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( 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 TRANSITION REPORT PURSUANT TO SECTION 13 OR 15 ( d ) OF THE SECURITIES EXCHANGE ACT OF 1934 Title of each class Common Stock , $ 0.0001 par value For the fiscal year ended December 31 , 2020 OR Delaware ( State or other jurisdiction of incorporation or organization ) For the transition period from to Commission file number : 000-32259 ALIGN TECHNOLOGY , INC . ( Exact name of registrant as specified in its charter ) Large accelerated filer Non - accelerated filer 410 North Scottsdale Road , Suite 1300 Tempe , Arizona 85281 ( Address of principal executive offices ) ( 408 ) 470-1000 ( Registrant's telephone number , including area code ) Securities registered pursuant to Section 12 ( b ) of the Act : Trading Symbol ALGN 94-3267295 ( I.R.S. Employer Identification Number ) 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 > NO □ Name of each exchange on which registered The NASDAQ Stock Market LLC ( NASDAQ Global Market ) Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15 ( d ) of the Exchange Act . Yes No 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 ( §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 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 definitions of “ large accelerated filer , ” “ accelerated filer , ” “ smaller reporting company , " and " emerging growth company " in Rule 12b - 2 of the Exchange Act . ( Check one ) : 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 revised financial accounting standards provided pursuant to Section 7 ( a ) ( 2 ) ( B ) of the Securities Act . On February 22 , 2021 , 79,132,723 shares of the registrant's common stock were outstanding . DOCUMENTS INCORPORATED BY REFERENCE for complyin with any new or 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 . No 风 Indicate by check mark whether the registrant is a shell company ( as defined in Rule 12b - 2 of the Exchange Act ) . Yes The aggregate market value of the registrant's common stock held by non - affiliates of the registrant was approximately $ 14.5 billion as of June 30 , 2020 based on the closing sale price of the registrant's common stock on the NASDAQ Global Market on such date . Shares held by persons who may be deemed affiliates have been excluded . This determination of affiliate status is not necessarily a conclusive determination for other purposes . Portions of the registrant's definitive Proxy Statement relating to its 2021 Annual Stockholders ' Meeting to be filed pursuant to Regulation 14A within 120 days after the registrant's fiscal year end of December 31 , 2020 are incorporated by reference into Part III of this Annual Report on Form 10 - K .