TSMC's US plant has swung from heavy losses to its most profitable overseas operation, a win for the company and for Washington's push to bring chipmaking home.

• The Arizona plant made more money in the first half of 2026 than TSMC's Shanghai and Nanjing plants combined.
• Profit there jumped 600% from a year earlier, after losing money through 2023 and 2024.
• The turnaround comes from strong yields matching Taiwan's factories and big customers filling the plant to capacity.
• The China plants run older, cheaper chip technology, while Arizona makes advanced 5nm and 4nm chips and is moving to 3nm and 2nm.
• Critics in Taiwan who wrote off the US project as a costly mistake have been proven wrong so far.

Outlook: With the newest chip lines heading to Arizona, the plant's earnings look set to keep climbing and pull further ahead of TSMC's China sites.