Citi maintains a Buy rating on Astera Labs with a US$200 target price, believing CPO and competition concerns are already largely reflected in the share price

Overview

This is a Citi company research and rating update on Astera Labs, Inc (ALAB.O). The core conclusion is that, despite rising concerns around CPO and competition, ALAB's main growth thesis remains intact: the company is expanding from AI server PCIe retimers into Scorpio PCIe fabric switches, CXL, AEC, and optical products, and is still positioned along the main trend of rising scale-up connectivity demand in AI data centers.

Core views

Citi believes ALAB is an important beneficiary of AI deployment. Scorpio is expected to ramp significantly in CY2026E, with sales likely exceeding US$600M and rising about 4x versus CY2025; Aries retimers still have a strong share base; and Cosmos software strengthens customer stickiness through telemetry, temperature, and electrical-signal sensing capabilities. The report also acknowledges that retimer share will decline as competition enters, but argues that ALAB's advantages in PCIe technology, software mix, first-mover advantage, and installed customer base are sufficient to support above-peer growth and valuation.

Analysis framework

The report uses a bottom-up product model to break out Aries AI retimer and Scorpio sales opportunities, and combines assumptions on AI accelerator shipments, retimer-to-GPU ratios, Scorpio P and Scorpio X mix, ASPs, share changes, gross margin, and EPS forecasts to revise revenue and earnings. On valuation, Citi bases its target price on approximately US$6 of EPS power in CY2028, applies a 40x forward P/E, and discounts back to a US$200 target price.

Methodology notes

• Earnings ForecastCiti AI Retimer Bottoms Up Model

  Bottom-up AI retimer model

  The model uses assumptions for the number of AI accelerators, the merchant GPU mix, NVDA share, the retimer-to-AI-accelerator ratio, ALAB share, and ASP to estimate Aries-related AI retimer sales.

• Product Revenue ForecastCiti Scorpio Sales Model

  Scorpio P and Scorpio X unit and ASP model

  The model assumes a roughly 1:1 Scorpio P-to-GPU ratio and a roughly 1:6 Scorpio X-to-XPU ratio, and uses an approximately US$300 Scorpio P ASP and about US$1,000 Scorpio X ASP to estimate sales.

• Valuation methodsForward P/E Valuation

  Forward P/E valuation

  Citi sets its target price based on roughly US$6 of CY2028 EPS power, a 40x P/E, and discounting; the reduction from the prior 50x P/E mainly reflects AI valuation re-rating.

Asset mapping & comparison

Structured mapping from thesis to named assets (strengths, weaknesses, peers, risks).

• ALAB.O

  Core coverage name

  Strengths

  High installed base of PCIe retimers in AI servers, Scorpio product expansion, Cosmos software differentiation, first-mover advantage in PCIe Gen5/Gen6, and direct exposure to NVDA and cloud providers' AI deployments.

  Weaknesses

  Valuation remains higher than some peers, retimer share is expected to decline from near 100%, and customer concentration and product ramp timing remain uncertain.

  Comparison

  The report says ALAB's roughly 40x forward P/E sits near the 30x-40x range of AI peers, while its roughly 40%+ EPS CAGR over the next three years is higher than the network-equipment peer average, so the higher P/E is somewhat justified on a PEG basis.

  Risks

  Key risks include share loss from larger competitors such as Broadcom and Marvell, customer concentration at Nvidia and AWS, new product launch risk, gross margin mix coming in below expectations, and substitution of some retimer demand by CPO.

• NVDA

  Key ecosystem and demand driver

  Strengths

  NVDA holds more than 90% share of merchant AI GPUs, and platforms such as Blackwell, GB300, and Vera-Rubin are driving demand for AI server connectivity.

  Weaknesses

  Changes in merchant reference designs could reduce some retimer or PCIe switching content, and the degree of customer customization affects the per-server value ALAB can capture.

  Comparison

  ALAB does not compete directly with NVDA; instead, it captures connectivity-chip opportunities from AI GPU and rack customization demand.

  Risks

  If NVDA customer customization is weaker than expected, or if reference designs include less external PCIe connectivity content, ALAB-related revenue could come in below model assumptions.

• AMZN

  Important customer lead for Scorpio P and Scorpio X

  Strengths

  The report notes that Scorpio P is linked to AMZN's NVDA-based server customization projects, while Scorpio X is supported by next-generation chip deployments.

  Weaknesses

  The business depends on the timing of a small number of very large customer projects.

  Comparison

  AMZN-related ASIC and Trainium platforms are viewed as an important source of demand for Scorpio P and PCIe AEC.

  Risks

  If project pull-ins, qualification, or production ramps are delayed, Scorpio revenue ramp-up will be affected.

Key data

• RatingBuyCiti maintained a Buy rating and transferred coverage.
• Target PriceUS$200.00Target price was cut, with the valuation multiple reduced from the prior 50x to a 40x forward P/E.
• Current PriceUS$106.33Price as of 2026-04-01 16:00.
• Expected Share-Price Return88.1%Expected dividend yield is 0.0%, and expected total return is also 88.1%.
• Market CapUS$18,099MMarket capitalization disclosed in the report.
• CY2026E/CY2027E/CY2028E Sales Forecast Revision+13%/+25%/+15%Driven by higher assumptions for Scorpio, Aries, and AI connectivity demand.
• FY2026E/FY2027E/FY2028E EPS ForecastUS$2.95/US$4.64/US$5.93Represents an increase of 19%/33%/15% versus prior estimates.
• Long-Term Gross Margin AssumptionAbout 70%-73%The report expects mix shifts to gradually pull non-GAAP gross margin toward about 70%, although Scorpio may provide some support.
• AI Retimer Share Assumption97%/80% in C2025/C2026EThe model assumes share declines after competitive entry, but still retains a majority market share.
• Scorpio Sales GrowthCY2026E sales of US$600M+, about 4x growthScorpio is expected to become the largest sales contributor in CY2026E, representing about 44% of sales.

Impact & implications

The report is mildly positive for ALAB: although the lower target price reflects the changed valuation environment, the higher earnings forecasts and strong expected return indicate that Citi believes concerns about CPO substitution, competition, and valuation pressure are already largely priced in. If Scorpio X, Scorpio P, optical engines, and UALink-related opportunities materialize as expected, ALAB's revenue mix will shift from a single-retimer driver toward a multi-product AI connectivity platform.

Risks

• Large competitors such as Broadcom and Marvell entering retimer, PCIe switch, UALink, or custom connectivity solutions could reduce ALAB's share.
• Customer concentration is high at Nvidia and AWS, so customer customization timing or procurement changes could affect revenue visibility.
• Scorpio X, Scorpio P, optical products, and UALink-related products carry design-in, qualification, and production-ramp risks.
• Changes in product mix could pull non-GAAP gross margin down from the low-70% range toward about 70%.
• CPO and optical interconnect could substitute for some copper connectivity and retimer demand, reducing the traditional retimer opportunity.
• Valuation remains elevated, and AI sector valuation re-rating could continue to pressure the target multiple.

What to watch

• The pace of high-volume production ramp for Scorpio X in the second half of 2026 through 2027.
• Deployment progress for the two additional Scorpio P customer programs in late 2026 and 2027.
• ALAB's share retention in PCIe Gen6 retimers and PCIe scale-up fabric.
• Whether CPO shows up as an incremental Scorpio opportunity or creates a stronger substitution effect against retimer and copper connectivity demand.
• Whether non-GAAP gross margin can stay in the 70%-73% range, and whether Scorpio can be margin accretive.
• Whether AI retimers, AEC, PCIe fabric switches, and optical products together can sustain high sales and earnings growth through 2028.