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STATES\n\nSECURITIES AND EXCHANGE COMMISSION\n\nWashington, D.C. 20549\n\nFORM 10-Q\n\n(Mark one)\n\n☑QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934\n\nFor the quarterly period ended May 2, 2026\n\nOR\n\n☐TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934\n\nFor the transition period from                    to                    \n\nCommission File Number: 001-36250\n\nCiena Corporation\n\n(Exact name of registrant as specified in its charter)\n\nDelaware\n\n(State or other jurisdiction of incorporation or organization)\n\n7035 Ridge Road, Hanover, MD\n\n(Address of principal executive offices)\n\n23-2725311\n\n(I.R.S. Employer Identification No.)\n\n21076\n\n(Zip Code)\n\n(410) 694-5700\n\n(Registrant’s telephone number, including area code)\n\nSecurities registered pursuant to Section 12(b) of the Act:\n\nTitle of each classTrading Symbol(s)Name of each exchange on which registered\n\nCommon Stock, par value $0.01 per shareCIENNew York Stock Exchange\n\nIndicate 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 ☐\n\nIndicate 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 ☐\n\nIndicate 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.\n\nLarge accelerated filer☑Accelerated filer\n☐\nNon-accelerated filer\n☐\nSmaller reporting company☐\n\nEmerging growth company☐\n\nIf 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. ☐ \n\nIndicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act). Yes ☐ No ☑\n\nIndicate the number of shares outstanding of each of the issuer’s classes of common stock, as of the latest practicable date:\n\nClass\nOutstanding as of May 29, 2026\n\nCommon Stock, par value $0.01 per share141,552,922\n\nCIENA CORPORATION\n\nINDEX\n\nFORM 10-Q\n\n PAGE\nNUMBER\n\n[PART I — FINANCIAL INFORMATION](#i296d217d2a9e453083081ad02d1b6820_10)\n \n\n[Item 1. Financial Statements (unaudited)](#i296d217d2a9e453083081ad02d1b6820_7)\n\n[3](#i296d217d2a9e453083081ad02d1b6820_13)\n\n[Condensed Consolidated Statements of Operations for the Quarters and Six Months Ended May 2, 2026 and May 3, 2025](#i296d217d2a9e453083081ad02d1b6820_16)\n\n[3](#i296d217d2a9e453083081ad02d1b6820_16)\n\n[Condensed Consolidated Statements of Comprehensive Income for the Quarters and Six Months Ended May 2, 2026 and May 3, 2025](#i296d217d2a9e453083081ad02d1b6820_19)\n\n[4](#i296d217d2a9e453083081ad02d1b6820_19)\n\n[Condensed Consolidated Balance Sheets at May 2, 2026 and November 1, 2025](#i296d217d2a9e453083081ad02d1b6820_22)\n\n[5](#i296d217d2a9e453083081ad02d1b6820_22)\n\n[Condensed Consolidated Statements of Cash Flows for the Six Months Ended May 2, 2026 and May 3, 2025](#i296d217d2a9e453083081ad02d1b6820_25)\n\n[6](#i296d217d2a9e453083081ad02d1b6820_25)\n\n[Condensed Consolidated Statements of Changes in Stockholders’ Equity for the Six Months Ended May 2, 2026 and May 3, 2025](#i296d217d2a9e453083081ad02d1b6820_28)\n\n[7](#i296d217d2a9e453083081ad02d1b6820_28)\n\n[Notes to Condensed Consolidated Financial Statements](#i296d217d2a9e453083081ad02d1b6820_31)\n\n[8](#i296d217d2a9e453083081ad02d1b6820_31)\n\n[Item 2. Management’s Discussion and Analysis of Financial Condition and Results of Operations](#i296d217d2a9e453083081ad02d1b6820_136)\n\n[26](#i296d217d2a9e453083081ad02d1b6820_136)\n\n[Item 3. Quantitative and Qualitative Disclosures About Market Risk](#i296d217d2a9e453083081ad02d1b6820_160)\n\n[36](#i296d217d2a9e453083081ad02d1b6820_160)\n\n[Item 4. Controls and Procedures](#i296d217d2a9e453083081ad02d1b6820_163)\n\n[36](#i296d217d2a9e453083081ad02d1b6820_163)\n\n[PART II — OTHER INFORMATION](#i296d217d2a9e453083081ad02d1b6820_166)\n \n\n[Item 1. Legal Proceedings](#i296d217d2a9e453083081ad02d1b6820_169)\n\n[37](#i296d217d2a9e453083081ad02d1b6820_169)\n\n[Item 1A. Risk Factors](#i296d217d2a9e453083081ad02d1b6820_172)\n\n[37](#i296d217d2a9e453083081ad02d1b6820_172)\n\n[Item 2. Unregistered Sales of Equity Securities and Use of Proceeds](#i296d217d2a9e453083081ad02d1b6820_175)\n\n[37](#i296d217d2a9e453083081ad02d1b6820_175)\n\n[Item 3. Defaults Upon Senior Securities](#i296d217d2a9e453083081ad02d1b6820_181)\n\n[37](#i296d217d2a9e453083081ad02d1b6820_181)\n\n[Item 4. Mine Safety Disclosures](#i296d217d2a9e453083081ad02d1b6820_184)\n\n[38](#i296d217d2a9e453083081ad02d1b6820_184)\n\n[Item 5. Other Information](#i296d217d2a9e453083081ad02d1b6820_187)\n\n[38](#i296d217d2a9e453083081ad02d1b6820_187)\n\n[Item 6. Exhibits](#i296d217d2a9e453083081ad02d1b6820_193)\n\n[39](#i296d217d2a9e453083081ad02d1b6820_193)\n\n[Signatures](#i296d217d2a9e453083081ad02d1b6820_196)\n\n[40](#i296d217d2a9e453083081ad02d1b6820_196)\n\n2\n\nPART I – FINANCIAL INFORMATION"}