TSMC’s Arizona fab is finally profitable after $1.25B in losses

TSMC (TSM) just posted its first profit at the Arizona operation. The US subsidiary booked NT$16.14 billion in profit-sharing after roughly US$1.25 billion in accumulated operating losses across the four years since the Phoenix site broke ground in 2021.

Three things are carrying it. Yield came first: Fab 21's 4nm line is reportedly running around 92%, a few points ahead of comparable Hsinchu output. Volume production succeeded on the first attempt, unusual for a greenfield fab running a node its on-site team did not develop.

Then the customer mix. Apple (AAPL), Nvidia (NVDA), and AMD (AMD) all have 4nm output coming off Fab 21, and they are paying a markup for it. Lisa Su has put the Arizona premium at 5% to 20% over Taiwan; some channel estimates run to 30%. C.C. Wei's pitch is that US-made is a premium product and customers are signing anyway, because supply security against tariff and cross-strait risk is now worth paying for.

And that premium compounds at volume. The site runs 90,000 to 100,000 wafers a month, and a structural price markup multiplied across that throughput is enough to cover the higher US cost base and still clear a profit. The DigiTimes framing that Arizona now out-earns SMIC (SMICY) and UMC (UMC) combined is the commentary's own hook and is not independently corroborated, so treat it as the angle rather than a confirmed number.

One thing the profit figure does not capture: those Arizona wafers still fly back to Taiwan to be diced, tested, and packaged. CoWoS, the packaging step that is the real AI bottleneck, has not moved to Arizona yet. The fab makes money on the wafer, but a complete AI chip still cannot be finished on US soil.

Drafted with AI assistance against parallel reporting.

Sources:

• DigiTimes, “TSMC Arizona profit tops SMIC and UMC combined” (commentary, May 19, 2026)
• TrendForce, “TSMC Flags Four Key Challenges in Arizona Buildout Even as U.S. Fab Beats Expectations” (May 12, 2026)
• Tom's Hardware, Fab 21 4nm yield/quality on par with Taiwan; Arizona 4nm priced higher than Taiwan (2026)
• CNBC, “Nvidia set to supplant Apple as TSMC's largest customer” (Jan 26, 2026)
• DigiTimes, “TSMC's Arizona fab turns profitable, validating US chipmaking push” (Mar 9, 2026)
• Yahoo Finance / Tom's Hardware, Lisa Su on 5-20% Arizona cost premium; C.C. Wei “USA is a premium product” (2026)