06/18/2025
7:01 AM | Koppers (Filer)
| Form 8-K
Current report pursuant to Section 13 or 15(d) | |
06/16/2025
3:21 PM | Koppers (Issuer)
Washington Kevin (Reporting)
| Form 4
Statement of changes in beneficial ownership of securities | |
05/29/2025
7:00 AM | Koppers (Filer)
| Form 8-K
Current report pursuant to Section 13 or 15(d) | |
05/09/2025
3:16 PM | Koppers (Issuer)
NEUPAVER ALBERT J (Reporting)
| Form 4
Statement of changes in beneficial ownership of securities | |
05/09/2025
3:19 PM | Koppers (Issuer)
Vartanian Nishan J. (Reporting)
| Form 4
Statement of changes in beneficial ownership of securities | |
05/09/2025
3:21 PM | Koppers (Issuer)
MOTLEY DAVID L (Reporting)
| Form 4
Statement of changes in beneficial ownership of securities | |
05/09/2025
11:21 AM | Koppers (Filer)
| Form 10-Q
General form for quarterly reports under Section 13 or 15(d) | |
05/09/2025
7:19 AM | Koppers (Filer)
| Form 8-K
Current report pursuant to Section 13 or 15(d) | |
05/09/2025
6:01 AM | Koppers (Filer)
| Form S-8
Registration statement under Securities Act of 1933 to be offered to employees pursuant to certain plans | |
05/06/2025
4:43 PM | Koppers (Issuer)
TESTONI LOUIS L (Reporting)
| Form 4
Statement of changes in beneficial ownership of securities | |
05/06/2025
4:48 PM | Koppers (Issuer)
Tritch Stephen R (Reporting)
| Form 4
Statement of changes in beneficial ownership of securities | |
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05/06/2025
3:44 PM | Koppers (Issuer)
NEUPAVER ALBERT J (Reporting)
| Form 4
Statement of changes in beneficial ownership of securities | |
05/06/2025
3:47 PM | JENSEN TRACI L (Reporting)
Koppers (Issuer)
| Form 4
Statement of changes in beneficial ownership of securities | |
05/06/2025
3:50 PM | Koppers (Issuer)
Vartanian Nishan J. (Reporting)
| Form 4
Statement of changes in beneficial ownership of securities | |
04/30/2025
10:23 AM | Koppers (Subject)
VANGUARD GROUP INC (Filed by)
| Form SCHEDULE 13G/A | |
04/28/2025
7:28 AM | Koppers (Subject)
PZENA INVESTMENT MANAGEMENT LLC (Filed by)
| Form SCHEDULE 13G | |
04/23/2025
7:57 PM | BlackRock, Inc. (Filed by)
Koppers (Subject)
| Form SCHEDULE 13G/A | |
03/28/2025
3:34 PM | Koppers (Filer)
| Form ARS | |
03/26/2025
4:03 PM | Koppers (Issuer)
Washington Kevin (Reporting)
| Form 4
Statement of changes in beneficial ownership of securities | |
03/26/2025
4:07 PM | Koppers (Issuer)
Vartanian Nishan J. (Reporting)
| Form 4
Statement of changes in beneficial ownership of securities | |
03/26/2025
3:36 PM | Koppers (Issuer)
Sandifer Andrew D (Reporting)
| Form 4
Statement of changes in beneficial ownership of securities | |
03/26/2025
3:39 PM | Koppers (Issuer)
NEUPAVER ALBERT J (Reporting)
| Form 4
Statement of changes in beneficial ownership of securities | |
03/26/2025
3:42 PM | Koppers (Issuer)
MOTLEY DAVID L (Reporting)
| Form 4
Statement of changes in beneficial ownership of securities | |
03/26/2025
3:49 PM | JENSEN TRACI L (Reporting)
Koppers (Issuer)
| Form 4
Statement of changes in beneficial ownership of securities | |
03/26/2025
3:54 PM | Feng Xudong (Reporting)
Koppers (Issuer)
| Form 4
Statement of changes in beneficial ownership of securities | |
03/26/2025
3:21 PM | Koppers (Issuer)
Tritch Stephen R (Reporting)
| Form 4
Statement of changes in beneficial ownership of securities | |
03/26/2025
3:32 PM | Koppers (Issuer)
TESTONI LOUIS L (Reporting)
| Form 4
Statement of changes in beneficial ownership of securities | |
03/19/2025
3:14 PM | BALL M LEROY (Reporting)
Koppers (Subject)
| Form 144
Notice of proposed sale of securities pursuant to Rule 144 | |
03/11/2025
5:39 PM | Koppers (Issuer)
WILKERSON SONJA MICHELLE (Reporting)
| Form 4/A | |
02/27/2025
10:53 AM | Koppers (Filer)
| Form 10-K
Annual report pursuant to Section 13 or 15(d) | |
02/27/2025
7:33 AM | Koppers (Filer)
| Form 8-K
Current report pursuant to Section 13 or 15(d) | |
02/24/2025
3:44 PM | BALL M LEROY (Reporting)
Koppers (Issuer)
| Form 4
Statement of changes in beneficial ownership of securities | |
02/24/2025
3:51 PM | Koppers (Issuer)
Lovalekar Tushar (Reporting)
| Form 3
Initial statement of beneficial ownership of securities | |
01/07/2025
3:03 PM | Apostolou Stephanie L (Reporting)
Koppers (Issuer)
| Form 4
Statement of changes in beneficial ownership of securities | |
01/07/2025
2:57 PM | Koppers (Issuer)
Skrovanek Daniel J (Reporting)
| Form 4
Statement of changes in beneficial ownership of securities | |
01/07/2025
2:58 PM | Koppers (Issuer)
Pearce Bradley A (Reporting)
| Form 4
Statement of changes in beneficial ownership of securities | |
01/07/2025
3:00 PM | Koppers (Issuer)
Lucas Stephen G (Reporting)
| Form 4
Statement of changes in beneficial ownership of securities | |
01/07/2025
2:51 PM | Koppers (Issuer)
Washington Kevin (Reporting)
| Form 4
Statement of changes in beneficial ownership of securities | |
01/07/2025
2:52 PM | Koppers (Issuer)
Sullivan James A. (Reporting)
| Form 4
Statement of changes in beneficial ownership of securities | |
01/07/2025
2:54 PM | Koppers (Issuer)
Smith Jimmi Sue (Reporting)
| Form 4
Statement of changes in beneficial ownership of securities | |
12/18/2024
3:36 PM | Koppers (Issuer)
Skrovanek Daniel J (Reporting)
| Form 4
Statement of changes in beneficial ownership of securities | |
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12/18/2024
3:41 PM | Koppers (Issuer)
Smith Jimmi Sue (Reporting)
| Form 4
Statement of changes in beneficial ownership of securities | |
12/18/2024
3:44 PM | Koppers (Issuer)
Sullivan James A. (Reporting)
| Form 4
Statement of changes in beneficial ownership of securities | |
12/18/2024
3:47 PM | Koppers (Issuer)
Washington Kevin (Reporting)
| Form 4
Statement of changes in beneficial ownership of securities | |
12/18/2024
3:22 PM | Koppers (Issuer)
Pearce Bradley A (Reporting)
| Form 4
Statement of changes in beneficial ownership of securities | |
12/18/2024
3:27 PM | Apostolou Stephanie L (Reporting)
Koppers (Issuer)
| Form 4
Statement of changes in beneficial ownership of securities | |
12/18/2024
3:30 PM | BALL M LEROY (Reporting)
Koppers (Issuer)
| Form 4
Statement of changes in beneficial ownership of securities | |
12/18/2024
3:33 PM | Koppers (Issuer)
Lucas Stephen G (Reporting)
| Form 4
Statement of changes in beneficial ownership of securities | |
12/17/2024
4:22 PM | Koppers (Issuer)
WILKERSON SONJA MICHELLE (Reporting)
| Form 4
Statement of changes in beneficial ownership of securities | |
12/17/2024
4:25 PM | Koppers (Issuer)
MOTLEY DAVID L (Reporting)
| Form 4
Statement of changes in beneficial ownership of securities | |
12/17/2024
4:27 PM | Feng Xudong (Reporting)
Koppers (Issuer)
| Form 4
Statement of changes in beneficial ownership of securities | |
12/17/2024
3:31 PM | Koppers (Filer)
| Form 8-K
Current report pursuant to Section 13 or 15(d) | |
12/09/2024
6:58 AM | Koppers (Filer)
| Form 8-K
Current report pursuant to Section 13 or 15(d) | |
12/05/2024
3:45 PM | Koppers (Filer)
| Form 8-K
Current report pursuant to Section 13 or 15(d) | |
11/22/2024
10:22 AM | Koppers (Subject)
Tritch Stephen R (Reporting)
| Form 144
Notice of proposed sale of securities pursuant to Rule 144 | |
11/20/2024
3:17 PM | BALL M LEROY (Reporting)
Koppers (Issuer)
| Form 4
Statement of changes in beneficial ownership of securities | |
11/20/2024
3:23 PM | Koppers (Issuer)
Tritch Stephen R (Reporting)
| Form 4
Statement of changes in beneficial ownership of securities | |
11/15/2024
3:19 PM | BALL M LEROY (Reporting)
Koppers (Subject)
| Form 144
Notice of proposed sale of securities pursuant to Rule 144 | |
11/14/2024
3:57 PM | BALL M LEROY (Reporting)
Koppers (Issuer)
| Form 4
Statement of changes in beneficial ownership of securities | |
11/14/2024
9:31 AM | BALL M LEROY (Reporting)
Koppers (Subject)
| Form 144
Notice of proposed sale of securities pursuant to Rule 144 | |
11/13/2024
3:32 PM | BALL M LEROY (Reporting)
Koppers (Subject)
| Form 144
Notice of proposed sale of securities pursuant to Rule 144 | |
11/12/2024
11:45 AM | Koppers (Subject)
Pearce Bradley A (Reporting)
| Form 144
Notice of proposed sale of securities pursuant to Rule 144 | |
11/08/2024
10:59 AM | Koppers (Filer)
| Form 10-Q
General form for quarterly reports under Section 13 or 15(d) | |
11/08/2024
7:24 AM | Koppers (Filer)
| Form 8-K
Current report pursuant to Section 13 or 15(d) | |
10/18/2024
2:31 PM | BlackRock, Inc. (Filed by)
Koppers (Subject)
| Form SC 13G/A | |
10/07/2024
4:38 PM | FULLER & THALER ASSET MANAGEMENT, INC. (Filed by)
Koppers (Subject)
| Form SC 13G/A | |
09/18/2024
4:19 PM | Koppers (Issuer)
MOTLEY DAVID L (Reporting)
| Form 4
Statement of changes in beneficial ownership of securities | |
09/18/2024
4:13 PM | Koppers (Issuer)
WILKERSON SONJA MICHELLE (Reporting)
| Form 4
Statement of changes in beneficial ownership of securities | |
09/18/2024
4:16 PM | Feng Xudong (Reporting)
Koppers (Issuer)
| Form 4
Statement of changes in beneficial ownership of securities | |
08/30/2024
3:01 PM | BALL M LEROY (Reporting)
Koppers (Issuer)
| Form 4
Statement of changes in beneficial ownership of securities | |
08/29/2024
2:12 PM | BALL M LEROY (Reporting)
Koppers (Subject)
| Form 144
Notice of proposed sale of securities pursuant to Rule 144 | |
08/27/2024
3:06 PM | BALL M LEROY (Reporting)
Koppers (Subject)
| Form 144
Notice of proposed sale of securities pursuant to Rule 144 | |
08/20/2024
4:02 PM | Dowd Joseph P (Reporting)
Koppers (Issuer)
| Form 4
Statement of changes in beneficial ownership of securities | |
08/19/2024
11:40 AM | Dowd Joseph P (Reporting)
Koppers (Subject)
| Form 144
Notice of proposed sale of securities pursuant to Rule 144 | |
08/08/2024
11:16 AM | Koppers (Filer)
| Form 10-Q
General form for quarterly reports under Section 13 or 15(d) | |
08/08/2024
7:24 AM | Koppers (Filer)
| Form 8-K
Current report pursuant to Section 13 or 15(d) | |
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