Why TSMC Stock Dropped Despite Record Q2 Profit and a $100 Billion U.S. Investment Pledge

Margin Pressure from Overseas Fabs

TSMC flagged that the ramp-up of its new overseas factories — including the massive Arizona expansion — would temporarily reduce profitability as they come online . CFO Wendell Huang guided Q3 gross margin to 55.5%–57.5%, down from Q2's 58.6%, citing unfavorable foreign exchange rates and dilution from overseas fab ramps . The company estimated overseas fab dilution at 2%–3% annually in early years, widening to 3%–4% later .

2nm Process Ramp-Up Adds to Cost Concerns

The company warned that the rapid ramp of its 2nm process node would weigh on margins. TSMC shares in Taipei fell NT$180 (7.29%) on this news, closing at NT$2,290 and pushing its market capitalization below NT$60 trillion .

"Buy the Rumor, Sell the Fact"

The market had already priced in a very strong AI-driven quarter. With the actual results meeting rather than surprising to the upside, there was no catalyst for further near-term gains, triggering profit-taking . As one analyst noted, "when a stock is already priced for perfection near its 52-week high, 'record earnings plus higher spending' is not automatically a buy signal" .

Broader AI and Semiconductor Sell-Off

TSMC's drop coincided with a broader rout in AI and semiconductor stocks. The Taiex index suffered its largest single-day point drop in history (down 2,953.71 points or 6.47%), led by TSMC's decline . Broader concerns about tariffs, a potential Chinese AI model breakthrough, and stretched valuations also weighed on the sector .

Bottom Line

TSMC's record Q2 profit was overshadowed by a sharp rise in planned capital spending, margin dilution from overseas expansion, and a market that had already baked the good news into the stock price. The ~3–4% premarket drop in U.S.-listed shares and the 7.29% plunge in Taipei reflected investor anxiety about near-term profitability and the long-term return on that massive investment .