Ciena CorpIn-line Q4 revenue guidance overshadowed earnings beat, causing 10% drop.
Ciena Corporation's stock tumbled 10% to $320.38 after its in-line fourth-quarter revenue outlook overshadowed a record fiscal third-quarter earnings beat, while Arista Networks edged up 3% to $191.65 on continued AI networking momentum. Ciena reported adjusted earnings per share of $2.11 against a $1.72 analyst consensus, with revenue of $1.67 billion versus a $1.63 billion estimate, up 37% from a year earlier. However, the company guided fiscal fourth-quarter revenue to $1.75 billion plus or minus $50 million, a midpoint that only aligns with the $1.7 billion consensus, and raised its full-year 2026 revenue guidance to $6.42 billion. Two customers accounted for 41.7% of quarterly revenue, highlighting concentration risk, while Cisco Systems held nearly flat and the iShares U.S. Technology ETF traded higher, suggesting Ciena's slide is company-specific rather than a sector-wide unwind. Ciena's preliminary fiscal 2027 outlook calls for at least 30% revenue growth on a backlog of $8.5 billion, making the December fourth-quarter report the next key inflection point.
Ciena CorpIn-line Q4 revenue guidance overshadowed earnings beat, causing 10% drop.
Arista NetworksContinued AI networking momentum cited as driver of Arista's rise.
Cisco Systems Inc