Arista Networks (ANET)

Arista Networks data center thesis

Arista is the merchant-silicon switching standard for hyperscaler AI back-end fabrics: 400G today, 800G shipping, 1.6T in qualification, running EOS across Meta and Microsoft's east-west GPU traffic. Revenue scaled from $2.3B (2020) to $9.0B (2025) at a near-best-in-class 64% gross margin; operating income hit $3.86B. Stock is -18% on the week and +64% YoY because investors are stress-testing hyperscaler concentration after a soft commentary print.

Bull case

• Operating income compounded from $0.7B (2020) to $3.86B (2025) on stable 64% gross margins; Arista keeps software-style economics on hardware because EOS plus merchant silicon scales without proportional headcount.
• AI back-end fabrics need lossless, deterministic east-west bandwidth at GPU-cluster scale; Arista's Etherlink architecture is positioned as the open-Ethernet alternative to InfiniBand and ships in front of B200 cluster buildouts at hyperscaler customers.
• Each generation of GPU (H100 -> B200 -> B300) doubles east-west bandwidth needs and forces a 400G -> 800G -> 1.6T port refresh; Arista's R-series and 7800R4 win the high-end ports inside that compulsory upgrade cycle.

Bear case

• Hyperscaler concentration is the structural risk: Meta and Microsoft are >35% of revenue. Either pulling forward AI capex into 1H or shifting back-end traffic to NVIDIA InfiniBand or in-house silicon resets the multiple sharply.
• Cisco re-entered the merchant-silicon AI-fabric conversation with Silicon One and is bidding hyperscaler tenders aggressively; white-box (Celestica, Wiwynn) eats the long tail at price points Arista won't match.
• Stock at 60% of 52-week high after a -18% week; the 64% gross margin is the multiple. Any commentary suggesting price pressure or share loss in 800G qualification compresses the entire valuation framework.

Thesis last reviewed 2026-05-09.

Arista Networks revenue and capex

In fiscal 2025, Arista Networks reported revenue of $9.0B, capital spending of $119.5M and operating income of $3.9B.

From annual reports filed with the SEC; the most recent was filed 2026-02-17.

Tracked Arista Networks data center projects

• Meta Hyperion, 5 GW, Holly Ridge, LA · under construction
• OpenAI Stargate Abilene, 1.2 GW, Abilene, TX · operational
• Meta Prometheus, 1 GW, New Albany, OH · operational
• Azure Northern Virginia, 1 GW est., Northern Virginia, VA · operational
• Microsoft Fairwater Wisconsin, Mount Pleasant, WI · operational

Analysis mentioning Arista Networks

• Why Data Centers Are So Big: A Gigawatt Campus Costs $38 Billion, and the Land Is Under 1% of It, 2026-09-17
• The Hyperscaler Capex Supply Chain: Who stands to gain from this week's earnings reports, 2026-04-27

Other networking names tracked

• Applied Optoelectronics (AAOI)
• Ciena Corp (CIEN)
• Coherent Corp (COHR)
• Credo Technology (CRDO)
• Fabrinet (FN)
• Lumentum Holdings (LITE)