X0306 4 2021-05-18 0 0001782754 AZEK Co Inc. AZEK 0001234014 BAILEY SALLIE B 1330 W. FULTON STREET SUITE 350 CHICAGO IL 60607 1 0 0 0 Class A Common Stock 2021-05-18 4 M 0 1903 0.00 A 61629 D Class A Common Stock 2021-05-18 4 A 0 1982 0.00 A 63611 D Restricted Stock Units (RSUs) 2021-05-18 4 M 0 1903 0.00 D Common Stock 1903 4566 D Vesting of previously awarded restricted stock units. Restricted stock units convert into common stock on a one-for-one basis. Grant of time-vesting restricted stock units made to directors on May 18, 2021 pursuant to Rule 16b-3(d) plan that will vest on the earlier of (x) the one-year anniversary of the date of grant and (y) the Issuer's next annual stockholder meeting. Includes (i) 1,982 restricted stock units that vest on the earlier of (x) the one-year anniversary of the date of grant and (y) the Issuer's next annual stockholder meeting and (ii) 4,566 restricted stock units that will vest on June 16, 2023 subject to continued service through the vesting date. On June 16, 2020, the Reporting Person was granted 1,903 restricted stock units that vested on the earlier of (x) the one-year anniversary of the date of grant and (y) the Issuer's annual stockholder meeting for the following year. /s/ Morgan Fox Walbridge, as Attorney-in-Fact for Sallie Bailey 2021-05-20