30 results
8-K
EX-99.1
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3 Nov 23
Koppers Reports Third Quarter 2023 Results; Reaffirms 2023 Outlook
8:21am
8-K
EX-10.3
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13 Dec 22
Departure of Directors or Certain Officers
4:31pm
8-K
EX-10.2
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13 Dec 22
Departure of Directors or Certain Officers
4:31pm
8-K
EX-10.1
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13 Dec 22
Departure of Directors or Certain Officers
4:31pm
S-8
EX-99.1
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6 May 20
Registration of securities for employees
4:31pm
424B3
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27 Feb 20
Prospectus supplement
7:42am