Why Ciena Corporation (CIEN) stock fell 11.3% on Monday, November 2, 2026

Ciena Corporation (CIEN) closed at $284.34, down 11.34% on Monday, November 2, 2026, on volume of 4,317,822 shares (1.6× its 3-month average); market value about $40.30B.

What happened: primary sources

Events Nexqual found for CIEN on Monday, November 2, 2026 or the trading day before (October 30, 2026):

• Nov 2, 2026: One of 3 Communication Equipment stocks among the day's biggest losers (LITE, CIEN, ASTS), with no comparable group among the biggest gainers

These are listed as context. A filing or rating change on the same day is not proof that it caused the move; read the source.

More on CIEN

CIEN stock page: price, SEC financials, insider trades, superinvestor holders, analyst estimates and options. Other big moves that day: November 2, 2026.

Sources: SEC EDGAR, Nexqual Earnings Flash, analyst rating changes, Nexqual market data. Built November 4, 2026 at 10:46 UTC. Not investment advice.

Data source: Nexqual. Last updated: November 4, 2026 at 10:46 UTC. This page is informational and not investment advice.

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