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Apr 28, 2025 08:28AM Form SCHEDULE 13G Koppers Holdings Inc. Filed by: PZENA INVESTMENT MANAGEMENT LLC
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Feb 12, 2024 07:51PM Form SC 13G/A Koppers Holdings Inc. Filed by: FULLER & THALER ASSET MANAGEMENT, INC.
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Jan 26, 2023 09:00AM Form SC 13G/A Koppers Holdings Inc. Filed by: BlackRock Inc.
Jan 20, 2023 05:21PM
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Feb 12, 2021 10:57AM Form SC 13G Koppers Holdings Inc. Filed by: SOUTHERNSUN ASSET MANAGEMENT, LLC
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Feb 14, 2020 11:36AM
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Feb 12, 2020 06:03AM Form SC 13G/A Koppers Holdings Inc. Filed by: VANGUARD GROUP INC
Feb 4, 2020 12:20PM
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Jan 31, 2019 02:07PM Form SC 13G/A Koppers Holdings Inc. Filed by: BlackRock Inc.
Jan 31, 2019 11:20AM
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Nov 15, 2018 11:09AM
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Feb 9, 2018 10:09AM Form SC 13G/A Koppers Holdings Inc. Filed by: VANGUARD GROUP INC
Jan 19, 2018 02:32PM

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