Chip ETF's Week of Contradictions: Polysilicon Tariffs Lift Some Stocks While US Tech Heavyweights Sink

Chip stocks gain weekly but face tariff headwinds, China retaliation, and high volatility as AI-driven gains fade.

The semiconductor sector delivered a study in contrasts this week, with Washington's latest trade salvo against China creating clear winners and losers across the supply chain. The VanEck Semiconductor UCITS ETF, a broad gauge of US-listed chip names, closed Friday at €93.61, up 6.01% on the week — yet the headline gain masks a market wrestling with competing forces.

Tariff Blow Lands on a Critical Input

The White House announced Thursday a 15% additional tariff on polysilicon derivatives, effective December 4, following a Section 232 investigation. The measures also establish minimum import prices: $21 per kilogram for polysilicon, $100 per kilogram for ingots and wafers, plus floor prices for solar cells and modules. Notably, the scope extends to 300-millimeter semiconductor wafers under the SEMI M1 standard, placing a raw material shared by both the solar and chip industries squarely in the crosshairs of US trade policy.

China's dominance of this supply chain is stark. Beijing controls more than 90% of global polysilicon production, while the US share has collapsed from 50% in 2005 to under 2% today. The response from Beijing was swift: officials condemned the tariffs and pledged retaliation, including export controls on drones and sanctions targeting several American firms.

Market Reaction Splits Along Geographic Lines

The tariff news triggered sharply divergent moves. US solar names rallied in premarket trading, with First Solar climbing 6% and SolarEdge adding 1%, while an Invesco solar ETF gained 2%. Across the Pacific, South Korea's Hanwha Solutions and OCI Holdings each jumped more than 11% on expectations they would capture market share displaced from Chinese competitors.

Chinese optical component makers suffered the opposite fate. InnoLight and peers saw losses exceeding 18% within a month, pressured further by a threatened FCC import ban on Chinese optical transceivers.

US Tech Heavyweights Feel the Heat

Adding to the sector's turbulence, major US technology stocks came under selling pressure. Alphabet shares fell 1.29% to $354.30 on Friday — its steepest daily decline since mid-May — after a House member disclosed trading activity in Alphabet and Broadcom securities. Trading volume ran roughly 12% above the 30-day average.

The broader SOXX chip index, which tracks many of the same names held by the VanEck fund, had already retreated about a quarter from its highs. Leveraged semiconductor ETFs suffered even more dramatic losses, down as much as 62% in recent weeks.

Recovery Remains Incomplete

Despite the weekly gain, the ETF still sits 15.80% below its 52-week high of €111.18, reached on June 30. The fund's annualized 30-day volatility stands at a striking 57.78%, underscoring how sensitive the market has become to geopolitical headlines and the rapid scaling of AI-related investment. The 50-day moving average of €97.75 also remains above the current price, suggesting overhead resistance persists.

Counterweights: Subsidies, Records, and New Capacity

Not every corner of the industry is feeling the strain. The US government awarded GlobalFoundries $300 million in CHIPS Act funding in July, taking an equity stake of roughly 1% in the company. Amkor and KLA both posted record results, pointing to a healthier picture further up the supply chain. The proposed Skyworks-Qorvo merger also continues to advance with its leadership team now in place.

The week also brought fresh evidence of the industry's structural transformation. Texas Governor Greg Abbott announced on August 6 that SpaceX will build a $16.8 billion chip facility — dubbed "Terafab" — in Grimes County, designed to produce AI chips, logic components, and memory under one roof without relying on external foundries. The vertically integrated model signals a broader trend of tech giants seeking greater control over their chip supply.

Fundamentals vs. Fragility

Earnings season added another layer of complexity. AMD posted record second-quarter revenue of $11.5 billion, up 50% year over year on AI infrastructure demand. Astera Labs also delivered record numbers: $392.4 million in quarterly revenue, a 104% increase.

For investors in the VanEck Semiconductor UCITS ETF, the picture is genuinely two-sided. Trade policy tailwinds benefit equipment makers and suppliers outside China, while individual US heavyweights face near-term jitters. The combination of protectionist industrial policy, multibillion-dollar subsidy programs, and volatile single-stock moves suggests elevated sector swings are likely to persist as the industry adapts to its new trade environment.