Form SCHEDULE 13G Koppers Holdings Inc. Filed by: VANGUARD CAPITAL MANAGEMENT LLC Apr 30, 2026 11:17AM
Form SCHEDULE 13G/A Koppers Holdings Inc. Filed by: VANGUARD GROUP INC Mar 27, 2026 10:17AM
Form SCHEDULE 13G/A Koppers Holdings Inc. Filed by: VANGUARD GROUP INC Oct 31, 2025 11:04AM
Form SCHEDULE 13G/A Koppers Holdings Inc. Filed by: VANGUARD GROUP INC Apr 30, 2025 11:24AM
Form SC 13G/A Koppers Holdings Inc. Filed by: VANGUARD GROUP INC Feb 13, 2024 05:13PM


Feb 9, 2023 12:14PM Form SC 13G/A Koppers Holdings Inc. Filed by: VANGUARD GROUP INC
Feb 10, 2022 08:33AM Form SC 13G/A Koppers Holdings Inc. Filed by: VANGUARD GROUP INC
Feb 10, 2021 11:15AM Form SC 13G/A Koppers Holdings Inc. Filed by: VANGUARD GROUP INC
Feb 12, 2020 06:03AM Form SC 13G/A Koppers Holdings Inc. Filed by: VANGUARD GROUP INC
Apr 8, 2019 01:23PM Form SC 13G Koppers Holdings Inc. Filed by: VANGUARD GROUP INC
Jan 10, 2019 04:38PM Form SC 13G/A Koppers Holdings Inc. Filed by: VANGUARD GROUP INC
Feb 9, 2018 10:09AM Form SC 13G/A Koppers Holdings Inc. Filed by: VANGUARD GROUP INC
Feb 10, 2017 09:35AM Form SC 13G/A Koppers Holdings Inc. Filed by: VANGUARD GROUP INC
Feb 10, 2016 07:47AM Form SC 13G/A Koppers Holdings Inc. Filed by: VANGUARD GROUP INC
Feb 10, 2016 07:20AM Form SC 13G/A Koppers Holdings Inc. Filed by: VANGUARD GROUP INC
Feb 25, 2015 02:49PM Trading Radar for 2/26: Herbalife (HLF), 3D Systems (DDD), Allscripts (MDRX), Splunk (SPLK), SeaWorld (SEAS) Report
Feb 10, 2015 01:59PM Form SC 13G/A Koppers Holdings Inc. Filed by: VANGUARD GROUP INC