KOSPI Plunges 5.5% in Black Friday Rout as Broadcom Shock Hits Korea
KOSPI Plunges 5.5% in Black Friday Rout as Broadcom Shock Hits Korea
| By DailyPro2025 Analysis Team
Table of Contents
- The Broadcom Earthquake: An Earnings Miss That Rattled Seoul
- Semiconductor Bloodbath: Samsung and SK Hynix Lead Losses
- Foreign Exodus: 20 Days of Selling and 70 Trillion Won Gone
- Securities Firms Reinvent: Branches Shrink, Global Ambitions Grow
- KOSDAQ's 1,000 Level: A Line in the Sand
- AI Supercycle: Has It Peaked or Is This a Pause?
- My Take
The KOSPI index suffered its worst single-day collapse since the pandemic era on Friday, June 5, plunging 478.82 points — a brutal 5.54% decline — to close at 8,160.59. The KOSDAQ index fell 47.29 points (4.50%) to 1,002.44, briefly dipping below the psychologically critical 1,000 level intraday for the first time since January, when it originally breached that threshold. Samsung Electronics tumbled 6.40% to 329,000 won ($213.70), while SK Hynix lost 8.53%, sliding to 2.07 million won ($1,345). Foreign investors dumped 3.521 trillion won ($2.29 billion) in a single session, extending their selling streak to 20 consecutive days with cumulative outflows approaching 70 trillion won ($45.5 billion). I think this is more than a routine correction — the speed, breadth, and foreign participation suggest something structural is shifting beneath the surface.
This was Korea's worst market session since March 2020, when the COVID-19 pandemic triggered a global panic selloff. But unlike that event — a sudden exogenous shock that reversed within months — Friday's rout emerged from a specific corporate earnings disappointment that raises broader questions about the AI investment thesis. The Philadelphia Semiconductor Index fell 2.15% in sympathy, but the damage in Seoul was magnified by Korea's extreme concentration in semiconductor names. The top two KOSPI components — Samsung Electronics and SK Hynix — account for roughly 30% of the index's market capitalization, making any semi-conductor shock a market-wide event.
The Broadcom Earthquake: An Earnings Miss That Rattled Seoul
The trigger for Friday's carnage came from across the Pacific. Broadcom Inc. (AVGO) plunged 12.59% on the New York Stock Exchange on Thursday, closing at $418.91 — its steepest single-day decline since January 27, 2025 (-17.4%), a span of 16 months. CEO Hock Tan told analysts on the earnings call that Q3 AI semiconductor revenue would come in at approximately $16 billion, well below the consensus estimate of $17.2 billion compiled by Bloomberg. That 7% miss sent shockwaves through global semiconductor stocks. Micron Technology fell 7.74%, Sandisk dropped 3.92%, and the broader Philadelphia Semiconductor Index declined 2.15%.
But the damage in Seoul was magnified by two structural factors. First, Korea's stock market is heavily concentrated in semiconductor names — Samsung Electronics alone represents roughly 18% of the KOSPI's total market capitalization, and together with SK Hynix the figure exceeds 30%. When semiconductor stocks sneeze, the KOSPI catches pneumonia. Second, foreign ownership of Korean tech stocks is extraordinarily high. Foreign investors hold more than 50% of Samsung Electronics' floated shares, making these stocks the most liquid vehicle for global capital flows into and out of Korea. When foreign funds decide to reduce emerging market exposure, Korean tech stocks are the first to be sold.
Lee Dong-joo, an analyst at SK Securities, told clients that the fundamental picture for semiconductor equipment has not changed despite the selloff. "Looking at domestic ETF flows over the past week, investors have been selling semiconductor equipment stocks and rotating into large-cap tech names with clearer earnings momentum," he said. "But I don't see any fundamental change in the semiconductor equipment cycle. In fact, earnings estimate upgrades for these names have continued over the past month." He suggested that any further correction would present a buying opportunity, noting that memory production capacity expansion demand in this AI cycle is far stronger than in previous cycles, with capital expenditure intensity rising from 2025 through 2028.
Semiconductor Bloodbath: Samsung and SK Hynix Lead Losses
Korea's two biggest companies bore the brunt of the selloff with asymmetric intensity. Samsung Electronics (005930.KS) dropped 6.40% to 329,000 won ($213.70), its lowest close since early April. The company's market capitalization shed roughly 25 trillion won ($16.2 billion) in a single session. SK Hynix (000660.KS) fared even worse, falling 8.53% to 2.07 million won ($1,345), erasing approximately 18 trillion won ($11.7 billion) in market value. The combined one-day value destruction in these two stocks alone approached 43 trillion won ($28 billion) — roughly the GDP of a small country.
The rout extended well beyond the mega-caps into the semiconductor equipment and materials segment known in Korean markets as "so-bu-jang" (materials, parts, equipment). The volatility was extreme: Wonik IPS, which had surged 29.93% the previous day, reversed to fall 7.31%. Eugene Technology gave back 8.61% after a 29.97% surge. Jusung Engineering fell 10.18% following a 27.22% rally. VM dropped 5.32% after gaining 28.23%. The average two-day swing in these four stocks exceeded 35 percentage points, according to exchange data — a level of volatility normally associated with crypto markets, not established industrial companies.
Yet the selloff was not uniform. Femtech (FEM) gained 13.14% after a 29.96% rise the prior day, and PSK Holdings added 0.79% following a 26.27% surge. I think this divergence within semiconductor equipment is worth watching carefully — the market is starting to differentiate between companies with genuine AI/HBM exposure and those riding the broader wave. Femtech's continued strength suggests investors believe its technology has unique positioning in the high-bandwidth memory (HBM) supply chain that Broadcom's miss does not invalidate.
Foreign Exodus: 20 Days of Selling and 70 Trillion Won Gone
The most alarming data point from Friday might not be the index move itself but the behavior of foreign investors. Offshore funds net sold 3.521 trillion won ($2.29 billion) on the KOSPI market on June 5 alone, extending their selling streak to 20 consecutive trading days. Cumulative foreign net selling has now reached approximately 70 trillion won ($45.5 billion) — a figure that exceeds the annual budgets of most Korean government ministries and is without precedent in the history of Korean capital markets.
Institutions added to the pressure, offloading 943.5 billion won ($613 million) on the day. Retail investors, characteristically contrarian, bought 4.224 trillion won ($2.74 billion) worth of stocks, but their buying was no match for the combined foreign-institutional selling axis. The retail bid has been a consistent feature of Korea's market declines — individual investors have been net buyers in 18 of the last 20 sessions — but it has been systematically overwhelmed by foreign selling.
The mechanism here is straightforward but vicious. Foreign investors sell Korean stocks and convert the proceeds into dollars. That dollar demand pushes the USD/KRW exchange rate higher. A weaker won erodes the won-denominated returns for remaining foreign investors, encouraging more selling. This feedback loop has become the defining feature of Korea's current market stress and is covered in depth in our companion piece on the won's collapse. Until the foreign selling abates, both the currency and the equity market will remain under pressure.
Securities Firms Reinvent: Branches Shrink, Global Ambitions Grow
Amid the market chaos, a quieter structural transformation is underway in Korea's brokerage industry. According to the Korea Financial Investment Association, the top 10 domestic securities firms operated 438 domestic branches as of March 31, 2026, down six from 444 a year earlier. Overseas branches increased by four to 63 over the same period as the industry pivots toward global markets.
Mirae Asset Securities expanded its overseas network from 17 to 19 locations. Kiwoom Securities grew from one to three overseas offices. KB Securities opened a new office in Mumbai, India, in December 2025, reflecting Korea's growing economic ties with South Asia. Mirae Asset's Hong Kong subsidiary became the first Korean brokerage to launch a digital asset retail business — a strategic bet on the convergence of traditional finance and crypto markets.
The financial results tell the story. According to the Financial Supervisory Service, 16 Korean securities firms' overseas subsidiaries posted combined net profit of $455.8 million (654 billion won) last year, a 67.8% surge from the previous year. Ryan O'Connor, CEO of Global X, told reporters in Seoul that "the fundamental outlook remains very positive thanks to enduring structural positives like AI development." Global X — acquired by Mirae Asset in 2018 with $8.1 billion in AUM — now manages over $100.6 billion, a more than 12-fold increase in eight years. Its AI-themed ETF (AIQ) has grown to a $10.3 billion mega-fund. In my view, the international pivot of Korean securities firms is still in early innings — the global revenue share for these firms could double from current levels over the next 3-5 years.
KOSDAQ's 1,000 Level: A Line in the Sand
The KOSDAQ index has been on a remarkable trajectory in 2026. After breaking above 1,000 for the first time ever in January on a closing basis, it rallied to 1,200 by April before giving back most of those gains in the recent correction. Friday's close at 1,002.44 puts the index at a critical inflection point.
The government has taken notice. The Financial Services Commission convened an emergency meeting with securities firms' research center heads and Korea Financial Investment Association officials to discuss KOSDAQ revitalization measures. The National Growth Fund — a 150 trillion won ($97.5 billion) five-year vehicle — is expected to channel approximately 10.4 trillion won ($6.76 billion) into the KOSDAQ market through direct and indirect investment.
Kim Young-hoon, Korea's Minister of Employment and Labor, told Reuters in a Friday interview that Samsung Electronics and SK Hynix should distribute excess profits to suppliers and workers through contract price adjustments. The comment implicitly confirms that Korea's semiconductor sector is experiencing boom-level conditions despite the stock market selloff — a useful reminder that share prices and business fundamentals can diverge sharply in the short term.
AI Supercycle: Has It Peaked or Is This a Pause?
The central question hanging over Friday's selloff is straightforward: has the AI semiconductor supercycle peaked, or is this a temporary breather before the next leg up? Lee Kyung-min of Daishin Securities diagnosed the selloff as a confluence of three factors: Broadcom's disappointing AI revenue guidance triggering weakness in US semiconductor stocks, which provided an excuse for profit-taking in Korean names; a general risk-off shift in investor sentiment tied to Middle East tensions; and capital outflows related to the SpaceX IPO, which is drawing global liquidity toward the United States.
I've been tracking global semiconductor capex cycles for more than a decade, and the current AI-driven demand for HBM and data center investment looks structurally different from previous cycles. The upcycles of 2017-2018 and 2021-2022 were driven by cyclical demand for PCs, smartphones, and enterprise servers. This cycle is driven by structural AI adoption still in its early stages. Major cloud providers — Amazon Web Services, Google Cloud, Microsoft Azure — continue to raise their 2026-2027 capex guidance, with most incremental spending allocated to AI training and inference infrastructure.
Broadcom's $16 billion quarterly AI revenue forecast was disappointing relative to the $17.2 billion consensus, but it still represents robust year-over-year growth. The company's non-AI semiconductor revenue was actually above expectations. The broader debate — whether AI monetization is keeping pace with infrastructure investment — will not be settled in a single trading session. But I think the long-term thesis remains intact: AI is a multi-year, multi-trillion-dollar investment cycle, and Korea's memory and memory-equipment suppliers are essential participants in that cycle.
My Take
Recommendation: Selective Buy — with patience and discipline. I would not try to catch a falling knife in the broad market. But for long-term investors with a 12-24 month horizon, the semiconductor equipment names that have sold off 20-30% from their highs present compelling entry points. In my view, the AI capex cycle has not peaked — it is rotating from GPU procurement to memory and memory equipment, and Korean suppliers are better positioned in the memory segment than the GPU segment.
Probability/Confidence: 65%. Two risks temper my conviction. First, the Korea Discount remains a real factor — foreign investors have shown they will exit Korean equities en masse when global uncertainty rises, and no structural reform is on the horizon to change that behavior. Second, the SpaceX IPO could drain another 10-20 trillion won from Korean markets in the coming weeks as retail investors chase US tech listings, compounding the selling pressure.
Risk Warning: If USD/KRW breaks above 1,550, foreign selling could accelerate further, potentially pushing KOSPI below 8,000. Any escalation in Middle East tensions or further deterioration in US-China semiconductor export controls would compound downside risk. Position sizing is critical — do not allocate more than 5-8% of portfolio to Korean equities at current levels, and consider hedging currency exposure through USD-denominated assets or currency ETFs.
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