Arista Networks Stock Rallied, But Is It Now A Bet On Its Suppliers?

Arista Networks (ANET) stock has gained about 51% since mid-December, against about 12% for the S&P 500. Peers Dell Technologies (DELL) rose 293% and Hewlett Packard Enterprise (HPE) 135%, while Cisco Systems (CSCO) gained about 40%. AI demand is the obvious explanation, and it is real. But management linked its latest outlook raise to a better supply position, and the CEO says the industry is still short of parts. From here, the shares are a bet on those parts arriving.

Arista Had The Demand Before It Had The Parts

Back in February, the company’s full-year revenue forecast came in above Wall Street estimates, and the shares jumped more than 17% in extended trading. Arista’s AI customer base has widened fast. Its Etherlink switches for AI fabrics now count more than 100 cumulative customers, against four or five in 2024.

Shipping into that demand was the hard part. For six months before its August results, management had been warning of industry-wide supply tightness and rising component costs. By the CFO’s account, the outlook now reflects the supply Arista is confident it can get.

So Arista Committed Billions To Getting Its Parts

Arista’s multiyear purchase commitments reached about $9.7 billion at the end of June 2026, up from $3.6 billion a year earlier. Most of the commitments are for chips tied to new products and AI deployments. Management says memory supply is secured for 2026, with visibility well into 2027, though that covers memory, not every component. Arista now has three contract manufacturers and three distribution facilities across the U.S., Asia, and Mexico.

In the June quarter, revenue passed $3 billion for the first time, up 38% from a year earlier and above Arista’s own $2.8 billion guide. Management then raised its 2026 revenue outlook for the third time, to about $12.6 billion from $11.5 billion in May, and cited its improving supply position.

And The Price You Pay Now Rests On That Supply Holding

At about $238 billion, Arista’s market value is roughly 23 times its $10.54 billion of revenue over the last twelve months. Shares priced like that need the outlook delivered. And management says the product mix of the $1.1 billion raise depends on what Arista manages to ship.

Management concedes its supply problems have not all gone away, and the CEO does not expect the industry to get past the shortage until 2028. The 62% to 64% gross margin range Arista kept for fiscal 2026 already includes expected cost increases for memory and silicon. Management expects price increases to help only toward the end of 2026, or more likely in 2027, because Arista is still shipping through its backlog. So costs reach the gross margin before prices do, even as Arista raised its fiscal 2026 operating margin target to 48% to 49%.

Real revenue stands behind the gain, and holding it now leans on supply keeping pace. The first check is the September 2026 quarter, guided to about $3.3 billion. If more supply comes through, watch for a fourth raise to the 2026 outlook. To follow that, our guidance-driven momentum screen tracks the companies whose guidance keeps moving up.

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