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Table of Contents ( Mark One ) ■ UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington , D.C. 20549 FORM 10 - K ANNUAL REPORT PURSUANT TO SECTION 13 OR 15 ( d ) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended October 30 , 2021 TRANSITION REPORT PURSUANT TO SECTION 13 OR 15 ( d ) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from_ Delaware ( State or other jurisdiction of incorporation or organization ) 7035 Ridge Road , Hanover , MD ( Address of principal executive offices ) Title of each class Common Stock , $ 0.01 par value OR to Commission file number 001-36250 Ciena Corporation ( Exact name of registrant as specified in its charter ) Registrant's telephone number , including area code : ( 410 ) 694-5700 Securities registered pursuant to Section 12 ( b ) of the Act : Trading Symbol ( s ) 23-2725311 ( I.R.S. Employer Identification No. ) 21076 ( Zip Code ) Accelerated filer CIEN Securities registered pursuant to Section 12 ( g ) of the Act : None Indicate by check mark if the registrant is a well - known seasoned issuer , as defined in Rule 405 of the Securities Act . Yes þ No o Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15 ( d ) of the Act . Yes o No p 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 þ No o Name of each exchange on which registered New York Stock Exchange 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 ( § 232.405 of this chapter ) during the preceding 12 months ( or for such shorter period that the registrant was required to submit such files ) . Yes p No o 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 . Large accelerated filer Non - accelerated filer Smaller reporting company Emerging growth company If an emerging growth company , indicate 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 . O Indicate by check mark whether the registrant has filed a report on and attestation to its management's assessment of the effectiveness of its internal control over financial reporting under Section 404 ( b ) of the Sarbanes - Oxley Act ( 15 U.S.C. 7262 ( b ) ) by the registered public accounting firm that prepared or issued its audit report . Indicate by check mark whether the registrant is a shell company ( as defined in Rule 12b - 2 of the Act ) Yes □ No p The aggregate market value of the registrant's Common Stock held by non - affiliates of the registrant was approximately $ 7.8 billion based on the closing price of the Common Stock on the New York Stock Exchange on April 30 , 2021 . The number of shares of registrant's Common Stock outstanding as of December 10 , 2021 was 154,882,650 . DOCUMENTS INCORPORATED BY REFERENCE Part III of the Form 10 - K incorporates by reference certain portions of the registrant's definitive proxy statement for its 2022 Annual Meeting of Stockholders to be filed with the Commission not later than 120 days after the end of the fiscal year covered by this report .