X0306 5 2021-09-30 0 0 0 0001782754 AZEK Co Inc. AZEK 0001331749 Hendrickson Gary E 1330 W. FULTON STREET SUITE 350 CHICAGO IL 60607 1 0 0 0 Class A common stock 2021-01-27 5 G 0 140892 0.00 D 159549 D Class A common stock 2021-01-27 5 G 0 140892 0.00 A 140892 I By Trust Class A common stock 2021-03-04 5 G 0 140892 0.00 D 0 I By Trust Class A common stock 2021-03-04 5 G 0 140892 0.00 A 140892 I By Trust Represents shares transferred by the Reporting Person to The Gary E. Hendrickson Trust for estate planning purposes. The Reporting Person serves as the trustee of the trust. Represents shares transferred by the Reporting Person, as trustee of The Gary E. Hendrickson Trust, to The Hendrickson Family Trust for estate planning purposes. The Reporting Person's spouse serves as the trustee of The Hendrickson Family Trust and has delegated to the Reporting Person investment control and management of trust property. /s/ Morgan Walbridge, as Attorney-in-Fact for Gary Hendrickson 2021-11-15