[2026.06/08~06/12] Korea Stock Market Weekly Review | Black Monday Circuit Breaker & V-Shaped Rebound

📊 This Week at a Glance

This week (June 8–12) the Korean stock market hid an extreme roller-coaster ride behind its modest weekly gains. The week opened with a 'Black Monday' circuit-breaker shock, but both indices staged a sharp V-shaped rebound to close higher: the KOSPI rose +0.94% and the KOSDAQ surged +7.24% on the week. Notably, the harder-hit KOSDAQ reclaimed the 1,000 level and far outpaced the large-cap-heavy KOSPI.

Index	Week Open	Week Close	Week High	Week Low	Weekly Change	Weekly Volume
KOSPI	8,048.09	8,123.62	8,434.40	7,394.46	+0.94%	233,375.3만
KOSDAQ	959.61	1,029.05	1,049.70	908.46	+7.24%	313,946.2만

The KOSPI swung more than 1,040 points between its weekly high of 8,434.40 and low of 7,394.46, and weekly volume exceeded 2.3 billion shares as panic selling and bargain-hunting collided fiercely.

📅 Daily Performance

The week followed a classic high-volatility pattern: Monday crash → Tuesday surge → Wednesday pullback → Thursday–Friday consecutive rebounds.

Date	KOSPI Close	KOSPI Change	KOSDAQ Close	KOSDAQ Change
6/08 (Mon)	7,484.41	-8.29%	911.39	-9.08%
6/09 (Tue)	8,096.93	+8.18%	967.81	+6.19%
6/10 (Wed)	7,730.82	-4.52%	951.63	-1.67%
6/11 (Thu)	7,763.95	+0.43%	996.93	+4.76%
6/12 (Fri)	8,123.62	+4.63%	1,029.05	+3.22%

The peak of the week's volatility came on June 8, when both indices plunged more than 8% simultaneously, triggering circuit breakers in tandem.

📈 KOSPI Weekly Analysis

The KOSPI opened the week at 8,048.09 and closed at 8,123.62 for a +0.94% gain, but that headline figure masked an extreme roller-coaster. On June 8, a shock from weak US employment data, a sell-off in semiconductors (Samsung Electronics -6.40%, SK Hynix -9.92%), and the US 10-year Treasury yield breaking above 5% combined to send the index tumbling -8.29%, triggering a circuit breaker and pushing it to the weekly low of 7,394.46.

However, the next day (6/9) institutional buying drove an +8.18% rebound that reclaimed the 8,000 level. The index then absorbed further volatility — a -4.52% drop on 6/10 followed by consecutive gains on 6/11–12 (+0.43%, +4.63%). Trading value exploded as capitulation and bargain-hunting clashed. HL Mando and KEPCO E&C hit their daily upper limits, while large-cap cyclicals such as Hanmi Semiconductor (+70,000 won) and Hyundai E&C (+34,800 won) led the rebound.

📉 KOSDAQ Weekly Analysis

The KOSDAQ jumped from 959.61 to 1,029.05 for a +7.24% weekly gain, far outpacing the KOSPI and reclaiming the 1,000 mark. On June 8 it crashed -9.08% (KOSDAQ 150 basis), triggering its own circuit breaker and bottoming at the weekly low of 908.46, before powering back with +6.19% on 6/9, +4.76% on 6/11, and +3.22% on 6/12 to close in on the weekly high of 1,049.70.

A string of limit-up moves in semiconductor equipment names (Wonik IPS, HPSP, Park Systems) and nuclear-power equipment (BHI) drove the index rebound. Because its decline had been deeper, the KOSDAQ rebounded with greater elasticity than the large-cap KOSPI, as bargain-hunting concentrated in small- and mid-cap growth stocks.

🔥 Weekly Themes & Sectors

By sector, cyclical and policy-driven themes took center stage. Construction (+12.64%) topped all sectors, followed by Electric Utilities (+11.38%) on nuclear-power momentum, Credit Cards (+9.23%), Conglomerates (+8.67%), Interactive Media & Services (+8.56%), and Display Panels (+7.66%).

Top-Performing Sector	Weekly Change
Construction	+12.64%
Electric Utilities	+11.38%
Credit Cards	+9.23%
Conglomerates	+8.67%
Interactive Media & Services	+8.56%
Display Panels	+7.66%

Key Weekly Themes

• Nuclear Power & Electric Equipment (Up): Nuclear-related names such as KEPCO E&C (limit-up) and KEPCO KPS, along with the Electric Utilities sector (+11.38%), surged. Nuclear-equipment plays like BHI (KOSDAQ limit-up) rallied in tandem, forming a leading theme.
• Semiconductor Equipment & Materials (Up): After Monday's plunge, KOSDAQ semiconductor-equipment names such as Wonik IPS, HPSP, SEMI TS, and Park Systems led the rebound with limit-up moves. Hanmi Semiconductor (+70,000 won) was also strong, though COMICO fell — highlighting stock-by-stock divergence.
• Construction (Up): The Construction sector topped all groups at +12.64%. Large-cap builders and parts makers including Hyundai E&C (+34,800 won) and HL Mando jumped as rotation flowed into cyclical value stocks.
• Semiconductor Inverse ETNs (Down): Kiwoom, Hana, and Mirae Asset Inverse 2X semiconductor ETNs dominated the weekly losers. These leveraged inverse products, which bet against a chip rebound, slumped to form the week's weakest theme.

💰 Foreign & Institutional Weekly Flow

Detailed weekly flow data was not tabulated, but news flow indicates that large-scale foreign selling from early June through the 8th (reports cited net sales in the 7-trillion-won range mid-week) drove the won/dollar rate up toward the 1,540 level and triggered the capitulation. During the subsequent rebound, reports confirm that institutional buying led the recovery of the 8,000 level. In other words, a handoff from 'foreign capitulation' to 'institutional bargain-buying' was the core engine of this week's V-shaped rebound.

🌍 Global Impact

The source of this week's volatility was external. A shock from weak US employment data, fears of slowing AI demand, and the US 10-year Treasury yield breaching 5% combined to spread global risk-off sentiment rapidly, culminating in Korean circuit breakers. Later in the week, however, the three major US indices regained their footing, providing a supportive backdrop for the domestic rebound.

Index	Close	Change
S&P 500	7,431.46	+0.50%
NASDAQ	25,888.84	+0.31%
Dow Jones	51,202.26	+0.70%

The won/dollar rate (USD/KRW) stood at 1,517.89, still elevated, leaving lingering outflow pressure on foreign capital. Major events scheduled during the week — US CPI and PPI, plus ECB and BOC rate decisions — were the backdrop that amplified volatility.

📋 This Week's Economic Indicators & Earnings

Major Global Indicators (High Impact)

Date	Country	Event	Actual	Forecast	Previous
6/10	USD	CPI y/y	TBD	4.2%	3.8%
6/10	USD	Core CPI y/y	TBD	2.9%	2.8%
6/10	USD	CPI m/m	TBD	0.5%	0.6%
6/10	USD	Core CPI m/m	TBD	0.3%	0.4%
6/10	CAD	BOC Overnight Rate	TBD	2.25%	2.25%
6/11	EUR	ECB Main Refinancing Rate	TBD	2.40%	2.15%
6/11	USD	PPI m/m	TBD	0.7%	1.4%
6/11	USD	Core PPI m/m	TBD	0.5%	1.0%
6/12	GBP	GDP m/m	TBD	-0.1%	0.3%

* The figures above reflect the collected calendar's scheduled releases; actual results require further confirmation. In particular, the US CPI (headline forecast 4.2%) and PPI results were the core variables directly tied to this week's rate shock.

Domestic Disclosures

No major DART disclosures were collected for this week.

Earnings Trends

Amid continued coverage of the Q3 listed-company earnings season, semiconductor industry momentum underpinned the late-week rebound in equipment names. That said, concerns over a slowdown in the memory cycle remain a lingering source of volatility.

🔮 Next Week Outlook & Key Risks

Next week's key variables will be the market's digestion of this week's US CPI (headline forecast 4.2%, core 2.9%) and PPI results, and the repricing of the inflation and rate paths. Alongside the follow-through from the ECB (forecast to hike its policy rate to 2.40%) and BOC decisions, watch whether the US 10-year Treasury yield settles around 5% and where the won/dollar rate heads from the 1,500 level. Also worth monitoring: confirmation of earnings and industry momentum in large-cap semiconductors, and the durability of rotation into nuclear-power and construction policy plays.

⚠️ Investment Disclaimer

Having experienced the extreme volatility of a Black Monday circuit breaker this week, investors should stay alert to the following risks next week:

• Rate Risk: A renewed move above 5% in the US 10-year yield could put further pressure on semiconductor and growth-stock valuations.
• FX & Flow Risk: If the won/dollar rate persistently holds above 1,520, foreign net selling could resume.
• Macro Shock Recurrence: As Monday's plunge showed, US-driven macro shocks such as slowing AI demand or employment surprises could recur.
• Profit-Taking & Leveraged Inverse Losses: Beware of profit-taking after the sharp short-term rebound, and of mounting losses in inverse ETNs amid volatile conditions.
• Volatility Recurrence: Should volatility on the scale of Black Monday return, circuit breakers and sidecars could be triggered again.

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.

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