Madison Investments trims Arista Networks after Q2 2026 gain

The story turns on who is selling and why. Madison Investments told investors that Arista Networks was a leading performance contributor for its Mid Cap Fund in Q2 2026, yet the same fund reduced its position. Read together, those two facts point to a valuation judgment rather than a change of heart about the business: the demand and backlog that drove the quarter's gains are, in this holder's view, already in the price.

The article frames the debate around what has to keep going right. Arista's 2026 AI fabrics guidance of at least US$3.5b to US$3.6b, inside roughly US$12.6b of total revenue, rests on large cloud providers continuing to favor Ethernet-based solutions over proprietary alternatives, and on Arista broadening beyond a handful of hyperscalers into enterprise and campus networking. If either side underdelivers, the high margin profile and current valuation expectations could come under pressure, the article notes. Customer concentration is the swing factor, and the more cautious analysts cited already flag reliance on a few hyperscalers as a possible cap on the stock's appeal.

The distance between the camps is wide. One bullish view pencilled in about US$24.4b of revenue and US$8.7b of earnings by 2029, while the narrative in the article projects US$21.4b of revenue and US$8.2b of earnings by 2029, requiring roughly a doubling of earnings from about US$4.0b today. For holders, the outcome appears to hinge on whether hyperscaler AI data center buildouts keep pace and on whether Arista can widen its customer base beyond those few large buyers.