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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 September 30 , 2021 OR TRANSITION REPORT PURSUANT TO SECTION 13 OR 15 ( d ) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to The AZEK Company Inc. ( Exact name of Registrant as specified in its Charter ) Delaware ( State or other jurisdiction of incorporation or organization ) Commission File Number 001-39322 1330 W Fulton Street , Suite 350 , Chicago , Illinois ( Address of principal executive offices ) Title of each class Class A Common Stock , par value $ 0.001 per share Large accelerated filer Non - accelerated filer 90-1017663 ( I.R.S. Employer Identification No. ) 60607 ( Zip Code ) Registrant's telephone number , including area code : ( 877 ) 275-2935 Securities registered pursuant to Section 12 ( b ) of the Act : Trading Symbol AZEK Securities registered pursuant to Section 12 ( g ) of the Act : Indicate by check mark if the Registrant is a well - known seasoned issuer , as defined in Rule 405 of the Securities Act . YES NO Indicate by check mark if the Registrant is not required to file reports pursuant to Section 13 or 15 ( d ) of the 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 Name of each exchange on which registered The 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 > NO Indicate by check mark whether the registrant is a large accelerated filer , an accelerated filer , a non - accelerated filer , 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 . 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 Exchange Act . 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 Exchange Act ) . YES NO The aggregate market value of the registrant's voting common equity held by non - affiliates of the registrant at March 31 , 2021 ( the last day of the registrant's most recent second quarter ) was $ 3,977,124,322 based on the closing price of the registrant's Class A common stock as reported on the New York Stock Exchange on such date . As of October 29 , 2021 , the registrant had 154,876,313 shares of Class A Common Stock , $ 0.001 par value per share , and 100 shares of Class B Common Stock , $ 0.001 par value per share , outstanding . Portions of the registrant's definitive proxy statement for its 2022 Annual Meeting of Stockholders to be filed with the Securities and Exchange Commission within 120 days after the end of the fiscal year ended September 30 , 2021 are incorporated by reference into Part III of this Annual Report on Form 10 - K .