# EDGAR Filing Document

**Accession Number:** 0001315257
**File Stem:** 0001315257-26-000030
**Filing Date:** 2026-5
**Character Count:** 5384
**Document Hash:** fd530217375e628cfe58d578956ec2ef
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001315257-26-000030.hdr.sgml**: 20260507

**ACCESSION NUMBER**: 0001315257-26-000030

**CONFORMED SUBMISSION TYPE**: 8-K/A

**PUBLIC DOCUMENT COUNT**: 11

**CONFORMED PERIOD OF REPORT**: 20251105

**ITEM INFORMATION**: Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers: Compensatory Arrangements of Certain Officers

**ITEM INFORMATION**: Financial Statements and Exhibits

**FILED AS OF DATE**: 20260507

**DATE AS OF CHANGE**: 20260507

**FILER**: 

**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

**FILING VALUES:**
- **FORM TYPE:** 8-K/A
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-32737
- **FILM NUMBER:** 26953661

**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

?xml version='1.0' encoding='ASCII'? kop-20251105

**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): November 5, 2025**

_________________________________________________________

**KOPPERS HOLDINGS INC.**

**(Exact name of registrant as specified in its charter)**

_________________________________________________________

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| | | |
|:---|:---|:---|
| **Pennsylvania** | **1-32737** | **20-1878963** |
| **(State or other jurisdiction<br>of incorporation)** | **(Commission File Number)** | **(IRS Employer<br>Identification No.)** |
| **436 Seventh Avenue** | | |
| **Pittsburgh, Pennsylvania** | | **15219** |
| **(Address of principal executive offices)** | | **(Zip Code)** |

---

**Registrant's telephone number, including area code: (412) 227-2001**

**Not Applicable**

**(Former name or former address, if changed since last report)**

_________________________________________________________

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions: (see General Instruction A.2. below)

□ Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

□ Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

□ Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

□ Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

---

| | | |
|:---|:---|:---|
| **Title of each class** | **Trading Symbol(s)** | **Name of each exchange on which registered** |
| Common Stock | KOP | The New York Stock Exchange |

---

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§ 230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§ 240.12b-2 of this chapter).

Emerging growth company □

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. □

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**Item 5.02 Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers.**

On November 5, 2025, Koppers Holdings Inc. (the "Company") filed a Current Report on Form 8-K (the "Original 8-K") to report, among other things, the election of Laura J. Posadas as a member of the Board of Directors (the "Board") of the Company, effective as of November 5, 2025. At the time the Original 8-K was filed, the Board had not determined the committees of the Board on which Ms. Posadas would serve.

This Current Report on Form 8-K/A is being filed as an amendment to the Original 8-K to report that on May 7, 2026, the Board appointed Ms. Posadas to serve as a member of its Audit Committee, Management Development and Compensation Committee and Strategy and Risk Committee, effective immediately.

**Item 9.01 Financial Statements and Exhibits.**

(d)Exhibits.

104 Cover Page Interactive Data File (embedded within the Inline XBRL document).

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SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

**Dated: May 7, 2026**

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| | |
|:---|:---|
| KOPPERS HOLDINGS INC. | KOPPERS HOLDINGS INC. |
| By: | /s/ Bradley A. Pearce |
|  | Bradley A. Pearce |
|  | Interim Chief Financial Officer and Treasurer and Chief Accounting Officer |

---