✦ The $265B American GigafabNarrow moat

The Arizona project stopped being a gesture and became a cluster: $165 billion committed in March 2025¹ and since expanded toward $265 billion, building to six wafer fabs plus two advanced packaging facilities — the first credible leading-edge manufacturing complex outside Taiwan². The first fab runs 4-nanometer at volume, the second finished construction in April 2026 with production expected in 2027, and the packaging plants — the piece that makes an all-American AI chip possible — target 2028.

The bet cuts two ways, and TSMC knows both edges. Politically it is the answer to the only existential question the company faces — what happens to a Taiwan-concentrated foundry in a Taiwan crisis — and commercially it sits next to its biggest customers' home market and their governments' subsidies. Economically it is dilution by design: American fabs cost more to build and run, and every wafer moved to Phoenix trades margin for resilience. Watch Arizona's yields against Taiwan's, the packaging plants' 2028 date, and the gross-margin drag the company itself keeps flagging — the price of the hedge, paid quarterly.