Signal Geopolitics Reshaping Semiconductor Supply Chain Risk in 2026 / US-China Chip War

Summary

Nvidia's share of the Chinese AI chip market fell from more than 90% to roughly 50% by early 2026, though Chinese firms have placed orders for over 2 million H200 units for 2026 delivery after exports resumed following a ten-month freeze, with the US government taking 25% of the resulting revenue; Nvidia had taken a $5.5 billion stranded-inventory charge during the freeze. Tungsten prices surged to $2,250 per metric ton unit, a 557% increase over one year, as China — controlling about 79% of global mine production — cut exports by roughly 40% in 2025. South Korea, which imports about 70% of its crude oil from the Middle East, also hosts Samsung and SK Hynix, which together control about 80% of the global HBM market and 70% of DRAM; both firms' valuations fell more than 20% at the start of related regional conflict tensions. A US Department of Justice indictment alleges a smuggling scheme involving roughly $2.5 billion in restricted Supermicro servers, of which at least $510 million reached its destination, with maximum sentences of up to 30 years for the three defendants. Separately, TSMC began 4nm volume production in Arizona, Samsung's Texas fab reached full 3nm operation, Intel began shipping 18A from Ohio, and US advanced chip manufacturing capacity stood at 22% of the global total per SIA's first-quarter 2026 figures.