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Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington , D.C. 20549 FORM 10 - K ( Mark One ) ANNUAL REPORT PURSUANT TO SECTION 13 OR 15 ( d ) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31 , 2020 Or TRANSITION REPORT PURSUANT TO SECTION 13 OR 15 ( d ) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from CASELLA WASTE SYSTEMS , INC . ( Exact name of registrant as specified in its charter ) Delaware ( State or other jurisdiction of incorporation or organization ) 25 Greens Hill Lane , Rutland , VT ( Address of principal executive offices ) to Commission file number 000-23211 Title of each class Class A common stock , $ 0.01 par value per share Registrant's telephone number , including area code : ( 802 ) 775-0325 Securities registered pursuant to Section 12 ( b ) of the Act : 03-0338873 ( I.R.S. Employer Identification No. ) Trading Symbol ( s ) CWST 05701 ( Zip Code ) Name of each exchange on which registered The Nasdaq Stock Market LLC ( Nasdaq Global Select Market ) Securities registered pursuant to Section 12 ( g ) of the Act : None . No □ No | Indicate by check mark if the registrant is a well - known seasoned issuer , as defined in Rule 405 of the Securities Act . Yes 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 Indicate by checkmark 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 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 Accelerated filer Smaller reporting company Emerging growth company 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 Act . Indicate by check mark whether the registrant has filed a report 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 Exchange Act ) . Yes No | The aggregate market value of the common equity held by non - affiliates of the registrant , based on the last reported sale price of the registrant's Class A common stock on the Nasdaq Stock Market at the close of business on June 30 , 2020 was approximately $ 2,396 million . The registrant does not have any non - voting common stock outstanding . There were 50,101,351 shares of Class A common stock , $ 0.01 par value per share , of the registrant outstanding at February 15 , 2021. There were 988,200 shares of Class B common stock , $ 0.01 par value per share , of the registrant outstanding at February 15 , 2021 . Documents Incorporated by Reference Part III of this Annual Report on Form 10 - K incorporates by reference information from the definitive Proxy Statement for the registrant's 2021 Annual Meeting of Stockholders or a Form 10 - K / A to be filed with the Securities and Exchange Commission not later than 120 days after the registrant's fiscal year ended December 31 , 2020 .