Nvidia: From Under Four Percent to Twenty-One in a YearThin moat

Nvidia's share of the data-centre Ethernet switch market went from under 4% to roughly 21.5% in a year, in a market that itself grew almost 40% to $15.4 billion in the first quarter of 2026¹. That is the fastest entry into a networking market anyone has managed, and it was not achieved with better switches.

It was achieved with bundling. A customer buying an Nvidia rack is buying accelerators, interconnect, DPUs and now switching from one vendor, pre-integrated and validated together, with a single support relationship. Arista's counter — that a best-of-breed network built on EOS outperforms a bundled one and avoids lock-in — is a good argument that has to be made to a buyer who is already under enormous pressure to deploy GPUs quickly.

The scale-up market is worse. Nvidia's proprietary interconnect owns the inside of the rack, where accelerators talk to each other, and Arista's Ethernet-based answer is a 2027 opportunity rather than a current product. That is a whole market segment Arista does not yet address, growing faster than the one it leads.

Watch Arista's AI networking revenue against its own target rather than against Nvidia's share. Arista raised its 2026 AI target repeatedly and the back-end business is real; the question is not whether Arista grows but whether it holds position in a market Nvidia is entering from a position no networking company has ever had.