AXTI vs. ASYS: Which AI Semiconductor Stock Is the Better Buy Now?

AXT, Inc. AXTI develops high-performance compound semiconductor wafer substrates, including indium phosphide, gallium arsenide and germanium, used in optical connectivity, lasers and other applications. Amtech Systems ASYS provides equipment, consumables and services for semiconductor packaging, wafer production and device fabrication, including technologies supporting AI GPUs and silicon-carbide power devices.

Both companies operate within the semiconductor supply chain and stand to benefit from rising demand for AI infrastructure, advanced packaging, high-speed optical connectivity and next-generation semiconductor technologies. Their exposure to these secular trends makes them relevant to investors seeking AI-related opportunities beyond chipmakers.

The AI boom is creating substantial opportunities across the semiconductor supply chain, potentially benefiting AXTI and ASYS. But which stock is better positioned to capitalize on these trends and deliver sustainable growth? Let’s dive deep.

The Case for AXTI Stock

AXTI is emerging as a key semiconductor supply-chain beneficiary of AI data-center expansion, particularly through its indium phosphide (InP) wafer substrates used in high-speed optical connectivity. The company does not manufacture chips; instead, it supplies specialty substrates that enable optoelectronic devices where silicon cannot meet performance requirements.

AXTI’s strengths and AI opportunity are evident in its financial performance and customer demand. The second quarter of 2026 marked a major inflection point. Revenues reached a record $47.6 million, up 164% year over year, while InP revenues hit a record $30.7 million, primarily from data-center applications. Importantly, AXT returned to profitability, reporting $11.1 million of GAAP net income, compared with $7 million year over year. AI-driven migration toward 800G and 1.6T optical transceivers, followed by near-packaged and co-packaged optics, provides a potentially durable, multiyear demand opportunity.

AXT's competitive advantages include a high technical barrier to entry, rapidly expanding capacity, improving manufacturing productivity and a vertically integrated raw-material supply chain. Its backlog exceeded $100 million, with coverage extending into 2027. AXT is also advancing 6-inch InP substrates and plans to double InP capacity again in 2027, which could support further growth as customers migrate toward larger, higher-value substrates.

AXT has recently deepened relationships with key optical-component customers supporting AI data-center connectivity. It has secured supply agreements with Casela and Coherent and a long-term capacity reservation agreement with Lumentum. These agreements provide greater revenue visibility, validate strong customer demand and support AXT’s capacity expansion.

Yet, investors should monitor China export permits, U.S.-China trade restrictions, manufacturing execution and the pace at which AXT converts strong demand and capacity investments into sustainable revenue and margins.

The Case for ASYS Stock

Amtech Systems is increasingly establishing itself as a manufacturer of AI semiconductor equipment, and its Thermal Processing Solutions (TPS) business is benefiting from the growing demand for advanced packaging and AI server-board assembly. Its differentiated TrueFlat technology and industry-leading temperature uniformity support high-yield, repeatable processes for increasingly complex AI architectures.

Growth and financial momentum remain encouraging. Its third-quarter fiscal 2026 revenues rose 14.5% year over year to $22.4 million, while TPS revenues jumped 24.9% to $17.7 million. AI-related revenues within TPS increased approximately 120% and accounted for more than 40% of segment sales. TPS bookings surged 73% year over year to $24.3 million, while the segment's book-to-bill ratio reached 1.37, signaling demand ahead of current shipments. Total backlog rose 35% to $28.7 million. Gross margin improved to 50%, GAAP net income reached $1.7 million and adjusted EBITDA was $3.3 million.

The growth opportunity is also broadening beyond advanced packaging. ASYS received its first order for equipment used to produce cooling components for AI semiconductors, potentially expanding its addressable market within AI infrastructure. The company is also developing new equipment platforms for emerging semiconductor applications and higher-density packaging requirements, with new products planned for introduction at SEMICON Taiwan.

The key risk remains the continued weakness in its Semiconductor Fabrication Solutions (SFS) business. SFS revenues declined 13.3% year over year to $4.6 million, primarily because of weak demand for SiC-related products, and management does not expect a meaningful recovery. Meanwhile, reliance on a limited number of customers remains a concern, with two customers accounting for 45% of backlog at June 30, 2026.

AXTI vs. ASYS: Price Performance and Valuation

Over the past year, AXTI shares have soared 2,492.9%, significantly outperforming Amtech Systems’ 142.6% surge. AXT’s strong outperformance reflects growing investor confidence in its exposure to the AI-driven optical networking boom, alongside its aggressive InP capacity expansion and multi-year supply agreements with key industry players.

AXTI vs. ASYS: 1-Year Price Return Performance

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Valuation-wise, AXTI is currently trading at a premium, as suggested by the Value Score of F. In terms of the forward 12-month Price/Sales ratio, AXTI shares are trading at 12.99X, higher than ASYS’ 2.2X, although ASYS also carries a premium valuation, reflected in its Value Score D.

AXTI’s stretched valuation is supported by its strong long-term growth prospects, including accelerating AI-driven demand for InP substrates, a supply-constrained market with high technical barriers to entry, aggressive capacity expansion and growing adoption of larger, higher-value wafers. Its vertically integrated raw-material supply chain and improving manufacturing efficiency further strengthen its competitive position.

AXTI Vs. ASYS: Forward 12-Month P/S Ratio

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AXT Leads Amtech Systems in Earnings Growth Outlook

AXT appears better positioned than Amtech Systems based on the current earnings outlook. The Zacks Consensus Estimate for AXTI’s 2026 earnings is pegged at 86 cents per share, rising to $2.20 for 2027. Notably, these estimates have surged 218.5% and 209.9%, respectively, over the past 30 days.

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By comparison, Amtech Systems’ consensus earnings estimates are lower at 41 cents per share for 2026 and $1.25 for 2027. Over the past 30 days, these estimates have increased 28.1% and 56.3%, respectively, indicating a comparatively more moderate upward revision trend than AXT’s.

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Conclusion

AXTI appears better positioned than ASYS right now, supported by stronger AI-driven growth, surging earnings estimates, robust InP demand, expanding capacity and significant customer commitments. ASYS also has promising AI opportunities, but its weaker SFS business and more modest earnings revisions limit its growth profile. Despite its premium valuation, AXTI’s stronger growth momentum makes it the better investment option right now.

Currently, AXTI sports a Zacks Rank #1 (Strong Buy), while ASYS carries a Zacks Rank #2 (Buy). You can see the complete list of today’s Zacks #1 Rank stocks here.

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This article originally published on Zacks Investment Research (zacks.com).

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