Date Filed | Type | Description |
10/12/2023 |
8-K
| Quarterly results |
08/07/2023 |
144
| Form 144 - Report of proposed sale of securities: |
08/03/2023 |
8-K
| Amendments to Articles of Incorporation or Bylaws; Change in Fiscal Year, Financial Statements and Exhibits ... |
08/03/2023 |
10-Q
| Quarterly Report for the period ended June 30, 2023 |
08/03/2023 |
8-K
| Quarterly results |
08/01/2023 |
144
| Form 144 - Report of proposed sale of securities: |
06/06/2023 |
144
| Form 144 - Report of proposed sale of securities: |
05/05/2023 |
10-Q
| Quarterly Report for the period ended March 31, 2023 |
05/05/2023 |
8-K
| Quarterly results |
05/04/2023 |
8-K/A
| Quarterly results |
04/03/2023 |
ARS
| Form ARS - Annual Report to Security Holders: |
04/03/2023 |
DEF 14A
| Form DEF 14A - Other definitive proxy statements: |
03/22/2023 |
8-K
| Appointed a new director |
03/10/2023 |
8-K
| Other Events, Financial Statements and Exhibits Interactive Data |
02/27/2023 |
10-K
| Annual Report for the period ended December 31, 2022 |
02/27/2023 |
8-K
| Results of Operations and Financial Condition, Financial Statements and Exhibits Interactive Data |
02/14/2023 |
SC 13G/A
| FULLER & THALER ASSET MANAGEMENT, INC. reports a 10.6% stake in Koppers Holdings Inc. |
01/20/2023 |
SC 13G
| BlackRock Inc. reports a 16.8% stake in KOPPERS HOLDINGS INC |
01/20/2023 |
5
| Hyde Leslie S (SVP, Chief Sustainability Offi) has filed a Form 5 on Koppers Holdings Inc. |
01/20/2023 |
5
| BALL M LEROY (President and CEO) has filed a Form 5 on Koppers Holdings Inc. |
12/13/2022 |
8-K
| Quarterly results |
11/04/2022 |
10-Q
| Quarterly Report for the period ended September 30, 2022 |
11/04/2022 |
8-K
| Quarterly results |
08/04/2022 |
10-Q
| Quarterly Report for the period ended June 30, 2022 |
08/04/2022 |
8-K
| Quarterly results |
06/21/2022 |
8-K
| Quarterly results |
05/06/2022 |
10-Q
| Quarterly Report for the period ended March 31, 2022 |
05/06/2022 |
8-K
| Quarterly results |
04/04/2022 |
DEF 14A
| Form DEF 14A - Other definitive proxy statements: |
03/02/2022 |
SC 13G/A
| FULLER & THALER ASSET MANAGEMENT, INC. reports a 10.1% stake in Koppers Holdings Inc. |
02/23/2022 |
10-K
| Annual Report for the period ended December 31, 2021 |
02/23/2022 |
8-K
| Quarterly results |
02/14/2022 |
SC 13G
| Rubric Capital Management LP reports a 5.2% stake in Koppers Holdings Inc. |
02/10/2022 |
SC 13G/A
| VANGUARD GROUP INC reports a 11.1% stake in Koppers Holdings Inc. |
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