Seoul — July 28, 2026. Published after the market close; prices are official closing values.
The 30-second version
- The KOSPI collapsed 10.84% to 6,023.66, briefly breaking below 6,000 intraday (low: 5,992.91). The KOSDAQ fell 7.72% to 705.85.
- Both exchanges triggered their emergency brakes: sell-side sidecars and 20-minute circuit breakers (explained below).
- The trigger: chip-sector weakness in the US plus reports of a planned listing by China’s CXMT and mass production of Chinese-made DUV lithography equipment, stoking fears about Korea’s semiconductor franchise.
- Samsung Electronics fell 13.39%, SK hynix 14.65%.
- Foreign investors net sold roughly KRW 4.96 trillion (about $3.4 billion) on the KOSPI; individuals bought roughly KRW 4.32 trillion against them.
- SK hynix reports earnings July 29, Samsung Electronics July 30.
A circuit-breaker session
Korea’s two main equity markets both hit their emergency stops today. First came the sidecar — a five-minute suspension of program sell orders that activates when index futures move sharply. Think of it as a speed bump for algorithmic selling. When that wasn’t enough, both markets triggered the circuit breaker, which halts all trading for 20 minutes — a full stop designed to let panicked participants catch their breath. Having both fire on both the KOSPI and KOSDAQ in a single session is a rare event.
It didn’t stop the slide. The KOSPI closed down 732.09 points at 6,023.66, its worst showing in a July that was already brutal: the index stood at 7,475.94 on July 10, then whipsawed through sessions of -8.95%, +6.24%, -6.37%, and -5.72% before today’s drop. Every one of the eight KODEX sector-ETF proxies we track fell, led by the semiconductor proxy at -13.85%, with construction (-8.82%) and securities (-8.70%) close behind. (These are ETF proxies and can deviate slightly from official sector indices.)
Why today: a China chip scare on a fragile market
The overnight setup was soft but not catastrophic — the Philadelphia Semiconductor Index fell 2.23% in the prior US session while the S&P 500 was flat. What turned softness into panic was news flow out of China: reports that memory maker CXMT plans a stock listing, and that Chinese-made DUV (deep ultraviolet) lithography equipment is entering mass production. DUV machines are the workhorses of chip manufacturing, and the prospect of China building a credible domestic supply chain strikes directly at Korea’s most important export industry.
Hence the concentration of damage: Samsung Electronics (-13.39% to 220,000 won) and SK hynix (-14.65% to 1,550,000 won) — the two stocks that anchor the KOSPI — absorbed the heaviest selling, and equipment maker Hanmi Semiconductor fell 12.22%. The timing sharpens the anxiety: SK hynix reports earnings tomorrow (July 29) and Samsung the day after. Notably, oil was not part of the problem — WTI eased 1.94% to $81.01 — and defensive pockets held up, with Samsung Biologics actually closing up 0.26%.
The flows: foreigners out, retail in — with leverage
Foreign investors drove the decline, net selling roughly KRW 4.96 trillion (about $3.4 billion) on the KOSPI today, with some tallies as high as KRW 5.74 trillion. Individual investors leaned hard against them, net buying roughly KRW 4.32 trillion (about $3.0 billion) — not nearly enough to hold the line. This wasn’t a bolt from the blue: in the previous session (July 27), foreigners had already net sold KRW 2.88 trillion across the KOSPI and KOSDAQ combined.
Two details stand out. First, retail investors bought roughly KRW 734.9 billion (about $500 million) of single-stock leveraged ETFs and ETNs tied to Samsung Electronics and SK hynix — doubling down with amplified exposure on the market’s worst day of the month. Second, there is still dry powder: investor deposits (sidelined cash at brokerages) stood at KRW 105.6 trillion (about $72 billion) as of July 24, while margin loan balances — retail leverage — were KRW 32.7 trillion (about $22 billion) as of the same date.
The corporate calendar rolled on beneath the chaos: HD Hyundai declared subsidiary dividends and Hanmi Pharmaceutical posted preliminary results, per official DART filings.
Key closing numbers
| Item | Close | Change |
|---|---|---|
| KOSPI | 6,023.66 | -10.84% |
| KOSDAQ | 705.85 | -7.72% |
| Samsung Electronics | 220,000 won | -13.39% |
| SK hynix | 1,550,000 won | -14.65% |
| USD/KRW (Seoul close) | 1,462.5 | -6.0 won |
| VIX | 19.04 | +1.98% |
| WTI crude | $81.01 | -1.94% |
Note: a global 24-hour FX feed showed USD/KRW at 1,460.09; the official Seoul session close of 1,462.5 can differ slightly. Index and single-stock closes were cross-verified against the official exchange feed.
What to watch next
- SK hynix earnings, July 29 — the first direct test of whether the China-competition fear matches memory-market reality.
- Samsung Electronics earnings, July 30 — same question, bigger index weight.
- Korea customs 10-day trade data, around August 1 — the fastest hard read on chip export momentum.
- Foreign flow follow-through — today’s selling followed KRW 2.88 trillion of combined net selling the prior session; a third heavy day would signal positioning change, not just panic.
- The 6,000 level — the KOSPI touched 5,992.91 intraday and closed just above it.
FAQ
Why did the KOSPI crash today?
A combination of overnight weakness in US chip stocks (the Philadelphia Semiconductor Index fell 2.23%) and reports that China’s CXMT plans a listing while Chinese-made DUV lithography tools reach mass production. That raised fears of intensified competition for Korea’s semiconductor industry, and foreign investors sold roughly KRW 4.96 trillion of KOSPI stocks.
What are the sidecar and circuit breaker in the Korean stock market?
A sidecar pauses program (algorithmic) sell orders for five minutes when futures prices move sharply — a speed bump. A circuit breaker halts all trading for 20 minutes after an extreme index decline — a full stop. Both activated on both the KOSPI and KOSDAQ today.
Did the KOSPI fall below 6,000?
Briefly, yes. It touched 5,992.91 intraday before closing at 6,023.66, down 10.84%.
Was this only a semiconductor problem?
Chips led the damage — Samsung Electronics fell 13.39% and SK hynix 14.65% — but the selling was broad: all eight sector-ETF proxies declined, and autos, steel, and financials all fell hard. Only isolated names such as Samsung Biologics (+0.26%) escaped.
Disclaimer: This is an information and analysis publication, not investment advice. See our Methodology for data sources, standards, and our corrections policy.