Sec Form 4 Filing - Sullivan James A. @ Koppers Holdings Inc. - 2024-01-04

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 Sullivan James A. 2. Issuer Name and Ticker or Trading Symbol Koppers Holdings Inc. [ KOP] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director _____ 10% Owner X __ Officer (give title below) _____ Other (specify below) President and COO (Last) (First) (Middle) 436 SEVENTH AVENUE 3. Date of Earliest Transaction (MM/DD/YY) 01/04/2024 (Street) PITTSBURGH, PA15219 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 Common Stock ( 1 ) 01/04/2024 A 12,531 A $ 0 107,316.738 D Common Stock 01/05/2024 M 15,868 A 123,184.738 D Common Stock 01/05/2024 M 301 ( 3 ) A $ 0 ( 3 ) 123,485.738 D Common Stock 01/05/2024 F 11,232 D ( 4 ) $ 47.32 112,253.738 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 Restricted Stock Units ( 2 ) 01/04/2024 A 8,077 ( 5 ) ( 5 ) Common Stock 8,077 $ 0 15,868 D Restricted Stock Units ( 2 ) 01/04/2024 A 8,645 ( 6 ) ( 6 ) Common Stock 8,645 $ 0 10,581 D Restricted Stock Units ( 2 ) 01/04/2024 A 5,530 ( 7 ) ( 7 ) Common Stock 5,530 $ 0 5,530 D Dividend Equivalent Rights ( 8 ) 01/04/2024 A 263 ( 8 ) ( 8 ) Common Stock 263 $ 0 660 D Restricted Stock Units ( 2 ) 01/05/2024 M 15,868 ( 9 ) ( 9 ) Common Stock 15,868 $ 0 0 D Dividend Equivalent Rights ( 10 ) 01/05/2024 M 301 ( 10 ) ( 10 ) ( 10 ) Common Stock 301 $ 0 359 D

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other Sullivan James A. 436 SEVENTH AVENUE PITTSBURGH, PA15219 President and COO Signatures /s/Stephanie L. Apostolou, Attorney in Fact 01/08/2024 Signature of Reporting Person Date

Explanation of Responses:

( 1 )The reporting person was awarded time-based restricted stock units on January 4, 2024, which will vest in annual installments of one-third each over three years. ( 2 )Restricted stock units convert into common stock on a one-for-one basis. ( 3 )Represents shares acquired upon release of dividend equivalent rights ("DERs"), as reported in Table II, on a one-for-one basis. ( 4 )Shares surrendered to the issuer by the reporting person as payment for the tax withholding related to the vesting of time-based restricted stock units ("RSUs") and performance share units ("PSUs"). ( 5 )On January 4, 2021, the reporting person was granted PSUs for which the performance criteria for the three-year performance period from January 1, 2021 through December 31, 2023 have been satisfied. ( 6 )On January 4, 2022, the reporting person was granted PSUs for which the performance criteria for the two-year performance period from January 1, 2022 through December 31, 2023 have been satisfied. All of the restricted stock units reported here are subject to vesting based on the continued service of the reporting person through January 5, 2025. If the Company's total shareholder return over the three-year period of January 1, 2022 through December 31, 2024 is negative, then the cumulative number of units that may vest for such three-year period will be capped at 150% of the target number. ( 7 )On January 4, 2023, the reporting person was granted PSUs for which the performance criteria for the one-year performance period from January 1, 2023 through December 31, 2023 have been satisfied. All of the restricted stock units reported here are subject to vesting based on the continued service of the reporting person through January 5, 2026. If the Company's total shareholder return over the three-year period of January 1, 2023 through December 31, 2025 is negative, then the cumulative number of units that may vest for such three-year period will be capped at 150% of the target number. ( 8 )The DERs accrued with respect to additional PSUs credited to the reporting person with respect to PSUs granted on January 4, 2021, January 4, 2022, and January 4, 2023. Each DER is the economic equivalent of one share of Koppers Holdings Inc. common stock. ( 9 )Represents previously granted performance share units for which the performance criteria for the three-year performance period from January 1, 2021 through December 31, 2023 have been satisfied, as reported in Table II above. ( 10 )These DERs were released in connection with the vesting of RSUs and PSUs granted on January 4, 2021, January 4, 2022, and January 4, 2023. Each DER is the economic equivalent of one share of Koppers Holdings Inc. common stock.

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