X0306 4 2021-04-23 0 0001782754 AZEK Co Inc. AZEK 0001192519 NICOLETTI RALPH J 1330 W. FULTON STREET SUITE 350 CHICAGO IL 60607 0 1 0 0 CFO Class A Common Stock 2021-04-23 4 S 0 4622 49.50 D 377039 D Class A Common Stock 2021-04-26 4 S 0 15063 50.00 D 361976 D The sale of shares reported on this Form 4 was effected pursuant to a Rule 10-b(5)-1 trading plan adopted by the Reporting Person on January 22, 2021. Includes 139,304 restricted shares of the Issuer's Class A common stock that will vest in equal installments on January 9, 2022, 2023 and 2024 and 3,101 restricted stock units that will vest in equal installments on December 4, 2021, 2022 and 2023. /s/ Paul J. Kardish, as attorney-in-fact for Ralph J. Nicoletti 2021-04-27