Arista Networks (NYSE:ANET) posted its first $3 billion-plus quarter on August 4, and the market noticed immediately. Shares spiked as much as 12.8% the next day on August 5 before settling to a 4.7% gain by midday. Revenue reached $3.036 billion, up 37.7% from a year earlier and 12.1% above the first quarter, while non-GAAP earnings per share climbed to $1.02, a 40% jump. For a stock already riding the AI data center buildout, this was the quarter that turned momentum into proof.
Bull Case: Growth That Keeps Getting Faster
What stood out wasn’t just the beat; it was the trajectory. Arista’s year-over-year growth accelerated from roughly 35% in the first quarter of 2026 to 37.7% in the second, meaning growth is stacking on growth rather than fading. That builds on a full 2025 in which revenue rose 28.6% to $9.0 billion. Analysts had modeled second quarter revenue of $2.83 billion and adjusted EPS of $0.89, so the actual results cleared both comfortably. Profitability moved in the same direction, with non-GAAP operating margin expanding to 49.9% from 48.8% a year earlier and GAAP operating margin rising to 45.4% from 44.7%, even as the company scaled manufacturing to meet demand.
Management didn’t just clear this quarter; it raised the bar ahead. Full-year revenue guidance moved up to about $12.6 billion, roughly 40% growth, and third quarter guidance of approximately $3.3 billion in revenue and non-GAAP EPS of $1.06 to $1.08 came in well above the Street’s prior estimates of $2.95 billion and $0.92. The company also kept its target of at least $3.5 billion in AI fabrics revenue for the year and said its Etherlink AI platforms have now passed 100 cumulative customers. New hardware backs that up: the 7060XE7 Series brings 1.6 terabit AI fabric platforms with liquid-cooled options and up to 100 Tbps of system bandwidth, cutting interconnect power consumption by about 60% versus older optics.
Bear Case: Cracks Beneath A Clean Beat
Not every line in the report moved in the right direction. Non-GAAP gross margin slipped to 63.4% from 65.6% a year ago, and GAAP gross margin fell to 62.9% from 65.2%, with management pointing to higher component costs tied to the manufacturing capacity it’s adding to keep pace with orders. Operating margin still expanded, which shows the company absorbed that pressure lower down the income statement, but a two-point gross margin decline during a demand boom raises the question of how much pricing power is left to give.
Customer concentration is the other issue worth watching. Microsoft accounted for 26% of Arista’s 2025 revenue and Meta Platforms another 16%, meaning two customers made up 42% of the business, while the company’s broader Cloud and AI Titans group represented about 48%. That kind of dependence means a budget shift at either hyperscaler could show up in results quickly. Layered on top is a valuation that already assumes the good times continue, with the stock trading at a level that effectively asks investors to pay today for growth the company hasn’t delivered yet.
Where Street Stands Right Now
Hedge fund ownership slipped to 85 funds from 91 the prior quarter, a modest pullback even as the stock rallied. Short interest is thin at just 1.91% of float, showing little organized bearishness against the name. Arista trades at a forward P/E of 46.08 as of August 10, a multiple that leaves no room for a growth stumble and prices in continued acceleration rather than just steady execution.
The Trade-Off Investors Now Face
Arista just proved the AI networking buildout is still accelerating, not slowing, with faster growth, margin resilience where it counts, and a raised outlook to back it up. For the bulls, that trend needs to keep holding as gross margin pressure and customer concentration test the story over the next few quarters.
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