Sep 11 2026 05:38 PM EST

Semiconductor Equipment and Materials: Navigating Volatility Amid AI Growth and Geopolitical Shifts

The US semiconductor equipment and materials sector has swung sharply in 2026, with a 2.4% rebound over the past five days, a steep -28.3% drop across three months, and a 12.5% gain over six months. Behind these moves are rapid shifts in capital spending, AI infrastructure buildouts, supply chain disruptions, and heightened geopolitical risk as investors recalibrate expectations for sector leaders such as Applied Materials (NASDAQ: AMAT), Lam Research, ASML, and a cohort of niche players exposed to high-growth AI and advanced packaging markets.

AI Demand and CapEx Cycles: The Core Growth Engine

The sector’s recent three-month drawdown was not caused by a collapse in end-market demand, but by a complex transition in capital spending cycles. The surge in generative AI and advanced packaging has kept order books robust for companies targeting high-value node equipment, as shown by Applied Materials’ $7.91 billion in Q2 revenue (+11% YoY) and Lam Research’s $6.72 billion driven by NAND and AI-related demand. The US industry is benefitting from over $770 billion in private chip investment since 2020, with 2026 CapEx projections raised 29% to $651 billion, a 53% increase over 2025. Hyperscalers and sovereign AI programs remain the sector’s primary growth catalyst.

Short-term outperformance has clustered in niche players with direct AI exposure. Aehr Test Systems (+8.8% 5-day), Ambarella (+7.9% 5-day), and Cohu (+7.9% 5-day) are benefitting from test, packaging, and automotive AI processor ramp-ups. Ambarella reported record AI-related revenues, while Teradyne’s Q2 2026 results showed 70% of revenue tied to AI demand.

Margin Pressures, Inventories, and Sector Rotation

Despite the AI-driven tailwinds, the sector’s median operating margin contracted to 13.2% for the trailing twelve months ending Q2 2026, down from 16.9% a year earlier. Higher input costs, especially for specialty materials and chemicals, and supply allocation challenges are weighing on profitability. Recent earnings from Entegris and Teradyne highlight robust revenue growth but also note margin pressure, competitive pricing, and uneven demand recovery. The “run-to-order” inventory cycle following the 2023–24 AI boom has forced a 15–20% reduction in quarterly spend, which has particularly impacted legacy equipment makers: Applied Materials (-16%), Lam Research (-16.4%), and KLA (-24.4%) all underperformed over three months.

Sector rotation intensified in late July and early September as investors shifted away from high-beta technology stocks amid rising interest rates, renewed inflation concerns, and uncertainty surrounding US-China trade policy. Bottom performers—Veeco Instruments (-38.6% three months), Axcelis Technologies (-34.7%), Ultra Clean Holdings (-32.1%)—underscore the breadth of the capex pull-back and the market’s sensitivity to macro policy developments.

Geopolitical and Policy Headwinds

Geopolitics remain a defining risk. The intensification of US-led export controls, including new restrictions on advanced lithography shipments to China and 50% tariffs on Chinese semiconductors, has disrupted order visibility and led to shipment delays and order conservatism—ASML’s net system sales to China dropped from 36% in Q4 2025 to 19% in Q1 2026. The phasing out of “CHIPS for America” incentives and US interest rates lingering near 5.25% are further pressuring financing and discretionary equipment spend. These policy shocks, combined with the US tariff regime and the MATCH Act’s potential ban on deep UV equipment to China, have been central to the sector’s repricing.

Industry leaders warn that further tightening of export restrictions or continued delay in capital-intensive purchases would slow top-line growth, even as order books remain strong for advanced packaging and AI-driven tools.

Cyclical Uncertainty and Selective Opportunity

The medium-term outlook remains constructive but clouded by cyclical uncertainty. While the US market for semiconductor machinery is expected to grow to $19.1 billion in 2026 (+4.6% YoY), order visibility outside AI and advanced packaging is limited. Major US reshoring announcements—TSMC’s $165 billion Arizona fab, Samsung’s $44 billion Texas campus—are structurally positive but have yet to fully offset the higher domestic cost base and execution risk. The sector’s median return on equity, at 7.9% for the latest twelve months, reflects a cautious risk-reward balance.

The next catalysts will be the Federal Reserve’s policy decision and the timing of the next wave of AI-chip fab expansions, projected for late 2026 into 2027. Until then, volatility is likely to persist, with selective outperformance from well-positioned firms in AI, edge computing, and differentiated process technology.

In summary, the US semiconductor equipment and materials sector enters late 2026 at an inflection point. While secular AI demand, supply chain regionalization, and fiscal incentives provide a constructive backdrop, the balance of macro headwinds and selective opportunity will dictate market direction in the quarters ahead.