[2026.05/11~05/15] Korea Stock Market Weekly Review | KOSPI -3.63%, KOSDAQ -6.85% Plunge After Record Highs
📊 This Week at a Glance
The Korean stock market posted a sharp weekly decline after touching all-time highs mid-week. The KOSPI briefly broke above the 8,046 level, but a heavy wave of profit-taking on Friday (May 15) dragged the index down -6.12% in a single session, closing the week at 7,493.18 for a weekly loss of -3.63%. The KOSDAQ underperformed even more sharply, recording a weekly drop of -6.85% to close at 1,129.82.
| Index | Week Open | Week High | Week Low | Week Close | Volume (만 shares) | Weekly Change |
|---|---|---|---|---|---|---|
| KOSPI | 7,775.31 | 8,046.78 | 7,371.68 | 7,493.18 | 422,672.2만 | -3.63% |
| KOSDAQ | 1,212.88 | 1,225.29 | 1,110.16 | 1,129.82 | 605,518.4만 | -6.85% |
📅 Daily Performance
The week opened strongly with KOSPI gaining +4.32% on Monday, followed by a Tuesday pullback and a fresh rally on Wednesday and Thursday that pushed the index above 8,000. However, Friday brought a violent reversal, with the KOSPI and KOSDAQ both plunging on the back of US CPI-related concerns and a sharp depreciation of the Korean won.
| Date | KOSPI Close | KOSPI Change | KOSDAQ Close | KOSDAQ Change |
|---|---|---|---|---|
| Mon, 5/11 | 7,822.24 | +4.32% | 1,207.34 | -0.03% |
| Tue, 5/12 | 7,643.15 | -2.29% | 1,179.29 | -2.32% |
| Wed, 5/13 | 7,844.01 | +2.63% | 1,176.93 | -0.20% |
| Thu, 5/14 | 7,981.41 | +1.75% | 1,191.09 | +1.20% |
| Fri, 5/15 | 7,493.18 | -6.12% | 1,129.82 | -5.14% |
📈 KOSPI Weekly Analysis
The KOSPI opened the week around 7,822 and pushed toward the 8,000 mark on Tuesday and Wednesday, touching a weekly high of 8,046.78. The bullish move was supported by strong sentiment around major Korean tech names and ongoing optimism over the semiconductor cycle. However, Friday's -6.12% collapse erased the week's gains and ended the streak of record highs, with the index closing at 7,493.18 for a weekly loss of -3.63%.
The selloff was driven by a combination of profit-taking pressure near record territory, a surge in the USD/KRW exchange rate to 1,497.76, and renewed concerns over US inflation data. Among large caps, OCI Holdings (-73,500 KRW) and HD Hyundai Energy Solutions (-47,200 KRW) led the solar/renewable energy sector lower. In contrast, Doosan Robotics (+20,600 KRW) and Korea Shell Petroleum (+97,000 KRW) bucked the trend and posted strong weekly gains.
📉 KOSDAQ Weekly Analysis
The KOSDAQ was the weakest of the two benchmarks, falling -6.85% over the week to close at 1,129.82. After opening flat on Monday (-0.03%), the index dropped -2.32% on Tuesday, briefly rebounded +1.20% on Thursday, and finally collapsed -5.14% on Friday, slipping toward the 1,110 level.
Weekly range from a high of 1,225.29 to a low of 1,110.16 highlighted elevated volatility. Selling pressure concentrated in biotech and technology names, including Poled (limit-down -6,000 KRW), ToolGen (-28,800 KRW), and Micro Contact Solution (-9,550 KRW). On the other hand, individual momentum trades remained alive, with SAMT, Samji Electronics, Kespion, and several other small-caps hitting upper price limits during the week.
🔥 Weekly Themes & Sectors
1. Silver Futures Inverse ETNs (Strong)
A sharp drop in silver prices pushed inverse 2X silver futures ETNs from Mirae Asset, Samsung, KB, Meritz, Kiwoom, and Korea Investment to the top of the weekly gainers list. At the same time, leveraged silver futures ETNs fell 15,000–16,500 KRW, illustrating the violent swing in commodity-linked products throughout the week.
2. Robotics & Automation (Strong)
Doosan Robotics (+20,600 KRW), Hanseon Engineering (+4,650 KRW), iRobotics (limit-up), and TPC Global (limit-up) led the robotics and automation theme higher. Continued global investment in industrial automation and supportive policy momentum sustained the differentiated rally.
3. Solar & Renewable Energy (Weak)
Solar and renewable energy large caps including OCI Holdings (-73,500 KRW) and HD Hyundai Energy Solutions (-47,200 KRW) suffered heavy losses. Weak crude oil prices and concentrated profit-taking were the main drags on the segment.
4. Biotech & Healthcare (Weak)
ToolGen (-28,800 KRW), LaMediTech (-1,500 KRW), Aprogen Biologics (-1,090 KRW), and Cell Biohuman Tech (-1,690 KRW) led broad weakness in biotech. Rate uncertainty pressured growth-stock valuations through the week.
5. Small-Cap Momentum Plays
Despite the index's drawdown, more than eight KOSDAQ stocks—including Kespion, Samji Electronics, TPC Global, iRobotics, Satoshi Holdings, NCN, and Solux—hit upper price limits during the week, indicating that individual momentum trades remained very active.
KOSPI Sectors — Weekly Performance
| Sector | Weekly Change |
|---|---|
| Electronic Equipment | +10.24% |
| Diversified Consumer Services | +1.84% |
| Gas Utilities | +1.35% |
| Food & Staples Retail | +1.33% |
| Textiles, Apparel & Luxury Goods | +0.97% |
| Property & Casualty Insurance | +0.68% |
Electronic Equipment dominated with a +10.24% weekly gain, while defensive and staples sectors filled out the top leaders. Capital rotation into defensive names was clearly visible amid the broader index weakness.
💰 Foreign & Institutional Weekly Flow
Cumulative weekly flow data for foreign and institutional investors was not fully populated, so directional reads are partly inferred from news flow. According to early-week reports, foreign investors recorded approximately 404.4 billion KRW of net buying at the start of the week. However, as the USD/KRW pair surged from around 1,472 to 1,497 KRW (a ~25 KRW move) mid-week, foreign outflow pressure clearly intensified.
Institutional investors led the profit-taking, with KOSDAQ daily net selling estimated at 80–160 billion KRW. Supply/demand fatigue near record-high levels was a key trigger for Friday's sharp decline.
🌍 Global Impact
The three major US indices all closed lower for the week, reinforcing global risk-off sentiment.
| Index | Close | Weekly Change |
|---|---|---|
| S&P 500 | 7,408.50 | -1.24% |
| NASDAQ | 26,225.14 | -1.54% |
| Dow Jones | 49,526.17 | -1.07% |
| USD/KRW | 1,497.76 | - |
US CPI (forecast 0.6%), Core CPI (0.3%), PPI (0.5%), and Retail Sales (0.5%) were all in focus during the week, alongside a Fed Chair nomination vote. With USD/KRW pushing toward the psychologically important 1,500 level, the foreign exchange backdrop weighed directly on foreign equity flows, while weakness in WTI crude added pressure to energy and solar-related stocks.
📋 This Week's Economic Indicators & Earnings
Global Events (High Impact)
| Date (KST) | Country | Event | Forecast | Previous | Actual |
|---|---|---|---|---|---|
| 05/12 21:30 | USD | Core CPI m/m | 0.3% | 0.2% | TBD |
| 05/12 21:30 | USD | CPI m/m | 0.6% | 0.9% | TBD |
| 05/12 21:30 | USD | CPI y/y | 3.7% | 3.3% | TBD |
| 05/13 21:30 | USD | Core PPI m/m | 0.3% | 0.1% | TBD |
| 05/13 21:30 | USD | PPI m/m | 0.5% | 0.5% | TBD |
| 05/14 03:40 | USD | Fed Chair Nomination Vote | Pass | - | TBD |
| 05/14 15:00 | GBP | GDP m/m | -0.1% | 0.5% | TBD |
| 05/14 21:30 | USD | Core Retail Sales m/m | 0.7% | 1.9% | TBD |
| 05/14 21:30 | USD | Retail Sales m/m | 0.5% | 1.7% | TBD |
The week was packed with US April inflation and consumption data. Markets remained cautious over a possible reacceleration in inflation, which contributed to elevated volatility and ultimately to Friday's sharp decline.
Domestic Disclosures
No major DART disclosures were aggregated for this week.
Key Earnings News
- Korea's earnings season remained in progress, with a number of names posting Q3 earnings surprises and attracting investor attention.
- SK Hynix's earnings beat and broader strength in major semiconductor names supported the KOSPI's record-high run, though aggressive profit-taking unwound much of the gain by the end of the week.
- Samsung Electronics' move into the "$1 trillion club" provided early-week momentum and supported leadership in large-cap technology names.
🔮 Next Week Outlook & Key Risks
Next week (May 18–May 22) is expected to begin with a market reassessment of this week's US inflation and retail sales data. Investors will also be watching for the possible release of FOMC minutes, earnings from major US companies such as NVIDIA and Walmart, and Fed officials' speeches throughout the week.
Domestically, the rebalancing of the KOSPI 200 and KOSDAQ 150 indices and the supply/demand effects following the May options expiry are expected to be key swing factors. Whether the market can stage a meaningful rebound after this week's plunge will likely determine the short-term trend.
Key Risk Factors
- (1) FX Risk: A break above 1,500 in USD/KRW may trigger additional foreign capital outflows.
- (2) Inflation Reacceleration: A hot US inflation print may push back Fed rate-cut expectations.
- (3) Profit-Taking Overhang: Additional supply may emerge near record-high levels.
- (4) Geopolitical Risk: Middle East tensions and oil price volatility remain on watch.
- (5) Margin Debt Pressure: Rising margin balances and forced liquidations could worsen supply/demand dynamics.
The 7,400 level on the KOSPI and 1,100 level on the KOSDAQ will be closely watched as first-line technical support next week.
⚠️ Investment Disclaimer
Disclaimer: This post is for informational purposes only and does not constitute investment advice. All investment decisions are the sole responsibility of the investor. Past performance does not guarantee future results. In periods of elevated volatility, such as a sharp drawdown after record highs, a conservative approach—including position sizing, stop-loss discipline, and avoidance of leveraged or margin trading—is strongly recommended.
🇰🇷 Korean Version: https://kai-search.tistory.com/manage/posts/
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