TSMC posted record $40 billion revenue. Its stock fell 4%. Investors are no longer buying the AI spending story on faith.

TSMC posted record second-quarter revenue of over $40 billion, up 36% year on year, with net income rising 77%. The result should have been a triumph. Instead, shares fell 4%, dragging the Nasdaq 100 down 1.4% on Thursday and compounding losses from the day before. The problem was not the earnings…