Arista Networks, Inc.

Arista Networks, Inc. is an American cloud networking company that designs, manufactures, and sells high-speed Ethernet switches, routing platforms, and network operating software, generating $9.0 billion in revenue in fiscal 2025. Founded in 2004 by former Cisco executives Andy Bechtolsheim and David Cheriton, Arista has grown from a niche provider of low-latency switches for financial trading firms into the dominant supplier of data center networking gear to the world's largest cloud operators, and increasingly, the networking backbone of the artificial intelligence infrastructure buildout.

This is a story about a company that won the last architecture war — Ethernet versus proprietary protocols in the cloud data center — and is now fighting the next one: Ethernet versus InfiniBand for the right to connect the GPUs powering AI. Arista's core thesis rests on the belief that Ethernet, with its open standards, massive ecosystem, and continuous innovation cycle, will become the universal fabric for AI clusters just as it did for cloud computing. The company's financial profile reflects the scale of that opportunity: revenue has quadrupled since 2020, operating margins sit above 42%, and the balance sheet carries over $12 billion in cash with zero debt.

The file turns on a single question: whether Arista can sustain its growth trajectory as the AI networking market matures and supply constraints test the company's ability to ship against what management describes as the strongest demand in its history. The bull case rests on Ethernet's seemingly inexorable march through the AI stack. The bear case asks whether the market is pricing in perfection for a hardware company whose two largest customers represent 42% of revenue and whose key supplier, Broadcom, sits at the other end of every critical component relationship.