Arista Stock Jumps After Hours: Revenue Surges 58% to $3.66 Billion

Arista Networks stock jumped in after-hours trading on Tuesday, November 3, 2026, after the AI networking company reported third-quarter revenue of $3.66 billion, up 58.5% from a year earlier — its fastest year-over-year growth since its IPO. Adjusted earnings were $1.20 a share, and Arista guided fourth-quarter revenue to $3.9 billion to $4.0 billion, well above what analysts had expected.

What happened

Arista reported results for the quarter ended September 30 after the market close on Tuesday. Revenue reached $3.66 billion, up from $2.31 billion a year earlier and up 20.5% from the second quarter. That easily beat both the company's own guidance of about $3.3 billion and analyst expectations of roughly $3.33 billion to $3.34 billion.

Earnings also came in ahead of forecasts. Non-GAAP earnings were $1.20 a share, compared with expectations of about $1.08 to $1.10 a share and the company's own guide of $1.06 to $1.08. On a reported GAAP basis, earnings were $1.22 a share, up from $0.67 a share a year earlier. Shares had closed the regular session at $169.91, up 3.52%, before the results landed.

Key facts

• Revenue: $3.66 billion in Q3, up 58.5% year over year and 20.5% from Q2.
• Adjusted EPS: $1.20 a share, versus about $1.08 expected; GAAP EPS was $1.22.
• Q4 guidance: Revenue of $3.9 billion to $4.0 billion, with a $3.95 billion midpoint versus estimates near $3.60 billion.
• Margins: Non-GAAP gross margin was 64.0%, down 1.2 points from a year earlier; non-GAAP operating margin reached 49.1%.
• Balance sheet: About $14.4 billion in cash and marketable securities at the end of September.
• Stock reaction: Shares rose in extended trading, with reports at different moments in the evening putting the gain at roughly 7% to 10%.

Why it is blowing up

Arista sells the high-speed networking gear that connects servers inside the world's largest cloud and AI data centers. When cloud operators spend heavily on artificial intelligence, they need far more networking capacity to link thousands of processors together — and Tuesday's numbers showed that demand is still accelerating, not cooling.

The size of the beat is what grabbed attention. Revenue came in roughly 10% above the company's own guidance, and chief executive Jayshree Ullal described the quarter as Arista's highest year-over-year revenue growth since its initial public offering in 2014, with record profitability. The result also landed on the heaviest earnings night of the quarter, alongside AMD and other AI-linked names, so it quickly became a test of whether the AI infrastructure trade still has momentum after the Nasdaq-100's recent fall into correction.

Context matters too. Arista shares had retreated from a 52-week high of $217.41 set on October 8 and fell sharply in late October during the broader AI sell-off. A beat this large, followed by guidance well above estimates, gave investors who had sold the stock a reason to reassess it the same evening.

The catch investors are watching

The report was not flawless. Gross margin slipped as the mix shifted toward product sales, which made up 87% of revenue and earn less than services. GAAP gross margin was 63.6%, down from 64.6%. Arista's reported profit also included a $134.5 million gain on strategic investments, which the company removes from its non-GAAP earnings.

The fourth-quarter guide, while well above analyst estimates, also implies slower sequential growth — roughly 7% to 9% more revenue than Q3, after a 20.5% jump this quarter. That is the tension in the story: demand is booming, but the growth rate is set to step down from an exceptional quarter, and margins are drifting lower as hardware dominates the mix.

What is next

Arista joined the S&P 100 in September, and it has previously forecast at least $3.5 billion of AI-related revenue in 2026. Investors will now watch whether the fourth quarter delivers the guided $3.9 billion to $4.0 billion, whether gross margin stabilizes, and what the company says next about demand from its largest cloud customers. This report describes what happened and why markets reacted; it is not a recommendation to buy, sell, or hold any security.

FAQ

Why did Arista stock jump after hours on November 3?

Arista beat expectations by a wide margin: Q3 revenue rose 58.5% to $3.66 billion and adjusted EPS reached $1.20, while Q4 revenue guidance of $3.9 billion to $4.0 billion came in well above estimates.

How fast is Arista growing?

Revenue grew 58.5% from a year earlier in Q3 — its highest year-over-year growth since its IPO, according to CEO Jayshree Ullal — and 20.5% from the previous quarter.

What did Arista guide for the fourth quarter?

Arista guided Q4 revenue to $3.9 billion to $4.0 billion. The $3.95 billion midpoint was well above analyst estimates near $3.60 billion, though it implies slower sequential growth than Q3.

What weighed on Arista's margins?

Gross margin slipped because product sales, which carry lower margins than services, made up 87% of revenue. Non-GAAP gross margin was 64.0%, down 1.2 points year over year.

Sources

The Motley Fool · MarketCatalyst · XTB · Seeking Alpha · Investor's Business Daily