U.S. and Korean tech stocks are now tightly linked — and that could be a worry for investors
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- Kospi-Nasdaq 100 correlation climbed to ~0.50 on a 60-day basis, the highest since 2021, according to data provided by Rayliant.
- Samsung Electronics and SK Hynix together account for more than half of the Kospi and supply the memory chips central to the AI hardware supply chain for U.S. hyperscalers.
- Futurum Group's Rolf Bulk said data-center demand rose from ~40% of global DRAM demand last year to over half this year, and he expects that share to keep climbing.
- SK Hynix posted a record 15% plunge on July 13, dragging the Kospi down more than 8%; the Nasdaq 100 ended 1.88% lower that day, with Micron down 4%, Sandisk off 12% and Intel pulling back 6%.
- Rayliant's Phillip Wool and Futurum's Bulk warn the close linkage erodes geographic diversification — Bulk said a slowdown in hyperscaler capex would hit the Korean market harder than most peers.
- Samsung's earnings arrive roughly two weeks before major U.S. semiconductor companies, giving investors an early concrete read on AI demand each quarter.
- CXMT (ChangXin Memory Technologies) saw shares soar 466% in its Shanghai STAR Market debut, becoming the most valuable China-listed company and flagged as an emerging competitive risk to the Korean duopoly.
Why it matters: With Samsung and SK Hynix now over half the Kospi and more than half of global DRAM demand tied to data centers, the two markets have lost their diversification benefit — Rayliant and Futurum analysts warn a hyperscaler capex slowdown would hit Korea hardest, while Chinese rival CXMT's 466% debut adds a fresh competitive threat to the duopoly.
