On September 14, Ciena fell 6.83% in regular trading, trading at $325.47/share, with turnover of $76.24 million. The decline was driven by a confluence of negative catalysts hitting the optical communications sector.

On the news front, executives from four leading AI companies — including Anthropic's CEO, OpenAI's Sam Altman, Elon Musk, and Google DeepMind's Demis Hassabis — issued a rare unified call to slow frontier AI model development, citing the need to manage technology risks. OpenAI also announced it would not pursue an IPO this year, fueling broader AI deceleration concerns and weighing heavily on semiconductor and optical communications demand outlooks. The sector saw broad-based selling, with Corning and Coherent down over 9%, Astera Labs down over 8%, and Lumentum down over 7%.

Adding to the pressure, multiple investment banks cut price targets on Ciena, including Rothschild & Co Redburn lowering its target to $406.81 from $538.43, Argus to $550 from $650, and Needham to $520 from $600. Despite Ciena's strong fiscal Q3 results — adjusted EPS of $2.11 versus the $1.73 consensus, up 215% year-over-year, and an upwardly revised full-year revenue guide to $6.42 billion — the concentrated target cuts reflect institutional caution on valuation sustainability.

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