Koppers Holdings Inc.

KOP ·Basic Materials, Lumber & Wood Production, United States

SEC Filings

Form	Filed	Description
SCHEDULE 13D/A	Oct 22, 2026
SCHEDULE 13G/A	Oct 19, 2026
SCHEDULE 13G/A	Oct 8, 2026
4	Sep 15, 2026	FORM 4
4	Sep 15, 2026	FORM 4
4	Sep 15, 2026	FORM 4
4	Sep 15, 2026	FORM 4
4	Sep 1, 2026	FORM 4
4	Aug 20, 2026	FORM 4
4	Aug 13, 2026	FORM 4
4	Aug 12, 2026	FORM 4
144	Aug 12, 2026
4	Aug 11, 2026	FORM 4
4	Aug 11, 2026	FORM 4
144	Aug 11, 2026
144	Aug 10, 2026
144	Aug 7, 2026
10-Q	Aug 6, 2026	10-Q
8-K	Aug 6, 2026	8-K
SCHEDULE 13G/A	Jul 31, 2026
4	Jun 23, 2026	FORM 4
4	Jun 17, 2026	FORM 4
4	Jun 17, 2026	FORM 4
4	Jun 17, 2026	FORM 4
4	Jun 17, 2026	FORM 4

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