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(Mark one)

For the transition period from                    to                    

Commission File Number: 001-36250

(Exact name of registrant as specified in its charter)

(Registrant’s telephone number, including area code)

Securities registered pursuant to Section 12(b) of the Act:

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days. Yes ☑ No ☐

Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T during the preceding 12 months (or for such shorter period that the registrant was required to submit such files). Yes ☑ No ☐

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company, or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company,” and “emerging growth company” in Rule 12b-2 of the Exchange Act.

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐ 

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act). Yes ☐ No ☑

Indicate the number of shares outstanding of each of the issuer’s classes of common stock, as of the latest practicable date:

			August 2, 2025						November 2, 2024
ASSETS
Current assets:
Cash and cash equivalents			$	1,055,976					$	934,863
Short-term investments			270,380						316,343
Accounts receivable, net of allowance for credit losses of $9.5 million and $9.9 million as of August 2, 2025 and November 2, 2024, respectively.			1,025,563						908,597
Inventories, net			860,403						820,430
Prepaid expenses and other			473,901						564,183
Total current assets			3,686,223						3,544,416
Long-term investments			64,397						80,920
Equipment, building, furniture and fixtures, net			368,348						337,722
Operating right-of-use assets			40,347						27,417
Goodwill			444,828						444,707
Other intangible assets, net			138,673						165,020
Deferred tax asset, net			851,903						886,441
Other long-term assets			154,059						154,694
Total assets			$	5,748,778					$	5,641,337
LIABILITIES AND STOCKHOLDERS’ EQUITY
Current liabilities:
Accounts payable			$	464,684					$	423,401
Accrued liabilities and other short-term obligations			436,312						393,905
Deferred revenue			196,209						156,379
Operating lease liabilities			14,694						14,455
Current portion of long-term debt			11,580						11,700
Total current liabilities			1,123,479						999,840
Long-term deferred revenue			81,057						81,240
Other long-term obligations			195,976						185,938
Long-term operating lease liabilities			34,498						25,107
Long-term debt, net			1,526,467						1,533,074
Total liabilities			2,961,477						2,825,199
Commitments and contingencies (Note 18)
Stockholders’ equity:
Preferred stock – par value $0.01; 20,000,000 shares authorized; zero shares issued and outstanding			—						—
Common stock – par value $0.01; 290,000,000 shares authorized; 141,342,527 and 142,656,116 shares issued and outstanding			1,413						1,427
Additional paid-in capital			6,020,315						6,154,869
Accumulated other comprehensive loss			(44,829)						(46,711)
Accumulated deficit			(3,189,598)						(3,293,447)
Total stockholders’ equity			2,787,301						2,816,138
Total liabilities and stockholders’ equity			$	5,748,778					$	5,641,337

			Common Stock Shares						Par Value						Additional Paid-in-Capital						Accumulated Other Comprehensive Loss						Accumulated Deficit						Total Stockholders’ Equity
Balance at November 2, 2024			142,656,116						$	1,427					$	6,154,869					$	(46,711)					$	(3,293,447)					$	2,816,138
Net income			—						—						—						—						103,849						103,849
Other comprehensive income			—						—						—						1,882						—						1,882
Repurchase of common stock - repurchase program, net			(3,268,252)						(33)						(246,062)						—						—						(246,095)
Issuance of shares from employee equity plans			2,754,659						27						35,847						—						—						35,874
Share-based compensation expense			—						—						135,696						—						—						135,696
Shares repurchased for tax withholdings on vesting of stock unit awards			(799,996)						(8)						(60,035)						—						—						(60,043)
Balance at August 2, 2025			141,342,527						$	1,413					$	6,020,315					$	(44,829)					$	(3,189,598)					$	2,787,301

(1) INTERIM FINANCIAL STATEMENTS

The interim financial statements for Ciena Corporation and its wholly owned subsidiaries (“Ciena”) included herein have been prepared by Ciena, without audit, pursuant to the rules and regulations of the U.S. Securities and Exchange Commission (the “SEC”).

The preparation of financial statements and related disclosures in conformity with accounting principles generally accepted in the United States (“GAAP”) requires Ciena to make judgments, assumptions, and estimates that affect the amounts reported in the Condensed Consolidated Financial Statements and accompanying notes. Among other things, these estimates form the basis for judgments about the carrying values of assets and liabilities that are not readily apparent from other sources. Actual results may differ materially from these estimates under different assumptions or conditions. To the extent that there are material differences between Ciena’s estimates and actual results, Ciena’s consolidated financial statements will be affected.

In the opinion of management, the financial statements included in this report reflect all normal recurring adjustments that Ciena considers necessary for the fair statement of the results of operations of Ciena for the interim periods covered and of the financial position of Ciena at the date of the interim balance sheets. Certain information and footnote disclosures normally included in the annual financial statements prepared in accordance with GAAP have been condensed or omitted pursuant to SEC rules and regulations. The Condensed Consolidated Balance Sheet as of November 2, 2024 was derived from audited financial statements but does not include all disclosures required by GAAP. However, Ciena believes that the disclosures are adequate to understand the information presented herein. The operating results for interim periods are not necessarily indicative of the operating results for the entire year. These financial statements should be read in conjunction with Ciena’s audited consolidated financial statements and the notes thereto included in Ciena’s Annual Report on Form 10-K for the fiscal year ended November 2, 2024 (the “2024 Annual Report”).

Ciena has a 52 or 53-week fiscal year, with quarters ending on the Saturday nearest to the last day of January, April, July, and October, respectively, of each year. Fiscal 2025 is a 52-week fiscal year. Fiscal 2024 was a 53-week fiscal year with the additional week occurring in the fourth quarter.

(2) SIGNIFICANT ACCOUNTING POLICIES

There have been no material changes to Ciena’s significant accounting policies, compared to the accounting policies described in Note 1, Ciena Corporation and Significant Accounting Policies and Estimates, in Notes to Consolidated Financial Statements in Item 8 of Part II of the 2024 Annual Report.

In November 2023, the FASB issued ASU No. 2023-07 (“ASU 2023-07”), Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures, to improve reportable segment disclosure requirements, primarily through enhanced disclosures about significant segment expenses. ASU 2023-07 is effective for Ciena’s fiscal 2025 Annual Report on Form 10-K on a retrospective basis. Ciena is currently evaluating the impact of this ASU on its segment disclosures.

In December 2023, the FASB issued ASU No. 2023-09 (“ASU 2023-09”), Income Taxes (Topic 740): Improvement to Income Tax Disclosures, to enhance the transparency and decision usefulness of income tax disclosures. ASU 2023-09 is effective for annual periods beginning after December 15, 2024. ASU 2023-09 allows for adoption using either a prospective or retrospective method. Ciena is currently evaluating the impact of this ASU on its consolidated financial statements and related disclosures.

In November 2024, the FASB issued ASU No. 2024-03 (“ASU 2024-03”), Income Statement—Reporting Comprehensive Income—Expense Disaggregation Disclosures (Subtopic 220-40), to improve financial reporting by requiring that public business entities disclose additional information about specific expense categories in the notes to financial statements at interim and annual reporting periods. ASU 2024-03 is effective for annual periods beginning after December 15, 2026, and interim reporting periods beginning after December 15, 2027; however, early adoption is permitted. ASU 2024-03 allows for adoption using either a prospective or retrospective method. Ciena is currently evaluating the impact of this ASU on its consolidated financial statements and related disclosures.

In July 2025, the FASB issued ASU No. 2025-05 (“ASU 2025-05”), Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses for Accounts Receivable and Contract Assets, to introduce a practical expedient for all entities, which simplifies the calculation required for estimating credit losses and assumes that current conditions as of the balance sheet date do not change for the remaining life of the asset. ASU 2025-05 is effective for annual reporting periods beginning after December 15, 2025, and interim reporting periods within those annual reporting periods; however, early adoption is permitted. ASU 2025-25 allows for adoption using a prospective method. Ciena is currently evaluating the impact of this ASU on its consolidated financial statements and related disclosures.

(3) REVENUE

Ciena’s disaggregated segment and product line revenue as presented below depicts the nature, amount, and timing of revenue and cash flows for similar groupings of Ciena’s various offerings. The sales cycle, contractual obligations, customer requirements, and go-to-market strategies may differ for each of its product categories, resulting in different economic risk profiles for each category. Ciena has the following operating segments for reporting purposes: (i) Networking Platforms; (ii) Platform Software and Services; (iii) Blue Planet Automation Software and Services; and (iv) Global Services. See Note 17 below.

The tables below set forth Ciena’s disaggregated revenue for the periods indicated (in thousands):