X0206 3 2020-06-11 0 0001782754 AZEK Co Inc. AZEK 0000937567 ONTARIO TEACHERS PENSION PLAN BOARD 5650 YONGE STREET, NORTH YORK TORONTO A6 M2M 4H5 ONTARIO, CANADA 1 0 1 0 Class A common stock, par value $0.001 20243944 D Class B common stock, par value $0.001 33068963 D Ontario Teachers' Pension Plan Board ("OTPP") may, at any time, elect to (a) convert shares of Class B common stock into an equal number of shares of Class A common stock, or (b) convert shares of Class A common stock into an equal number of shares of Class B common stock so long as OTPP holds Class B common stock. The table above does not reflect (i) shares of Class B common stock issuable upon conversion of Class A common stock or (ii) shares of Class A common stock issuable upon conversion of Class B common stock. The reported securities are owned by OTPP. Each of Mr. Blake Sumler, Mr. Ashfaq Qadri, and Mr. Russell Hammond may be deemed to have power to dispose of the shares held by OTPP because of a delegation of authority from the Board of Directors of OTPP, and each expressly disclaims beneficial ownership of such shares. OTPP has the right to nominate directors for election to the board of directors of the Issuer pursuant to a stockholders agreement, dated June 11, 2020. OTPP has nominated three directors to the Issuer's board of directors. Accordingly, OTPP may be deemed to be a director by deputization. /s/ Rossana Di Lieto, Senior Managing Director, Chief Compliance Officer & Associate General Counsel 2020-06-11