Ciena Corp Officer Files Form 144 to Sell 2,500 Shares Under Rule 10b5-1 Plan

Executive Summary

On September 15, 2026, David Rothenstein, an Officer at Ciena Corporation (NYSE: CIEN), filed a Form 144 notice of proposed sale for 2,500 shares of common stock with an aggregate market value of approximately $799,100 ($319.64 per share).

Transaction Breakdown

• Security: Common Stock
• Shares to be Sold: 2,500
• Aggregate Market Value: $799,100.00
• Broker: Morgan Stanley Smith Barney LLC Executive Financial Services
• Approximate Sale Date: September 15, 2026
• Trading Plan: Executed pursuant to a Rule 10b5-1 trading plan adopted on October 10, 2025.
• Origin of Securities: Acquired via Restricted Stock Units (RSUs) vesting between March 20, 2021, and September 20, 2024.

Prior 3-Month Activity

• August 14, 2026: Sold 2,500 shares for $1,095,250.00 gross proceeds under 10b5-1 plan.
• July 15, 2026: Sold 2,500 shares for $1,052,284.25 gross proceeds under 10b5-1 plan.

Trading Significance

This filing represents a routine, programmatic sale under a pre-established Rule 10b5-1 trading plan adopted in October 2025, continuing a monthly schedule of 2,500-share dispositions. As such, the market significance is considered Low.