Tranche Update on Ciena Corporation's Equity Buyback Plan announced on December 9, 2021.

Ciena Corporation is a network platform, software, and services company. The Company’s solutions enable a range of network operators to deploy and manage networks that deliver services to businesses and consumers. Its segments include Networking Platforms, Platform Software and Services, Blue Planet Automation Software and Services, and Global Services. Its Networking Platforms segment consists of its Optical Networking and Routing and Switching portfolios. Its Platform Software and Services segment provides domain control management, analytics, data and planning tools and applications to manage networks. Its Blue Planet Automation Software and Services segment includes multi-domain service orchestration (MDSO), inventory management (BPI), route optimization and analysis (ROA), multi-cloud orchestration (MCO), and unified assurance and analytics (UAA). Global Services segment offers a suite of value-added services that help its customers to build, operate and improve their networks.