ANET — Fast growth with a margin test attached

Arista is giving investors two things to evaluate: unusually fast growth and an already profitable business.

In its November 3 results, $ANET reported third-quarter revenue of about $3.66 billion, up 58.5% from a year earlier. Its operating margin under standard accounting rules was 44.9%. The adjusted figure, which excludes specified expenses, was 49.1%.

An operating margin tells you how much of each sales dollar remains after operating costs. Arista's reported figure means roughly 45 cents remained before interest and taxes. This is not simply a story about selling more networking equipment.

The important question is how much of that profitability survives the next expansion.

For the fourth quarter, management expects revenue of $3.9 billion to $4 billion and an adjusted operating margin of 48% to 49%. That pairs further sales growth with an adjusted margin around, or a little below, the latest quarter.

That is not proof of deterioration. Product mix, investment, and the timing of costs can affect a quarter. It does mean investors should avoid assuming that a higher sales forecast automatically brings a higher margin.

Arista's results support a strong business-performance argument, while the forecast gives shareholders a specific test of how growth translates into profit. Neither figure alone settles whether the shares are attractively priced.

In the next report, compare actual revenue with that range, then check both accounting and adjusted operating margins. Growth is more informative when you can see what the company keeps.

Source: https://www.arista.com/en/company/news/press-release/25025-pr-20261103