading surge is creating bubble risks. The report warns that as the gap between valuation and fundamentals widens, so does the risk of a correction.

Tomorrow's Checkpoints

• KOSPI sustaining 7,300: Need to confirm if the index can maintain levels above 7,300 by the closing bell. The sustainability of foreign net buying is key.
• Samsung/SK Hynix movement: Given the 10% jump, watch for profit-taking in the next session and monitor changes in foreign futures positions.
• KOSDAQ rebound: With deep polarization from the KOSPI, check for potential recovery attempts in oversold biotech and mid-cap IT stocks.
• US FOMC & Employment data: FOMC minutes and employment data will influence global liquidity and decide the continuity of foreign buying.

Investor Guidance

• Short-term: Chasing stocks after a 10%+ daily surge is high-risk. We recommend re-evaluating entry timing after checking the closing price and foreign futures positions. Oversold secondary battery stocks like the EcoPro group may offer short-term trading opportunities.
• Mid-to-long term: If the consensus that we are in the early stages of an AI semiconductor cycle holds, a tiered buying strategy via semiconductor ETFs centered on Samsung Electronics and SK Hynix is valid. However, given the 60% KOSPI surge this year, portfolio weight management is essential.
• Risk Factors: 1) Constant attention to the possibility of a bubble burst as highlighted by Bloomberg. 2) Risks of sharp declines if the KRW/USD rate fluctuates or foreigners exit. 3) Possible concurrent semiconductor correction if AI investment momentum or big tech earnings disappoint.

Expert Comments

Seo Sang-young, Analyst at Mirae Asset Securities: "The Korean stock market remains undervalued by historical valuation standards. It is trading at approximately 9x P/E relative to this year's earnings outlook, leaving room for further upside," noting that the market remains cheaper compared to other major markets based on EPS.

EBC Financial Group Analysis Team: "The KOSPI breakthrough of 7,000 confirms Korea's AI semiconductor-led rally. However, investors should monitor earnings trends, concentration in semiconductors, foreign fund flows, and major risks."

This briefing is based on reports available during the morning session (around 10:48 AM) on May 6, 2026. Please refer to official exchange announcements for final closing and flow data after the market closes.