Arista Networks stock jumped 5% to US$178.48 after investors digested its Q3 2026 report. Traders reacted to a blowout headline, with revenue of US$3.66b and operating margin around 49% grabbing attention across the cloud networking space. Yet the real story sits beyond today’s bounce. Multi quarter guidance around artificial intelligence fabrics, coupled with a trailing net profit margin near 40%, turns this print into a test of how much long term growth you believe is already priced into a P/E of 47.4x.

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Q3 2026 Earnings Summary

• Revenue…