Semiconductor stocks tumbled 3-4% on February 26, 2026, three days after 10% global tariffs took effect. AMD dropped 3%, while Applied Materials, ASML, and Broadcom each fell 4%.
The decline occurred despite Nvidia reporting strong Q4 2026 earnings the same day. Nvidia typically rallies on earnings beats, but the stock underperformed, suggesting broader sector pressure outweighed company-specific fundamentals.
The February 23 tariff implementation targets imports across categories, directly impacting semiconductor manufacturers reliant on global supply chains. Chip production involves multiple countries: wafer fabrication in Taiwan and South Korea, equipment from the Netherlands and U.S., and assembly in Southeast Asia.
Applied Materials and ASML face dual exposure. Both sell chipmaking equipment internationally and source components globally. A 10% tariff on imported tools raises costs for foundries like TSMC, potentially reducing equipment orders. Import tariffs on their own supply chains squeeze margins.
AMD and Broadcom design chips manufactured abroad, primarily at TSMC's Taiwan facilities. Tariffs on imported finished chips increase their U.S. sales costs or force price hikes that could reduce demand.
Analysts monitoring the situation assess 72% confidence that tariffs are causing semiconductor underperformance. Test criteria include tracking chip stocks versus broader indices over 30-60 days, analyzing tariff-announcement correlation with sector volatility, and monitoring import cost discussions in earnings calls.
The sector's concentrated selloff contrasts with mixed performance across other industries. Non-tariff-exposed sectors showed relative strength February 26, supporting the hypothesis that trade policy specifically pressures chips.
Upcoming earnings calls from AMD, Applied Materials, ASML, and Broadcom will reveal whether companies discuss tariff impacts on 2026 guidance. Import cost warnings could trigger further sector weakness.
The Philadelphia Semiconductor Index tracks sector performance. Sustained underperformance versus the S&P 500 through March-April 2026 would strengthen evidence that tariffs, not company fundamentals, drive the decline.
Investors face uncertainty about tariff duration and potential exemptions for semiconductor equipment or chips. Without clarity, the sector may continue trading below historical valuation multiples despite strong underlying demand for AI chips and data center processors.