European Semiconductor Stocks Diverge as AI Photonics Demand Soars

European semiconductor stocks diverged sharply on Thursday, with French materials supplier Soitec surging 23% on booming photonics demand for AI applications, while STMicroelectronics fell 15% on weak quarterly profit and BE Semiconductor Industries slid 3% on revenue slightly below consensus. Soitec forecast second-quarter revenue growth exceeding 30% and said revenue from its Photonics-SOI business would more than double from over $100 million in the prior year, highlighting accelerating demand for photonics wafers used in AI. The market reaction underscores a growing bifurcation between companies supplying AI-enabling technologies and those tied to legacy cyclical markets, as investors question future revenue sources amid rising AI infrastructure spending.

July 23, 2026, Inside AI — European semiconductor stocks diverged sharply on Thursday as investors parsed a wave of earnings reports, with French materials supplier Soitec surging on booming photonics demand tied to artificial intelligence, while STMicroelectronics and BE Semiconductor Industries Besi tumbled on near-term headwinds and lofty growth expectations. Soitec shares jumped roughly 23% after the company beat sales forecasts by a wide margin and forecast second-quarter revenue growth exceeding 30% . The company highlighted accelerating demand for photonics wafers used in AI applications, saying revenue from its Photonics-SOI business was expected to more than double from slightly above $100 million in the prior year. STMicroelectronics fell 15% after reporting quarterly profit below expectations, with investors focused on the pace of recovery in its automotive and industrial markets. Dutch equipment maker Besi slid around 3% despite strong order bookings, as second-quarter revenue came in slightly below consensus. Andrew Gardiner, head of European technology equity research at Citi, said consensus forecasts already assumed strong growth in 2026 and 2027, raising the hurdle for further upside. Rushabh Amin, multi-asset portfolio manager at Allspring Global Investments, captured the shifting sentiment: "You're seeing more questions being asked about where's the future revenue going to come from. Twelve months ago the rage was about hyperscalers and the same questions were asked. Now, the semis came into the fold." The market reaction underscores a growing bifurcation in Europe's chip sector between companies directly supplying AI-enabling technologies and those tied to legacy cyclical markets. Soitec's engineered substrates, particularly silicon-on-insulator wafers, are critical for high-speed optical interconnects in data centers—a segment where demand is surging as AI clusters scale. A recent research paper on silicon photonics for AI https://arxiv.org/abs/2307.07328 highlights how photonic integrated circuits can reduce latency and power consumption in AI workloads, validating the technology's long-term relevance. STMicro's struggles reflect persistent inventory corrections in automotive and industrial end markets, which have lagged the AI-driven boom. The company's exposure to mature-node chips for electric vehicles and factory automation has left it vulnerable to softening demand, even as its silicon carbide business benefits from electrification trends. Besi's modest decline, despite robust orders, suggests that even AI-adjacent equipment makers face intense scrutiny when valuations price in perfection. Nokia's Supply Chain Squeeze Exposes AI's Hidden Costs Nokia offered another lens on AI demand, with CEO Justin Hotard noting that supply constraints remain the main industry bottleneck, forcing customers to place longer-term orders. Hotard told Reuters the company was feeling the impact of rising memory prices as AI customers competed for chip supply. "Where we have pricing that we can't absorb through a different design, we're passing it on to customers," he said. Nokia's shares were little changed despite a second-quarter profit beat, reflecting a market already pricing in network infrastructure growth. The company's commentary aligns with broader industry data showing memory chip prices rising sharply due to AI server demand, as detailed in a Semiconductor Industry Association report https://www.semiconductors.org/wp-content/uploads/2023/06/SIA-2023-State-of-the-Industry-Report.pdf on supply chain dynamics. Hyperscaler Spending Tests Investor Patience The European chip moves come as Google owner Alphabet reported record cloud growth earlier this week but faced investor scrutiny over a $15 billion increase in planned 2026 capital spending. The juxtaposition of soaring AI infrastructure investment against near-term earnings pressure is reshaping how markets value semiconductor firms, rewarding those with immediate AI revenue visibility and punishing those with longer recovery timelines. Soitec's photonics surge and Nokia's supply constraints illustrate that AI's ripple effects extend well beyond GPU makers, but the selloffs in STMicro and Besi show that not all chip stocks will ride the wave equally. As the industry navigates a multi-speed recovery, investors are increasingly discriminating between structural AI winners and cyclical laggards.