Arista Networks Inc. (ANET) delivered the kind of earnings report that makes investors very happy. Shares rallied over 15% in Thursday's after-hours session after the networking equipment maker crushed expectations and issued guidance that suggests the good times aren't over yet.

The Numbers Tell a Strong Story

Arista reported fourth-quarter earnings of 82 cents per share, comfortably ahead of the 76-cent Street estimate. Revenue came in at $2.49 billion, beating the $2.38 billion analyst consensus and representing a significant jump from $1.93 billion in the same quarter last year.

CEO Jayshree Ullal framed the results as validation of the company's evolution. "2025 was the year of validation of our Arista 2.0 momentum, as we hit the milestone of shipping a cumulative of 150 million ports," Ullal stated.

She added that the company "exceeded both our AI networking and campus expansion goals, delivering profitable growth and revenue of $9 billion."

Looking Forward

The guidance for the first quarter of 2026 gave investors even more reason to celebrate. Arista expects revenue of approximately $2.6 billion, well above the $2.45 billion analyst estimate. The company also projects non-GAAP gross margin between 62% and 63%, with a non-GAAP operating margin of around 46%.

Arista Networks stock rose 15.46% to $155.03 in Thursday's extended trading, reflecting investor enthusiasm for both the strong quarter and the optimistic outlook ahead.