Arista Networks Q3 2026 Earnings: Revenue Rises 58.5%

Arista Networks (NYSE: ANET) reported Q3 2026 revenue of $3.66 billion, up 58.5% from $2.31 billion a year earlier, while GAAP diluted EPS rose to $1.22 from $0.67. Product revenue was the main growth engine, and operating leverage lifted GAAP operating margin even as gross margin narrowed. The quarter ended September 30, 2026.

Core Financial Results

Revenue increased by $1.35 billion year over year, with product sales accounting for most of the expansion. GAAP net income rose approximately 82.9% to $1.56 billion, helped by higher operating income and increased non-operating income.

Profitability was mixed at different levels of the income statement. GAAP gross margin declined by one percentage point, but GAAP operating margin expanded by 2.5 points because revenue grew faster than operating expenses.

Prior-period non-GAAP results were recast to reflect Arista’s revised methodology for calculating taxes associated with stock-based awards.

Business and Segment Performance

Product revenue increased approximately 66.9% and represented about 87% of quarterly revenue, making it the primary driver of companywide growth. Service revenue also increased, but at a substantially slower rate.

Management associated the broad customer momentum with Arista’s growing role in generative and agentic AI infrastructure, although the release did not quantify AI-related revenue. During the quarter, Arista introduced open Ethernet rack-scale architectures with partners including AMD, Arm, Broadcom, Meta, Microsoft and Qualcomm. The new portfolio supports both scale-up and scale-out AI networks, but the company did not attribute a specific amount of current-quarter revenue to these launches.

Product-Led Scale Expanded Operating Margin Despite Lower Gross Margin

Total operating expenses rose approximately 33.5% to $683.3 million, well below the 58.5% increase in revenue. Research and development expense increased approximately 49.4% to $486.9 million, while sales and marketing expense rose about 3.6% to $156.6 million. This expense leverage allowed GAAP operating margin to expand despite the lower gross margin; non-GAAP operating margin also edged up to 49.1% from 48.6%.

GAAP earnings received an additional benefit below the operating line. Other income increased to $273.1 million from $98.9 million, and GAAP net income included a $134.5 million gain on strategic investments that was excluded from non-GAAP results. This explains why GAAP diluted EPS of $1.22 was slightly higher than non-GAAP diluted EPS of $1.20 for the quarter.

Cash Flow and Balance Sheet

Cash-flow figures are for the nine months ended September 30, while balance-sheet comparisons are against December 31, 2025. Operating cash flow increased, but a much larger inventory build absorbed working capital.

Deferred revenue growth helped offset some of the working-capital pressure from inventory and receivables. Arista reported no share repurchases during the first nine months of 2026, compared with $983.0 million in the same period of 2025.

Q4 2026 Guidance

Arista expects sequential revenue growth in Q4, with the guidance range sitting approximately 6.6% to 9.4% above Q3 revenue. However, the projected non-GAAP operating-margin range is 0.1 to 1.1 percentage points below the Q3 level, indicating modest potential margin normalization as revenue continues to expand.

The non-GAAP guidance excludes items including stock-based compensation, intangible-asset amortization, tax benefits associated with stock awards and potential non-recurring charges or benefits.

Recent Insider Transactions

Over the latest six-month period provided, insiders reported purchasing 522,892 shares across 25 transactions and selling 6,109,440 shares across 37 transactions, resulting in net sales of 5,586,548 shares. The latest 10 reported transactions included eight sales and two derivative-security exercises; the exercises should not be interpreted as open-market purchases.

The transaction records establish the timing and size of the activity but do not disclose the insiders’ reasons for selling.

Risks Investors Need to Watch

• Gross-margin pressure: GAAP and non-GAAP gross margins declined by 1.0 and 1.2 percentage points, respectively. Continued pressure could reduce the operating leverage generated by rapid revenue growth.
• Inventory and supply-chain exposure: Inventory rose approximately 42.8% from year-end and consumed $962.8 million of cash during the first nine months. Arista also identifies limited-source components, merchant-silicon dependence, tariffs and import or export restrictions as operating risks.
• Customer concentration and revenue variability: The company depends on large purchases from a limited number of customers. Changes in spending by those customers could make the current product-led growth rate volatile.
• Non-operating earnings variability: The $134.5 million strategic-investment gain contributed to GAAP earnings but was excluded from non-GAAP results. Similar gains may not recur consistently.
• Q4 margin execution: Revenue guidance calls for further sequential growth, while the non-GAAP operating-margin range is modestly below Q3’s 49.1%, making cost control and gross-margin performance important follow-up measures.

Summary

Arista’s Q3 2026 results were defined by product-led revenue growth, substantial operating leverage and higher non-operating income. The main offset was lower gross margin, while rising inventory created a larger working-capital burden despite improved nine-month operating cash flow. Q4 guidance points to continued sequential growth but allows for some moderation in non-GAAP operating margin, making product demand, inventory management and margin execution the principal issues to monitor.