Crashes 43.9%, Then Posts Record 17.91% Rebound in July 2026
A circuit breaker is an exchange rule that pauses trading when prices fall too fast. Korea's Kospi triggered one on July 28 and again on July 29, the first back-to-back halts in its history. Two days later the same index posted its largest one-day gain ever. Memory now decides how much US hyperscalers can spend on AI.
What Triggered the Kospi Crash
The trigger came out of China. On July 27, ChangXin Memory Technologies (CXMT) listed in Shanghai after raising $8.6 billion, then closed its debut up 466%. At roughly $487 billion it became China's most valuable listed company. A day later Reuters reported that state-owned Shanghai Aishengna had begun producing immersion DUV lithography machines, the tools that etch circuits onto silicon.
The Numbers Behind the Selloff
The Kospi fell from 9,385 on June 19 to 5,262 on July 29, a 43.9% drawdown. July 28 alone erased 10.84%. On July 31 the index gained 1,001 points to close at 6,595, up 17.91%. SK Hynix hit its 30% daily ceiling and Samsung rose about 27%.
Why This Matters for US Investors
US cloud earnings ended the selloff. Microsoft reported 43% Azure growth and a commercial backlog of $678 billion. Amazon reported 37% AWS growth to $42.2 billion and raised 2026 capital spending from $200 billion to $220 billion, naming higher memory costs. When the largest cloud provider resizes its budget because DRAM got expensive, memory pricing has become a macro variable for the US AI buildout.
Is China's DRAM Threat Real Yet?
Valuation and capability differ. CXMT held about 9% of the global DRAM market in the first quarter of 2026, against Samsung at 36%, SK Hynix at 29% and Micron at 24%. Reuters noted the new lithography tools still need testing and trail ASML widely. Analysts expect direction to matter more than share: US export controls now meet a China learning to build its own equipment.
Key Takeaways
① Two China shocks - CXMT's 466% debut and homegrown DUV lithography landed within 24 hours.
② Record volatility - A 43.9% drawdown, two straight circuit breakers, then a 17.91% gain.
③ Memory sets the budget - Amazon lifted 2026 capex to $220 billion because chips cost more.
Share prices recovered in a day, but the competitor did not leave. Whoever supplies memory at scale now holds leverage over how fast the AI buildout can move.
👉 Korea Chip Exports Explode 180% in July 2026, Shaking Global Markets - also worth a read.
📌 Sources: Reuters, Fortune, The Korea Economic Daily, Benzinga, Yahoo Finance (2026)
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