[2026.06/29~07/03] Korea Stock Market Weekly Review | Semiconductor Peak-Out Shock, Sidecar Halt & KOSPI Roller Coaster
📌 Weekly Summary
A semiconductor "peak-out" shock sent the KOSPI plunging -7.89% in a single session on July 2, triggering a sell-side sidecar (circuit breaker). Yet institutions unleashed aggressive buying on the final day, dramatically reclaiming the 8,000 line. For the week, the KOSPI fell -2.95% while the KOSDAQ rose +0.93% — an extraordinary roller-coaster week.
📊 This Week at a Glance
This week (June 29 – July 3), Korean equities absorbed a level of volatility that simple weekly returns fail to capture. The gap between the KOSPI's weekly high of 8,667.73 and its weekly low of 7,378.10 approached 1,300 points. The index closed the week by surging +5.76% on the final session to reclaim the 8,000 mark.
| Index | Weekly Open | Weekly High | Weekly Low | Weekly Close | Weekly Change | Weekly Volume |
|---|---|---|---|---|---|---|
| KOSPI | 8,334.28 | 8,667.73 | 7,378.10 | 8,088.34 | -2.95% | 226,021.8만 |
| KOSDAQ | 860.40 | 955.45 | 823.98 | 868.41 | +0.93% | 300,052.4만 |
The USD/KRW exchange rate spiked to 1,530.15, a 17-year high, fueling foreign outflows. US markets were mixed, with the Dow up +1.14% and the Nasdaq down -0.80%.
📅 Daily Performance
The week opened with strength, collapsed mid-week on semiconductor "peak-out" fears, then rebounded sharply on the final day — a chaotic mix of a V-shaped recovery and a panic sell-off.
| Date | KOSPI Close | KOSPI Change | KOSDAQ Close | KOSDAQ Change |
|---|---|---|---|---|
| Mon 06/29 | 8,394.65 | -0.20% | 920.57 | +8.13% |
| Tue 06/30 | 8,476.48 | +0.97% | 916.18 | -0.48% |
| Wed 07/01 | 8,303.41 | -2.04% | 929.35 | +1.44% |
| Thu 07/02 | 7,648.09 | -7.89% | 866.72 | -6.74% |
| Fri 07/03 | 8,088.34 | +5.76% | 868.41 | +0.19% |
On July 2, sell-side sidecars were triggered on both the KOSPI and KOSDAQ intraday as panic selling reached its peak. The very next day, July 3, having confirmed a floor at 7,378.10, the index staged a record one-day rebound powered by heavy institutional buying.
📈 KOSPI Weekly Analysis
The KOSPI closed the week down -2.95% at 8,088.34, but that headline figure masks extreme volatility. After climbing to 8,476.48 on June 30, the index slipped -2.04% on July 1 as semiconductor "peak-out" concerns emerged. On July 2 the semiconductor shock intensified, and the index cratered -7.89% — triggering a sell-side sidecar and collapsing to the week's low of 7,378.10.
Compounding the damage, the USD/KRW rate surged to a 17-year high in the 1,530 range, provoking foreign net selling (peaking at roughly KRW 2.57 trillion in a single session) and deepening the decline. Yet on the final trading day, July 3, overwhelming institutional net buying combined with retail bargain-hunting through ETFs drove the index up +5.76%, dramatically restoring the 8,000 line. With the gap between the weekly high (8,667.73) and low (7,378.10) approaching 1,300 points, it was a week of volatility at its absolute extreme.
📉 KOSDAQ Weekly Analysis
The KOSDAQ closed the week up +0.93% at 868.41, holding up relatively well versus the KOSPI and decoupling from the main board. Marking the 30th anniversary of its launch on July 1, the KOSDAQ attracted capital rotating out of semiconductors, gaining +1.44% that day, while foreigners maintained a net-buying stance on the junior market (KRW 234.1 billion).
However, it was dragged down -6.74% on July 2 in the wake of the KOSPI crash, entering sidecar territory. On July 3 it managed only a modest rebound (+0.19%), falling short of the KOSPI's dramatic recovery. With a weekly high of 955.45 and low of 823.98, the KOSDAQ likewise digested elevated volatility.
🔥 Weekly Themes & Sectors
Even amid extreme volatility, semiconductors led the rebound while brokerage stocks — beneficiaries of surging trading turnover — provided support. Construction stocks, by contrast, saw a wave of limit-down and sharp declines, ranking as the week's weakest sector.
| Sector (KOSPI basis) | Weekly Change |
|---|---|
| Semiconductors & Equipment | +8.96% |
| Securities/Brokerage | +6.97% |
| Leisure Equipment & Products | +3.83% |
| Aerospace & Defense | +3.71% |
| Stationery | +3.60% |
| Paper & Timber | +3.57% |
Semiconductors & SK hynix Leverage (Up)
The Semiconductors & Equipment sector topped the leaderboard at +8.96% for the week. It plunged on July 1–2 amid the "peak-out" shock, but a surge in the semiconductor duo (Samsung Electronics and SK hynix) on July 3 drove the index rebound. Single-stock leverage ETFs tracking SK hynix — including KODEX, TIGER and RISE — jumped by more than KRW 5,000, dominating the week's top gainers.
Securities/Brokerage (Up)
The Securities sector ranked second at +6.97%. The whipsaw between crashes and surges drove trading value sharply higher, boosting expectations for brokerage commission revenue.
Aerospace & Defense (Up)
The Aerospace & Defense sector gained +3.71%. Hanwha Aerospace jumped +9.7% on July 1, with defense names emerging as a haven for capital fleeing semiconductor volatility.
Construction (Down)
Kumho E&C (preferred, limit-down), Kumho E&C (-2,230), Jinheung Enterprise, Ilsung Construction, Shinwon Engineering & Construction and Sangji Construction all featured prominently among the biggest KOSPI and KOSDAQ decliners, marking construction as the week's weakest theme.
Notable Movers of the Week
| Direction | Stock | Close | Move |
|---|---|---|---|
| Gainers | Samhwa Electronics | 3,575 | Limit-up +825 |
| Justec | 15,790 | Limit-up +3,640 | |
| KODEX SK hynix Single-Stock Leverage | 27,400 | +5,365 | |
| Decliners | Kumho E&C (Pref.) | 30,750 | Limit-down -13,150 |
| Jusung Engineering | 192,600 | -34,900 | |
| Contentree JoongAng | 1,742 | -708 |
💰 Foreign & Institutional Weekly Flow
The defining feature of this week's flows was the stark divergence between foreigners and institutions. Foreigners extended their net-selling streak on the KOSPI to nine consecutive sessions, dumping roughly KRW 2.57 trillion on July 2 alone and driving the index crash. The USD/KRW spike into the 1,530 range further fueled the exodus.
Institutions, by contrast, powered the index back above 8,000 with a "buying storm" on July 3, while retail investors defended the downside by scooping up bargain ETFs during the plunge. On the KOSDAQ, foreigners responded with net buying (KRW 234.1 billion), diverging from their KOSPI behavior. (Detailed weekly investor-by-investor flow data was not provided in this collection.)
🌍 Global Impact
US markets were mixed. The Dow held firm at +1.14%, while the Nasdaq fell -0.80%, with tech weakness giving cover to domestic semiconductor "peak-out" fears. The S&P 500 finished flat (7,483.24).
| Index | Close | Change |
|---|---|---|
| Dow Jones | 52,900.07 | +1.14% |
| S&P 500 | 7,483.24 | 0.00% |
| Nasdaq | 25,832.67 | -0.80% |
The biggest swing factor was the exchange rate. Dollar strength and yen weakness intensified, pushing the USD/KRW to a 17-year high in the 1,530 range and accelerating foreign outflows. Crude oil (WTI) held a relatively stable course.
📋 This Week's Economic Indicators & Earnings
This week was loaded with major US labor and manufacturing data alongside remarks from new Fed Chair Warsh, complicating the market's read on direction.
| Date (KST) | Country | Event | Forecast | Previous | Actual |
|---|---|---|---|---|---|
| 06/30 | CAD | GDP m/m | 0.4% | -0.1% | TBD |
| 07/01 | GBP | BOE Gov Bailey Speaks | - | - | TBD |
| 07/01 | USD | Fed Chairman Warsh Speaks | - | - | TBD |
| 07/01 | USD | ISM Manufacturing PMI | 53.8 | 54.0 | TBD |
| 07/02 | USD | Average Hourly Earnings m/m | 0.3% | 0.3% | TBD |
| 07/02 | USD | Non-Farm Employment Change | 114K | 172K | TBD |
| 07/02 | USD | Unemployment Rate | 4.3% | 4.3% | TBD |
The US June employment data (Non-Farm Payrolls forecast 114K, unemployment 4.3%) drew attention as a key input for gauging the Fed's rate path. Concrete released figures could not be confirmed from available news, so watch the market's digestion of these prints early next week. No separate DART disclosures were captured in this collection.
🔮 Next Week Outlook & Key Risks
Next week (from July 6), the market will continue digesting last week's US June employment data and Fed Chair Warsh's remarks, with a reassessment of the Fed's rate path the central focus. Domestically, the opening of the Q2 earnings season for semiconductor heavyweights such as Samsung Electronics and SK hynix — and the direction of the "peak-out" debate — is expected to steer the index. Investors should also monitor whether the USD/KRW breaks further above the 1,530 range and how persistent foreign net selling proves to be.
Key risks include: (1) the July 3 rebound proving merely a technical bounce should semiconductor "peak-out" fears reignite; (2) further foreign outflows if the USD/KRW cements itself in the 1,530 range at a 17-year high; (3) foreign KOSPI net selling extending beyond nine sessions; (4) contagion from weakness in US tech names such as the Nasdaq; (5) volatility itself — severe enough to trigger sidecars — weighing on investor sentiment; and (6) the potential spread of credit risk among construction and real-estate-related stocks.
⚠️ Investment Disclaimer
Disclaimer: This post is for informational purposes only and does not constitute investment advice. In extreme-volatility periods such as this week — severe enough to trigger sidecars — the risk of forecasts going astray is especially high. All investment decisions are the sole responsibility of the investor. Past performance does not guarantee future results.
🇰🇷 Korean Version: https://kai-search.tistory.com/manage/posts/
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