On October 8, Ciena fell 3.35% in pre-market trading, trading at $430.16 per share, with turnover of $325.21 million.

The decline comes amid sustained pressure across the optical communications sector, as market concerns over lofty valuations and slowing AI computing demand triggered broad-based selling. One day earlier, the sector had already shown widespread losses, with Lumentum falling 2.31%, Applied Optoelectronics falling 3.56%, Nokia falling 2.27%, Cisco falling 0.78%, and Arista Networks falling 0.79%.

While multiple investment banks had recently issued upgrades on Ciena, with Bernstein initiating coverage at Outperform with a $440 price target and Evercore ISI raising its target to $550, the stock now faces profit-taking pressure as prior sector-wide gains are unwound in a systematic pullback environment.

(The above content is based on publicly available market information, generated by a program or algorithm, and is intended solely as a stock movement alert. It does not constitute investment advice or a basis for trading decisions.)