Aixtron Stock Jumps 7.75% to €44.08 as GaN MOCVD Demand for Nvidia 800V AI Data Centers Drives Deposition Equipment Rally

By NineScrolls Team · 2026-04-21 · 4 min read · Industry

The Headline Move

Shares of German deposition-equipment maker Aixtron SE (AIXA.DE) climbed 7.75% on Monday, April 20, 2026, closing at €44.08 on XETRA after opening at €43.94 and touching an intraday high of €44.54. Volume hit 199% of the average daily level as the stock broke to a fresh 25-year high.

The move extended a violent rally that has carried the shares 127% higher year-to-date and roughly 183% above their October 2025 levels. Aixtron's market capitalization now stands at €4.99 billion, with the stock trading at a price-to-sales ratio of 8.97 and a P/E of 58.25.

Why the Stock Moved: Nvidia's 800V AI Architecture

The rally is being driven by one variable: Nvidia's shift to an 800-volt high-voltage DC (HVDC) power architecture for its next-generation "Kyber" rack-scale AI systems, scheduled for full-scale rollout in 2027. Kyber racks will demand gallium nitride (GaN) power semiconductors for the high-frequency power conversion stage that feeds dozens of GPUs.

Aixtron's management said in recent commentary that it expects demand for datacom lasers used in AI data centers to more than double this year, and that "power supply for these data centers is projected to become the largest single application for gallium nitride (GaN) power semiconductors." Analysts anticipate visible order increases in the second half of 2026 as Nvidia's 800V ecosystem hardens.

Aixtron's MOCVD Near-Monopoly in GaN

Aixtron is the dominant supplier of metal-organic chemical vapor deposition (MOCVD) tools — the thin film deposition systems used to grow the epitaxial GaN layers at the heart of every GaN power device. Industry estimates credit Aixtron with roughly 71% share of the MOCVD market overall and approximately 90% share in 200mm GaN epitaxial tools.

Every rack of 800V HVDC infrastructure increases GaN content per server, and each GaN device begins life as an MOCVD-deposited epitaxial stack. That is the operational lever behind the stock's move.

The Guidance Paradox: SiC Weakness, GaN Upside

The rally is striking because the company has simultaneously cut 2026 guidance. Aixtron now projects full-year 2026 revenue of €490 million to €550 million, down from €556.6 million in 2025 (itself a 12% year-over-year decline). Q1 2026 revenue is guided at approximately €65 million, a roughly 42% drop from €112.5 million in Q1 2025 and nearly 40% below the €111 million analyst consensus.

Management attributes the near-term weakness to persistent oversupply in the silicon carbide (SiC) equipment market, where EV-driven demand has failed to materialize at forecast levels. Investors are pricing through that trough and looking to the GaN-led second half and 2027 Kyber ramp.

Malaysia Expansion and Institutional Buying

In early April 2026, BlackRock — the world's largest asset manager — lifted its voting stake in Aixtron from 7.35% to 7.46%, a move interpreted by the market as an endorsement of the GaN thesis. The company itself is investing roughly €40 million in a new MOCVD tool assembly facility in Malaysia, slated for operational start in spring 2027 with initial customer deliveries in the second half of that year.

Aixtron's R&D intensity remains high at 14.57% of revenue, and its equity ratio of 88% with around €225 million of liquid funds gives the company balance sheet room to sustain investment through the current SiC trough.

What This Means for Plasma Processing and Thin Film Deposition

The Aixtron tape is a cleaner signal than most for the state of specialty thin film deposition. It confirms that compound-semiconductor epitaxy — GaN and SiC grown via MOCVD — has joined silicon logic and DRAM as an AI-coupled equipment market. The 800V HVDC architecture mandates wide-bandgap power devices, and those devices cannot be built without precision MOCVD deposition of GaN/AlGaN/InGaN stacks on sapphire, silicon, or SiC substrates.

For the broader deposition supply chain, the read-through extends well beyond MOCVD. Every GaN power device requires companion processes: plasma-enhanced chemical vapor deposition (PECVD) for passivation layers, atomic layer deposition (ALD) for high-k gate dielectrics on GaN HEMTs, sputtering (PVD) for ohmic and Schottky contact metals, and inductively-coupled plasma (ICP) etch for mesa isolation and gate recess. A doubling of GaN wafer starts for AI data-center power pulls the full plasma-and-deposition toolchain with it.

The divergence between Aixtron's SiC weakness and GaN strength is also instructive for equipment buyers. SiC oversupply is forcing capital-equipment spending to reprice, while GaN-for-AI is absorbing every incremental tool slot. Suppliers of plasma sources, process gas delivery, vacuum hardware, RF generators, and in-situ process monitoring tied to MOCVD, PECVD, and plasma etch should expect mix-shift pressure toward GaN process flows through 2026 and into the Nvidia Kyber ramp in 2027.