KOSPI & Korean Stock Market — Major Crash in July 2026
South Korea's stock market is going through an unprecedented rout. Here's what's happening:
The Numbers (as of July 29, 2026)
- KOSPI closed at ~5,663 on July 29, down 5.98% for the day and 10.84% on July 28
- The two-day drop triggered back-to-back circuit breakers — a historic first for the KOSPI
- July is on track to be the worst month in KOSPI history, with losses exceeding 30% — erasing more than a year's worth of gains
- The KOSPI had more than doubled during H1 2026, even crossing 9,000 for the first time on June 18
What Caused the Crash? Three Simultaneous Shocks
- SK Hynix's Q2 earnings miss — Despite posting a record quarter (₩60.54T operating profit, up 557% YoY, 76% operating margin), SK Hynix still missed analyst consensus by ~6.6%. The market had priced in perfection, and the slower-than-expected ramp of next-gen HBM4 chips delayed revenue recognition. Samsung's preliminary Q2 guidance also narrowly missed revenue expectations.
- China's CXMT IPO — ChangXin Memory Technologies raised $8.6B (Asia's largest IPO of 2026) and surged 466% on debut, raising fears of a commodity DRAM supply glut that could pressure pricing across the board.
- China's domestic DUV lithography production — A Chinese state-backed company began manufacturing immersion deep ultraviolet lithography machines domestically, challenging the decade-long Western export-control strategy that assumed China couldn't build such tools independently. This shook confidence in the "permanent moat" thesis behind Korean chipmaker valuations.
- Nvidia's $250B OpenAI financing deal — Reports that Nvidia is guaranteeing OpenAI's datacenter debt reignited fears of "circular financing" (Nvidia guarantees OpenAI's debt → OpenAI buys Nvidia chips → Nvidia books revenue), raising questions about whether AI demand is real or artificially inflated.
The Structural Problem
The KOSPI is essentially a leveraged bet on two companies — Samsung Electronics and SK Hynix, which together account for 40%+ of the index's market cap. When those chip stocks sneeze, the whole market catches a cold.
- Samsung fell ~13% Tuesday + 5.2% Wednesday
- SK Hynix fell ~16% Tuesday + 9.6% Wednesday
- Combined, the two lost roughly $270 billion in market value over two sessions
What's Next?
- Samsung releases full Q2 results on July 30 — but given SK Hynix's experience, even record earnings might not be enough to calm nerves
- South Korea's Finance Minister apologized for leveraged ETFs that amplified the sell-off
- The Korea Financial Services Commission is considering tighter leverage controls
- Foreign investors turned net sellers; retail sold ₩2T+ net; institutions bought ₩2.4T but couldn't absorb the pressure
Bottom line: This isn't just a Korean problem — it's a global reckoning over whether AI infrastructure spending is sustainable, durable demand or a financing loop. The KOSPI crash is the clearest proxy for that question right now.