Ciena (CIEN) reported adjusted earnings per share of $2.11 and revenue of $1.67 billion for the third fiscal quarter, both exceeding analyst expectations. However, its revenue guidance for the fourth fiscal quarter was $1.75 billion (plus or minus $50 million), with the midpoint only matching the analyst consensus of $1.7 billion, failing to surpass expectations. Consequently, Ciena's stock price fell 10% to close at $320.38. Meanwhile, Arista Networks (ANET) shares rose 3% to $191.65, and Cisco Systems (CSCO) shares remained largely flat, indicating that Ciena's decline was company-specific rather than an industry-wide issue.