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Cisco Stock Plunges 11% Despite Earnings Beat as Margin Concerns Overshadow AI Infrastructure Gains

Cisco Systems reported better-than-expected second quarter fiscal 2026 results with revenue of $15.35 billion and adjusted EPS of $1.04, but shares tumbled 11% in Thursday trading as the company's profit margin guidance disappointed investors. Rising memory chip costs and tepid forward projections overshadowed robust AI infrastructure order growth of $2.1 billion.