Koppers Holdings INC. (KOP) — SEC Filings

Overview

Koppers Holdings INC. (KOP) is a publicly traded company tracked on ReadTheFiling. The most recent enriched filing is a 4 filed on Mar 25, 2026: This Form 4 filing, dated March 25, 2026, indicates that Sonja Michelle Wilkerson, a reporting person for Koppers Holdings Inc., has filed a statement of changes in beneficial ownership of securities. While the filing itself doesn't detail specific transactions, it signals that an insider's ownershi

Sentiment Summary

Across 32 filings, the sentiment breakdown is: 31 neutral, 1 mixed. The dominant filing sentiment for Koppers Holdings INC. is neutral.

Filing Type Overview

Koppers Holdings INC. (KOP) has filed 2 4, 2 8-K/A, 5 10-Q, 10 8-K, 1 DEFA14A, 2 DEF 14A, 2 10-K, 7 SC 13G/A, 1 SC 13G with the SEC between Jan 2024 to Mar 2026.

Filings by Year

2026 · 2025 · 2024

Recent Filings (32)

• Koppers Holdings Insider Files Form 4 on Ownership Changes — 4 · Mar 25, 2026
  This Form 4 filing, dated March 25, 2026, indicates that Sonja Michelle Wilkerson, a reporting person for Koppers Holdings Inc., has filed a statement of change
• Koppers Holdings Insider Ownership Change Filed by Neupaver — 4 · Mar 25, 2026
  This Form 4 filing, dated March 25, 2026, indicates a change in beneficial ownership for Albert J. Neupaver, a reporting insider at Koppers Holdings Inc. While
• 8-K/A Filing — 8-K/A · Dec 3, 2025
• Koppers' Q3 Net Income Rises, But YTD Profit Halved by Restructuring — 10-Q · Nov 7, 2025 Risk: high
  Koppers Holdings Inc. reported a mixed financial performance for the three and nine months ended September 30, 2025. For the three-month period, net income attr
• 8-K Filing — 8-K · Nov 5, 2025
• Koppers Holdings Inc. Files 8-K on Financials — 8-K · Aug 8, 2025 Risk: low
  Koppers Holdings Inc. filed an 8-K on August 8, 2025, reporting on its results of operations and financial condition. The filing includes financial statements a
• Koppers Holdings Inc. Enters Material Definitive Agreement — 8-K · Jun 18, 2025 Risk: medium
  Koppers Holdings Inc. entered into a material definitive agreement on June 17, 2025, related to a direct financial obligation. The filing details the creation o
• Koppers Holdings Inc. Announces Director Changes and Officer Compensation — 8-K · May 29, 2025 Risk: low
  Koppers Holdings Inc. announced on May 22, 2025, the departure of director Michael J. Riffle and the appointment of David M. Drees as a new director. The compan
• Koppers Holdings Inc. Files Q1 2025 10-Q — 10-Q · May 9, 2025 Risk: medium
  Koppers Holdings Inc. filed its 10-Q for the period ending March 31, 2025. The filing details financial performance and operational updates. Key financial data
• Koppers Holdings Inc. Files Supplemental Proxy Materials — DEFA14A · Apr 11, 2025 Risk: low
  Koppers Holdings Inc. filed a supplemental proxy statement on April 11, 2025, regarding its annual meeting. The filing is a definitive additional material and d
• Koppers Holdings Inc. DEF 14A: Executive Compensation Details — DEF 14A · Mar 28, 2025 Risk: low
  Koppers Holdings Inc. filed its DEF 14A on March 28, 2025, for the fiscal year ending December 31, 2024. The filing details executive compensation, including eq
• Koppers Holdings Inc. Files 2024 10-K — 10-K · Feb 27, 2025 Risk: medium
  Koppers Holdings Inc. filed its 2024 10-K on February 27, 2025, reporting its fiscal year ended December 31, 2024. The company, headquartered at 436 Seventh Ave
• Koppers Holdings Inc. Enters Material Definitive Agreement — 8-K · Dec 17, 2024 Risk: medium
  On December 17, 2024, Koppers Holdings Inc. entered into a material definitive agreement, creating a direct financial obligation. The company, incorporated in P
• Koppers Holdings Appoints New CFO, Mike Henderson — 8-K · Dec 9, 2024 Risk: medium
  Koppers Holdings Inc. announced on December 5, 2024, the appointment of Michael J. ("Mike") Henderson as Senior Vice President, Chief Financial Officer, and Tre
• Koppers Holdings Reports Exit/Disposal Activities — 8-K · Dec 5, 2024 Risk: medium
  Koppers Holdings Inc. filed an 8-K on December 5, 2024, to report on cost-associated exit or disposal activities. The filing also includes financial statements
• SC 13G/A Filing — SC 13G/A · Nov 8, 2024
• Koppers Holdings Q3 2024 10-Q Filed — 10-Q · Nov 8, 2024 Risk: medium
  Koppers Holdings Inc. filed its 10-Q for the period ending September 30, 2024. The filing details financial performance and operational segments, including Carb
• SC 13G/A Filing — SC 13G/A · Oct 18, 2024
• SC 13G/A Filing — SC 13G/A · Oct 7, 2024
• Koppers Holdings Inc. Files Q2 2024 10-Q — 10-Q · Aug 8, 2024 Risk: medium
  Koppers Holdings Inc. filed its 10-Q for the period ending June 30, 2024. The filing details financial performance across its operating segments, including Rail
• Koppers Holdings Inc. Files 10-Q for Period Ending March 31, 2024 — 10-Q · May 3, 2024 Risk: medium
  Koppers Holdings Inc. (KOP) filed a Quarterly Report (10-Q) with the SEC on May 3, 2024. Koppers Holdings Inc. filed a 10-Q report for the period ending March 3
• Koppers Holdings Inc. Files 8-K/A Amendment — 8-K/A · May 2, 2024 Risk: low
  Koppers Holdings Inc. filed an amendment (8-K/A) on May 02, 2024, to report on the departure of Director Robert W. Bauer and the election of new Director Michae
• Koppers Holdings Inc. Enters Material Definitive Agreement — 8-K · Apr 15, 2024 Risk: medium
  Koppers Holdings Inc. entered into a Material Definitive Agreement on April 12, 2024, which involves a direct financial obligation. The company, incorporated in
• Koppers Holdings Inc. Files Definitive Proxy Statement — DEF 14A · Apr 2, 2024 Risk: low
  Koppers Holdings Inc. (KOP) filed a Proxy Statement (DEF 14A) with the SEC on April 2, 2024. Koppers Holdings Inc. filed a DEF 14A form on April 2, 2024. The fi
• Koppers Holdings Inc. Files 2023 Annual Report on Form 10-K — 10-K · Feb 28, 2024 Risk: medium
  Koppers Holdings Inc. (KOP) filed a Annual Report (10-K) with the SEC on February 28, 2024. Koppers Holdings Inc. filed its 10-K report for the fiscal year endi
• SC 13G/A Filing — SC 13G/A · Feb 13, 2024
• Koppers Holdings Reports Officer Changes & Compensation on Feb 13 — 8-K · Feb 13, 2024 Risk: medium
  Koppers Holdings Inc. filed an 8-K on February 13, 2024, reporting events concerning the departure, election, or appointment of certain officers, along with det
• Rubric Capital Maintains 1.0M Share Stake in Koppers Holdings — SC 13G/A · Feb 12, 2024 Risk: low
  Rubric Capital Management LP, a Delaware-based investment firm, filed an amended SC 13G/A on February 12, 2024, disclosing its ownership of 1,007,341 shares of
• Fuller & Thaler Amends Koppers Holdings Stake to 2.05M Shares — SC 13G/A · Feb 12, 2024 Risk: low
  Fuller & Thaler Asset Management, Inc. filed an Amendment No. 10 to their Schedule 13G for Koppers Holdings Inc. on February 12, 2024, indicating their benefici
• Dimensional Fund Advisors LP Reports Passive Stake in Koppers Holdings Inc. — SC 13G · Feb 9, 2024 Risk: low
  Dimensional Fund Advisors LP, a Delaware Limited Partnership, has filed an SC 13G indicating its ownership in Koppers Holdings Inc. (KOP) as of December 29, 202
• BlackRock Amends Koppers Holdings Stake, Passive Investment — SC 13G/A · Jan 22, 2024
  BlackRock Inc. filed an amended SC 13G/A on January 22, 2024, indicating its ownership of Koppers Holdings Inc. common stock as of December 31, 2023. This filin
• Koppers Holdings 8-K: Officer/Director Changes, Comp Arrangements — 8-K · Jan 2, 2024
  Koppers Holdings Inc. filed an 8-K on January 2, 2024, reporting an event that occurred on January 1, 2024. This filing indicates a change in compensatory arran

Risk Profile

Risk Assessment: Of KOP's 22 recent filings, 1 were flagged as high-risk, 12 as medium-risk, and 9 as low-risk. The overall risk profile suggests moderate risk with a balanced mix of positive and cautionary disclosures.

Financial Highlights

Key financial metrics from Koppers Holdings INC.'s most recent 10-Q filing (Nov 7, 2025):

• Revenue: $1,446.6M
• Net Income: $26.3M
• EPS: $1.29
• Cash Position: $37.9M
• Operating Margin: 8.15%
• Total Assets: $1,894.8M

Key Executives

• Pittsburgh
• Michael J. Riffle
• David M. Drees
• Michael J. Henderson
• Mike Henderson
• Robert W. Bauer
• Michael L. M. Smith
• David Rosen

Industry Context

Koppers Holdings operates in the wood treatment and chemical manufacturing sectors. The industry is influenced by infrastructure spending, construction activity, and regulatory environments concerning chemical usage and environmental impact. Competitors may include other wood preservers and chemical suppliers, with market dynamics affected by raw material costs and demand from utilities, railroads, and construction.

Top Tags

10-Q (4) · financials (4) · amendment (4) · institutional-ownership (4) · material-definitive-agreement (3) · financial-obligation (3) · compensation (3) · Koppers Holdings (3) · form-4 (2) · ownership-change (2)

Key Numbers

• Net sales (Q3 2025): $485.3M — Decreased from $554.3M in Q3 2024
• Net sales (YTD 2025): $1,446.6M — Decreased from $1,615.1M in YTD 2024
• Net income attributable to Koppers (Q3 2025): $23.8M — Increased from $22.8M in Q3 2024
• Net income attributable to Koppers (YTD 2025): $26.3M — Decreased significantly from $62.6M in YTD 2024
• Impairment and restructuring charges (YTD 2025): $47.8M — Increased from $0.0M in YTD 2024
• Loss on pension settlement (YTD 2025): $29.0M — New charge in YTD 2025
• Net cash provided by operating activities (YTD 2025): $77.4M — Increased from $44.7M in YTD 2024
• Repurchases of Common Stock (YTD 2025): $33.3M — Part of net cash used in financing activities
• Common Stock shares outstanding: 19,613,926 — As of October 31, 2025
• Acquisition of Brown Wood Preserving Company, Inc.: $100M — Completed on April 1, 2024
• Reporting Period End: 2025-03-31 — Financial reporting date
• Previous Year End: 2024-12-31 — Comparison point for financial data
• Q1 2024 Period: 2024-01-01 to 2024-03-31 — Comparative period for financial results
• Q1 2025 Period: 2025-01-01 to 2025-03-31 — Current period for financial results
• Filing Date: 20250411 — Date the supplemental proxy materials were filed with the SEC.

Forward-Looking Statements

• {"claim":"Rubric Capital Management LP will maintain a significant stake in Koppers Holdings Inc. for the foreseeable future.","entity":"Rubric Capital Management LP","targetDate":"December 31, 2024","confidence":"medium"}
• {"claim":"Fuller & Thaler Asset Management, Inc. will maintain a significant stake in Koppers Holdings Inc. for the foreseeable future.","entity":"Fuller & Thaler Asset Management, Inc.","targetDate":"December 31, 2024","confidence":"medium"}

Frequently Asked Questions