Something unusual happened in the semiconductor market between Monday and Friday. TSMC, the world’s largest contract chipmaker, reported a sharp jump in quarterly profit, exceeded consensus estimates, and lifted both its revenue and capital spending projections for the year. The stock then dropped 7.3 percent in Taipei. It was not an isolated reaction. The Philadelphia Semiconductor Index fell roughly 11 percent over the week and now sits close to 24 percent below the record high it set at the end of June, a decline that meets the conventional definition of a bear market. The VanEck Semiconductor ETF recorded its third weekly loss in four.
The disconnect between operating results and share prices is the story. TSMC reported June revenue of NT$442.68 billion, up 68 percent year on year, and guided to full-year growth above 30 percent on the strength of AI chip orders. ASML raised its 2026 sales guidance to a range of €36 billion to €40 billion. On the evidence of the order books, demand for advanced logic and lithography equipment is not softening. What has changed is the market’s willingness to pay for it. Morgan Stanley attributed part of TSMC’s increased capital budget to inflation in equipment prices rather than expanded capacity, a distinction that matters considerably for margins. Investors appear to have noticed that rising capex accompanied by rising input costs is a different proposition from rising capex driven by volume.
The second pressure point is the return on AI infrastructure itself. The emergence of Chinese models achieving competitive performance at markedly lower training and inference cost has forced a reassessment of how much compute the frontier actually requires. If capability can be bought more cheaply, the projected decade of escalating datacentre construction that underwrites current semiconductor valuations becomes harder to defend. TSMC entered the week trading at roughly 20 times forward earnings against a five-year average near 18, having gained more than 50 percent this year. That is not a bubble multiple, but it leaves no cushion for doubt.
The broader market absorbed the shock unevenly. The Nasdaq Composite closed Thursday down 1.5 percent at 25,881.95 while the S&P 500 lost 0.5 percent to 7,533.77, the gap reflecting how concentrated the index damage was in chips. For three years, semiconductor earnings have functioned as a proxy for the AI thesis. This week they stopped working that way, and investors began pricing the sector on the same terms as any other cyclical capital goods business.