Koppers 8-K: Q3 2025 results press release furnished as Exhibit 99.1

Rhea-AI Filing Summary

Koppers Holdings Inc. furnished an 8-K to disclose that it issued a press release announcing its third quarter 2025 results. The company states the press release is included as Exhibit 99.1 and furnished under Item 2.02, Results of Operations and Financial Condition.

The filing is dated November 7, 2025. Additional materials include Exhibit 104, the cover page interactive data file embedded within the Inline XBRL document.

8-K Event Classification

2 items: 2.02, 9.01

2 items

Item 2.02 Results of Operations and Financial Condition Financial

Disclosure of earnings results, typically an earnings press release or preliminary financials.

Item 9.01 Financial Statements and Exhibits Exhibits

Financial statements, pro forma financial information, and exhibit attachments filed with this report.

Understanding 8-K Material Events →

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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, 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 File Number)			(IRS Employer 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)

o			Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)
o			Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)
o			Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))
o			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 o

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. o

Item 2.02 Results of Operations and Financial Condition.

On November 7, 2025 we issued a press release announcing third quarter of 2025 results. A copy of the press release is included in this Current Report on Form 8-K as Exhibit 99.1 and is furnished herewith.

Item 9.01 Financial Statements and Exhibits.

(d)Exhibits.

99.1						Press Release dated November 7, 2025
104						Cover Page Interactive Data File (embedded within the Inline XBRL document).

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: November 7, 2025

			KOPPERS HOLDINGS INC.
			By:						/s/ Jimmi Sue Smith
									Jimmi Sue Smith
									Chief Financial Officer and Treasurer

FAQ

What did Koppers (KOP) announce in this 8-K?

The company disclosed that it issued a press release announcing third quarter 2025 results, furnished as Exhibit 99.1 under Item 2.02.

Which period’s results are referenced by Koppers (KOP)?

The press release concerns the company’s third quarter of 2025 results.

When was the event reported by Koppers (KOP)?

The date of the report and earliest event reported is November 7, 2025.

What exhibits are included in the Koppers (KOP) 8-K?

The filing lists Exhibit 99.1 (press release dated November 7, 2025) and Exhibit 104 (cover page Interactive Data File).

Is the press release filed or furnished by Koppers (KOP)?

The press release is furnished under Item 2.02, not filed.