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KOPNYSE
Koppers Holdings Inc.
Lumber & Wood Products (No Furniture) · PA · CIK 1315257
Koppers Holdings Inc. manages commodity, interest rate, and foreign currency risks to minimize volatility in earnings and cash flows
red 8-K · 90d
$835M
Market cap
$45.36
Last close
+0.5%
1D
+2.1%
5D
158K
Volume
Price · last 39 sessions+13.9%
May 4L $38.31 · H $45.36Jun 29
180
Total filings
May 11, 2026
Last filing
12/31
Fiscal year end
SC 13DSC 13DMay 19, 20268-KExecutive Change · Reg FD DisclosureMay 11, 202610-Q10-QMay 8, 20268-KExecutive Change · Results of OperationsMay 8, 20268-K/AExecutive ChangeMay 7, 2026DEF 14ADEF 14AMar 27, 20268-K/AExecutive ChangeMar 18, 202610-K10-KFeb 26, 20268-KResults of OperationsFeb 26, 20268-KExecutive Change · Company UpdateJan 9, 20268-K/AExit / Disposal CostsDec 3, 202510-Q10-QNov 7, 20258-KResults of OperationsNov 7, 20258-KExecutive ChangeNov 5, 202510-Q10-QAug 8, 20258-KResults of OperationsAug 8, 20258-KMaterial Agreement · New Debt / ObligationJun 18, 20258-KExecutive Change · Company UpdateMay 29, 202510-Q10-QMay 9, 20258-KExecutive Change · Results of OperationsMay 9, 2025DEFA14ADEFA14AApr 11, 2025DEF 14ADEF 14AMar 28, 202510-K10-KFeb 27, 20258-KResults of OperationsFeb 27, 20258-KMaterial Agreement · New Debt / ObligationDec 17, 20248-KExecutive ChangeDec 9, 20248-KExit / Disposal CostsDec 5, 202410-Q10-QNov 8, 20248-KResults of Operations · Exit / Disposal CostsNov 8, 202410-Q10-QAug 8, 20248-KResults of OperationsAug 8, 202410-Q10-QMay 3, 20248-KResults of Operations · Bylaw AmendmentMay 3, 20248-K/AExecutive ChangeMay 2, 20248-KMaterial Agreement · New Debt / ObligationApr 15, 2024DEF 14ADEF 14AApr 2, 202410-K10-KFeb 28, 20248-KResults of OperationsFeb 28, 20248-KExecutive ChangeFeb 13, 2024SC 13GSEC SCHEDULE 13GFeb 9, 20248-KExecutive Change · Company UpdateJan 2, 202410-Q10-QNov 3, 20238-KResults of OperationsNov 3, 20238-KMaterial Agreement · New Debt / ObligationOct 12, 20238-KReg FD DisclosureSep 14, 20238-KBylaw AmendmentAug 3, 202310-Q10-QAug 3, 20238-KResults of OperationsAug 3, 202310-Q10-QMay 5, 20238-KResults of Operations · Shareholder VoteMay 5, 20238-K/AExecutive ChangeMay 4, 20238-KMaterial Agreement · New Debt / ObligationApr 11, 2023DEF 14ADEF 14AApr 3, 20238-KExecutive ChangeMar 22, 20238-KCompany UpdateMar 10, 202310-K10-KFeb 27, 20238-KResults of OperationsFeb 27, 2023SC 13GSC 13GJan 20, 20238-KExecutive ChangeDec 13, 202210-Q10-QNov 4, 20228-KResults of OperationsNov 4, 202210-Q10-QAug 4, 20228-KResults of OperationsAug 4, 20228-KMaterial Agreement · Agreement TerminatedJun 21, 202210-Q10-QMay 6, 20228-KResults of Operations · Shareholder VoteMay 6, 2022DEF 14ANOTICE & PROXY STATEMENTApr 4, 202210-K10-KFeb 23, 20228-KResults of Operations · Company UpdateFeb 23, 2022SC 13GSC 13GFeb 14, 20228-KExecutive ChangeDec 3, 202110-Q10-QNov 4, 20218-KResults of OperationsNov 4, 202110-Q10-QAug 6, 20218-KResults of OperationsAug 6, 20218-KExecutive Change · Company UpdateAug 6, 202110-Q10-QMay 7, 20218-KExecutive Change · Results of OperationsMay 7, 2021DEFA14ADEFA14AApr 19, 2021DEFA14ADEFA14AApr 19, 2021
Insider Activity
In the 90 days to Mar 17, 2026: 1 sold $326K.
| Date | Insider | Action | Shares | Price | Value |
|---|---|---|---|---|---|
| Mar 17, 2026 | Ball M LeroyCEO | Sell | 2,489 | $37.91 | $94K |
| Mar 2, 2026 | Ball M LeroyCEO | Sell | 3,763 | $37.02 | $139K |
| Mar 2, 2026 | Ball M LeroyCEO | Sell | 2,184 | $36.53 | $80K |
| Mar 2, 2026 | Ball M LeroyCEO | Sell | 328 | $37.45 | $12K |
Open-market buys & sells (Form 4, transaction codes P/S). Source: SEC structured insider data.
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