What happened
Arista Networks reported second-quarter revenue of $3.036 billion, up 37.7% year over year, with non-GAAP earnings per share climbing about 40% to $1.02. The company raised full-year revenue guidance to about $12.6 billion, implying roughly 40% growth, and said its Etherlink AI platforms have passed 100 cumulative customers.
Why it matters
Arista sells the high-speed switches and routing platforms that move data inside AI data centers, making it one of the purest ways to invest in AI networking. The milestone quarter signals strong underlying demand from hyperscale cloud providers—though two customers, Microsoft (26% of 2025 revenue) and Meta Platforms (16%), account for 42% of the business, concentrating risk in a handful of buyer relationships.
What to watch
Non-GAAP gross margin fell to 63.4% in the quarter from 65.6% a year ago, driven by higher component costs as the company adds manufacturing capacity. At Tuesday's close the stock traded near a 60 price-to-earnings ratio (about 42 forward); pre-market trading Wednesday pointed above the prior 52-week high of $194.35.
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Arista's $3 billion quarter marks an inflection point not just for the company but for the AI networking segment as a whole. The acceleration—from 35% year-over-year growth in Q1 2026 to 37.7% in Q2, on top of 28.6% growth across all of 2025—reflects sustained, heavy investment in AI infrastructure by the world's largest cloud providers. The company's raised full-year guidance to roughly 40% growth and its disclosure that Etherlink AI platforms have passed 100 cumulative customers both signal that the demand cycle has runway remaining through at least 2026.
However, two structural features of the business deserve scrutiny. First, gross margin compression during a demand boom is unusual and potentially concerning. Management attributes it to higher component costs tied to capacity expansion, but in a high-growth phase when pricing power should be at its peak, a two-percentage-point slide warrants close monitoring. Second, customer concentration—with Microsoft and Meta Platforms together accounting for 42% of revenue—creates dependency on the budgeting decisions of two buyers. A slowdown or reallocation of spend at either company could ripple through Arista's results faster than the broader market might anticipate.
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