Arista Networks — Financial Results

Revenue Surged 29% to $9 Billion, Driven by AI and Cloud Demand

Arista crossed $9 billion in annual revenue for the first time, adding over $2 billion compared to 2024. Both hardware (switches and routers) and support contracts grew at nearly the same pace, suggesting the growth is broad-based rather than a one-time spike. The company's two largest customers alone accounted for 42% of revenue, meaning a handful of big spenders are still driving a significant portion of results.

Gross Margin Held Steady at 64.1% Despite Cost Pressures

Arista kept its gross margin (the percentage of revenue left after paying for the products themselves) flat at 64.1% in 2025, matching 2024 exactly. This is notable because the company flagged real headwinds — tighter memory supply, tariff uncertainty, and pricing discounts given to large customers. Holding the line here suggests strong pricing power, though management warns margins could come under pressure if supply conditions worsen.

Operating Cash Flow Hit $4.4 Billion, Balance Sheet Fortress Continues

Arista generated $4.4 billion in cash from its operations — money coming in the door from running the business — up 18% from 2024. Sitting on $10.7 billion in cash and investments gives the company enormous flexibility to invest, acquire, or return money to shareholders without needing to borrow.

R&D Spending Jumped 24%, Signaling Heavy Investment in New Products

Research and development (R&D) spending rose $240.6 million to $1.24 billion in 2025. A significant portion of that increase — $78.6 million — went toward prototyping and third-party engineering for new products, particularly in AI networking. This is Arista betting on its next wave of growth, though it means costs are rising faster than they have historically.

Deferred Revenue Ballooned by $2.5 Billion, Reflecting AI Trial Contracts

Deferred revenue (money received from customers but not yet counted as revenue, because the product hasn't been fully accepted yet) jumped $2.5 billion in 2025. This is largely tied to AI networking contracts that include customer acceptance periods — essentially, customers are trialing equipment before formally signing off. Once accepted, this revenue will be recognized, but if trials fail, product returns are possible.

Tax Rate Rose Sharply from 12.6% to 17.4%, Cutting Into Profits

The tax bill nearly doubled year-over-year, rising $325 million. The primary driver was a reduction in tax benefits from employee stock compensation — a benefit that can fluctuate significantly and is hard to predict. New U.S. tax legislation signed in mid-2025 also played a role. This is worth watching, as a higher tax rate directly reduces the net income shareholders see.

$1.6 Billion Returned to Shareholders Through Stock Buybacks

Arista repurchased $1.6 billion of its own stock in 2025 — nearly four times the $423.6 million bought back in 2024. The board authorized a new $1.5 billion buyback program in May 2025, with approximately $818 million still available at year-end. Buybacks reduce the number of shares outstanding, which can increase earnings per share (profit divided among fewer shares) for remaining investors.