AXT is the upstream chokepoint of the photonics buildout, supplying the indium phosphide substrates every high-speed laser needs amid a massive global shortage. About 600,000-700,000 wafers shipped in 2025 against demand of 1.5-2 million, and AXT holds roughly 36% of a market three firms control. Record revenue rose 164% to $47.6M and gross margin hit 45% from 8.2%; Lumentum prepaid $87M to reserve capacity through 2031. The real risk is China, where slow export permits caused a guidance miss. … Show more

InP substrate demand and pricing still support the AI optics supply chain. Yunnan Germanium reports higher InP volumes from AI data centers and optical communications, plus higher prices. Q3 revenue rose 134.6% year on year, near AXT's guided 136%, but also includes germanium. IQE's H1 photonics grew 45%, partly from US defense funding. AXT's $66m Q3 guide covers only licensed exports or sales needing no license; a miss would more likely reflect licensing. x.com 

AXT's permit-backed Q4 outlook weakens the near-term operating objection to the Sell case. Q3 revenue reached $73.4M at 56% GAAP gross margin; management guides to about $90M in Q4 from business permitted or not needing permits. InP contributed $54.3M and backlog exceeds $500M, though much spans years. The remaining test is whether 2027 capacity becomes qualified, permitted shipments at durable margins. x.com  x.com  x.com 

AXT's indium phosphide substrate chokepoint gives it pricing potential, though its Coherent agreement caps annual wafer-price increases. Channel checks suggest increases of 50-60% in Q2 2026, 10% in Q3 and over 10% in Q4. With supply agreements to Lumentum and Coherent, AXT probably becomes No. 1 ahead of Sumitomo Electric. A SanDisk-style hike now looks less likely because of the annual cap, whose percentage is redacted. x.com 

AXT's Q2 2026 results confirm its role as an upstream indium phosphide supplier to AI optical modules. Revenue rose 164% year on year to $47.6 million, well above $30.4-34.1 million consensus, with GAAP net income of $11.1 million and adjusted EPS of $0.19 versus $0.07 expected. Lumentum signed an InP substrate capacity reservation through 2031 with $87 million of prepayments. InP revenue hit a record and backlog topped $100 million as data-center links move to 800G and 1.6T. x.com 

AXT's upside looks capped because its valuation already prices in a near-flawless indium phosphide capacity ramp. Doubling its ~25k wafers a year by end-2026 and again by end-2027 gives ~100k, about 4x, likely with some multiple compression. Even with ~58% growth to 2028, 60% gross-profit growth after and a 20x EV/GP multiple, EV reaches only ~$6.9B in five years versus $6.1B now. Only surprise capacity beyond 2027 changes the math; Soitec, at 19x EV/GP, is the better play. x.com  x.com 

AXT makes the substrates underneath the AI optical stack, InP, GaAs and germanium, and the market is finally noticing. InP feeds the lasers in 800G and 1.6T transceivers: no InP, no high-speed optics. Only a handful of companies produce these wafers at scale, and as hyperscalers race to upgrade AI networks, the materials layer is getting tight. Sitting at the overlooked bottom of the stack, it could be a 10x play. x.com 

AXT makes the indium phosphide substrates needed for high-speed data center connectivity, making it an AI infrastructure and optical connectivity play. EPS is expected to grow from $0.86 in 2026 to $3.29 by 2028, nearly 4x in two years. The chart is building the right side of a cup base. x.com 

Lumentum and Coherent are investments driven by product iteration, while AXT is a bottleneck trade best treated as speculation. Shortage-driven price hikes on the same parts define a cyclical stock, prices quickly discount shortage expectations, and once profits truly climb it is time to exit. Bottlenecks also push customers to design around them and invite new entrants. Investable companies keep lifting margins through yield gains and new products, driving token deflation while growing revenue. … Show more

AXT holds a critical-materials monopoly hiding in plain sight, because AI needs fiber, fiber needs lasers and lasers need indium phosphide. The stock is volatile. x.com