Arista Networks, Inc. (ANET) has seen a remarkable 64.7% year-to-date stock rise, significantly outperforming the Internet software industry's 8.8% growth. The company has also surpassed the Zacks Computer & Technology sector and the S&P 500 in the same period. While it has underperformed against Hewlett Packard Enterprise Company (HPE), which gained 200.1%, it has outperformed Cisco Systems, Inc. (CSCO) with a 52.4% increase.
Arista is capitalizing on the growing demand for Ethernet-based networking infrastructure, particularly in AI data centers. By the second quarter of 2026, the company reported over 100 customers using its Etherlink AI-fabric switches, a sharp increase from just a handful in 2024. The newer 7060XE7 platform supports up to 1.6-terabit throughput, featuring technologies like Smart System Upgrade (SSU) and Multipath Reliable Connection (MRC) to enhance network reliability and accelerator utilization. Arista's Scale-Across architecture is designed to connect AI infrastructure across multiple locations, with the company expecting this opportunity to reach $15-$20 billion by 2030.
Despite these growth drivers, Arista faces challenges, including customer concentration and high inventory levels. The company's inventory reached approximately $2.5 billion at the end of the second quarter, up from $2.4 billion in the prior quarter. Competitive pressures from major players like Cisco and HPE are also a concern, as evidenced by a decline in gross margins from 65.6% to 63.4% year-over-year. Management expects full-year margins to remain within a 62-64% range due to higher costs related to memory and silicon.
From a valuation standpoint, Arista's shares trade at a price/earnings ratio of 44.66, higher than the industry average of 30.95. While earnings estimates for 2026 have remained unchanged, they have increased for 2027 over the past 60 days. Overall, Arista has a balanced outlook, with strong AI-driven growth prospects offset by customer concentration, supply-chain risks, and valuation concerns.