In 2013, TSMC made a $10 billion bet on a single customer. Morris Chang committed to building 20nm capacity with uncertain economics on the promise that Apple would fill those fabs. “I bet the company, but I didn’t think I would lose,” Chang later said. He was right. Apple’s A8 chip launched in 2014, and TSMC never looked back.Apple’s annual spend at TSMC grew from $2B in 2014 to $24B in 2025. That is 12x in 12 years. Apple went from 9% of TSMC revenue to 25% at its peak and settled to 20% in 20...