Astera Labs (ALAB) Q4 FY25 earnings call: guidance and Q&A

What is the visibility on UALink acceptance for next-gen designs, especially with the Amazon warrant, and how does it mix with custom connectivity like NVLink Fusion?

Management confirmed AWS and AMD public announcements supporting UALink for 2027 ramps. They noted the NVLink Fusion opportunity is also meaningful, with Astera Labs chosen as a partner by both Amazon and NVIDIA. The revenue opportunity for custom solutions like NVLink Fusion is anticipated to be similar to a UALink switch, as it attaches one-to-one per accelerator. The Amazon warrant agreement, for up to $6.5 billion in products, demonstrates a strong relationship.

“both Amazon, the hyperscaler as well as NVIDIA have chosen Astera as a partner. And that's a very important statement in terms of the trust that they place in the Astera Labs.”

asked by Blayne Curtis · answered by Jitendra Mohan

Why is OpEx increasing significantly, and how do UALink and ESUN technologies coexist in the scale-up networking market?

The OpEx increase is driven by significant revenue opportunities presented by customers, necessitating investments in R&D, including the aiXscale acquisition and a recent acquihire for the Israel Design Center. Management stated that scale-up networking is a large market where proprietary and standard approaches (PCIe, UALink, Ethernet, ESUN) will coexist. Hyperscalers will leverage solutions aligned with their software stacks, with Astera focusing on UALink based on customer requests.

“hyperscalers are going to leverage the type of solutions that their software stack is designed for.”

asked by Joseph Moore · answered by Michael Tate

Did Scorpio achieve the 20% of sales milestone in Q4, and how does Astera's content evolve with NVIDIA's Vera Rubin generation compared to Blackwell?

Scorpio exceeded 15% of full-year 2025 revenue, driven primarily by Scorpio P-Series. Scorpio X-Series will see a more material ramp in H2 2026. For NVIDIA's Vera Rubin, Astera's opportunity arises from custom deployments by hyperscalers, similar to Grace Blackwell. Management expects to be part of these custom solutions as designs transition to Vera Rubin, aiming for increased dollar content per XPU generation.

“As we have established now that the opportunity for Astera arises when our customers do custom deployments of the Grace Blackwell or in the future Vera Rubin reference design.”

asked by Vivek Arya · answered by Jitendra Mohan

Is the market shifting towards more platform-specific scale-up initiatives, and is this driving the OpEx increase?

Management confirmed a trend towards customization in scale-up topologies, where Astera's software-defined fabrics allow leveraging the same silicon for various custom needs. The significant OpEx increase is due to a 'tremendous influx of opportunities' and learnings from being in the scale-up domain, requiring investment now to support longer-term growth and market position. The Israel design center is part of this strategy.

“The thing that we are seeing is a tremendous influx of opportunities. And that's largely coming from the fact that we have spent about 12 to 15 months, sort of being in the scale-up domain, and we have learned a lot.”

asked by Tore Svanberg · answered by Sanjay Gajendra

What is the time to revenue for the increased OpEx investments, and is Scorpio still expected to become the largest product line this year?

Management indicated that new opportunities can turn into silicon and revenue in 18-24 months, with optical being a longer-term investment. They emphasized building internal capabilities for optical. Scorpio P-Series exceeded 15% of 2025 sales. With Scorpio X-Series ramping materially in H2 2026, the combination of P and X will put Scorpio on a trajectory to become the largest product line, though the exact crossover timing is uncertain as other product lines are also growing.

“you could see from start to revenues in 18, 24 months on the earlier side.”

asked by Ross Seymore · answered by Michael Tate

Can you provide more details on the Amazon warrant agreement, including its linearity, and clarify the financial arrangement for NVLink Fusion?

Management stated the Amazon warrant agreement, filed in an 8-K, demonstrates a strong relationship and is a follow-on to a previous agreement. Warrants are earned as revenue milestones (up to $6.5 billion) are achieved, resulting in a non-cash charge of ~2 points to gross margins per quarter starting Q2 FY26. They could not disclose specific financial arrangements for NVLink Fusion due to NDAs, but noted it opens new opportunities in the NVLink ecosystem, being additive to their existing business.

“It does demonstrate the strong relationship that we have with Amazon. This is a follow-on warrant. We've had a previous warrant agreement in place.”

asked by Sean O'Loughlin · answered by Michael Tate

What is driving the continued growth in Aries retimers, and what are the implications for Aries as the market transitions from copper to optical?

Aries growth is driven by its leadership in PCIe (Gen 4, 5, 6), increasing use in chip-down and smart cable applications, and its role in scale-up applications. Customers prefer copper for as long as possible, but a transition to optical will occur when reach or bandwidth limits copper. This transition will likely start with pluggable optics, moving to near-package and co-packaged optics, with co-packaged optics for scale-up expected around 2028. Copper and optical are expected to coexist.

“Most of our customers will continue to stay with copper for as long as they can. That has been their preference all this time.”

asked by Srinivas Pajjuri · answered by Jitendra Mohan