TL;DR · 30-second read
The Short Version
The fastest connections inside artificial intelligence data centers carry data as pulses of light. Many of the tiny lasers that make that light are built on thin discs of a crystal called indium phosphide, and AXT, a California company, makes those discs.
AXT’s sales from July to September were more than two and a half times what they were a year earlier: $73.4 million. It says buyers want more than it can make.
Its factories are in China. Its plan to make more, backed by up to $545 million from outside investors, needs Chinese government sign-off, and its overseas shipments need Chinese export permits.
AXT, Inc. (Nasdaq: AXTI), a Fremont, California maker of compound semiconductor wafer substrates, reported record third-quarter 2026 revenue of $73.4 million on October 29. Revenue was up 54% from the prior quarter and 162% from a year earlier. The company attributed the gain to exceptionally strong demand for its indium phosphide wafers, which are used in the optical links that connect AI data center hardware. GuruFocus reported that the quarter also came with a key supply deal.
One day earlier, on October 28, AXT announced that its majority-owned Chinese subsidiary, Beijing Tongmei Xtal Technology, had signed definitive agreements for a private equity investment of at least RMB 1.91 billion (about $285 million) and up to RMB 3.67 billion (about $545 million). The money is to fund indium phosphide capacity expansion. Closing is expected in December 2026, subject to filings with government authorities.
Executive Summary
AXT’s quarter has two parts: a revenue jump and a plan to fund the capacity to sustain it. In its October 29 results release, the company reported $73.4 million in revenue. Chief executive Morris Young said AXT had surpassed its goal of doubling indium phosphide capacity in 2026. Young also said AXT had more than quadrupled its 2026 indium phosphide revenue opportunity through productivity gains and the ability to make larger-diameter wafers.
The financing is where the next stage of growth gets decided. An 8-K filed October 28 sets out the Tongmei agreements. Institutional investors would put in between $285 million and $545 million, and AXT would recapitalize Tongmei by subscribing for shares worth the renminbi equivalent of $400 million. AXT would keep about 73.40% of Tongmei if the maximum is raised.
The deal matters beyond AXT because indium phosphide substrates are the base layer for many lasers and detectors in AI optical networking. A company at that layer is saying demand outpaces supply. That suggests at least part of the AI optics constraint sits at the raw-wafer stage, and adding supply at that stage depends on regulatory steps in China.
The Squeeze Has Reached the Wafer
AI clusters are wired together with optical transceivers. These are modules that turn electrical signals into light for transmission over fiber and back again. Many of the lasers and photodetectors inside them are grown on indium phosphide substrates. A substrate is the polished crystal disc on which a chipmaker builds its devices. Discussion of AI optics supply usually focuses on transceiver assemblers and laser fabs. AXT’s results point one step further upstream, to the wafer those lasers start on.
The numbers make the case. Revenue of $73.4 million, up 54% in a single quarter and 162% year over year, implies roughly $48 million in the second quarter and roughly $28 million a year earlier. AXT attributes the increase to its indium phosphide business. The more telling detail is the order of events. AXT says it has already more than doubled indium phosphide capacity this year, yet on October 28 Young said demand for these wafers is “outpacing supply.” A supplier that has exceeded its capacity target and still describes a shortfall is describing a real constraint at its layer of the chain.
The companies most exposed are laser and transceiver makers, and through them the data center operators buying optical networking at scale. Supply problems at assembly can often be worked around by adding lines or contractors. Substrate supply is harder to replace quickly, because a laser line typically has to qualify a wafer source before using it. AXT’s own capacity lever helps explain the pressure. Larger-diameter wafers yield more devices per disc, and AXT names that capability as one of the two reasons its revenue opportunity quadrupled.
Why Relief Runs Through China
AXT is headquartered in Fremont, but it manufactures in three locations in China. It also holds stakes in more than ten Chinese companies that supply its raw materials and consumables. The expansion is being funded at the subsidiary level: Tongmei is issuing its own shares, which Young said provides renminbi directly into its operations. Young added that proceeds will also expand capacity at AXT’s raw material companies in China.
That structure puts two regulatory steps between today’s shortfall and tomorrow’s wafers. The first governs the money coming in. Under the 8-K, closing of the minimum investment requires required filings from government authorities. The share subscription agreement terminates if that closing has not occurred by December 20, 2026, though the parties agreed to reasonably consider an extension if approvals are pending. The second governs the wafers going out. AXT’s forward-looking statements in both releases list the receipt of export permits for its indium phosphide substrates as a risk, along with PRC registrations and geopolitical tensions between China and the United States.
AXT discloses these conditions plainly, and they are standard for a China-based manufacturer. For downstream buyers, the practical point is that substrate capacity planning now includes a policy variable alongside the engineering ones. New furnaces add supply only if the funding closes and the permits keep pace.
What the Tongmei Terms Signal
The financing is large relative to the business it funds. At its $545 million maximum, the outside investment alone is more than seven times AXT’s record quarterly revenue. AXT would also subscribe for 342,998,797 Tongmei shares for the renminbi equivalent of $400 million. The lead investor, BNK-B3 HK Holdings, is managed by what AXT calls a leading Asia asset manager. It would nominate one of Tongmei’s nine directors, and AXT would nominate the other eight.
Investors receive meaningful protections in return. The filing describes a liquidation preference, preemptive rights on future issuance, consent rights over certain transactions, and a Redemption Support Agreement. AXT names the exercise of redemption rights as a risk factor. The parties have also committed to pursue a qualified IPO of Tongmei “as soon as possible” after closing, and Young said the lead investor is committed to helping Tongmei achieve an overseas listing. In practice, AXT is funding capacity in local currency now, and part of the cost is investor priority that depends on a listing happening later.
One detail stands out. The investors include an institutional investor that is an affiliate of an existing AXT customer. AXT has not named the customer or linked the investment to volumes. Still, a buyer’s affiliate putting equity behind a supplier’s capacity fits the scarcity Young describes.
What Is Reported, and What Is Projected
Several facts are firm. The record revenue and growth rates appear in a results release furnished to the SEC, and the Tongmei agreements are signed and definitive, with stated minimum and maximum amounts. Other claims are management characterizations. The “more than quadrupled” revenue opportunity describes what capacity could support, not booked sales. “Transformational growth” is a forward-looking expectation. AXT’s own filing states that no assurance can be given that any closing will occur or that the maximum will be invested.
That distinction matters for anyone sizing AI optics supply off this report. The demand signal is backed by reported revenue. The supply response is real in intent and funded on paper, but it has not yet cleared the steps that would turn it into wafers.
Background
AXT, Inc. is a materials science company that makes compound and single-element semiconductor wafer substrates in indium phosphide, gallium arsenide and germanium. These substrates are used when ordinary silicon cannot meet a device’s performance requirements. Its end markets include AI and data center connectivity, including silicon photonics (chips that route data as light), 5G infrastructure, passive optical networks, LED lighting, lasers, sensors, wireless power amplifiers and satellite solar cells.
The company is headquartered in Fremont, California, where it handles sales, administration and customer service. It has an Asia headquarters in Beijing and manufacturing facilities in three locations in China, run through its majority-owned subsidiary Tongmei. As part of its supply chain strategy, AXT holds partial ownership in more than ten Chinese companies that produce raw materials and consumables for its manufacturing. Source: AXTI Q3 Earnings Call Highlights AI Demand and Capacity Expansion (TradingView), coverage of AXT’s third-quarter 2026 earnings call. See also GuruFocus: AXT Inc (AXTI) Reports Strong Q3 2026 Results with $73.4M Revenue and Secures Key Supply Deal. Primary sources: AXT, Inc. Form 8-K filed October 29, 2026; Exhibit 99.1: AXT, Inc. Announces Third Quarter 2026 Financial Results; AXT, Inc. Form 8-K filed October 28, 2026 (Tongmei Share Subscription Agreement); Exhibit 99.1: AXT, Inc. Announces Up to RMB 3.67 Billion (Approximately US$545 Million) in Private Equity Financing for Subsidiary Tongmei.Sources