⚠ Foundry & Taiwan ConcentrationHigh threat

Apple designs its own silicon, but it does not make it — the fabrication of its leading-edge chips depends almost entirely on a single foundry, TSMC¹, and TSMC's most advanced production is concentrated on Taiwan, one of the most geopolitically contested places on earth. This is a concentration risk of the first order: the whole silicon advantage, so patiently built, ultimately rests on the uninterrupted output of fabs that sit within reach of a rival power. A blockade, a conflict, or even a severe natural disaster could halt the flow of the one component Apple cannot simply source elsewhere.

What makes this danger unusual is its shape. Unlike most risks it is bimodal — almost nothing in the great majority of years, and catastrophic in the tail. No amount of design brilliance matters if the chips cannot be fabricated, and the leading-edge capacity to make them does not exist, at scale, anywhere else in the world. Apple has more riding on those specific fabs than almost any company alive, and the concentration is getting tighter: TSMC took 72.5% of the world's foundry revenue in the June 2026 quarter, and Samsung, the nearest rival, 5.9%⁴.

The defenses are real but slow. TSMC is diversifying, building fabs in Arizona and Japan², with Apple as an anchor customer for that new capacity; and the whole world, the United States government very much included, has an overwhelming interest in keeping Taiwan's fabs running, which is itself a form of deterrence. But new leading-edge fabs take years to build, and the true frontier stays in Taiwan for now³.

This is the classic tail risk: low probability, extreme severity. It will not trouble a calm year, but it is exactly the kind of event that could, in a bad one, strike not only Apple but the entire technology industry at once — and Apple, having built its edge on the most advanced silicon in existence, has bet more than most on that one island staying quiet.