Why Arista Networks Stock Rocketed 30% Higher in the First Half of 2026 and Why There's Likely More to Come

Arista Networks’ shares surged about 29.6% in the first half of 2026, according to S&P Global Market Intelligence data, far outpacing the roughly 10% gain of the S&P 500. The article attributes the jump to back-to-back strong quarterly results and rapid adoption of artificial intelligence by customers, pushing the stock to new all-time highs. In early February, the company reported record fourth-quarter revenue of $2.49 billion, up 29% year over year and 8% quarter over quarter, alongside adjusted EPS of $0.82 (+24%). Operating margin reached 47.5% and net income surpassed $1 billion in the quarter for the first time. Management raised its 2026 revenue outlook to $11.25 billion, implying 25% growth and an operating margin of 46%. For the next year, Arista expects AI-related sales to more than double to $3.25 billion, while also guiding 2026 revenue to $11.5 billion (+28%) with operating margin of 46% to 47%. The company also said it expects at least one, possibly two, new customers that each generate 10%+ of revenue by year-end, beyond Microsoft and Meta. Wall Street coverage cited 97% analyst buy or strong buy ratings, and an average price target of $192 suggesting about 10% upside.