[2026.05/18~05/22] Korea Stock Market Weekly Review | KOSPI V-Shaped Rebound +5.43% After 42T Won Foreign Selloff
📊 This Week at a Glance
The Korean stock market staged a dramatic V-shaped recovery this week. After a massive foreign selloff dragged the KOSPI down to the 7,200 level mid-week, a powerful late-week rebound lifted the index to close +5.43% for the week. The KOSDAQ also reversed three straight days of losses, surging over the final two sessions to post a +3.43% weekly gain. It was a week of extreme volatility.
| Index | Week Open | Week Close | Week High | Week Low | Week Volume | Weekly Change |
|---|---|---|---|---|---|---|
| KOSPI | 7,443.29 | 7,847.71 | 7,886.64 | 7,053.84 | 264,923.5만 | +5.43% |
| KOSDAQ | 1,122.57 | 1,161.13 | 1,165.80 | 1,038.23 | 524,020.8만 | +3.43% |
The USD/KRW exchange rate climbed to 1,520.53, extending won weakness, while US equities maintained a modest upward bias into the weekend.
📅 Daily Performance
The week followed a textbook V-shaped pattern: a soft start, a mid-week plunge, and a late-week surge. The pivotal moment came on Thursday, May 21, when the KOSPI exploded +8.42% in a single session to instantly reclaim the 7,800 level.
| Date | KOSPI Close | KOSPI Change | KOSDAQ Close | KOSDAQ Change |
|---|---|---|---|---|
| 05/18 (Mon) | 7,516.04 | +0.31% | 1,111.09 | -1.66% |
| 05/19 (Tue) | 7,271.66 | -3.25% | 1,084.36 | -2.41% |
| 05/20 (Wed) | 7,208.95 | -0.86% | 1,056.07 | -2.61% |
| 05/21 (Thu) | 7,815.59 | +8.42% | 1,105.97 | +4.73% |
| 05/22 (Fri) | 7,847.71 | +0.41% | 1,161.13 | +4.99% |
📈 KOSPI Weekly Analysis
The KOSPI opened the week firm at 7,516 (May 18, +0.31%), but a roughly 6 trillion won foreign net-selling bomb on May 19 sent the index plunging -3.25%, breaking below the 7,300 level. Wednesday brought a further -0.86% decline, pushing the index down to its weekly low of 7,053.
The turnaround came on May 21, when the KOSPI surged +8.42% to reclaim the 7,800 level in a single session. Bargain hunters absorbed the pressure built up by foreign investors, who had net-sold for nine consecutive trading days and offloaded a cumulative total exceeding 42 trillion won — a classic V-shaped rebound. The index added another +0.41% on May 22 to close the week at 7,847.71, for a weekly gain of +5.43%. The gap between the weekly high (7,886) and low (7,053) underscored just how violent the swings were. Concerns over a K-shaped polarization driven by concentration in large-cap semiconductor names (the so-called "Samjeon-nix" trade — Samsung Electronics and SK hynix) persisted throughout.
📉 KOSDAQ Weekly Analysis
The KOSDAQ started even weaker than the KOSPI. It fell -1.66% on May 18, -2.41% on May 19, and -2.61% on May 20 — three straight declines that dragged it to a weekly low of 1,038. The early-week narrative was dominated by small- and mid-cap names being left behind amid the large-cap concentration.
However, the index rebounded sharply over the final two sessions, gaining +4.73% on May 21 and +4.99% on May 22 to close at 1,161.13. The weekly gain of +3.43% showed somewhat less rebound momentum than the KOSPI, but the late-week recovery was enough to flip the week into positive territory.
🔥 Weekly Themes & Sectors
IT components, energy, and biotech led the rebound among the week's top-performing sectors. During the late-week V-shaped recovery, capital rotated rapidly back into the growth and small/mid-cap sectors that had suffered the steepest declines.
| Sector | Weekly Change |
|---|---|
| Electronic Equipment & Instruments | +8.12% |
| Oil & Gas | +7.37% |
| Health Care Technology | +7.35% |
| Life Sciences Tools & Services | +6.82% |
| Biotechnology | +6.58% |
| Communications Equipment | +6.36% |
Electronic & Communications Equipment (Components & MLCC)
Electronic Equipment & Instruments was the week's strongest sector at +8.12%. MLCC-related names such as Samhwa Capacitor (102,000 won, limit-up +23,500) and Samhwa Electronics (2,680 won, limit-up +615), along with component and materials stocks like BH (39,450 won, +5,750) and Sama Aluminium (96,400 won, +13,300), surged. The component sector rode the coattails of the late-week semiconductor and IT rebound.
Energy (Oil, Gas & Hydrogen)
The Oil & Gas sector gained +7.37%, with hydrogen and fuel-cell names such as Doosan Fuel Cell (98,200 won, +14,700) catching a bid. The weak-won environment, with USD/KRW rising into the 1,520 range, also supported energy and export-oriented stocks.
Bio & Healthcare
Healthcare was broadly strong, with Health Care Technology up +7.35%, Life Sciences Tools & Services +6.82%, and Biotechnology +6.58%. On the KOSDAQ, NatureCell (22,500 won, limit-up +5,190) hit the upper limit as rebound capital flowed into biotech names.
KOSDAQ Inverse ETNs (Decliners)
The late-week index surge dominated the weekly losers' list with KOSDAQ 150 inverse 2X ETNs. It was a costly week for leveraged inverse products that had bet on continued index weakness. On the KOSDAQ, Machina Rocks (54,600 won, -23,400) hit its lower limit.
💰 Foreign & Institutional Weekly Flow
Detailed weekly flow data was not compiled, but per news reports, foreign investors net-sold for nine consecutive trading days through May 19, offloading a cumulative total exceeding 42 trillion won. Their selling was particularly intense on May 19, when they dumped over 6 trillion won in a single day, driving the index plunge.
The subsequent May 21–22 rebound is interpreted as the combined result of easing foreign selling pressure and bargain hunting by retail and institutional investors. However, with no confirmed trend reversal in foreign flows, the potential for renewed volatility remains.
🌍 Global Impact
US equities maintained a modest upward bias into the weekend, providing a supportive backdrop for Korea's late-week rebound.
| Index | Close | Change |
|---|---|---|
| S&P 500 | 7,473.47 | +0.37% |
| NASDAQ | 26,343.97 | +0.19% |
| Dow Jones | 50,579.70 | +0.58% |
That said, the weak won — with USD/KRW climbing to 1,520.53 — acted as a pressure point for foreign capital outflows. Mid-week releases of the FOMC meeting minutes and UK and Canada inflation data kept the market highly sensitive to the interest-rate path.
📋 This Week's Economic Indicators & Earnings
Global High-Impact Events
| Date (KST) | Country | Event | Actual | Forecast | Previous |
|---|---|---|---|---|---|
| 05/19 | GBP | Claimant Count Change | TBD | 23.1K | 26.8K |
| 05/19 | CAD | CPI m/m | TBD | 0.7% | 0.9% |
| 05/20 | GBP | CPI y/y | TBD | 3.0% | 3.3% |
| 05/21 | USD | FOMC Meeting Minutes | TBD | - | - |
| 05/21 | AUD | Employment Change | TBD | 16.7K | 17.9K |
| 05/21 | AUD | Unemployment Rate | TBD | 4.3% | 4.3% |
| 05/22 | GBP | BOE Gov Bailey Speaks | TBD | - | - |
Domestic Disclosures & Earnings
No major DART disclosures were separately compiled for this week. On the earnings front, the recurring theme of earnings surprises and misses continued to be cited as a market variable, with the earnings and industry outlook for large-cap semiconductor names exerting a major influence on the index's direction.
🔮 Next Week Outlook & Key Risks
Inflation prints and monetary-policy events across major economies remain key volatility variables. Shifts in rate expectations driven by Fed officials' remarks and upcoming economic data are expected to directly affect the exchange rate and foreign-investor flows. Whether foreign investors continue to net-sell Korea's large-cap semiconductor names is the single biggest factor for the index's direction next week.
Key Risk Checklist
- Resumption of foreign net selling: With a recent track record of nine consecutive sell days, a renewed wave of selling could push the index back down.
- FX pressure: With USD/KRW elevated in the 1,520 range, pressure for foreign capital outflows may persist.
- K-shaped polarization: Concentration in large-cap semiconductors leaves the durability of the small/mid-cap rebound uncertain.
- Short-term volatility: The late-week surge (KOSPI +8.42% on May 21) raises the potential for short-term profit-taking and renewed volatility.
⚠️ 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. Especially in highly volatile conditions like this week, sharp rallies and selloffs can repeat, so please approach the market carefully with thorough analysis and diversification.
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