KOP / Koppers Holdings Inc. - Pengajuan SECLaporan Tahunan, Pernyataan Proksi

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q (Mark One) ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2025 ☐ TRANSITION REPORT PU

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q (Mark One) ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2025 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number 1-32737 KOPPERS HOLDI

Koppers Reports Second Quarter 2025 Results; REVISEs 2025 outlook

Exhibit 99.1 News Release FOR IMMEDIATE RELEASE For Information: Quynh McGuire Vice President, Investor Relations 412 227 2049 [email protected] Koppers Holdings Inc. 436 Seventh Avenue Pittsburgh, PA 15219-1800 Tel 412 227 2001 www.koppers.com Koppers Reports Second Quarter 2025 Results; REVISEs 2025 outlook • Sales of $504.8 Million vs. $563.2 Million in Prior Year Quarter • Net income attri

FORM 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): August 08, 2025 KOPPERS HOLDINGS INC. (Exact name of registrant as specified in its charter) Pennsylvania 1-32737 20-1878963 (State or other jurisdiction of incorporation) (Commission

Exhibit 99.1

Exhibit 99.1 Koppers Holdings Inc. 436 Seventh Avenue Pittsburgh, PA 15219-1800 Tel 412 227 2001 www.koppers.com News Release FOR IMMEDIATE RELEASE For Information: Quynh McGuire, Vice President, Investor Relations 412 227 2049 [email protected] Koppers Extends Revolving Credit Facility Maturity Date to 2030 PITTSBURGH, June 18, 2025 – Koppers Holdings Inc. (NYSE: KOP), an integrated global pr

FORM 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): June 17, 2025 KOPPERS HOLDINGS INC. (Exact name of registrant as specified in its charter) Pennsylvania 1-32737 20-1878963 (State or other jurisdiction of incorporation) (Commission F

Amendment No. 6, dated as of June 17, 2025, to the Credit Agreement, dated as of June 17, 2022, by and among Koppers Inc., as Borrower, Koppers Holdings Inc., as Holdings, the Lenders and L/C issuers party thereto, PNC Bank, National Association, as Revolving Administrative Agent, Collateral Agent and Swingline Loan Lender, and Wells Fargo Bank, National Association, as Term Administrative Agent.

Exhibit 10.1 Execution Version AMENDMENT NO. 6 AMENDMENT NO. 6, dated as of June 17, 2025 (this “Amendment”), to the Credit Agreement, dated as of June 17, 2022 (as amended by Amendment No. 1, dated as of April 10, 2023, as amended by Amendment No. 2, dated as of October 11, 2023, as amended by Amendment No. 3, dated as of April 12, 2024, as amended by Amendment No. 4, dated as of April 22, 2024,

Exhibit 99.1

Exhibit 99.1 Koppers Holdings Inc. 436 Seventh Avenue Pittsburgh, PA 15219-1800 Tel 412 227 2001 www.koppers.com News Release FOR IMMEDIATE RELEASE For Information: Quynh McGuire, Vice President, Investor Relations 412 227 2049 [email protected] Koppers Names James A. Sullivan President and Chief Transformation Officer; New Role Created to Oversee Company-wide Catalyst Initiative PITTSBURGH, P

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): May 22, 2025 KOPPERS HOLDINGS INC. (Exact name of registrant as specified in its charter) Pennsylvania 1-32737 20-1878963 (State or other jurisdiction of incorporation) (Commission Fi

Filing Fee Table (filed herewith).

Exhibit 107 Calculation of Filing Fee Table Form S-8 (Form Type) Koppers Holdings Inc.

Koppers Reports First Quarter 2025 Results; Maintains 2025 outlook for adjusted ebitda and eps

Exhibit 99.1 News Release FOR IMMEDIATE RELEASE For Information: Quynh McGuire Vice President, Investor Relations 412 227 2049 [email protected] Koppers Holdings Inc. 436 Seventh Avenue Pittsburgh, PA 15219-1800 Tel 412 227 2001 www.koppers.com Koppers Reports First Quarter 2025 Results; Maintains 2025 outlook for adjusted ebitda and eps • Sales of $456.5 Million vs. $497.6 Million in Prior Ye

Koppers Holdings Inc. Amended and Restated 2020 Long Term Incentive Plan (filed herewith).

Exhibit 99.1 KOPPERS HOLDINGS INC. AMENDED AND RESTATED 2020 LONG TERM INCENTIVE PLAN as amended and restated effective March 17, 2025 Section 1. Purpose The purposes of the Koppers Holdings Inc. Amended and Restated 2020 Long Term Incentive Plan (the “Plan”) are to encourage selected individuals in the service of Koppers Holdings Inc. (together with any successor thereto, the “Company”) and its A

FORM 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): May 08, 2025 KOPPERS HOLDINGS INC. (Exact name of registrant as specified in its charter) Pennsylvania 1-32737 20-1878963 (State or other jurisdiction of incorporation) (Commission Fi

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q (Mark One) ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2025 ☐ TRANSITION REPORT P

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q (Mark One) ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2025 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number 1-32737 KOPPERS HOLD

Koppers Inc. Annual Incentive Plan, as amended and restated effective February 12, 2025.

Exhibit 10.1 Koppers Inc. Annual Incentive Plan As amended and restated effective February 12, 2025 The purpose of the Koppers Inc. Annual Incentive Plan (the “Plan”) is to enhance the ability of Koppers Inc. (the “Company”) to provide incentive compensation to Employees to attract, motivate and retain Employees, stimulate Employees to use their innate creativity and entrepreneurial thinking in ca

Koppers Holdings Inc. Amended and Restated 2020 Long Term Incentive Plan (Incorporated herein by reference to Exhibit 99.1 to the Registration Statement on Form S-8 filed on May 9, 2025 by Koppers Holdings Inc. (File No. 333-287117)

Registration No. 333- As filed with the Securities and Exchange Commission on May 9, 2025 UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM S-8 REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933   Koppers Holdings Inc. (Exact name of registrant as specified in its charter) Pennsylvania 20-1878963 (State or other jurisdiction of incorporation or organization) (I.R.S. E

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No.  )

DEFA14A UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No.  ) Filed by the Registrant ☒       Filed by a Party other than the Registrant ☐ Check the appropriate box: ☐ Preliminary Proxy Statement ☐ Confidential, for Use of the Commission Only (as permitted by Rule 14a-6

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. )

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. ) Filed by the Registrant ☒ Filed by a Party other than the Registrant ☐ Check the appropriate box: ☐ Preliminary Proxy Statement ☐ Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) ☒ Defin

Letter Agreement with Stephen G. Lucas

Exhibit 10.54 December 5, 2024 Stephen Lucas [REDACTED] [REDACTED] Dear Stephen, We are pleased to offer you $80,000, less all applicable deductions and withholdings, as allowance for living expenses for calendar year 2025. If you voluntarily resign from employment with the Company, or if the Company terminates your employment for cause (as determined by the Company in its reasonable discretion),

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-K (Mark One) ☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2024 ☐ TRANSITION REPORT PURSUA

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-K (Mark One) ☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2024 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number 1-32737 KOPPERS HOLDINGS

Koppers Reports Fourth Quarter and Full-Year 2024 Results; Provides 2025 Outlook Fourth-Quarter Sales of $477.0 Million vs. $513.2 Million in Prior Year Quarter Full-Year Sales of $2.09 Billion vs. $2.15 Billion in Prior Year

Exhibit 99.1 Koppers Holdings Inc. 436 Seventh Avenue Pittsburgh, PA 15219-1800 Tel 412 227 2001 www.koppers.com News Release FOR IMMEDIATE RELEASE For Information: Quynh McGuire, Vice President, Investor Relations 412 227 2049 [email protected] Koppers Reports Fourth Quarter and Full-Year 2024 Results; Provides 2025 Outlook Fourth-Quarter Sales of $477.0 Million vs. $513.2 Million in Prior Ye

Description of Registrant’s Securities Registered Pursuant to Section 12 of the Securities Exchange Act of 1934

Exhibit 4.1 DESCRIPTION OF THE REGISTRANT'S SECURITIES REGISTERED PURSUANT TO SECTION 12 OF THE SECURITIES EXCHANGE ACT OF 1934 The following description sets forth certain material terms and provisions of the securities of Koppers Holdings Inc. (the “Company”) that are registered under Section 12 of the Securities Exchange Act of 1934, as amended. This description also summarizes certain relevant

Form of Restricted Stock Unit Issuance Agreement - EBITDA Performance Vesting

Exhibit 10.50 General LTIP Participants KOPPERS HOLDINGS INC. RESTRICTED STOCK UNIT ISSUANCE AGREEMENT- ebitda Performance vesting RECITALS A. The Board has adopted the Plan for the purpose of retaining the services of selected Employees, non-employee members of the Board (or the board of directors of any Affiliate) and consultants who provide services to the Corporation (or any Affiliate). B. Par

Form of Restricted Stock Unit Issuance Agreement - Rollover - Time Vesting

Exhibit 10.52 General LTIP Participants – Rollover Award KOPPERS HOLDINGS INC. RESTRICTED STOCK UNIT ISSUANCE AGREEMENT – TIME VESTING RECITALS A. The Board has adopted the Plan for the purpose of retaining the services of selected Employees, non-employee members of the Board (or the board of directors of any Affiliate) and consultants who provide services to the Corporation (or any Affiliate). B.

Insider Trading and Securities Compliance Policy

Exhibit 19 Policy – Koppers Securities Insider Trading and Securities Compliance Effective Date: 2/24/2023 Purpose: It is important for all employees – and especially employees who are also stockholders – to become familiar with the rules concerning insider trading and securities compliance.

Form of Restricted Stock Unit Issuance Agreement - Rollover - TSR Performance Vesting

Exhibit 10.53 General LTIP Participants – Rollover Award KOPPERS HOLDINGS INC. RESTRICTED STOCK UNIT ISSUANCE AGREEMENT- TSR Performance vesting RECITALS A. The Board has adopted the Plan for the purpose of retaining the services of selected Employees, non-employee members of the Board (or the board of directors of any Affiliate) and consultants who provide services to the Corporation (or any Affi

Powers of Attorney.

Exhibit 24 KOPPERS HOLDINGS INC. POWER OF ATTORNEY (10-K) I, Stephen R. Tritch, a Director of Koppers Holdings Inc. (the “Corporation”), a Pennsylvania corporation, hereby constitute and appoint Leroy M. Ball, Jimmi Sue Smith and Bradley A. Pearce, or any of them, my true and lawful attorneys or attorneys-in-fact, with the full power of substitution and revocation, (i) to sign, in my name and on m

Form of Restricted Stock Unit Issuance Agreement - Time Vesting

Exhibit 10.49 General LTIP Participants KOPPERS HOLDINGS INC. RESTRICTED STOCK UNIT ISSUANCE AGREEMENT – TIME VESTING RECITALS A. The Board has adopted the Plan for the purpose of retaining the services of selected Employees, non-employee members of the Board (or the board of directors of any Affiliate) and consultants who provide services to the Corporation (or any Affiliate). B. Participant is t

Form of Restricted Stock Unit Issuance Agreement - TSR Performance Vesting

Exhibit 10.51 General LTIP Participants KOPPERS HOLDINGS INC. RESTRICTED STOCK UNIT ISSUANCE AGREEMENT- TSR Performance vesting RECITALS A. The Board has adopted the Plan for the purpose of retaining the services of selected Employees, non-employee members of the Board (or the board of directors of any Affiliate) and consultants who provide services to the Corporation (or any Affiliate). B. Partic

Subsidiaries of the Company.

Exhibit 21 KOPPERS HOLDINGS INC. SUBSIDIARIES OF THE COMPANY Name* Jurisdiction of Incorporation/Formation Koppers Inc. Pennsylvania Cox Wood of Alabama, LLC Alabama Koppers Delaware, Inc. Delaware Koppers World-Wide Ventures Corporation Delaware Koppers Ventures Inc. Delaware Koppers Railroad Structures Inc. Delaware Koppers Recovery Resources LLC Kansas Koppers Performance Chemicals Inc. New Yor

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): February 27, 2025 KOPPERS HOLDINGS INC. (Exact name of registrant as specified in its charter) Pennsylvania 1-32737 20-1878963 (State or other jurisdiction of incorporation) (Commissi

Koppers Successfully Reprices Term Loan B Reduces Interest Rate Margins by 50 Basis Points

Exhibit 99.1       Koppers Holdings Inc. 436 Seventh Avenue Pittsburgh, PA 15219-1800 Tel 412 227 2001 www.koppers.com News Release FOR IMMEDIATE RELEASE For Information: Quynh McGuire, Vice President, Investor Relations          412 227 2049          [email protected] Koppers Successfully Reprices Term Loan B Reduces Interest Rate Margins by 50 Basis Points PITTSBURGH, December 17, 2024 – Kop

Amendment No. 5, dated as of December 17, 2024, to the Credit Agreement, dated as of June 17, 2022, by and among Koppers Inc., as Borrower, Koppers Holdings Inc., as Holdings, the Lenders and L/C issuers party thereto, PNC Bank, National Association, as Revolving Administrative Agent, Collateral Agent and Swingline Loan Lender, and Wells Fargo Bank, National Association, as Term Administrative Agent

Exhibit 10.1 Execution Version AMENDMENT NO. 5 AMENDMENT NO. 5, dated as of December 17, 2024 (this “Amendment”), to the Credit Agreement, dated as of June 17, 2022 (as amended by Amendment No. 1, dated as of April 10, 2023, as amended by Amendment No. 2, dated as of October 11, 2023, as amended by Amendment No. 3, dated as of April 12, 2024, as amended by Amendment No. 4, dated as of April 22, 20

Entry into a Material Definitive Agreement, Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): December 17, 2024 KOPPERS HOLDINGS INC. (Exact name of Registrant as Specified in Its Charter) Pennsylvania 1-32737 20-1878963 (State or Other Jurisdiction of Incorporation) (Commissi

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): December 05, 2024 KOPPERS HOLDINGS INC. (Exact name of Registrant as Specified in Its Charter) Pennsylvania 1-32737 20-1878963 (State or Other Jurisdiction of Incorporation) (Commissi

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): December 05, 2024 KOPPERS HOLDINGS INC. (Exact name of Registrant as Specified in Its Charter) Pennsylvania 1-32737 20-1878963 (State or Other Jurisdiction of Incorporation) (Commissi

Koppers Ceasing Phthalic Anhydride Operations at Stickney Facility Consistent with Strategy to Optimize Business Portfolio and Enhance Free Cash Flow

Exhibit 99.1 Koppers Holdings Inc. 436 Seventh Avenue Pittsburgh, PA 15219-1800 Tel 412 227 2001 www.koppers.com News Release FOR IMMEDIATE RELEASE For Information: Quynh McGuire, Vice President, Investor Relations 412 227 2049 [email protected] Koppers Ceasing Phthalic Anhydride Operations at Stickney Facility Consistent with Strategy to Optimize Business Portfolio and Enhance Free Cash Flow

Financial Statements and Exhibits, Costs Associated with Exit or Disposal Activities, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): November 08, 2024 KOPPERS HOLDINGS INC. (Exact name of registrant as specified in its charter) Pennsylvania 1-32737 20-1878963 (State or other jurisdiction of incorporation) (Commissi

Koppers Reports Third Quarter 2024 Results; Reaffirms 2024 Outlook Record Third Quarter Sales of $554.3 Million vs. $550.4 Million in Prior Year Quarter Third Quarter Diluted EPS of $1.09 vs. $1.22 in Prior Year Quarter Adjusted EPS of $1.37 vs. $1.3

Exhibit 99.1 Koppers Holdings Inc. 436 Seventh Avenue Pittsburgh, PA 15219-1800 Tel 412 227 2001 www.koppers.com News Release FOR IMMEDIATE RELEASE For Information: Quynh McGuire, Vice President, Investor Relations 412 227 2049 [email protected] Koppers Reports Third Quarter 2024 Results; Reaffirms 2024 Outlook Record Third Quarter Sales of $554.3 Million vs. $550.4 Million in Prior Year Quart

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2024 Commission file number 1-32737

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2024 Commission file number 1-32737 KOPPERS HOLDINGS INC. (Exact name of registrant as specified in its charter) Pennsylvania 20-1878963 (State of incorporation) (IRS Employer Identific

Amendment No. 4 dated as of April 22, 2024, to the Credit Agreement, dated as of June 17, 2022, by and among Koppers Inc., as Borrower, Koppers Holdings Inc., as Holdings, the Lenders and L/C issuers party thereto, PNC Bank, National Association, as Revolving Administrative Agent, Collateral Agent and Swingline Loan Lender, and Wells Fargo Bank, National Association, as Term Administrative Agent.

Exhibit 10.2 Execution Version AMENDMENT NO. 4 AMENDMENT NO. 4, dated as of April 22, 2024 (this “Amendment”), to the Credit Agreement, dated as of June 17, 2022 (as amended by Amendment No. 1, dated as of April 10, 2023, as amended by Amendment No. 2, dated as of October 11, 2023, as amended by Amendment No. 3, dated as of April 12, 2024 and as further amended, supplemented, amended and restated

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): August 08, 2024 KOPPERS HOLDINGS INC. (Exact name of registrant as specified in its charter) Pennsylvania 1-32737 20-1878963 (State or other jurisdiction of incorporation) (Commission

Koppers Reports Second Quarter 2024 Results; Reaffirms 2024 Outlook Second Quarter Sales of $563.2 Million vs. $577.2 Million in Prior Year Quarter Second Quarter Diluted EPS of $1.25 vs. $1.15 in Prior Year Quarter Adjusted EPS of $1.36 vs. $1.26 in

Exhibit 99.1 Koppers Holdings Inc. 436 Seventh Avenue Pittsburgh, PA 15219-1800 Tel 412 227 2001 www.koppers.com News Release FOR IMMEDIATE RELEASE For Information: Quynh McGuire, Vice President, Investor Relations 412 227 2049 [email protected] Koppers Reports Second Quarter 2024 Results; Reaffirms 2024 Outlook Second Quarter Sales of $563.2 Million vs. $577.2 Million in Prior Year Quarter Se

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2024 Commission file number 1-32737 KOPP

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2024 Commission file number 1-32737 KOPPERS HOLDINGS INC. (Exact name of registrant as specified in its charter) Pennsylvania 20-1878963 (State of incorporation) (IRS Employer Identification

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2024 Commission file number 1-32737 KOP

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2024 Commission file number 1-32737 KOPPERS HOLDINGS INC. (Exact name of registrant as specified in its charter) Pennsylvania 20-1878963 (State of incorporation) (IRS Employer Identificatio

Amendments to Articles of Incorporation or Bylaws; Change in Fiscal Year, Financial Statements and Exhibits, Results of Operations and Financial Condition, Submission of Matters to a Vote of Security Holders

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): May 02, 2024 KOPPERS HOLDINGS INC. (Exact name of registrant as specified in its charter) Pennsylvania 1-32737 20-1878963 (State or other jurisdiction of incorporation) (Commission Fi

Amendment to Third Amended and Restated Bylaws of Koppers Holdings Inc., effective May 2, 2024

Exhibit 3.1 AMENDMENT TO THIRD AMENDED AND RESTATED BYLAWS OF Koppers Holdings Inc. (a Pennsylvania Corporation) May 2, 2024 This Amendment amends the provisions of the Third Amended and Restated Bylaws, as adopted on August 2, 2023 (the “Bylaws”), of Koppers Holdings Inc. (the “Company”). This Amendment was duly adopted by the Company’s shareholders at the Company’s annual meeting of shareholders

Third Amended and Restated Bylaws of Koppers Holdings Inc., as amended on May 2, 2024.

Exhibit 3.1 THIRD AMENDED AND RESTATED BYLAWS OF Koppers Holdings Inc. (a Pennsylvania Corporation) as amended May 2, 2024 Article I Offices and Fiscal Year Section 1.01. Registered Office Provider. The name of the registered office provider of the corporation and the county of venue is Corporation Service Company, Allegheny County, until otherwise established by an amendment of the articles of in

Koppers Reports First Quarter 2024 Results; Provides Updated 2024 Outlook Completed Acquisition of Brown Wood Preserving Company First Quarter Sales of $497.6 Million vs. $513.4 Million in Prior Year Quarter First Quarter Diluted EPS of $0.59 vs. $1.

Exhibit 99.1 Koppers Holdings Inc. 436 Seventh Avenue Pittsburgh, PA 15219-1800 Tel 412 227 2001 www.koppers.com News Release FOR IMMEDIATE RELEASE For Information: Quynh McGuire, Vice President, Investor Relations 412 227 2049 [email protected] Koppers Reports First Quarter 2024 Results; Provides Updated 2024 Outlook Completed Acquisition of Brown Wood Preserving Company First Quarter Sales o

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K/A (Amendment No. 1) CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): May 02, 2024 KOPPERS HOLDINGS INC. (Exact name of Registrant as Specified in Its Charter) Pennsylvania 1-32737 20-1878963 (State or Other Jurisdiction of Incorpora

Koppers Successfully Reprices and Upsizes Term Loan B Reduces Interest Rate Margins by 50 Basis Points Increases TLB by $100 Million

Exhibit 99.1     Koppers Holdings Inc. 436 Seventh Avenue Pittsburgh, PA 15219-1800 Tel 412 227 2001 www.koppers.com News Release FOR IMMEDIATE RELEASE For Information:  Quynh McGuire, Vice President, Investor Relations 412 227 2049 [email protected] Koppers Successfully Reprices and Upsizes Term Loan B Reduces Interest Rate Margins by 50 Basis Points Increases TLB by $100 Million PITTSBURGH,

Amendment No. 3, dated as of April 12, 2024, to the Credit Agreement, dated as of June 17, 2022, by and among Koppers Inc., as Borrower, Koppers Holdings Inc., as Holdings, the Lenders and L/C issuers party thereto, PNC Bank, National Association, as Revolving Administrative Agent, Collateral Agent and Swingline Loan Lender, and Wells Fargo Bank, National Association, as Term Administrative Agent

Exhibit 10.1 Execution Version AMENDMENT NO. 3 AMENDMENT NO. 3, dated as of April 12, 2024 (this “Amendment”), to the Credit Agreement, dated as of June 17, 2022 (as amended by Amendment No. 1, dated as of April 10, 2023, as amended by Amendment No. 2, dated as of October 11, 2023, and as further amended, supplemented, amended and restated or otherwise modified from time to time, the “Credit Agree

Entry into a Material Definitive Agreement, Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): April 12, 2024 KOPPERS HOLDINGS INC. (Exact name of Registrant as Specified in Its Charter) Pennsylvania 1-32737 20-1878963 (State or Other Jurisdiction of Incorporation) (Commission

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No.  )

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No.  ) Filed by the Registrant ☒       Filed by a Party other than the Registrant ☐ Check the appropriate box: ☐ Preliminary Proxy Statement ☐ Confidential, for Use of the Commission Only (as permitted by

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No.  )

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No.  ) Filed by the Registrant ☒       Filed by a Party other than the Registrant ☐ Check the appropriate box: ☒ Preliminary Proxy Statement ☐ Confidential, for Use of the Commission Only (as permitted by

Form of Restricted Stock Unit Issuance Agreement - Non-Employee Director - Time Vesting

Exhibit 10.46 KOPPERS HOLDINGS INC. RESTRICTED STOCK UNIT ISSUANCE AGREEMENT – TIME VESTING RECITALS A. The Board has adopted the Plan for the purpose of retaining the services of selected Employees, non-employee members of the Board (or the board of directors of any Affiliate) and consultants who provide services to the Corporation (or any Affiliate). B. Participant is to render valuable services

Form of Restricted Stock Unit Issuance Agreement - EBITDA Performance Vesting

Exhibit 10.44 KOPPERS HOLDINGS INC. RESTRICTED STOCK UNIT ISSUANCE AGREEMENT- ebitda Performance vesting RECITALS A. The Board has adopted the Plan for the purpose of retaining the services of selected Employees, non-employee members of the Board (or the board of directors of any Affiliate) and consultants who provide services to the Corporation (or any Affiliate). B. Participant is to render valu

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): February 28, 2024 KOPPERS HOLDINGS INC. (Exact name of registrant as specified in its charter) Pennsylvania 1-32737 20-1878963 (State or other jurisdiction of incorporation) (Commissi

Koppers Holdings Inc. Incentive-Based Compensation Recovery Policy

Exhibit 97 KOPPERS HOLDINGS INC. INCENTIVE-BASED COMPENSATION RECOVERY POLICY 1. Policy Purpose. The purpose of this Koppers Holdings Inc. (the “Company”) Incentive-Based Compensation Recovery Policy (this “Policy”) is to enable the Company to recover Erroneously Awarded Compensation in the event that the Company is required to prepare an Accounting Restatement. This Policy is intended to comply w

Form of Restricted Stock Unit Issuance Agreement - TSR Performance Vesting

Exhibit 10.45 KOPPERS HOLDINGS INC. RESTRICTED STOCK UNIT ISSUANCE AGREEMENT- TSR Performance vesting RECITALS A. The Board has adopted the Plan for the purpose of retaining the services of selected Employees, non-employee members of the Board (or the board of directors of any Affiliate) and consultants who provide services to the Corporation (or any Affiliate). B. Participant is to render valuabl

Subsidiaries of the Company.

Exhibit 21 KOPPERS HOLDINGS INC. SUBSIDIARIES OF THE COMPANY Name* Jurisdiction of Incorporation/Formation Koppers Inc. Pennsylvania Koppers Asia LLC Delaware Cox Wood of Alabama, LLC Alabama Koppers Delaware, Inc. Delaware Koppers World-Wide Ventures Corporation Delaware Koppers Ventures Inc. Delaware Koppers Railroad Structures Inc. Delaware Koppers Recovery Resources LLC Kansas Koppers Performa

Koppers Reports Fourth Quarter and Full-Year 2023 Results; Provides 2024 Outlook Record Fourth-Quarter Sales of $513.2 Million vs. $482.6 Million in Prior Year Quarter Record Year Sales of $2.15 Billion vs. $1.98 Billion in Prior Year Record Operatin

Exhibit 99.1 Koppers Holdings Inc. 436 Seventh Avenue Pittsburgh, PA 15219-1800 Tel 412 227 2001 www.koppers.com News Release FOR IMMEDIATE RELEASE For Information: Quynh McGuire, Vice President, Investor Relations 412 227 2049 [email protected] Koppers Reports Fourth Quarter and Full-Year 2023 Results; Provides 2024 Outlook Record Fourth-Quarter Sales of $513.2 Million vs. $482.6 Million in P

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-K ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2023 Commission file number 1-32737 KOPPERS

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-K ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2023 Commission file number 1-32737 KOPPERS HOLDINGS INC. (Exact name of registrant as specified in its charter) Pennsylvania 20-1878963 (State of incorporation) (IRS Employer Identification No.

Form of Restricted Stock Unit Issuance Agreement - Time Vesting

Exhibit 10.43 KOPPERS HOLDINGS INC. RESTRICTED STOCK UNIT ISSUANCE AGREEMENT – TIME VESTING RECITALS A. The Board has adopted the Plan for the purpose of retaining the services of selected Employees, non-employee members of the Board (or the board of directors of any Affiliate) and consultants who provide services to the Corporation (or any Affiliate). B. Participant is to render valuable services

Powers of Attorney.

Exhibit 24 KOPPERS HOLDINGS INC. POWER OF ATTORNEY (10-K) I, Stephen R. Tritch, a Director of Koppers Holdings Inc. (the “Corporation”), a Pennsylvania corporation, hereby constitute and appoint Leroy M. Ball, Jimmi Sue Smith and Bradley A. Pearce, or any of them, my true and lawful attorneys or attorneys-in-fact, with the full power of substitution and revocation, (i) to sign, in my name and on m

KOP / Koppers Holdings Inc. / VANGUARD GROUP INC - SCHEDULE 13G/A Passive Investment

SC 13G/A 1 tv01296-koppersholdingsinc.htm SCHEDULE 13G/A SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 13G Under the Securities Exchange Act of 1934 (Amendment No.: 5)* Name of issuer: Koppers Holdings Inc Title of Class of Securities: Common Stock CUSIP Number: 50060P106 Date of Event Which Requires Filing of this Statement: December 29, 2023 Check the appropriate box to desi

Koppers Holdings Names Nishan J. Vartanian to Board Company Expands Board of Directors from Nine to Ten Members

Exhibit 99.1 Koppers Holdings Inc. 436 Seventh Avenue Pittsburgh, PA 15219-1800 Tel 412 227 2001 www.koppers.com News Release FOR IMMEDIATE RELEASE For Information: Quynh McGuire, Vice President, Investor Relations 412 227 2049 [email protected] Koppers Holdings Names Nishan J. Vartanian to Board Company Expands Board of Directors from Nine to Ten Members PITTSBURGH, February 13, 2024 – Kopper

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): February 13, 2024 KOPPERS HOLDINGS INC. (Exact name of Registrant as Specified in Its Charter) Pennsylvania 1-32737 20-1878963 (State or Other Jurisdiction of Incorporation) (Commissi

KOP / Koppers Holdings Inc. / Rubric Capital Management LP - SC 13G/A Passive Investment

SC 13G/A 1 tm245464d10sc13ga.htm SC 13G/A SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G/A Under the Securities Exchange Act of 1934 (Amendment No. 2)* Koppers Holdings Inc. (Name of Issuer) Common Stock, $0.01 par value per share (Title of Class of Securities) 50060P106 (CUSIP Number) December 31, 2023 (Date of event which requires filing of this statement) Check the appro

KOP / Koppers Holdings Inc. / DIMENSIONAL FUND ADVISORS LP - SEC SCHEDULE 13G Passive Investment

SC 13G 1 SEC13GFiling.htm SEC SCHEDULE 13G UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. )* Koppers Holdings Inc (Name of Issuer) Common Stock (Title of Class of Securities) 50060P106 (CUSIP Number) December 29, 2023 (Date of Event Which Requires Filing of this Statement) Check the appropriate box to de

Koppers Names James A. Sullivan President and Chief Operating Officer

Exhibit 99.1 Koppers Holdings Inc. 436 Seventh Avenue Pittsburgh, PA 15219-1800 Tel 412 227 2001 www.koppers.com News Release FOR IMMEDIATE RELEASE For Information: Quynh McGuire, Vice President, Investor Relations 412 227 2049 [email protected] Koppers Names James A. Sullivan President and Chief Operating Officer PITTSBURGH, January 2, 2024 – Koppers Holdings Inc. (NYSE: KOP) today announced

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): January 01, 2024 KOPPERS HOLDINGS INC. (Exact name of Registrant as Specified in Its Charter) Pennsylvania 1-32737 20-1878963 (State or Other Jurisdiction of Incorporation) (Commissio

Amended and Restated Articles of Incorporation of Koppers Holdings Inc., as amended on August 3, 2023.

Exhibit 3.1 AMENDED AND RESTATED ARTICLES OF INCORPORATION OF KOPPERS HOLDINGS INC. (a Pennsylvania Corporation) as amended May 7, 2015August 3, 2023 ARTICLE I NAME Section 101. The name of the Corporation is Koppers Holdings Inc. ARTICLE II REGISTERED OFFICE Section 201. The name of the Corporation’s commercial registered office provider and the county of venue is Corporation Service Company, All

Koppers Reports Third Quarter 2023 Results; Reaffirms 2023 Outlook Third Quarter Record Sales of $550.4 Million vs. $536.1 Million in Prior Year Quarter Third Quarter Diluted EPS of $1.22 vs. $0.91 in Prior Year Quarter Third Quarter Adjusted EPS of

Exhibit 99.1 Koppers Holdings Inc. 436 Seventh Avenue Pittsburgh, PA 15219-1800 Tel 412 227 2001 www.koppers.com News Release FOR IMMEDIATE RELEASE For Information: Quynh McGuire, Vice President, Investor Relations 412 227 2049 [email protected] Koppers Reports Third Quarter 2023 Results; Reaffirms 2023 Outlook Third Quarter Record Sales of $550.4 Million vs. $536.1 Million in Prior Year Quart

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2023 Commission file number 1-32737

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2023 Commission file number 1-32737 KOPPERS HOLDINGS INC. (Exact name of registrant as specified in its charter) Pennsylvania 20-1878963 (State of incorporation) (IRS Employer Identific

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): November 03, 2023 KOPPERS HOLDINGS INC. (Exact name of registrant as specified in its charter) Pennsylvania 1-32737 20-1878963 (State or other jurisdiction of incorporation) (Commissi

Amendment No. 2, dated as of October 11, 2023, to the Credit Agreement, dated as of June 17, 2022, by and among Koppers Inc., as Borrower, Koppers Holdings Inc., as Holdings, the Lenders and L/C issuers party thereto, PNC Bank, National

EX-10.1 Exhibit 10.1 Execution Version AMENDMENT NO. 2 AMENDMENT NO. 2, dated as of October 11, 2023 (this “Amendment”), to the Credit Agreement, dated as of June 17, 2022 (as amended by Amendment No. 1, dated as of April 10, 2023, and as further amended, supplemented, amended and restated or otherwise modified from time to time, the “Credit Agreement”), among KOPPERS HOLDINGS INC., a Pennsylvania

Koppers Announces Successful Completion of Term Loan B Repricing Leverage-Neutral Transaction Reduces Interest Rate Margins by 50 Basis Points

EX-99.1 Exhibit 99.1 Koppers Holdings Inc. 436 Seventh Avenue Pittsburgh, PA 15219-1800 Tel 412 227 2001 www.koppers.com News Release FOR IMMEDIATE RELEASE For Information: Quynh McGuire, Vice President, Investor Relations 412 227 2049 [email protected] Koppers Announces Successful Completion of Term Loan B Repricing Leverage-Neutral Transaction Reduces Interest Rate Margins by 50 Basis Points

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): October 11, 2023 KOPPERS HOLDINGS

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): October 11, 2023 KOPPERS HOLDINGS INC. (Exact name of Registrant as Specified in Its Charter) Pennsylvania 1-32737 20-1878963 (State or Other Jurisdiction of Incorporation) (Commissio

Regulation FD Disclosure, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): September 14, 2023 KOPPERS HOLDINGS INC. (Exact name of Registrant as Specified in Its Charter) Pennsylvania 1-32737 20-1878963 (State or Other Jurisdiction of Incorporation) (Commiss

Koppers Holdings Inc. Announces Increase to 2023 Outlook as Management Prepares to Host Investor Day Today

Exhibit 99.1 Koppers Holdings Inc. 436 Seventh Avenue Pittsburgh, PA 15219-1800 Tel 412 227 2001 www.koppers.com News Release FOR IMMEDIATE RELEASE For Information: Quynh McGuire, Vice President, Investor Relations 412 227 2049 [email protected] Koppers Holdings Inc. Announces Increase to 2023 Outlook as Management Prepares to Host Investor Day Today PITTSBURGH, September 14, 2023 – Koppers Ho

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): August 03, 2023 KOPPERS HOLDINGS INC. (Exact name of registrant as specified in its charter) Pennsylvania 1-32737 20-1878963 (State or other jurisdiction of incorporation) (Commission

Third Amended and Restated Bylaws, as adopted on August 2, 2023, of Koppers Holdings Inc.

Exhibit 3.2 THIRD AMENDED AND RESTATED BYLAWS OF Koppers Holdings Inc. (a Pennsylvania Corporation) August 2, 2023 Article I Offices and Fiscal Year Section 1.01. Registered Office Provider. The name of the registered office provider of the corporation and the county of venue is Corporation Service Company, Allegheny County, until otherwise established by an amendment of the articles of incorporat

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2023 Commission file number 1-32737 KOPP

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2023 Commission file number 1-32737 KOPPERS HOLDINGS INC. (Exact name of registrant as specified in its charter) Pennsylvania 20-1878963 (State of incorporation) (IRS Employer Identification

Amendments to Articles of Incorporation or Bylaws; Change in Fiscal Year, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): August 02, 2023 KOPPERS HOLDINGS INC. (Exact name of Registrant as Specified in Its Charter) Pennsylvania 1-32737 20-1878963 (State or Other Jurisdiction of Incorporation) (Commission

Form of Restricted Stock Unit Issuance Agreement Non-Employee Director - Time Vesting

Exhibit 10.2 KOPPERS HOLDINGS INC. RESTRICTED STOCK UNIT ISSUANCE AGREEMENT NON-EMPLOYEE DIRECTOR - TIME vesting RECITALS A. The Board has adopted the Plan for the purpose of retaining the services of selected employees, non-employee members of the Board (or the board of directors of any Affiliate) and consultants who provide services to the Corporation (or any Affiliate). B. Participant is to ren

Amendment to the Koppers Holdings Inc. Benefit Restoration Plan, effective as of May 1, 2023

Exhibit 10.1 Amendment to the Koppers Holdings Inc. Benefit Restoration Plan WHEREAS, Koppers Holdings Inc. (the “Company”) sponsors the Koppers Holdings Inc. Benefit Restoration Plan (the “Plan”) for the benefit of certain key employees; WHEREAS, the Company has reserved the right to amend the Plan in Section 7.1 of the Plan; and WHEREAS, the Company wishes to amend the Plan to transfer sponsorsh

Koppers Reports Second Quarter 2023 Results; Reaffirms 2023 Outlook Record Quarter Sales of $577.2 Million vs. $502.5 Million in Prior Year Quarter Second Quarter Diluted EPS of $1.15 vs. $0.55 in Prior Year Quarter Adjusted EPS of $1.26 vs. $0.97 in

Exhibit 99.1 Koppers Holdings Inc. 436 Seventh Avenue Pittsburgh, PA 15219-1800 Tel 412 227 2001 www.koppers.com News Release FOR IMMEDIATE RELEASE For Information: Quynh McGuire, Vice President, Investor Relations 412 227 2049 [email protected] Koppers Reports Second Quarter 2023 Results; Reaffirms 2023 Outlook Record Quarter Sales of $577.2 Million vs. $502.5 Million in Prior Year Quarter Se

Amendment to Amended and Restated Articles of Incorporation of Koppers Holdings Inc.

Exhibit 3.1 ARTICLES OF AMENDMENT In compliance with the requirements of the applicable provisions (relating to articles of amendment), the undersigned, desiring to amend its articles, hereby states that: 1. The name of the corporation is: Koppers Holdings Inc. 2. The name of its commercial registered office provider and the county of venue is: c/o: Corporation Service Company and Allegheny County

Koppers Reports First Quarter 2023 Results; Reaffirms 2023 Outlook Record First Quarter Sales of $513.4 Million vs. $459.3 Million in Prior Year Quarter Record First Quarter Diluted EPS of $1.19 vs. $0.87 in Prior Year Quarter Adjusted EPS of $1.12 v

Exhibit 99.1 Koppers Holdings Inc. 436 Seventh Avenue Pittsburgh, PA 15219-1800 Tel 412 227 2001 www.koppers.com News Release FOR IMMEDIATE RELEASE For Information: Quynh McGuire, Vice President, Investor Relations 412 227 2049 [email protected] Koppers Reports First Quarter 2023 Results; Reaffirms 2023 Outlook Record First Quarter Sales of $513.4 Million vs. $459.3 Million in Prior Year Quart

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): May 04, 2023 KOPPERS HOLDINGS INC. (Exact name of registrant as specified in its charter) Pennsylvania 1-32737 20-1878963 (State or other jurisdiction of incorporation) (Commission Fi

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2023 Commission file number 1-32737 KOP

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2023 Commission file number 1-32737 KOPPERS HOLDINGS INC. (Exact name of registrant as specified in its charter) Pennsylvania 20-1878963 (State of incorporation) (IRS Employer Identificatio

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K/A (Amendment No. 1) CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): May 04, 2023 KOPPERS HOLDINGS INC. (Exact name of Registrant as Specified in Its Charter) Pennsylvania 1-32737 20-1878963 (State or Other Jurisdiction of Incorpora

* * *

April 25, 2023 Mindy Hooker Anne McConnell Office of Manufacturing Division of Corporation Finance Securities and Exchange Commission 100 F Street, N.

Amendment No. 1, dated as of April 10, 2023, to the Credit Agreement, dated as of June 17, 2022, by and among Koppers Inc., as Borrower, Koppers Holdings Inc., as Holdings, the Lenders and L/C issuers party thereto, PNC Bank, National Association, as Revolving Administrative Agent, Collateral Agent and Swingline Loan Lender, and Wells Fargo Bank, National Association, as Term Administrative Agent

EX-10.1 Exhibit 10.1 EXECUTION VERSION AMENDMENT NO. 1 AMENDMENT NO. 1, dated as of April 10, 2023 (this “Amendment”), to the Credit Agreement, dated as of June 17, 2022 (as amended, supplemented, amended and restated or otherwise modified from time to time, the “Credit Agreement”), among KOPPERS HOLDINGS INC., a Pennsylvania corporation (“Holdings”), KOPPERS INC., a Pennsylvania corporation (the

Koppers Announces Closing of $400 Million Term Loan B; Redeems 6.00% Senior Unsecured Notes due 2025

EX-99.1 Exhibit 99.1 Koppers Holdings Inc. 436 Seventh Avenue Pittsburgh, PA 15219-1800 Tel 412 227 2001 www.koppers.com News Release FOR IMMEDIATE RELEASE For Information: Quynh McGuire, Vice President, Investor Relations 412 227 2049 [email protected] Koppers Announces Closing of $400 Million Term Loan B; Redeems 6.00% Senior Unsecured Notes due 2025 PITTSBURGH, April 11, 2023 – Koppers Hold

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): April 10, 2023 KOPPERS HOLDINGS I

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): April 10, 2023 KOPPERS HOLDINGS INC. (Exact name of Registrant as Specified in Its Charter) Pennsylvania 1-32737 20-1878963 (State or Other Jurisdiction of Incorporation) (Commission

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. )

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. ) Filed by the Registrant ☒ Filed by a Party other than the Registrant ☐ Check the appropriate box: ☐ Preliminary Proxy Statement ☐ Confidential, for Use of the Commission Only (as permitted by Rule 14

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): March 20, 2023 KOPPERS HOLDINGS INC. (Exact name of Registrant as Specified in Its Charter) Pennsylvania 1-32737 20-1878963 (State or Other Jurisdiction of Incorporation) (Commission

Koppers Holdings Names Andrew D. Sandifer to Board Company Expands Board of Directors from Eight to Nine Members

Koppers Holdings Inc. 436 Seventh Avenue Pittsburgh, PA 15219-1800 Tel 412 227 2001 www.koppers.com News Release FOR IMMEDIATE RELEASE For Information: Quynh McGuire, Vice President, Investor Relations 412 227 2049 [email protected] Koppers Holdings Names Andrew D. Sandifer to Board Company Expands Board of Directors from Eight to Nine Members PITTSBURGH, March 22, 2023 – Koppers Holdings Inc.

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): March 10, 2023 KOPPERS HOLDINGS INC. (Exact name of Registrant as Specified in Its Charter) Pennsylvania 1-32737 20-1878963 (State or Other Jurisdiction of Incorporation) (Commission

Koppers Announces Pricing and Allocation of $400 Million Term Loan B Continued Focus on Enhancing Balance Sheet Flexibility

Koppers Holdings Inc. 436 Seventh Avenue Pittsburgh, PA 15219-1800 Tel 412 227 2001 www.koppers.com News Release FOR IMMEDIATE RELEASE For Information: Quynh McGuire, Vice President, Investor Relations 412 227 2049 [email protected] Koppers Announces Pricing and Allocation of $400 Million Term Loan B Continued Focus on Enhancing Balance Sheet Flexibility PITTSBURGH, March 10, 2023 – Koppers Ho

Koppers Reports Fourth Quarter and Full-Year 2022 Results; Provides 2023 Outlook Record Quarter Sales of $482.6 Million vs. $405.3 Million in Prior Year Quarter Record Year Sales of $1.98 Billion vs. $1.68 Billion in Prior Year

Exhibit 99.1 Koppers Holdings Inc. 436 Seventh Avenue Pittsburgh, PA 15219-1800 Tel 412 227 2001 www.koppers.com News Release FOR IMMEDIATE RELEASE For Information: Quynh McGuire, Vice President, Investor Relations 412 227 2049 [email protected] Koppers Reports Fourth Quarter and Full-Year 2022 Results; Provides 2023 Outlook Record Quarter Sales of $482.6 Million vs. $405.3 Million in Prior Ye

List of subsidiaries of the Company.

Exhibit 21 KOPPERS HOLDINGS INC. SUBSIDIARIES OF THE COMPANY Name* Jurisdiction of Incorporation/Formation Koppers Inc. Pennsylvania Koppers Asia LLC Delaware Cox Wood of Alabama, LLC Alabama Koppers Delaware, Inc. Delaware Koppers World-Wide Ventures Corporation Delaware Koppers Ventures Inc. Delaware Koppers Railroad Structures Inc. Delaware Koppers Recovery Resources LLC Kansas Koppers Performa

Powers of Attorney.

Exhibit 24 KOPPERS HOLDINGS INC. POWER OF ATTORNEY (10-K) I, Stephen R. Tritch, a Director of Koppers Holdings Inc. (the “Corporation”), a Pennsylvania corporation, hereby constitute and appoint Leroy M. Ball, Jimmi Sue Smith and Bradley A. Pearce, or any of them, my true and lawful attorneys or attorneys-in-fact, with the full power of substitution and revocation, (i) to sign, in my name and on m

Form of Restricted Stock Unit Issuance Agreement Non-Employee Director - Time Vesting

Exhibit 10.38 KOPPERS HOLDINGS INC. RESTRICTED STOCK UNIT ISSUANCE AGREEMENT NON-EMPLOYEE DIRECTOR - TIME vesting RECITALS A. The Board has adopted the Plan for the purpose of retaining the services of selected employees, non-employee members of the Board (or the board of directors of any Affiliate) and consultants who provide services to the Corporation (or any Affiliate). B. Participant is to re

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): February 27, 2023 KOPPERS HOLDINGS INC. (Exact name of Registrant as Specified in Its Charter) Pennsylvania 1-32737 20-1878963 (State or Other Jurisdiction of Incorporation) (Commissi

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-K ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2022 Commission file number 1-32737 KOPPERS

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-K ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2022 Commission file number 1-32737 KOPPERS HOLDINGS INC. (Exact name of registrant as specified in its charter) Pennsylvania 20-1878963 (State of incorporation) (IRS Employer Identification No.

KOP / Kopper Holdings, Inc. / Rubric Capital Management LP - SC 13G/A Passive Investment

SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G/A Under the Securities Exchange Act of 1934 (Amendment No. 1)* Koppers Holdings Inc. (Name of Issuer) Common Stock, $0.01 par value per share (Title of Class of Securities) 50060P106 (CUSIP Number) December 31, 2022 (Date of event which requires filing of this statement) Check the appropriate box to designate the rule pursuant

KOP / Kopper Holdings, Inc. / VANGUARD GROUP INC - SCHEDULE 13G/A Passive Investment

SC 13G/A 1 tv01257-koppersholdingsinc.htm SCHEDULE 13G/A SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 13G Under the Securities Exchange Act of 1934 (Amendment No.: 4)* Name of issuer: Koppers Holdings Inc. Title of Class of Securities: Common Stock CUSIP Number: 50060P106 Date of Event Which Requires Filing of this Statement: December 30, 2022 Check the appropriate box to des

Form of Restricted Stock Unit Issuance Agreement - TSR Performance Vesting

Exhibit 10.3 KOPPERS HOLDINGS INC. RESTRICTED STOCK UNIT ISSUANCE AGREEMENT- TSR Performance vesting RECITALS A. The Board has adopted the Plan for the purpose of retaining the services of selected Employees, non-employee members of the Board (or the board of directors of any Affiliate) and consultants who provide services to the Corporation (or any Affiliate). B. Participant is to render valuable

Form of Restricted Stock Unit Issuance Agreement - Time Vesting

Exhibit 10.1 KOPPERS HOLDINGS INC. RESTRICTED STOCK UNIT ISSUANCE AGREEMENT – TIME VESTING RECITALS A. The Board has adopted the Plan for the purpose of retaining the services of selected Employees, non-employee members of the Board (or the board of directors of any Affiliate) and consultants who provide services to the Corporation (or any Affiliate). B. Participant is to render valuable services

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): December 07, 2022 KOPPERS HOLDINGS INC. (Exact name of Registrant as Specified in Its Charter) Pennsylvania 1-32737 20-1878963 (State or Other Jurisdiction of Incorporation) (Commissi

Form of Restricted Stock Unit Issuance Agreement - EBITDA Performance Vesting

Exhibit 10.2 KOPPERS HOLDINGS INC. RESTRICTED STOCK UNIT ISSUANCE AGREEMENT- ebitda Performance vesting RECITALS A. The Board has adopted the Plan for the purpose of retaining the services of selected Employees, non-employee members of the Board (or the board of directors of any Affiliate) and consultants who provide services to the Corporation (or any Affiliate). B. Participant is to render valua

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2022 Commission file number 1-32737

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2022 Commission file number 1-32737 KOPPERS HOLDINGS INC. (Exact name of registrant as specified in its charter) Pennsylvania 20-1878963 (State of incorporation) (IRS Employer Identific

Koppers Reports Third Quarter 2022 Results Declares Quarterly Dividend on Common Shares Reaffirms 2022 Outlook for Sales and EBITDA Record Quarter Sales of $536.1 Million vs. $424.8 Million in Prior Year Quarter

Exhibit 99.1 Koppers Holdings Inc. 436 Seventh Avenue Pittsburgh, PA 15219-1800 Tel 412 227 2001 www.koppers.com News Release FOR IMMEDIATE RELEASE For Information: Quynh McGuire, Vice President, Investor Relations 412 227 2049 [email protected] Koppers Reports Third Quarter 2022 Results Declares Quarterly Dividend on Common Shares Reaffirms 2022 Outlook for Sales and EBITDA Record Quarter Sal

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): November 04, 2022 KOPPERS HOLDINGS INC. (Exact name of Registrant as Specified in Its Charter) Pennsylvania 1-32737 20-1878963 (State or Other Jurisdiction of Incorporation) (Commissi

Koppers Holdings Inc. Director Deferred Compensation Plan, as amended and restated effective August 3, 2022

Exhibit 10.1 KOPPERS HOLDINGS INC. DIRECTOR DEFERRED COMPENSATION PLAN As amended and restated effective August 3, 2022 1. Name: This plan shall be known as the ?Koppers Holdings Inc. Director Deferred Compensation Plan? (the ?Plan?). 2. Purpose: The purpose of this Plan is to provide Non-Employee Directors with the opportunity to defer some or all of their eligible compensation received as direct

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2022 Commission file number 1-32737 KOPP

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2022 Commission file number 1-32737 KOPPERS HOLDINGS INC. (Exact name of registrant as specified in its charter) Pennsylvania 20-1878963 (State of incorporation) (IRS Employer Identification

Koppers Reports Second Quarter 2022 Results Declares Quarterly Dividend on Common Shares Reaffirms 2022 Outlook Record Quarter Sales of $502.5 Million vs. $441.0 Million in Prior Year Quarter New $800 Million Credit Facility Provides Additional Finan

Exhibit 99.1 Koppers Holdings Inc. 436 Seventh Avenue Pittsburgh, PA 15219-1800 Tel 412 227 2001 www.koppers.com News Release FOR IMMEDIATE RELEASE For Information: Quynh McGuire, Vice President, Investor Relations 412 227 2049 [email protected] Koppers Reports Second Quarter 2022 Results Declares Quarterly Dividend on Common Shares Reaffirms 2022 Outlook Record Quarter Sales of $502.5 Million

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): August 4, 2022 KOPPERS HOLDINGS INC. (Exact name of registrant as specified in its charter) Pennsylvania 1-32737 20-1878963 (State or other jurisdiction of incorporation) (Commission

Entry into a Material Definitive Agreement, Termination of a Material Definitive Agreement, Financial Statements and Exhibits, Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): June 17, 2022 KOPPERS HOLDINGS INC. (Exact name of registrant as specified in its charter) Pennsylvania 1-32737 20-1878963 (State or other jurisdiction of incorporation) (Commission F

Koppers Secures New $800 Million Credit Facility Provides Additional Financial Flexibility to Support Ongoing Growth Strategy and Sustainability Initiatives

Exhibit 99.1 Koppers Holdings Inc. 436 Seventh Avenue Pittsburgh, PA 15219-1800 Tel 412 227 2001 www.koppers.com News Release FOR IMMEDIATE RELEASE For Information: Quynh McGuire, Vice President, Investor Relations 412 227 2049 [email protected] Koppers Secures New $800 Million Credit Facility Provides Additional Financial Flexibility to Support Ongoing Growth Strategy and Sustainability Initi

Credit Agreement, dated as of June 17, 2022, by and among Koppers Inc., as Borrower, Koppers Holdings Inc., as Holdings, the Lenders and L/C Issuers party thereto, PNC Bank, National Association, as Revolving Administrative Agent, Collateral Agent and Swingline Loan Lender, and Wells Fargo Bank, National Association, as Term Administrative Agent

Exhibit 10.1 EXECUTION VERSION Deal CUSIP: 50060QAA2 Revolver CUSIP: 50060QAB0 CREDIT AGREEMENT dated as of June 17, 2022 among KOPPERS HOLDINGS INC., as Holdings, KOPPERS INC., as the Borrower, THE LENDERS AND L/C ISSUERS FROM TIME TO TIME PARTY HERETO, PNC BANK, NATIONAL ASSOCIATION, as Revolving Administrative Agent, Collateral Agent and Swingline Loan Lender and WELLS FARGO BANK, NATIONAL ASSO

Financial Statements and Exhibits, Results of Operations and Financial Condition, Submission of Matters to a Vote of Security Holders

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): May 5, 2022 KOPPERS HOLDINGS INC. (Exact name of registrant as specified in its charter) Pennsylvania 1-32737 20-1878963 (State or other jurisdiction of incorporation) (Commission Fil

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2022 Commission file number 1-32737 KOP

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2022 Commission file number 1-32737 KOPPERS HOLDINGS INC. (Exact name of registrant as specified in its charter) Pennsylvania 20-1878963 (State of incorporation) (IRS Employer Identificatio

Koppers Reports First Quarter 2022 Results Record Quarter Sales of $459.3 Million vs. $407.5 Million in Prior Year Quarter Balanced Portfolio Serving Diversified End Markets Drove Strong Results

Exhibit 99.1 Koppers Holdings Inc. 436 Seventh Avenue Pittsburgh, PA 15219-1800 Tel 412 227 2001 www.koppers.com News Release FOR IMMEDIATE RELEASE For Information: Quynh McGuire, Vice President, Investor Relations 412 227 2049 [email protected] Koppers Reports First Quarter 2022 Results Record Quarter Sales of $459.3 Million vs. $407.5 Million in Prior Year Quarter Balanced Portfolio Serving

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. )

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. ) Filed by the Registrant ? Filed by a Party other than the Registrant ? Check the appropriate box: ? Preliminary Proxy Statement ? Confidential, for Use of the Commission Only (as permitted by Rule 14

Form of Restricted Stock Unit Issuance Agreement – Performance Vesting

Exhibit 10.50 KOPPERS HOLDINGS INC. RESTRICTED STOCK UNIT ISSUANCE AGREEMENT- Performance vesting RECITALS A. The Board has adopted the Plan for the purpose of retaining the services of selected Employees, non-employee members of the Board (or the board of directors of any Affiliate) and consultants who provide services to the Corporation (or any Affiliate). B. Participant is to render valuable se

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-K ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2021 Commission file number 1-32737 KOPPERS

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-K ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2021 Commission file number 1-32737 KOPPERS HOLDINGS INC. (Exact name of registrant as specified in its charter) Pennsylvania 20-1878963 (State of incorporation) (IRS Employer Identification No.

Koppers Reports Fourth Quarter and Full-Year 2021 Results; Provides 2022 Outlook 2021 Record Sales of $1.679 Billion, excluding KJCC 2021 Net Income Attributable to Koppers of $85.2 Million vs. Prior Year of $122.0 Million 2021 Adjusted EBITDA of $22

Exhibit 99.1 Koppers Holdings Inc. 436 Seventh Avenue Pittsburgh, PA 15219-1800 Tel 412 227 2001 www.koppers.com News Release FOR IMMEDIATE RELEASE For Information: Quynh McGuire, Vice President, Investor Relations 412 227 2049 [email protected] Koppers Reports Fourth Quarter and Full-Year 2021 Results; Provides 2022 Outlook 2021 Record Sales of $1.679 Billion, excluding KJCC 2021 Net Income A

Form of Restricted Stock Unit Issuance Agreement – Time Vesting

Exhibit 10.49 KOPPERS HOLDINGS INC. RESTRICTED STOCK UNIT ISSUANCE AGREEMENT ? TIME VESTING RECITALS A.The Board has adopted the Plan for the purpose of retaining the services of selected Employees, non-employee members of the Board (or the board of directors of any Affiliate) and consultants who provide services to the Corporation (or any Affiliate). B.Participant is to render valuable services t

Sixth Amendment to Credit Agreement, dated as of December 28, 2021, by and among Koppers Inc., as Borrower, the Guarantors party thereto, the Lenders party thereto, and PNC Bank, National Association, as Administrative Agent.

Exhibit 10.48 SIXTH AMENDMENT TO credit agreement THIS SIXTH AMENDMENT to credit agreement (this ?Amendment?) is dated as of December 28, 2021 (the ?Effective Date?) (subject to Paragraph 7 below) and is made by and among Koppers Inc., a Pennsylvania corporation (the ?Borrower?), the Guarantors, the Lenders and PNC BANK, NATIONAL ASSOCIATION, in its capacity as the Administrative Agent (in such ca

Financial Statements and Exhibits, Results of Operations and Financial Condition, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): February 23, 2022 KOPPERS HOLDINGS INC. (Exact name of registrant as specified in its charter) Pennsylvania 1-32737 20-1878963 (State or other jurisdiction of incorporation) (Commissi

Koppers Holdings Inc. Reinstates Quarterly Cash Dividend and Declares First Dividend Since 2014

Exhibit 99.2 Koppers Holdings Inc. 436 Seventh Avenue Pittsburgh, PA 15219-1800 Tel 412 227 2001 www.koppers.com News Release FOR IMMEDIATE RELEASE For Information: Quynh McGuire, Vice President, Investor Relations 412 227 2049 [email protected] Koppers Holdings Inc. Reinstates Quarterly Cash Dividend and Declares First Dividend Since 2014 PITTSBURGH (February 23, 2022) ? Koppers Holdings Inc.

List of subsidiaries of the Company.

EX-21 6 kop-ex216.htm EX-21 Exhibit 21 KOPPERS HOLDINGS INC. SUBSIDIARIES OF THE COMPANY Name* Jurisdiction of Incorporation/Formation Koppers Inc. Pennsylvania Koppers Asia LLC Delaware Cox Wood of Alabama, LLC Alabama Koppers Delaware, Inc. Delaware Koppers World-Wide Ventures Corporation Delaware Koppers Ventures Inc. Delaware Koppers Railroad Structures Inc. Delaware Koppers Recovery Resources

Form of Notice of Grant of Stock Option

Exhibit 10.51 KOPPERS HOLDINGS INC. NOTICE OF GRANT OF STOCK OPTION Notice is hereby given of the following option grant (the ?Option?) to purchase shares of the Common Stock of Koppers Holdings Inc. (the ?Corporation?): Optionee: Grant Date: Exercise Price: $Number of Option Shares: Expiration Date: Type of Option: Incentive Stock Option Non-Qualified Stock Option Vesting Schedule: The Option sha

Powers of Attorney.

EX-24 8 kop-ex2410.htm EX-24 Exhibit 24 KOPPERS HOLDINGS INC. POWER OF ATTORNEY (10-K) I, Stephen R. Tritch, a Director of Koppers Holdings Inc. (the “Corporation”), a Pennsylvania corporation, hereby constitute and appoint Leroy M. Ball, Jimmi Sue Smith and Bradley A. Pearce, or any of them, my true and lawful attorneys or attorneys-in-fact, with the full power of substitution and revocation, (i)

KOP / Kopper Holdings, Inc. / Rubric Capital Management LP - SC 13G Passive Investment

SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. )* Koppers Holdings Inc. (Name of Issuer) Common Stock, $0.01 par value per share (Title of Class of Securities) 50060P106 (CUSIP Number) December 31, 2021 (Date of event which requires filing of this statement) Check the appropriate box to designate the rule pursuant to

KOP / Kopper Holdings, Inc. / VANGUARD GROUP INC - SCHEDULE 13G/A Passive Investment

SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 13G Under the Securities Exchange Act of 1934 (Amendment No.: 3)* Name of issuer: Koppers Holdings Inc. Title of Class of Securities: Common Stock CUSIP Number: 50060P106 Date of Event Which Requires Filing of this Statement: December 31, 2021 Check the appropriate box to designate the rule pursuant to which this Schedule is filed:

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): December 1, 2021 KOPPERS HOLDINGS INC. (Exact name of registrant as specified in its charter) Pennsylvania 1-32737 20-1878963 (State or other jurisdiction of incorporation) (Commissio

Koppers Holdings Inc. Reports Third Quarter 2021 Results Sales of $424.8 Million vs. Prior Year of $437.5 Million Net Income Attributable to Koppers of $10.2 Million vs. Prior Year of $75.6 Million Adjusted EBITDA of $53.9 Million vs. Prior Year of $

Exhibit 99.1 Koppers Holdings Inc. 436 Seventh Avenue Pittsburgh, PA 15219-1800 Tel 412 227 2001 www.koppers.com News Release FOR IMMEDIATE RELEASE For Information: Michael J. Zugay, Chief Financial Officer 412 227 2231 [email protected] Koppers Holdings Inc. Reports Third Quarter 2021 Results Sales of $424.8 Million vs. Prior Year of $437.5 Million Net Income Attributable to Koppers of $10.2 Mi

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2021 Commission file number 1-32737

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2021 Commission file number 1-32737 KOPPERS HOLDINGS INC. (Exact name of registrant as specified in its charter) Pennsylvania 20-1878963 (State of incorporation) (IRS Employer Identific

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): November 4, 2021 KOPPERS HOLDINGS INC. (Exact name of registrant as specified in its charter) Pennsylvania 1-32737 20-1878963 (State or other jurisdiction of incorporation) (Commissio

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): August 6, 2021 KOPPERS HOLDINGS INC. (Exact name of registrant as specified in its charter) Pennsylvania 1-32737 20-1878963 (State or other jurisdiction of incorporation) (Commission

Koppers Holdings Inc. Director Deferred Compensation Plan

Exhibit 99.1 KOPPERS HOLDINGS INC. DIRECTOR DEFERRED COMPENSATION PLAN 1. Name: This plan shall be known as the ?Koppers Holdings Inc. Director Deferred Compensation Plan? (the ?Plan?). 2. Purpose: The purpose of this Plan is to provide Non-Employee Directors with the opportunity to defer some or all of their eligible compensation received as directors of Koppers Holdings Inc. (the ?Company?). The

Koppers Announces Planned Leadership Succession Michael Zugay to Retire as Chief Financial Officer; Jimmi Sue Smith Named as Successor

Exhibit 99.1 Koppers Holdings Inc. 436 Seventh Avenue Pittsburgh, PA 15219-1800 Tel 412 227 2001 www.koppers.com News Release FOR IMMEDIATE RELEASE For Information: Michael J. Zugay, Chief Financial Officer 412 227 2231 [email protected] Koppers Announces Planned Leadership Succession Michael Zugay to Retire as Chief Financial Officer; Jimmi Sue Smith Named as Successor PITTSBURGH, August 6, 202

As filed with the Securities and Exchange Commission on August 6, 2021 UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM S-8 REGISTRATION STATEMENT THE SECURITIES ACT OF 1933 Koppers Holdings Inc. (Exact name of registrant

Registration No. 333- As filed with the Securities and Exchange Commission on August 6, 2021 UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM S-8 REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933 Koppers Holdings Inc. (Exact name of registrant as specified in its charter) Pennsylvania 20-1878963 (State or other jurisdiction of incorporation or organization) (IRS E

Koppers Holdings Inc. Reports Second Quarter 2021 Results Sales of $441.0 Million vs. Prior Year of $436.6 Million Net Income Attributable to Koppers of $26.9 Million vs. Prior Year of $29.2 Million Adjusted EBITDA of $65.6 Million vs. Prior Year of

Exhibit 99.1 Koppers Holdings Inc. 436 Seventh Avenue Pittsburgh, PA 15219-1800 Tel 412 227 2001 www.koppers.com News Release FOR IMMEDIATE RELEASE For Information: Michael J. Zugay, Chief Financial Officer 412 227 2231 [email protected] Koppers Holdings Inc. Reports Second Quarter 2021 Results Sales of $441.0 Million vs. Prior Year of $436.6 Million Net Income Attributable to Koppers of $26.9 M

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2021 Commission file number 1-32737 KOPP

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2021 Commission file number 1-32737 KOPPERS HOLDINGS INC. (Exact name of registrant as specified in its charter) Pennsylvania 20-1878963 (State of incorporation) (IRS Employer Identification

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): August 6, 2021 KOPPERS HOLDINGS INC. (Exact name of registrant as specified in its charter) Pennsylvania 1-32737 20-1878963 (State or other jurisdiction of incorporation) (Commission

Quarterly Report - 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2021 Commission file number 1-32737 KOPPERS HOLDINGS INC. (Exact name of registrant as specified in its charter) Pennsylvania 20-1878963 (State of incorporation) (IRS Employer Identificatio

Powers of Attorney (included on the signature page to this Registration Statement).

Registration No. 333- As filed with the Securities and Exchange Commission on May 7, 2021 UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM S-8 REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933 Koppers Holdings Inc. (Exact name of registrant as specified in its charter) Pennsylvania 20-1878963 (State or other jurisdiction of incorporation or organization) (I.R.S. Emp

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits, Results of Operations and Financial Condition, Submission of Matters to a Vote of Security Holders

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): May 6, 2021 KOPPERS HOLDINGS INC. (Exact name of registrant as specified in its charter) Pennsylvania 1-32737 20-1878963 (State or other jurisdiction of incorporation) (Commission Fil

First Amendment to the Koppers Holdings Inc. 2020 Long Term Incentive Plan

Exhibit 99.2 First Amendment to the Koppers Holdings Inc. 2020 Long Term Incentive Plan This First Amendment (this ?Amendment?), dated March 22, 2021, to the Koppers Holdings Inc. 2020 Long Term Incentive Plan (the ?Plan?), is made and adopted by Koppers Holdings Inc. (the ?Company?), subject to approval of the shareholders of the Company as set forth below. Statement of Purpose The Plan originall

Form of Change in Control Agreement entered into as of March 1, 2021 between Koppers Holdings Inc. and the named Executive

Exhibit 10.1 CHANGE IN CONTROL AGREEMENT This Agreement made this 1st day of March, 2021 by and between [ ] (?Executive?) and Koppers Holdings Inc. (the ?Company?). WHEREAS, the Company considers it essential to the best interests of its stockholders to foster the continuous employment of certain key management personnel of the Company and its affiliates; and WHEREAS, the Board of Directors of the

Koppers Holdings Inc. Reports Record-First Quarter 2021 Results Sales of $407.5 Million vs. Prior Year of $401.9 Million Operating Profit of $43.9 Million vs. Prior Year of $13.6 Million Net Income Attributable to Koppers of $25.9 Million vs. Prior Y

Exhibit 99.1 Koppers Holdings Inc. 436 Seventh Avenue Pittsburgh, PA 15219-1800 Tel 412 227 2001 www.koppers.com News Release FOR IMMEDIATE RELEASE For Information: Michael J. Zugay, Chief Financial Officer 412 227 2231 [email protected] Koppers Holdings Inc. Reports Record-First Quarter 2021 Results Sales of $407.5 Million vs. Prior Year of $401.9 Million Operating Profit of $43.9 Million vs. P

Amended and Restated Koppers Holdings Inc. Employee Stock Purchase Plan

Exhibit 99.1 KOPPERS HOLDINGS INC. EMPLOYEE STOCK PURCHASE PLAN AS AMENDED AND RESTATED EFFECTIVE MARCH 22, 2021 1. Purpose of the Plan. Koppers Holdings Inc. (the ?Company?) believes that ownership of shares of its common stock by employees of the Company and its Participating Subsidiaries (as defined below) is desirable as an incentive to better performance and improvement of profits, and as a m

- S-8

Registration No. 333- As filed with the Securities and Exchange Commission on May 7, 2021 UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM S-8 REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933 Koppers Holdings Inc. (Exact name of registrant as specified in its charter) Pennsylvania 20-1878963 (State or other jurisdiction of incorporation or organization) (I.R.S. Emp

- DEFA14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. ) Filed by the Registrant ? Filed by a Party other than the Registrant ? Check the appropriate box: ? Preliminary Proxy Statement ? Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) ? Defin

- DEFA14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. ) Filed by the Registrant ? Filed by a Party other than the Registrant ? Check the appropriate box: ? Preliminary Proxy Statement ? Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) ? Defin

- NOTICE & PROXY STATEMENT

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. ) Filed by the Registrant ? Filed by a Party other than the Registrant ? Check the appropriate box: ? Preliminary Proxy Statement ? Confidential, for Use of the Commission Only (as permitted by Rule 14

Powers of Attorney.

Exhibit 24 KOPPERS HOLDINGS INC. POWER OF ATTORNEY (10-K) I, Stephen R. Tritch, a Director of Koppers Holdings Inc. (the ?Corporation?), a Pennsylvania corporation, hereby constitute and appoint Leroy M. Ball, Michael J. Zugay and Bradley A. Pearce, or any of them, my true and lawful attorneys or attorneys-in-fact, with the full power of substitution and revocation, (i)to sign, in my name and on m

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): February 24, 2021 KOPPERS HOLDINGS INC. (Exact name of registrant as specified in its charter) Pennsylvania 1-32737 20-1878963 (State or other jurisdiction of incorporation) (Commissi

Koppers Holdings Inc. Reports Fourth Quarter and Full-Year 2020 Results; Provides 2021 Outlook 2020 Record Sales of $1.669 Billion, excluding KJCC; Fourth Consecutive Year of Growth 2020 Operating Profit of $156.7 Million vs. Prior Year of $125.0 Mil

Exhibit 99.1 Koppers Holdings Inc. 436 Seventh Avenue Pittsburgh, PA 15219-1800 Tel 412 227 2001 www.koppers.com News Release FOR IMMEDIATE RELEASE For Information: Michael J. Zugay, Chief Financial Officer 412 227 2231 [email protected] Koppers Holdings Inc. Reports Fourth Quarter and Full-Year 2020 Results; Provides 2021 Outlook 2020 Record Sales of $1.669 Billion, excluding KJCC; Fourth Conse

Form of Restricted Stock Unit Issuance Agreement for Michael J. Zugay

Exhibit 10.43 KOPPERS HOLDINGS INC. RESTRICTED STOCK UNIT ISSUANCE AGREEMENT ? TIME VESTING RECITALS A.The Board has adopted the Plan for the purpose of retaining the services of selected Employees, non-employee members of the Board (or the board of directors of any Parent or Subsidiary) and consultants and other independent advisors who provide services to the Corporation (or any Parent or Subsid

Form of Restricted Stock Unit Issuance Agreement – Time Vesting

Exhibit 10.40 KOPPERS HOLDINGS INC. RESTRICTED STOCK UNIT ISSUANCE AGREEMENT ? TIME VESTING RECITALS A.The Board has adopted the Plan for the purpose of retaining the services of selected Employees, non-employee members of the Board (or the board of directors of any Parent or Subsidiary) and consultants and other independent advisors who provide services to the Corporation (or any Parent or Subsid

Annual Report - 10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-K ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2020 Commission file number 1-32737 KOPPERS HOLDINGS INC. (Exact name of registrant as specified in its charter) Pennsylvania 20-1878963 (State of incorporation) (IRS Employer Identification No.

Form of Notice of Grant of Stock Option

Exhibit 10.42 KOPPERS HOLDINGS INC. NOTICE OF GRANT OF STOCK OPTION Notice is hereby given of the following option grant (the ?Option?) to purchase shares of the Common Stock of Koppers Holdings Inc. (the ?Company?): Optionee: Grant Date: January 4, 2021 Exercise Price: $ Number of Option Shares: Expiration Date: January 4, 2031 Type of Option: Incentive Stock Option X Non-Qualified Stock Option V

List of subsidiaries of the Company.

Exhibit 21 KOPPERS HOLDINGS INC. SUBSIDIARIES OF THE COMPANY Name* Jurisdiction of Incorporation/Formation Koppers Inc. Pennsylvania Koppers Asia LLC Delaware Cox Wood of Alabama, LLC Alabama Koppers Delaware, Inc. Delaware Koppers World-Wide Ventures Corporation Delaware Koppers Ventures Inc. Delaware Koppers Railroad Structures Inc. Delaware Koppers Recovery Resources LLC Kansas Koppers Performa

Amendment to the Koppers Holdings Inc. Benefit Restoration Plan

Exhibit 10.44 Amendment to the Koppers Holdings Inc. Benefit Restoration Plan WHEREAS, Koppers Holdings Inc. (the ?Company?) sponsors the Koppers Holding Inc. Benefit Restoration Plan (the ?Plan?) for the benefit of certain key employees; WHEREAS, the Company has reserved the right to amend the Plan in Section 7.1 of the Plan; and WHEREAS, the Company wishes to amend the Plan to provide that an em

Form of Restricted Stock Unit Issuance Agreement – Performance Vesting

Exhibit 10.41 KOPPERS HOLDINGS INC. RESTRICTED STOCK UNIT ISSUANCE AGREEMENT- Performance vesting RECITALS A. The Board has adopted the Plan for the purpose of retaining the services of selected Employees, non-employee members of the Board (or the board of directors of any Parent or Subsidiary) and consultants and other independent advisors who provide services to the Corporation (or any Parent or

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 SCHEDULE 13G UNDER THE SECURITIES EXCHANGE ACT OF 1934 Koppers Holdings Inc. (Name of Issuer) (Title of Class of Securities) (CUSIP Number) December 31, 2020 (Date of Event Which

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 SCHEDULE 13G UNDER THE SECURITIES EXCHANGE ACT OF 1934 Koppers Holdings Inc. (Name of Issuer) Common (Title of Class of Securities) 50060P106 (CUSIP Number) December 31, 2020 (Date of Event Which Requires Filing of this Statement) Check the appropriate box to designate the rule pursuant to which this Schedule is filed: ☒ Rule

SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 13G Under the Securities Exchange Act of 1934 (Amendment No.: 2)*

SC 13G/A 1 tv01237-koppersholdingsinc.htm SCHEDULE 13G/A SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 13G Under the Securities Exchange Act of 1934 (Amendment No.: 2)* Name of issuer: Koppers Holdings Inc. Title of Class of Securities: Common Stock CUSIP Number: 50060P106 Date of Event Which Requires Filing of this Statement: December 31, 2020 Check the appropriate box to des

Koppers Holdings Inc. Provides Update on Fourth Quarter and 2020 Business Segment Performance

Exhibit 99.1 Koppers Holdings Inc. 436 Seventh Avenue Pittsburgh, PA 15219-1800 Tel 412 227 2001 www.koppers.com News Release FOR IMMEDIATE RELEASE For Information: Michael J. Zugay, Chief Financial Officer 412 227 2231 [email protected] Koppers Holdings Inc. Provides Update on Fourth Quarter and 2020 Business Segment Performance PITTSBURGH, January 28, 2021 – Koppers Holdings Inc. (NYSE: KOP),

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): January 28, 2021 KOPPERS HOLDINGS INC. (Exact name of registrant as specified in its charter) Pennsylvania 1-32737 20-1878963 (State or other jurisdiction of incorporation) (Commissio

Regulation FD Disclosure, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): December 17, 2020 KOPPERS HOLDINGS INC. (Exact name of registrant as specified in its charter) Pennsylvania 1-32737 20-1878963 (State or other jurisdiction of incorporation) (Commissi

Koppers Holdings Inc. Provides November 2020 Business Update; Reaffirms 2020 Outlook

Exhibit 99.1 Koppers Holdings Inc. 436 Seventh Avenue Pittsburgh, PA 15219-1800 Tel 412 227 2001 www.koppers.com News Release FOR IMMEDIATE RELEASE For Information: Michael J. Zugay, Chief Financial Officer 412 227 2231 [email protected] Koppers Holdings Inc. Provides November 2020 Business Update; Reaffirms 2020 Outlook PITTSBURGH, December 17, 2020 – Koppers Holdings Inc. (NYSE: KOP), an integ

Koppers Holdings Inc. Provides October 2020 Business Update; Reaffirms 2020 Outlook

Exhibit 99.1 Koppers Holdings Inc. 436 Seventh Avenue Pittsburgh, PA 15219-1800 Tel 412 227 2001 www.koppers.com News Release FOR IMMEDIATE RELEASE For Information: Michael J. Zugay, Chief Financial Officer 412 227 2231 [email protected] Koppers Holdings Inc. Provides October 2020 Business Update; Reaffirms 2020 Outlook PITTSBURGH, November 19, 2020 – Koppers Holdings Inc. (NYSE: KOP), an integr

Financial Statements and Exhibits - 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): November 19, 2020 KOPPERS HOLDINGS INC. (Exact name of registrant as specified in its charter) Pennsylvania 1-32737 20-1878963 (State or other jurisdiction of incorporation) (Commissi

Quarterly Report - 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2020 Commission file number 1-32737 KOPPERS HOLDINGS INC. (Exact name of registrant as specified in its charter) Pennsylvania 20-1878963 (State of incorporation) (IRS Employer Identific

Financial Statements and Exhibits, Results of Operations and Financial Condition - 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): November 4, 2020 KOPPERS HOLDINGS INC. (Exact name of registrant as specified in its charter) Pennsylvania 1-32737 20-1878963 (State or other jurisdiction of incorporation) (Commissio

Fifth Amendment to Credit Agreement, dated as of August 28, 2020, by and among Koppers Inc., as Borrower, the Guarantors party thereto, the Lenders party thereto, and PNC Bank, National Association, as Administrative Agent.

Exhibit 10.1 FIFTH AMENDMENT TO CREDIT AGREEMENT THIS FIFTH AMENDMENT TO CREDIT AGREEMENT (the "Amendment"), dated as of August 28, 2020 ("Fifth Amendment Closing Date") is made by and among Koppers Inc., a Pennsylvania corporation (the "Borrower"), the Guarantors (as defined in the Credit Agreement (as hereinafter defined)), the LENDERS (as defined in the Credit Agreement), and PNC Bank, National

Third Supplemental Indenture, dated as of August 20, 2020, among Koppers Utility Services LLC, Koppers Inc., Koppers Holdings Inc., as a Guarantor, the other Subsidiary Guarantors and Wells Fargo Bank, National Association, as trustee

Exhibit 4.1 THIRD SUPPLEMENTAL INDENTURE THIRD SUPPLEMENTAL INDENTURE (this “Supplemental Indenture”), dated as of August 20, 2020 , among Koppers Utility Services LLC, a Pennsylvania limited liability company (the “Guaranteeing Subsidiary”), a subsidiary of Koppers Inc. (or its permitted successor), a Pennsylvania corporation (the “Issuer”), the Issuer, Koppers Holdings Inc., as a Guarantor, the

Koppers Holdings Inc. Reports Third Quarter 2020 Results; Reaffirms 2020 Outlook

Exhibit 99.1 Koppers Holdings Inc. 436 Seventh Avenue Pittsburgh, PA 15219-1800 Tel 412 227 2001 www.koppers.com News Release FOR IMMEDIATE RELEASE For Information: Michael J. Zugay, Chief Financial Officer 412 227 2231 [email protected] Koppers Holdings Inc. Reports Third Quarter 2020 Results; Reaffirms 2020 Outlook PITTSBURGH, November 4, 2020 – Koppers Holdings Inc. (NYSE: KOP), an integrated

Financial Statements and Exhibits, Results of Operations and Financial Condition - 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): October 26, 2020 KOPPERS HOLDINGS INC. (Exact name of registrant as specified in its charter) Pennsylvania 1-32737 20-1878963 (State or other jurisdiction of incorporation) (Commissio

Koppers Holdings Inc. Reports Preliminary Third Quarter 2020 Results; Increases 2020 Outlook Record Quarter Diluted EPS from Continuing Operations of $1.83 vs. Prior Year of $0.86 Record Quarter Adjusted EPS of $1.64 vs. Prior Year of $1.16 Reduced T

Exhibit 99.1 Koppers Holdings Inc. 436 Seventh Avenue Pittsburgh, PA 15219-1800 Tel 412 227 2001 www.koppers.com News Release FOR IMMEDIATE RELEASE For Information: Michael J. Zugay, Chief Financial Officer 412 227 2231 [email protected] Koppers Holdings Inc. Reports Preliminary Third Quarter 2020 Results; Increases 2020 Outlook Record Quarter Diluted EPS from Continuing Operations of $1.83 vs.

Koppers Holdings Inc. Announces Completion of KJCC Sale

Exhibit 99.1 Koppers Holdings Inc. 436 Seventh Avenue Pittsburgh, PA 15219-1800 Tel 412 227 2001 www.koppers.com News Release FOR IMMEDIATE RELEASE For Information: Michael J. Zugay, Chief Financial Officer 412 227 2231 [email protected] Koppers Holdings Inc. Announces Completion of KJCC Sale PITTSBURGH, September 30, 2020 – Koppers Holdings Inc. (NYSE: KOP), an integrated global provider of tre

Financial Statements and Exhibits - 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): September 30, 2020 KOPPERS HOLDINGS INC. (Exact name of registrant as specified in its charter) Pennsylvania 1-32737 20-1878963 (State or other jurisdiction of incorporation) (Commiss

Koppers Holdings Inc. Provides August 2020 Business Update Increases 2020 Outlook; Provides September Quarter Outlook

Exhibit 99.1 Koppers Holdings Inc. 436 Seventh Avenue Pittsburgh, PA 15219-1800 Tel 412 227 2001 www.koppers.com News Release FOR IMMEDIATE RELEASE For Information: Michael J. Zugay, Chief Financial Officer 412 227 2231 [email protected] Koppers Holdings Inc. Provides August 2020 Business Update Increases 2020 Outlook; Provides September Quarter Outlook PITTSBURGH, September 22, 2020 – Koppers H

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): September 22, 2020 KOPPERS HOLDIN

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): September 22, 2020 KOPPERS HOLDINGS INC. (Exact name of registrant as specified in its charter) Pennsylvania 1-32737 20-1878963 (State or other jurisdiction of incorporation) (Commiss

Koppers Holdings Inc. Provides July 2020 Business Update; Reaffirms 2020 Outlook Increasing Capacity at North Little Rock Facility to Position Rail Business for Market Share Gains

Exhibit 99.1 Koppers Holdings Inc. 436 Seventh Avenue Pittsburgh, PA 15219-1800 Tel 412 227 2001 www.koppers.com News Release FOR IMMEDIATE RELEASE For Information: Michael J. Zugay, Chief Financial Officer 412 227 2231 [email protected] Koppers Holdings Inc. Provides July 2020 Business Update; Reaffirms 2020 Outlook Increasing Capacity at North Little Rock Facility to Position Rail Business for

Financial Statements and Exhibits - 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): August 25, 2020 KOPPERS HOLDINGS INC. (Exact name of registrant as specified in its charter) Pennsylvania 1-32737 20-1878963 (State or other jurisdiction of incorporation) (Commission

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): August 5, 2020 KOPPERS HOLDINGS INC. (Exact name of registrant as specified in its charter) Pennsylvania 1-32737 20-1878963 (State or other jurisdiction of incorporation) (Commission

Koppers Holdings Inc. Reports Second Quarter 2020 Results

Exhibit 99.1 Koppers Holdings Inc. 436 Seventh Avenue Pittsburgh, PA 15219-1800 Tel 412 227 2001 www.koppers.com News Release FOR IMMEDIATE RELEASE For Information: Michael J. Zugay, Chief Financial Officer 412 227 2231 [email protected] Koppers Holdings Inc. Reports Second Quarter 2020 Results PITTSBURGH, August 5, 2020 – Koppers Holdings Inc. (NYSE: KOP), an integrated global provider of treat

Quarterly Report - 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2020 Commission file number 1-32737 KOPPERS HOLDINGS INC. (Exact name of registrant as specified in its charter) Pennsylvania 20-1878963 (State of incorporation) (IRS Employer Identification

Koppers Holdings Inc. Reports Preliminary Second Quarter 2020 Results; Provides 2020 Outlook Q2 2020 Consolidated Sales of $437 Million vs. $444 Million in Prior Year Performance Chemicals Record Quarter Sales of $137 Million in Q2 2020 vs. $121 Mill

Exhibit 99.1 Koppers Holdings Inc. 436 Seventh Avenue Pittsburgh, PA 15219-1800 Tel 412 227 2001 www.koppers.com News Release FOR IMMEDIATE RELEASE For Information: Michael J. Zugay, Chief Financial Officer 412 227 2231 [email protected] Koppers Holdings Inc. Reports Preliminary Second Quarter 2020 Results; Provides 2020 Outlook Q2 2020 Consolidated Sales of $437 Million vs. $444 Million in Prio

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): July 27, 2020 KOPPERS HOLDINGS INC. (Exact name of registrant as specified in its charter) Pennsylvania 1-32737 20-1878963 (State or other jurisdiction of incorporation) (Commission F

Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): June 17, 2020 KOPPERS HOLDINGS INC. (Exact name of registrant as specified in its charter) Pennsylvania 1-32737 20-1878963 (State or other jurisdiction of incorporation) (Commission F

Koppers Holdings Inc. Provides May 2020 Business Update Strategic Actions to Realize Sales Growth and Optimize Wood-Treatment Network Long-Term Contract Extension with Class I Customer Ceasing Production Activities at Denver Facility; Investing in Tr

Exhibit 99.1 Koppers Holdings Inc. 436 Seventh Avenue Pittsburgh, PA 15219-1800 Tel 412 227 2001 www.koppers.com News Release FOR IMMEDIATE RELEASE For Information: Michael J. Zugay, Chief Financial Officer 412 227 2231 [email protected] Koppers Holdings Inc. Provides May 2020 Business Update Strategic Actions to Realize Sales Growth and Optimize Wood-Treatment Network Long-Term Contract Extensi

Koppers Holdings Inc. Provides First in a Series of Monthly Updates Business Trends in Line with Management Expectations April 2020 Sales of $136 Million, Compared with $152 Million in Prior Year

Exhibit 99.1 Koppers Holdings Inc. 436 Seventh Avenue Pittsburgh, PA 15219-1800 Tel 412 227 2001 www.koppers.com News Release FOR IMMEDIATE RELEASE For Information: Michael J. Zugay, Chief Financial Officer 412 227 2231 [email protected] Koppers Holdings Inc. Provides First in a Series of Monthly Updates Business Trends in Line with Management Expectations April 2020 Sales of $136 Million, Compa

Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): May 20, 2020 KOPPERS HOLDINGS INC. (Exact name of registrant as specified in its charter) Pennsylvania 1-32737 20-1878963 (State or other jurisdiction of incorporation) (Commission Fi

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits, Results of Operations and Financial Condition, Submission of Matters to a Vote of Security Holders

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): May 6, 2020 KOPPERS HOLDINGS INC. (Exact name of registrant as specified in its charter) Pennsylvania 1-32737 20-1878963 (State or other jurisdiction of incorporation) (Commission Fil

Koppers Holdings Inc. Reports First Quarter 2020 Results

Exhibit 99.1 Koppers Holdings Inc. 436 Seventh Avenue Pittsburgh, PA 15219-1800 Tel 412 227 2001 www.koppers.com News Release FOR IMMEDIATE RELEASE For Information: Michael J. Zugay, Chief Financial Officer 412 227 2231 [email protected] Koppers Holdings Inc. Reports First Quarter 2020 Results PITTSBURGH, May 7, 2020 – Koppers Holdings Inc. (NYSE: KOP), an integrated global provider of treated w

Quarterly Report - 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2020 Commission file number 1-32737 KOPPERS HOLDINGS INC. (Exact name of registrant as specified in its charter) Pennsylvania 20-1878963 (State of incorporation) (IRS Employer Identificatio

Koppers Holdings Inc. 2020 Long Term Incentive Plan

EX-99.1 Exhibit 99.1 KOPPERS HOLDINGS INC. 2020 LONG TERM INCENTIVE PLAN AS ADOPTED EFFECTIVE March 16, 2020 Section 1. Purpose The purposes of the Koppers Holdings Inc. 2020 Long Term Incentive Plan (the “Plan”) are to encourage selected individuals in the service of Koppers Holdings Inc. (together with any successor thereto, the “Company”) and its Affiliates (as defined below) to acquire a propr

- FORM S-8

Form S-8 Registration No. 333- As filed with the Securities and Exchange Commission on May 6, 2020 UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM S-8 REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933 Koppers Holdings Inc. (Exact name of registrant as specified in its charter) Pennsylvania 20-1878963 (State or other jurisdiction of incorporation or organization) (I

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): April 27, 2020 KOPPERS HOLDINGS INC. (Exact name of registrant as specified in its charter) Pennsylvania 1-32737 20-1878963 (State or other jurisdiction of incorporation) (Commission

Koppers Holdings Inc. Announces COVID-19 Communication Plan; Also Reports Preliminary First Quarter 2020 Results

Exhibit 99.1 Koppers Holdings Inc. 436 Seventh Avenue Pittsburgh, PA 15219-1800 Tel 412 227 2001 www.koppers.com News Release FOR IMMEDIATE RELEASE For Information: Michael J. Zugay, Chief Financial Officer 412 227 2231 [email protected] Koppers Holdings Inc. Announces COVID-19 Communication Plan; Also Reports Preliminary First Quarter 2020 Results PITTSBURGH, April 27, 2020 – Koppers Holdings I

- DEFA14A

DEFA14A UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. ) Filed by the Registrant ☒ Filed by a Party other than the Registrant ☐ Check the appropriate box: ☐ Preliminary Proxy Statement ☐ Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2))

KOP / Kopper Holdings, Inc. DEF 14A - - NOTICE & PROXY STATEMENT

Notice & Proxy Statement Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.

Entry into a Material Definitive Agreement, Financial Statements and Exhibits, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): February 26, 2020 KOPPERS HOLDINGS INC. (Exact name of registrant as specified in its charter) Pennsylvania 1-32737 20-1878963 (State or other jurisdiction of incorporation) (Commissi

Form of Restricted Stock Unit Issuance Agreement – Time Vesting

Exhibit 10.38 KOPPERS HOLDINGS INC. RESTRICTED STOCK UNIT ISSUANCE AGREEMENT – TIME VESTING RECITALS A.The Board has adopted the Plan for the purpose of retaining the services of selected Employees, non-employee members of the Board (or the board of directors of any Parent or Subsidiary) and consultants and other independent advisors who provide services to the Corporation (or any Parent or Subsid

Annual Report - 10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-K ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2019 Commission file number 1-32737 KOPPERS HOLDINGS INC. (Exact name of registrant as specified in its charter) Pennsylvania 20-1878963 (State of incorporation) (IRS Employer Identification No.

Form of Restricted Stock Unit Issuance Agreement for Steven R. Lacy

Exhibit 10.41 Steven R. Lacy KOPPERS HOLDINGS INC. RESTRICTED STOCK UNIT ISSUANCE AGREEMENT – TIME VESTING RECITALS A.The Board has adopted the Plan for the purpose of retaining the services of selected Employees, non-employee members of the Board (or the board of directors of any Parent or Subsidiary) and consultants and other independent advisors who provide services to the Corporation (or any P

At Market Issuance Sales Agreement, dated as of February 27, 2020, by and between Koppers Holdings Inc. and B. Riley FBR, Inc.

EX-1.1 Exhibit 1.1 KOPPERS HOLDINGS INC. Common Stock (par value $0.01 per share) At Market Issuance Sales Agreement February 27, 2020 B. Riley FBR, Inc. 299 Park Avenue, 21st Floor New York, NY 10171 Ladies and Gentlemen: Koppers Holdings Inc., a Pennsylvania corporation (the “Company”), confirms its agreement (this “Agreement”) with B. Riley FBR, Inc. (the “Agent”) as follows: 1. Issuance and Sa

Form of Notice of Grant of Stock Option

Exhibit 10.40 KOPPERS HOLDINGS INC. NOTICE OF GRANT OF STOCK OPTION Notice is hereby given of the following option grant (the “Option”) to purchase shares of the Common Stock of Koppers Holdings Inc. (the “Company”): Optionee: Grant Date: [] Vesting Commencement Date: [] Exercise Price: Number of Option Shares: Expiration Date: [] Type of Option: Incentive Stock Option X Non-Qualified Stock Option

Form of Restricted Stock Unit Issuance Agreement – Performance Vesting

Exhibit 10.39 KOPPERS HOLDINGS INC. RESTRICTED STOCK UNIT ISSUANCE AGREEMENT- Performance vesting RECITALS A. The Board has adopted the Plan for the purpose of retaining the services of selected Employees, non-employee members of the Board (or the board of directors of any Parent or Subsidiary) and consultants and other independent advisors who provide services to the Corporation (or any Parent or

Form of Form T-1 Statement of Eligibility under the Trust Indenture Act of 1939 for the Senior Debt Indenture Trustee.

EX-25.1 Exhibit 25.1 UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM T-1 STATEMENT OF ELIGIBILITY UNDER THE TRUST INDENTURE ACT OF 1939 OF A CORPORATION DESIGNATED TO ACT AS TRUSTEE CHECK IF AN APPLICATION TO DETERMINE ELIGIBILITY OF A TRUSTEE PURSUANT TO SECTION 305(b) (2) WELLS FARGO BANK, NATIONAL ASSOCIATION (Exact name of trustee as specified in its charter) A Nat

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): February 27, 2020 KOPPERS HOLDINGS INC. (Exact name of registrant as specified in its charter) Pennsylvania 1-32737 20-1878963 (State or other jurisdiction of incorporation) (Commissi

Description of Registrant’s Securities Registered Pursuant to Section 12 of the Securities Exchange Act of 1934

Exhibit 4.4 DESCRIPTION OF THE REGISTRANT'S SECURITIES REGISTERED PURSUANT TO SECTION 12 OF THE SECURITIES EXCHANGE ACT OF 1934 The following description sets forth certain material terms and provisions of the securities of Koppers Holdings Inc. (the “Company”) that are registered under Section 12 of the Securities Exchange Act of 1934, as amended. This description also summarizes certain relevant

Form of Form T-1 Statement of Eligibility under the Trust Indenture Act of 1939 for the Subordinated Debt Indenture Trustee.

EX-25.2 Exhibit 25.2 UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM T-1 STATEMENT OF ELIGIBILITY UNDER THE TRUST INDENTURE ACT OF 1939 OF A CORPORATION DESIGNATED TO ACT AS TRUSTEE CHECK IF AN APPLICATION TO DETERMINE ELIGIBILITY OF A TRUSTEE PURSUANT TO SECTION 305(b) (2) WELLS FARGO BANK, NATIONAL ASSOCIATION (Exact name of trustee as specified in its charter) A Nat

Powers of Attorney.

Exhibit 24 KOPPERS HOLDINGS INC. POWER OF ATTORNEY (10-K) I, Stephen R. Tritch, a Director of Koppers Holdings Inc. (the “Corporation”), a Pennsylvania corporation, hereby constitute and appoint Leroy M. Ball, Jr., Michael J. Zugay and Bradley A. Pearce, or any of them, my true and lawful attorneys or attorneys-in-fact, with the full power of substitution and revocation, (i)to sign, in my name and

KOP / Kopper Holdings, Inc. S-3ASR - - S-3ASR

S-3ASR Table of Contents As filed with the Securities and Exchange Commission on February 27, 2020 Registration No.

List of subsidiaries of the Company.

Exhibit 21 KOPPERS HOLDINGS INC. SUBSIDIARIES OF THE COMPANY Name* Jurisdiction of Incorporation/Formation Koppers Inc. Pennsylvania Koppers Asia LLC Delaware Cox Wood of Alabama, LLC Alabama Koppers Delaware, Inc. Delaware Koppers World-Wide Ventures Corporation Delaware Koppers Ventures Inc. Delaware Koppers Railroad Structures Inc. Delaware Koppers Recovery Resources LLC Kansas Koppers Performa

Fourth Amendment to Credit Agreement, dated as of February 26, 2020, by and among Koppers Inc., as Borrower, the Guarantors party thereto, the Lenders party thereto and PNC Bank, National Association, as Administrative Agent.

EX-10.1 Exhibit 10.1 FOURTH AMENDMENT TO CREDIT AGREEMENT THIS FOURTH AMENDMENT TO CREDIT AGREEMENT (the “Amendment”), dated as of February 26, 2020 (“Fourth Amendment Closing Date”) is made by and among KOPPERS INC., a Pennsylvania corporation (the “Borrower”), the GUARANTORS (as defined in the Credit Agreement (as hereinafter defined)), the LENDERS (as defined in the Credit Agreement), and PNC B

KOPPERS HOLDINGS INC. Up to $100,000,000 Common Stock

Table of Contents Filed Pursuant to Rule 424(b)(3) Registration No. 333-236678 CALCULATION OF REGISTRATION FEE Title of each class of securities offered Amount to be registered Maximum offering price per unit Maximum aggregate offering price Amount of registration fee(1) Common Stock, par value $0.01 per share (1) (2) $100,000,000 $12,980.00(3) (1) There are being registered hereunder such indeter

Koppers Holdings Inc. Reports Fourth Quarter and Full-Year 2019 Results 2019 Sales of $1.773 Billion Represents Record; Third Consecutive Year of Growth 2019 Operating Profit of $130.8 Million vs. Prior Year of $110.4 Million 2019 Net Income of $66.6

Exhibit 99.1 Koppers Holdings Inc. 436 Seventh Avenue Pittsburgh, PA 15219-1800 Tel 412 227 2001 www.koppers.com News Release FOR IMMEDIATE RELEASE For Information: Michael J. Zugay, Chief Financial Officer 412 227 2231 [email protected] Koppers Holdings Inc. Reports Fourth Quarter and Full-Year 2019 Results 2019 Sales of $1.773 Billion Represents Record; Third Consecutive Year of Growth 2019 Op

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): February 18, 2020 KOPPERS HOLDINGS INC. (Exact name of registrant as specified in its charter) Pennsylvania 1-32737 20-1878963 (State or other jurisdiction of incorporation) (Commissi

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): February 18, 2020 KOPPERS HOLDINGS INC. (Exact name of registrant as specified in its charter) Pennsylvania 1-32737 20-1878963 (State or other jurisdiction of incorporation) (Commissi

Koppers Announces Agreement to Sell China Distillation Business; Also Reports Preliminary Fourth Quarter 2019 Results Aligns with Long-Term Strategy to Focus on Critical Wood Infrastructure

Exhibit 99.1 Koppers Holdings Inc. 436 Seventh Avenue Pittsburgh, PA 15219-1800 Tel 412 227 2001 www.koppers.com News Release FOR IMMEDIATE RELEASE For Information: Michael J. Zugay, Chief Financial Officer and Treasurer 412 227 2231 [email protected] Koppers Announces Agreement to Sell China Distillation Business; Also Reports Preliminary Fourth Quarter 2019 Results Aligns with Long-Term Strate

Koppers Announces Retirement of Steven R. Lacy, Chief Administrative Officer, General Counsel and Secretary, Effective Year-End 2020 Stephanie L. Apostolou Elected General Counsel and Secretary

Exhibit 99.1 Koppers Holdings Inc. 436 Seventh Avenue Pittsburgh, PA 15219-1800 Tel 412 227 2001 www.koppers.com News Release FOR IMMEDIATE RELEASE For Information: Michael J. Zugay, Chief Financial Officer and Treasurer 412 227 2231 [email protected] Koppers Announces Retirement of Steven R. Lacy, Chief Administrative Officer, General Counsel and Secretary, Effective Year-End 2020 Stephanie L.

KOP / Kopper Holdings, Inc. / SOUTHERNSUN ASSET MANAGEMENT, LLC - SCHEDULE 13G Passive Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 SCHEDULE 13G UNDER THE SECURITIES EXCHANGE ACT OF 1934 Koppers Holdings Inc. (Name of Issuer) Common (Title of Class of Securities) 50060P106 (CUSIP Number) December 31, 2019 (Date of Event Which Requires Filing of this Statement) Check the appropriate box to designate the rule pursuant to which this Schedule is filed: ☒ Rule

KOP / Kopper Holdings, Inc. / VANGUARD GROUP INC - SCHEDULE 13G/A Passive Investment

SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 13G Under the Securities Exchange Act of 1934 (Amendment No.: 1)* Name of issuer: Koppers Holdings Inc Title of Class of Securities: Common Stock CUSIP Number: 50060P106 Date of Event Which Requires Filing of this Statement: December 31, 2019 Check the appropriate box to designate the rule pursuant to which this Schedule is filed:

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): January 1, 2020 KOPPERS HOLDINGS INC. (Exact name of registrant as specified in its charter) Pennsylvania 1-32737 20-1878963 (State or other jurisdiction of incorporation) (Commission

Koppers Announces Leadership Changes James A. Sullivan, Executive Vice President and Chief Operating Officer; Leslie S. Hyde, Senior Vice President and Chief Sustainability Officer

Exhibit 99.1 Koppers Holdings Inc. 436 Seventh Avenue Pittsburgh, PA 15219-1800 Tel 412 227 2001 www.koppers.com News Release FOR IMMEDIATE RELEASE For Information: Michael J. Zugay, Chief Financial Officer and Treasurer 412 227 2231 [email protected] Koppers Announces Leadership Changes James A. Sullivan, Executive Vice President and Chief Operating Officer; Leslie S. Hyde, Senior Vice Presiden

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): November 7, 2019 KOPPERS HOLDINGS INC. (Exact name of registrant as specified in its charter) Pennsylvania 1-32737 20-1878963 (State or other jurisdiction of incorporation) (Commissio

Koppers Holdings Inc. Reports Third Quarter 2019 Results Record Sales Quarter Driven by Organic Growth; Strong Third-Quarter Profitability Q3 2019 Diluted EPS of $0.94 vs. Prior Year of $0.35 Adjusted Q3 2019 EPS of $1.24 vs. Prior Year of $0.73 2019

Exhibit 99.1 Koppers Holdings Inc. 436 Seventh Avenue Pittsburgh, PA 15219-1800 Tel 412 227 2001 www.koppers.com News Release FOR IMMEDIATE RELEASE For Information: Michael J. Zugay, Chief Financial Officer and Treasurer 412 227 2231 [email protected] Koppers Holdings Inc. Reports Third Quarter 2019 Results Record Sales Quarter Driven by Organic Growth; Strong Third-Quarter Profitability Q3 2019

Quarterly Report - 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2019 Commission file number 1-32737 KOPPERS HOLDINGS INC. (Exact name of registrant as specified in its charter) Pennsylvania 20-1878963 (State of incorporation) (IRS Employer Identific

KOP / Kopper Holdings, Inc. / Division of Investment, Department of the Treasury, State of New Jersey - DIVISION OF INVESTMENT, DEPARTMENT OF THE TREASURY,STATE OF NEW JERSEY Passive Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. 2)* Koppers Holdings Inc. (Name of Issuer) Common Stock, $0.01 par value (Title of Class of Securities) 50060P106 (CUSIP Number) September 19, 2019 (Date of Event which Requires Filing of this Statement) Check the appropriate box to designate the rule pursua

Koppers Holdings Inc. Reports Second Quarter 2019 Results Record Sales Quarter and Margin Expansion from Wood-Preservation Businesses Q2 2019 Diluted EPS of $0.70 vs. Prior Year of $0.03 Adjusted Q2 2019 EPS of $1.16 vs. Prior Year of $0.93 2019 Guid

Exhibit 99.1 Koppers Holdings Inc. 436 Seventh Avenue Pittsburgh, PA 15219-1800 Tel 412 227 2001 www.koppers.com News Release FOR IMMEDIATE RELEASE For Information: Michael J. Zugay, Chief Financial Officer and Treasurer 412 227 2231 [email protected] Koppers Holdings Inc. Reports Second Quarter 2019 Results Record Sales Quarter and Margin Expansion from Wood-Preservation Businesses Q2 2019 Dilu

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): August 8, 2019 KOPPERS HOLDINGS INC. (Exact name of registrant as specified in its charter) Pennsylvania 1-32737 20-1878963 (State or other jurisdiction of incorporation) (Commission

Quarterly Report - 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2019 Commission file number 1-32737 KOPPERS HOLDINGS INC. (Exact name of registrant as specified in its charter) Pennsylvania 20-1878963 (State of incorporation) (IRS Employer Identification

Koppers Holdings Inc. Reports First Quarter 2019 Results First-Quarter Record Sales and Margin Expansion from Wood-Preservation Businesses Q1 2019 Diluted EPS of $0.55 vs. Prior Year of $0.81 Adjusted Q1 2019 EPS of $0.62 vs. Prior Year of $1.18 2019

Exhibit 99.1 Koppers Holdings Inc. 436 Seventh Avenue Pittsburgh, PA 15219-1800 Tel 412 227 2001 www.koppers.com News Release FOR IMMEDIATE RELEASE For Information: Michael J. Zugay, Chief Financial Officer and Treasurer 412 227 2231 [email protected] Koppers Holdings Inc. Reports First Quarter 2019 Results First-Quarter Record Sales and Margin Expansion from Wood-Preservation Businesses Q1 2019

Financial Statements and Exhibits, Results of Operations and Financial Condition, Submission of Matters to a Vote of Security Holders

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): May 3, 2019 KOPPERS HOLDINGS INC. (Exact name of registrant as specified in its charter) Pennsylvania 1-32737 20-1878963 (State or other jurisdiction of incorporation) (Commission Fil

Quarterly Report - 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2019 Commission file number 1-32737 KOPPERS HOLDINGS INC. (Exact name of registrant as specified in its charter) Pennsylvania 20-1878963 (State of incorporation) (IRS Employer Identificatio

Third Amendment to Credit Agreement and Joinder, dated as of May 1, 2019, by and among Koppers Inc., as Borrower, the Guarantors party thereto, the Lenders party thereto, and PNC Bank National Association, as Administrative Agent.

Exhibit 10.126 THIRD AMENDMENT TO CREDIT AGREEMENT THIS THIRD AMENDMENT TO CREDIT AGREEMENT (the “Amendment”), dated as of May 1, 2019 (the “Third Amendment Closing Date”), is made by and among Koppers Inc., a Pennsylvania corporation (the “Borrower”), the Guarantors (as defined in the Credit Agreement (as hereinafter defined)), the LENDERS (as defined in the Credit Agreement), and PNC Bank, Natio

KOP / Kopper Holdings, Inc. / VANGUARD GROUP INC Passive Investment

koppersholdingsinc.htm - Generated by SEC Publisher for SEC Filing SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 13G Under the Securities Exchange Act of 1934 (Amendment No.: 0 )* Name of issuer: Koppers Holdings Inc Title of Class of Securities: Common Stock CUSIP Number: 50060P106 Date of Event Which Requires Filing of this Statement: March 29, 2019 Check the appropriate box

KOP / Kopper Holdings, Inc. NOTICE & PROXY STATEMENT

DEF 14A 1 d655324ddef14a.htm NOTICE & PROXY STATEMENT Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. ) Filed by the Registrant ☒ Filed by a Party other than the Registrant ☐ Check the appropriate box: ☐ Preliminary Proxy Statement ☐ Confidential, f

Koppers Holdings Inc. Reports Fourth Quarter and Full-Year 2018 Results 2018 Operating Profit of $110.4 Million vs. Prior Year of $123.6 Million 2018 Net Income of $23.4 Million vs. Prior Year of $29.1 Million 2018 Adjusted EBITDA of $221.6 Million v

Exhibit 99.1 Koppers Holdings Inc. 436 Seventh Avenue Pittsburgh, PA 15219-1800 Tel 412 227 2001 www.koppers.com News Release FOR IMMEDIATE RELEASE For Information: Michael J. Zugay, Chief Financial Officer and Treasurer 412 227 2231 [email protected] Koppers Holdings Inc. Reports Fourth Quarter and Full-Year 2018 Results 2018 Operating Profit of $110.4 Million vs. Prior Year of $123.6 Million 2

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): March 1, 2019 KOPPERS HOLDINGS INC. (Exact name of registrant as specified in its charter) Pennsylvania 1-32737 20-1878963 (State or other jurisdiction of incorporation) (Commission F