Statement of Changes in Beneficial Ownership (4)

FORM 4

[ ] Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES

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3235-0287

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Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934 or Section 30(h) of the Investment Company Act of 1940

1. Name and Address of Reporting Person * ONTARIO TEACHERS PENSION PLAN BOARD	2. Issuer Name and Ticker or Trading Symbol AZEK Co Inc. [ AZEK ]	5. Relationship of Reporting Person(s) to Issuer (Check all applicable) __X__ Director                    __X__ 10% Owner _____ Officer (give title below)    _____ Other (specify below)
(Last)          (First)          (Middle) 5650 YONGE STREET, 3RD FLOOR	3. Date of Earliest Transaction (MM/DD/YYYY) 9/15/2020
(Street) TORONTO, A6 M2M 4H5 (City)        (State)        (Zip)	4. If Amendment, Date Original Filed (MM/DD/YYYY)	6. Individual or Joint/Group Filing (Check Applicable Line) _X _ Form filed by One Reporting Person ___ Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1.Title of Security (Instr. 3)	2. Trans. Date	2A. Deemed Execution Date, if any	3. Trans. Code (Instr. 8)		4. Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Class A Common Stock, par value $0.01 per share	9/15/2020		S		14091817	D	$32.2525	6152127 (1)	D
Class A Common Stock, par value $0.01 per share	9/15/2020		M		33068863	A	(2)	39220990 (1)	D

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivate Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Trans. Date	3A. Deemed Execution Date, if any	4. Trans. Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares
Class B Common Stock	(1)	9/15/2020		M			33068863	(2)	(2)	Class A Common Stock, par value $0.01 per share	33068863	(2)	100 (1)	D

Explanation of Responses:
(1)	The reported securities are owned by Ontario Teachers' Pension Plan Board ("OTPP"). Each of Mr. Blake Sumler, Mr. Ashfaq Qadri, and Mr. Russell Hammond may be deemed to have power to dispose of or convert 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.
(2)	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.

Reporting Owners
Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
ONTARIO TEACHERS PENSION PLAN BOARD 5650 YONGE STREET 3RD FLOOR TORONTO, A6 M2M 4H5	X	X

Signatures
/s/ Rossana Di Lieto, Senior Managing Director, Chief Compliance Officer & Associate General Counsel		9/15/2020
**Signature of Reporting Person		Date