Semiconductor Selloff Jul 7 — Korea & US Drop, Bottleneck Odds

Korea: Samsung -6.92%, SK hynix -6.06%, KOSPI -4.91%. U.S.: SOXX ~-6%, Applied Materials ~-10%, AMD ~-8%, Intel ~-10%, Micron ~-6%. Europe: ASML ~-5% and peers (Yahoo). One Samsung print repriced the entire global chip trade.

This article: global Jul 7 drivers → bottleneck primer → scenario probabilities.

Not investment advice. Probability bars are scenario weights, not additive to 100%.

Jul 7 — four layers

① Sell-on-news — record but expectations were higher.
② Earnings growth peak — focus on slowing growth rates.
③ AI rotation — Morgan Stanley pivot to hyperscalers; Meta excess-compute narrative hit SOXX.
④ Equipment/design leverage — AMAT/Intel ~-10%, AMD ~-8% on capex and custom-chip fears.

Jul 7 — Korea & US decline chart

What a bottleneck is

A bottleneck is the narrowest step in the chain — it caps total output. AI GPUs face three largely independent axes: TSMC logic die, HBM3e memory, and CoWoS packaging. Jul 7’s debate: Samsung/SK profits prove HBM pricing power today — but are we at a margin peak?

1. 1
   ① Logic die

   TSMC N4/N3 fab

2. 2
   ② HBM3e

   SK hynix·Samsung·Micron

3. 3
   ③ CoWoS

   TSMC packaging

4. 4
   → GPU

   Nvidia H200/B200

Future binds — scenario weights

HBM (72%), CoWoS (68%), power/grid (58%), ABF substrate (45%), memory glut (42%), custom ASIC (38%), advanced fab (35%), EUV (32%) — author framework for 2026 H2–2028.

Bottleneck probability — chart

Calendar checklist

Jul 30 Samsung full results · late-July hyperscaler capex guidance · DRAM/HBM ASP trend · CoWoS/HBM capacity adds.

Wrap-up

Jul 7 was repricing of peak growth and rotation, not broken fundamentals — yet memory-cycle risk rose. Bottleneck map helps read headline profits in context.

One line. On semi earnings days, trade the expectation gap, not the absolute trillion-won print.

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Jul 7 hit Korea and the U.S. together — on earnings day, trade the expectation gap.

Sources

• IT Chosun — KOSPI -4.91% Jul 7
• MoneyToday — sell-on-news
• Chosun Biz — growth peak / foreign selling
• 24/7 Wall St — global chip selloff
• Yahoo — Samsung spooks chip trade
• Euronews — $100bn mkt cap wipe
• CNA — Morgan Stanley rotation
• Super Financial — H200 supply chain
• Internal: 2026-07-08-semiconductor-selloff-bottleneck-session-01.md