Koppers Holdings Inc. (KOP)

CIK 1315257 · operating company. SEC filings, financial statements, 10-K sections, 8-K items and insider trades for Koppers Holdings Inc..

Recent SEC filings

FiledFormAccession number
Oct 30, 2026SCHEDULE 13G0002100119-26-001629
Oct 22, 2026SCHEDULE 13D/A0000921895-26-002844
Oct 19, 2026SCHEDULE 13G/A0001027796-26-000056
Oct 8, 2026SCHEDULE 13G/A0000354204-26-001043
Sep 15, 202640001315257-26-000052
Sep 15, 202640001245155-26-000006
Sep 15, 202640001463649-26-000006
Sep 15, 202640001584601-26-000013
Sep 1, 202640001229771-26-000020
Aug 20, 202640001229771-26-000018
Aug 13, 202640001919175-26-000008
Aug 12, 20261440001959173-26-005936
Aug 12, 202640001450800-26-000006
Aug 11, 202640001776180-26-000008
Aug 11, 202640001315257-26-000050
Aug 11, 20261440001959173-26-005881
Aug 10, 20261440001959173-26-005819
Aug 7, 20261440001959173-26-005788
Aug 6, 202610-Q0001315257-26-000048
Aug 6, 20268-K0001315257-26-000046
Jul 31, 2026SCHEDULE 13G/A0002100119-26-001506
Jun 23, 202640001229771-26-000016
Jun 17, 202640001245155-26-000004
Jun 17, 202640001739998-26-000006
Jun 17, 202640001463649-26-000004