Sec Form 4 Filing - Hendrickson Gary E @ AZEK Co Inc. - 2025-07-01

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 Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person Hendrickson Gary E 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 _____ 10% Owner _____ Officer (give title below) _____ Other (specify below) (Last) (First) (Middle) 1330 W. FULTON ST., SUITE 350 3. Date of Earliest Transaction (MM/DD/YY) 07/01/2025 (Street) CHICAGO, IL60607 4. If Amendment, Date Original Filed (MM/DD/YY) 6. Individual or Joint/Group Filing (Check Applicable Line) __ X __ Form filed by One Reporting Person _____ Form filed by More than One Reporting Person (City) (State) (Zip)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned 1.Title of Security (Instr. 3) 2. Transaction Date (MM/DD/YY) 2A. Deemed Execution Date, if any (MM/DD/YY) 3. Transaction 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 07/01/2025 D 214,105 ( 1 ) D 0 D Class A Common Stock 07/01/2025 D 140,892 ( 1 ) D 0 I By Trust Class A Common Stock 07/01/2025 D 21,356 ( 1 ) ( 4 ) D 0 D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned ( e.g. , puts, calls, warrants, options, convertible securities) 1. Title of Derivative Security (Instr. 3) 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (MM/DD/YY) 3A. Deemed Execution Date, if any (MM/DD/YY) 4. Transaction 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 (MM/DD/YY) 7. Title and Amount of Underlying Securities (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 Non-qualified stock options (right-to-buy) $ 23 07/01/2025 D 564,439 ( 1 ) ( 5 )( 6 ) 06/16/2030 Common Stock 564,439 ( 5 ) ( 6 ) 0 D

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other Hendrickson Gary E 1330 W. FULTON ST. SUITE 350 CHICAGO, IL60607 X Signatures /s/ Morgan Walbridge, as Attorney-in-Fact for Gary Hendrickson 07/02/2025 Signature of Reporting Person Date

Explanation of Responses:

( 1 )Represents shares (including in respect of shares underlying, as applicable, Company RSU Awards, Company PSU Awards and Company Stock Options (each as defined in the Agreement and Plan of Merger, dated as of March 23, 2025 (as amended, the "Merger Agreement"), by and among The AZEK Company Inc. ("AZEK"), James Hardie Industries plc ("JHX") and Juno Merger Sub Inc.)) disposed of pursuant to the closing of the transactions contemplated by the Merger Agreement. ( 2 )In accordance with the Merger Agreement, upon the Effective Time (as defined in the Merger Agreement), each share of Company Common Stock (as defined in the Merger Agreement) that was issued and outstanding immediately prior to the Effective Time (subject to certain exceptions) was converted into the right to receive $26.45 in cash, without interest (the "Cash Consideration"), and 1.0340 (the "Exchange Ratio") JHX ordinary shares, with cash in lieu of fractional JHX ordinary shares, where any such aggregated fractional shares are rounded to four (4) decimal places and multiplied by JHX's five-trading day volume-weighted average price ending on June 30, 2025, the trading day immediately prior to the closing of the transactions contemplated by the Merger Agreement (the "Parent Share Price") (collectively, the "Merger Consideration"). The Parent Share Price was $26.053018. ( 3 )Upon the Effective Time, each then-outstanding Company RSU Award held by the reporting person was fully vested and canceled in exchange for the right to receive the Merger Consideration. ( 4 )In connection with the closing of the merger, the deferred stock units held by the reporting person as of immediately prior to the Effective Time were settled and immediately cancelled in exchange for the Merger Consideration. ( 5 )Upon the Effective Time, each then-outstanding Company Stock Option held by the reporting person was assumed by JHX and converted into an option to purchase a number of JHX ordinary shares (rounded down to the nearest whole number of shares) equal to the product of (A) the number of shares of Company Common Stock subject to such Company Stock Option multiplied by (B) the Equity Award Exchange Ratio, with an exercise price per JHX ordinary share equal to the quotient (rounded up to the nearest whole cent) obtained by dividing (A) the exercise price per share of Company Common Stock subject to such Company Stock Option by (B) the Equity Award Exchange Ratio. The Equity Award Exchange Ratio is defined as the sum of (A) the quotient (rounded to four (4) decimal places) obtained by dividing (x) the Cash Consideration by (y) the Parent Share Price and (B) the Exchange Ratio. ( 6 )(Continued from footnote 5) Each stock option of JHX is subject to the same terms and conditions as were applicable to such Company Stock Option immediately prior to the Effective Time, including the vesting schedule.

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.

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