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Form SCHEDULE 13G/A Koppers Holdings Inc. Filed by: DIMENSIONAL FUND ADVISORS LP

Thu, 08 Oct 2026 14:26:00 -0400

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Form 4 Koppers Holdings Inc. For: Sep 14 Filed by: WILKERSON SONJA MICHELLE

Tue, 15 Sep 2026 16:20:00 -0400

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Form 4 Koppers Holdings Inc. For: Sep 14 Filed by: Feng Xudong

Tue, 15 Sep 2026 16:19:00 -0400

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Form 4 Koppers Holdings Inc. For: Sep 14 Filed by: MOTLEY DAVID L

Tue, 15 Sep 2026 16:17:00 -0400

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Form 4 Koppers Holdings Inc. For: Sep 14 Filed by: Sandifer Andrew D

Tue, 15 Sep 2026 16:15:00 -0400

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Form 4 Koppers Holdings Inc. For: Aug 31 Filed by: BALL M LEROY

Tue, 01 Sep 2026 16:23:00 -0400

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Koppers Holdings Inc. to Host Investor Day on September 17, 2026

Mon, 31 Aug 2026 07:55:00 -0400

PITTSBURGH, Aug. 31, 2026 /PRNewswire/ -- Koppers Holdings Inc. (NYSE: KOP), an integrated global provider of treated wood products, wood treatment chemicals and carbon compounds, today announced that it will host an Investor Day beginning at 9 a.m. Eastern Time on Thursday, September 17, 2026, in Atlanta, Georgia.

Koppers Holdings Inc. to Host Investor Day on September 17, 2026

Mon, 31 Aug 2026 07:55:00 -0400

Form 4 Koppers Holdings Inc. For: Aug 19 Filed by: BALL M LEROY

Thu, 20 Aug 2026 16:09:00 -0400

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Form 4 Koppers Holdings Inc. For: Aug 19 Filed by: BALL M LEROY

Thu, 20 Aug 2026 16:09:00 -0400

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Form 4 Koppers Holdings Inc. For: Aug 12 Filed by: Lucas Stephen G

Thu, 13 Aug 2026 17:11:00 -0400

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Form 4 Koppers Holdings Inc. For: Aug 12 Filed by: Lucas Stephen G

Thu, 13 Aug 2026 17:11:00 -0400

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Form 4 Koppers Holdings Inc. For: Aug 11 Filed by: Sullivan James A.

Wed, 12 Aug 2026 18:30:00 -0400

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Form 4 Koppers Holdings Inc. For: Aug 11 Filed by: Sullivan James A.

Wed, 12 Aug 2026 18:30:00 -0400

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Form 144 Koppers Holdings Inc. Filed by: Lucas Stephen G

Wed, 12 Aug 2026 14:25:00 -0400

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Form 144 Koppers Holdings Inc. Filed by: Lucas Stephen G

Wed, 12 Aug 2026 14:25:00 -0400

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Form 4 Koppers Holdings Inc. For: Aug 10 Filed by: Pearce Bradley A

Tue, 11 Aug 2026 16:25:00 -0400

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Form 4 Koppers Holdings Inc. For: Aug 10 Filed by: Pearce Bradley A

Tue, 11 Aug 2026 16:25:00 -0400

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Form 4 Koppers Holdings Inc. For: Aug 07 Filed by: Sullivan James A.

Tue, 11 Aug 2026 16:22:00 -0400

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Form 4 Koppers Holdings Inc. For: Aug 07 Filed by: Sullivan James A.

Tue, 11 Aug 2026 16:22:00 -0400

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Form 144 Koppers Holdings Inc. Filed by: Sullivan James A.

Tue, 11 Aug 2026 13:02:00 -0400

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Form 144 Koppers Holdings Inc. Filed by: Sullivan James A.

Tue, 11 Aug 2026 13:02:00 -0400

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Form 144 Koppers Holdings Inc. Filed by: Pearce Bradley A

Mon, 10 Aug 2026 14:19:00 -0400

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Form 144 Koppers Holdings Inc. Filed by: Pearce Bradley A

Mon, 10 Aug 2026 14:19:00 -0400

si-local-file:///var/storage/secattach/20260810/26897027.html

Koppers Management Meeting with Financial Community in Montreal and Toronto

Mon, 10 Aug 2026 07:55:00 -0400

PITTSBURGH, Aug. 6, 2026 /PRNewswire/ -- Koppers Holdings Inc. (NYSE: KOP) today announced that the company will host meetings with the investment community in Montreal and Toronto on August 11-12, 2026.