Taiwan Semiconductor Manufacturing Co. (TSMC), the world's largest contract chipmaker, just posted the best quarter in its history — and used the moment to make a massive new bet on American soil.

The company reported record second-quarter 2026 results, with net income jumping 77% year-over-year to a record NT$706.5 billion, according to reporting from finance.biggo.com and Yahoo Finance. Revenue hit $40.2 billion, up 36% from a year earlier, as demand for artificial-intelligence chips continued to sell out its factories. The results beat analyst estimates, and TSMC raised its full-year 2026 revenue growth outlook to slightly above 40%, up from a prior forecast of more than 30%.

Driving it all is AI. TSMC makes the advanced processors that power the AI boom, and CEO C.C. Wei told analysts that AI demand can run through 2030, according to The Loadstar. The high-performance computing segment surged, and the company forecast around $45 billion in revenue for the next quarter, per Crypto Briefing.

TSMC also announced it will invest an additional $100 billion to expand its chipmaking operations in Arizona, the BBC reports, raising its total U.S. commitment to $265 billion and promising "high-tech, high-paying jobs." Reports from azcentral and 9to5Mac note the company signaled it could eventually build four more Arizona plants — and floated as many as 12 in total, a figure some outlets urged readers to treat with caution.

Markets reacted with mixed nerves. Despite the strong guidance, TSMC shares fell after earnings, per GuruFocus, and its record capital-spending plans rattled memory-chip rivals: Micron and SK Hynix stocks dropped as the outlook sparked a broader chip selloff, according to Invezz.

Why it matters: TSMC's numbers are a real-world gauge of whether the AI spending frenzy is sustainable — and its Arizona expansion signals that the most advanced chipmaking is steadily shifting toward the United States.