Ciena Hits $583.74 After 609% AI-Driven Rally, Profit-Taking Urged at 58x EBITDA

Ciena shares trade near $583.74 following a 609% surge over the past year fueled by hyperscaler AI data-center spending. Cloud providers now contribute 42% of revenue as quarterly growth accelerated to 33% year-over-year. Management guides 28% full-year revenue expansion and operating margins near 18.5%, aided by its energy-efficient 1.6 Tbps optical products. Despite robust fundamentals, the $77 billion enterprise value at roughly 58 times 2026 EBITDA has prompted warnings to consider taking profits rather than adding at current levels.