Arista Networks AI demand broadens as supply caps 40% growth guide

Arista Networks said AI networking demand spans cloud providers, AI labs, neoclouds and campus buyers, while supply constraints cap its 40 percent revenue growth guide for fiscal 2026.

"We had this Etherlink portfolio June 2024, and I think it is just indicative of how we feel Arista was almost born for this AI moment," Chantelle Breithaupt, chief financial officer at Arista Networks, said at Rosenblatt's 6th Annual Technology Summit. "First, we had the cloud, and now we have AI."

The company's Etherlink portfolio, launched in June 2024 as an 800G Ethernet-only offering, has expanded to more than 100 customers. Arista raised full-year 2026 revenue guidance to $12.6 billion, implying 40 percent annual growth, with at least $3.5 billion targeted from AI Fabrics. Q2 2026 revenue reached $3.036 billion, up 37.7 percent year over year, with non-GAAP EPS of $1.02 beating the $0.89 consensus.

Arista shares closed at $192.74 on Aug. 18, down 4.49 percent, giving the company a market capitalization of $243.08 billion. The stock trades at roughly 60 times trailing earnings, with analysts maintaining a consensus Buy rating and a $226.05 average price target.

Supply Constraints Cap Upside to 40% Guide

Breithaupt said Arista does not view current demand as driven by customers placing orders early because of component shortages. Customer conversations and project timelines point to underlying demand for AI infrastructure, she said, noting that 52-week lead times make it unlikely customers would commit without confidence in their projects.

"We do not see pull forward at all," Breithaupt said. "If we get a bit more supply, we could even go a little higher than the guide."

Supply remains a limiting factor heading into next year, though Arista and its suppliers have made progress supporting the 40 percent revenue guide. The company described supply issues as "whack-a-mole" but manageable, with roughly two quarters of visibility for supply planning.

Scale-Across Is Already One-Third of the Business

Brendan Gibbs, vice president of product line management, said Arista's EOS network operating system remains central to its AI networking proposition, providing "speed with quality" that helps customers deploy AI clusters faster and gain analytics into GPU utilization. Scale-across — linking geographically distributed data centers — now represents roughly one-third of the business under recent guidance.

Arista is also investing in Ethernet-based scale-up networking, a market outside analysts estimate could reach $20 billion by 2030. The company is helping define the Ethernet Scale-Up Networking (ESAN) standard through the Open Compute Project. Breithaupt cautioned that scale-up will not be material to 2027 financial results, with the opportunity expected to become a new segment beginning in 2028.

The company is conducting 1.6T product trials with large customers and expects volume production next year, with both air-cooled and liquid-cooled options. Arista also introduced open co-packaged optics and XPO, a liquid-cooled, pluggable 1.6T optical technology that is generating customer discussions but not yet contributing to revenue.

On margins, Breithaupt said investors should assume a 62 percent to 64 percent gross-margin range unless the company provides different parameters. Price increases intended to offset higher component costs are designed to preserve margins rather than expand them. Outside AI data center networking, Arista targets a 5 percent market-share gain in campus networking, with campus revenue expected to rise from $800 million last year to $1.25 billion under current guidance.

Arista's competitive position in scale-across benefits from its existing wins in large Ethernet-based scale-out AI clusters, Gibbs said. "Before you can take a data center and an AI deployment and scale it across, you actually need to win first that back end scale-out cluster," he said. "Arista is one of the most successful vendors in deploying large scale multi-customer back end training clusters, period."

The company faces competition from Cisco Systems, which has been expanding its AI networking portfolio, and from Nvidia's proprietary NVLink interconnect in the scale-up domain. Arista does not intend to enter the white-box business, Breithaupt said, but sees opportunity for customers that value a consistent EOS-based operating environment across scale-up, scale-out and scale-across deployments.

For investors, the key question is whether Arista can sustain near-40 percent revenue growth as hyperscale data-center customers and AI-focused deployments move from early build-outs into broader demand cycles. The stock's forward multiple of roughly 50 times projected fiscal 2026 EPS of $3.70 reflects expectations that AI networking will remain a multi-year growth driver. With supply constraints potentially easing into 2027 and scale-up expected to become a new revenue segment in 2028, Arista's growth runway extends beyond the current fiscal year — but execution against the $12.6 billion guide remains the near-term test.

This article is for informational purposes only and does not constitute investment advice.