Chip-related stocks in Japan, South Korea, and Taiwan slump after US curbs on China; on October 10, the PHLX index closed at a low not seen since November 2020
Chip-related stocks in Japan, South Korea and Taiwan slumped as traders returning from Monday's holidays reacted …
Context & Ripple Effects
The selloff shows how US-China chip policy immediately transmits through Japan, South Korea and Taiwan rather than remaining a bilateral issue. That exposure later became two-sided when China limited gallium and germanium exports, forcing the same regional economies to assess supply-chain fallout.
Subsequent coverage of reported tighter US export restrictions points to a recurring market pattern: policy changes around China repeatedly reset expectations for semiconductor-linked companies and the PHLX benchmark.
First-order effects
- Chip-related shares in Japan, South Korea and Taiwan fell as traders repriced the effect of US China curbs; the PHLX closed at its lowest level since November 2020.
- China-facing semiconductor supply chains became an immediate source of valuation risk for listed chip companies across the three Asian markets.
Second-order effects
- Regional suppliers and investors must account for both restricted access to China and potential Chinese responses, as later illustrated by China's limits on gallium and germanium.
- US export-control announcements gain outsized influence over the PHLX and Asian chip equities, making policy exposure a more consequential driver of sector pricing.
Third-order effects
- If reciprocal technology and materials restrictions persist, the semiconductor industry faces a more fragmented supply chain in which Japan, South Korea and Taiwan bear volatility from decisions made in Washington and Beijing.
- The pattern supports a shift from a globally integrated chip cycle toward a policy-constrained cycle, where access to equipment, materials and end markets affects capital allocation alongside demand.
The trend: Semiconductor markets are becoming increasingly shaped by US-China technology controls and reciprocal supply-chain leverage, not solely by chip demand cycles.