Ciena^® Corporation (NYSE: CIEN), a networking systems, services and software company, today announced unaudited financial results for its fiscal second quarter ended April 29, 2023.

• Q2 Revenue: $1.13 billion
• Q2 Net Income per Share: $0.38 GAAP; $0.74 adjusted (non-GAAP)

"We delivered outstanding results for the fiscal second quarter as we were able to ship more to customers with continued improvements in supply chain dynamics," said Gary Smith, president and CEO of Ciena. "We are confident in our ability to take market share given our backlog and strategic industry position with market-leading technologies and an expanding addressable market."

For fiscal second quarter 2023, Ciena reported revenue of $1.13 billion as compared to $949.2 million for the fiscal second quarter 2022.

Ciena's GAAP net income for the fiscal second quarter 2023 was $57.7 million, or $0.38 per diluted common share, which compares to a GAAP net income of $38.9 million, or $0.25 per diluted common share, for the fiscal second quarter 2022.

Ciena's adjusted (non-GAAP) net income for the fiscal second quarter 2023 was $110.4 million, or $0.74 per diluted common share, which compares to an adjusted (non-GAAP) net income of $76.4 million, or $0.50 per diluted common share, for the fiscal second quarter 2022.

Fiscal Second Quarter 2023 Performance Summary

The tables below (in millions, except percentage data) provide comparisons of certain quarterly results to the prior year. Appendices A and B set forth reconciliations between the GAAP and adjusted (non-GAAP) measures contained in this release.

Additional Performance Metrics for Fiscal Second Quarter 2023

• One customer represented 10%-plus of revenue for a total of 10.9% of revenue
• Cash and investments totaled $1.34 billion
• Cash flow from operations totaled $229.8 million
• Average days' sales outstanding (DSOs) were 97
• Accounts receivable, net balance was $1.04 billion
• Unbilled contract assets, net balance was $180.0 million
• Inventories totaled $1.10 billion, including:
  • Raw materials: $753.4 million
  • Work in process: $20.9 million
  • Finished goods: $308.0 million
  • Deferred cost of sales: $58.1 million
  • Reserve for excess and obsolescence: $(42.3) million
• Product inventory turns were 2.0
• Headcount totaled 8,385

Supplemental Materials and Live Web Broadcast of Unaudited Fiscal Second Quarter 2023 Results Today, Tuesday, June 6, 2023, in conjunction with this announcement, Ciena has posted to the Quarterly Results page of the Investor Relations section of its website certain related supporting materials for its unaudited fiscal second quarter 2023 results.

Ciena's management will also host a discussion today with investors and financial analysts that will include the Company's outlook. The live audio web broadcast beginning at 8:30 a.m. Eastern will be accessible via www.ciena.com. An archived replay of the live broadcast will be available shortly following its conclusion on the Investor Relations page of Ciena's website.

Notes to Investors

Forward-Looking Statements. You are encouraged to review the Investors section of our website, where we routinely post press releases, Securities and Exchange Commission ("SEC") filings, recent news, financial results, supplemental financial information, and other announcements. From time to time we exclusively post material information to this website along with other disclosure channels that we use. This press release contains certain forward-looking statements that involve risks and uncertainties. These statements are based on current expectations, forecasts, assumptions and other information available to the Company as of the date hereof. Forward-looking statements include statements regarding Ciena's expectations, beliefs, intentions or strategies regarding the future and can be identified by forward-looking words such as "anticipate," "believe," "could," "estimate," "expect," "intend," "may," "should," "will," and "would" or similar words. Forward-looking statements in this release include: "We delivered outstanding results for the fiscal second quarter as we were able to ship more to customers with continued improvements in supply chain dynamics, We are confident in our ability to take market share given our backlog and strategic industry position with market-leading technologies and an expanding addressable market."

Ciena's actual results, performance or events may differ materially from these forward-looking statements made or implied due to a number of risks and uncertainties relating to Ciena's business, including: the effect of broader economic and market conditions on our customers and their business; our ability to execute our business and growth strategies; the impact of supply chain constraints or disruptions; the duration and severity of the COVID-19 pandemic and the impact of countermeasures taken to mitigate its spread on macroeconomic conditions, economic activity, demand for our technology solutions, short- and long-term changes in customer or end user needs, continuity of supply chain, our business operations, liquidity and financial results; changes in network spending or network strategy by our customers; seasonality and the timing and size of customer orders, including our ability to recognize revenue relating to such sales; the level of competitive pressure we encounter; the product, customer and geographic mix of sales within the period; changes in foreign currency exchange rates; factors beyond our control such as natural disasters, climate change, acts of war or terrorism, geopolitical events, including but not limited to

the ongoing conflict between Ukraine and Russia, and public health emergencies; changes in tax or trade regulations, including the imposition of tariffs, duties or efforts to withdraw from or materially modify international trade agreements; and the other risk factors disclosed in Ciena’s periodic reports filed with the Securities and Exchange Commission (SEC) including Ciena’s Annual Report on Form 10-K filed with the SEC on December 16, 2022 and included in its Quarterly Report on Form 10-Q for the second quarter of fiscal 2023 to be filed with the SEC. Ciena assumes no obligation to update any forward-looking information included in this press release.

Non-GAAP Presentation of Quarterly and Annual Results. This release includes non-GAAP measures of Ciena's gross profit, operating expense, income from operations, earnings before interest, tax, depreciation and amortization (EBITDA), Adjusted EBITDA, and measures of net income and net income per share. In evaluating the operating performance of Ciena's business, management excludes certain charges and credits that are required by GAAP. These items share one or more of the following characteristics: they are unusual and Ciena does not expect them to recur in the ordinary course of its business; they do not involve the expenditure of cash; they are unrelated to the ongoing operation of the business in the ordinary course; or their magnitude and timing is largely outside of Ciena's control. Management believes that the non-GAAP measures below provide management and investors useful information and meaningful insight to the operating performance of the business. The presentation of these non- GAAP financial measures should be considered in addition to Ciena's GAAP results and these measures are not intended to be a substitute for the financial information prepared and presented in accordance with GAAP. Ciena's non-GAAP measures and the related adjustments may differ from non-GAAP measures used by other companies and should only be used to evaluate Ciena's results of operations in conjunction with our corresponding GAAP results. To the extent not previously disclosed in a prior Ciena financial results press release, Appendices A and B to this press release set forth a complete GAAP to non-GAAP reconciliation of the non-GAAP measures contained in this release.

About Ciena. Ciena (NYSE: CIEN) is a networking systems, services and software company. We provide solutions that help our customers create the Adaptive Network™ in response to the constantly changing demands of their users. By delivering best-in-class networking technology through high-touch consultative relationships, we build the world’s most agile networks with automation, openness and scale. For updates on Ciena, follow us on Twitter @Ciena, LinkedIn, the Ciena Insights blog, or visit www.ciena.com.

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The adjusted (non-GAAP) measures above and their reconciliation to Ciena's GAAP results for the periods presented reflect adjustments relating to the following items:

• Share-based compensation - a non-cash expense incurred in accordance with share-based compensation accounting guidance.
• Significant asset impairments and restructuring costs - costs incurred as a result of restructuring activities taken to align resources with perceived market opportunities, and the redesign of business processes including restructuring certain real estate facilities.
• Amortization of intangible assets - a non-cash expense arising from the acquisition of intangible assets, principally developed technologies and customer-related intangibles, that Ciena is required to amortize over its expected useful life.
• Acquisition and integration costs - primarily consist of financial, legal and accounting advisors' costs and employment-related costs related to Ciena's acquisitions in fiscal 2022 and fiscal 2023.
• Non-GAAP tax provision - consists of current and deferred income tax expense commensurate with the level of adjusted income before income taxes and utilizes a current, blended U.S. and foreign statutory annual tax rate of 22.0% for the second fiscal quarter of 2023 and 20.2% for the second fiscal quarter of 2022. This rate may be subject to change in the future, including as a result of changes in tax policy or tax strategy.

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