# EDGAR Filing Document

**Accession Number:** 0001315257
**File Stem:** 0002136316-26-000002
**Filing Date:** 2026-5
**Character Count:** 7298
**Document Hash:** aaacf8c597820a5cd05e6f60e1353530
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0002136316-26-000002.hdr.sgml**: 20260527

**ACCESSION NUMBER**: 0002136316-26-000002

**CONFORMED SUBMISSION TYPE**: 3

**PUBLIC DOCUMENT COUNT**: 4

**CONFORMED PERIOD OF REPORT**: 20260526

**FILED AS OF DATE**: 20260527

**DATE AS OF CHANGE**: 20260527

**REPORTING-OWNER**: 

**OWNER DATA:**
- **COMPANY CONFORMED NAME:** Brenner Eric D.
- **CENTRAL INDEX KEY:** 0002136316

**ORGANIZATION NAME:**

**FILING VALUES:**
- **FORM TYPE:** 3
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-32737
- **FILM NUMBER:** 261026164

**MAIL ADDRESS:**
- **STREET 1:** 436 SEVENTH AVENUE
- **STREET 2:** C/O KOPPERS HOLDINGS INC.
- **CITY:** PITTSBURGH
- **STATE:** PA
- **ZIP:** 15219
**ISSUER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** Koppers Holdings Inc.
- **CENTRAL INDEX KEY:** 0001315257
- **STANDARD INDUSTRIAL CLASSIFICATION:** LUMBER & WOOD PRODUCTS (NO FURNITURE) [2400]
- **ORGANIZATION NAME:** 04 Manufacturing
- **EIN:** 201878963
- **STATE OF INCORPORATION:** PA
- **FISCAL YEAR END:** 1231

**BUSINESS ADDRESS:**
- **STREET 1:** 436 SEVENTH AVENUE
- **CITY:** PITTSBURGH
- **STATE:** PA
- **ZIP:** 15219
- **BUSINESS PHONE:** 412-227-2001

**MAIL ADDRESS:**
- **STREET 1:** 436 SEVENTH AVENUE
- **CITY:** PITTSBURGH
- **STATE:** PA
- **ZIP:** 15219

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** KI Holdings Inc.
- **DATE OF NAME CHANGE:** 20050124

## Ex-24

![](ex-24poa001.jpg)

KOPPERS HOLDINGS INC. Limited Power of Attorney SECTION 16a FILINGS Know all by these presents, that the undersigned hereby constitutes and appoints each of Stephanie L. Apostolou, Andrew T. Tillapaugh and Bradley A. Pearce, signing singly, the undersigneds true and lawful attorney in fact to 1. Execute for and on behalf of the undersigned, in the undersigneds capacity as an officer, director and or stockholder of Koppers Holdings Inc. the Company, Forms 3, 4, and 5 and amendments thereto in accordance with Section 16a of the Securities Exchange Act of 1934 and the rules thereunder; 2. Do and perform any and all acts for and on behalf of the undersigned which may be necessary or desirable to complete and execute any such Form 3, 4, or 5 or amendment thereto including, but not limited to, executing a Form ID and or Authentication Document, and timely file such forms or documents with the United States Securities and Exchange Commission the SEC and any stock exchange or similar authority; and 3. Take any other action of any type whatsoever which, in the opinion of such attorney in fact, may be necessary or desirable in connection with the foregoing authority, it being understood that the documents executed by such attorney in fact on behalf of the undersigned pursuant to this Power of Attorney shall be in such form and shall contain such terms and conditions as such attorney in fact may approve. The undersigned hereby grants to each such attorney in fact full power and authority to do and perform any and every act and thing whatsoever requisite, necessary, or proper to be done in the exercise of any of the rights and powers herein granted, as fully to all intents and purposes as the undersigned might or could do if personally present, with full power of substitution or revocation, hereby ratifying and confirming all that such attorney in fact, or such attorney in facts substitute or substitutes, shall lawfully do or cause to be done by virtue of this Power of Attorney and the rights and powers herein granted. The undersigned acknowledges that the foregoing attorneys in fact, in serving in such capacity at the request of the undersigned, are not assuming, nor is the Company assuming, any of the undersigneds responsibilities to comply with Section 16 of the Securities Exchange Act of 1934. This Power of Attorney shall remain in full force and effect until the undersigned is no longer required to file Forms 3, 4, and 5 with respect to the undersigneds holdings of and transaction in securities of the Company, unless earlier revoked by the undersigned in a signed writing delivered to the foregoing attorneys in fact. This Power of Attorney may be filed with the SEC as a confirming statement of the authority granted herein. IN WITNESS WHEREOF, the undersigned has caused this Power of Attorney to be executed as of this 26th day of April, 2026. Eric D. Brenner Print Name of Reporting Person or Entity

------

![](ex-24poa002.jpg)

/s/ Eric D. Brenner

------

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

## FORM 3

### INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

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

---

| | | |
|:---|:---|:---|
| **1. Name and Address of Reporting Person**<sup>*</sup><br>Brenner Eric D.<br><sub>(Last) (First) (Middle)</sub><br>436 SEVENTH AVENUE<br><sub>(Street)</sub><br>PITTSBURGH, PA 15219<br><sub>(City) (State) (Zip)</sub> | **3. Issuer Name and Ticker or Trading Symbol**<br>Koppers Holdings Inc. [ KOP ] | **5. If Amendment, Date of Original Filed (Month/Day/Year)**<br>  |
| **2. Date of Event Requiring Statement (Month/Day/Year)**<br>2026-05-26 | **4. Relationship of Reporting Person(s) to Issuer**<br>(Check all applicable)<br>[ ] Director   [ ] 10% Owner<br>[X] Officer (give title below)   [ ] Other (specify below)<br>_CFO and Treasurer_ | **6. Individual or Joint/Group Filing (Check Applicable Line)**<br>[X] Form filed by One Reporting Person<br>[ ] Form filed by More than One Reporting Person |

---

## Table I - Non-Derivative Securities Beneficially Owned

---

|  |  |  |  |
| --- | --- | --- | --- |
| 1. Title of Security | 2. Amount of Securities Beneficially Owned | 3. Ownership Form | 4. Nature of Indirect Beneficial Ownership |
| Common  Stock | 0 | D |  |

---

## Table II - Derivative Securities Beneficially Owned

---

|  |  |  |  |  |  |  |  |
| --- | --- | --- | --- | --- | --- | --- | --- |
| 1. Title of Derivative Security | 2. Date Exercisable and Expiration Date (Month/Day/Year) | 2. Date Exercisable and Expiration Date (Month/Day/Year) | 3. Title and Amount of Underlying Securities | 3. Title and Amount of Underlying Securities | 4. Conversion or Exercise Price | 5. Ownership Form | 6. Nature of Indirect Beneficial Ownership |
| 1. Title of Derivative Security | Date Exercisable | Expiration Date | Title | Amount or Number of Shares | 4. Conversion or Exercise Price | 5. Ownership Form | 6. Nature of Indirect Beneficial Ownership |
|  |  |  |  |  |  |  |  |

---

**Signature:** /s/ Stephanie L. Apostolou, Attorney in Fact  
**Date:** 2026-05-27

### Remarks:

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

* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).

** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).

Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.

**Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.**