Koppers Holdings Inc. SEC EDGAR Filings (CIK 0001315257)

SEC EDGAR filings, ownership reports, and insider transactions for Koppers Holdings Inc..

Symbol
KOP on NYSE
Industry
Lumber & Wood Products (No Furniture) (Office Of Manufacturing)
Business address
436 Seventh Avenue, Pittsburgh, PA, 15219
State of incorporation
PA
Fiscal year end
31 December
Former names
KI Holdings Inc. (to 14 Nov 2005)
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Koppers Holdings Inc. has filed 1,958 SEC EDGAR filings since 14 Feb 2005

Latest Filings

Recent SEC filings for Koppers Holdings Inc. including 10-K, 8-K, 4 and more.

Form type Document Filing Description Filing date Reporting date File number(s)
10-K Open 10-K document | Open XBRL data View SEC filing for 10-K 10-K 26 Feb 2026 31 Dec 2025 001-32737
8-K Open 8-K document | Open XBRL data View SEC filing for 8-K 8-K 26 Feb 2026 26 Feb 2026 001-32737
4 Open 4 document View SEC filing for 4 FORM 4 19 Feb 2026 18 Feb 2026
4 Open 4 document View SEC filing for 4 FORM 4 12 Feb 2026 10 Feb 2026
8-K Open 8-K document | Open XBRL data View SEC filing for 8-K 8-K 09 Jan 2026 05 Jan 2026 001-32737
4 Open 4 document View SEC filing for 4 FORM 4 06 Jan 2026 02 Jan 2026
4 Open 4 document View SEC filing for 4 FORM 4 06 Jan 2026 02 Jan 2026
4 Open 4 document View SEC filing for 4 FORM 4 06 Jan 2026 02 Jan 2026
4 Open 4 document View SEC filing for 4 FORM 4 06 Jan 2026 02 Jan 2026
4 Open 4 document View SEC filing for 4 FORM 4 06 Jan 2026 02 Jan 2026
4 Open 4 document View SEC filing for 4 FORM 4 06 Jan 2026 02 Jan 2026
4 Open 4 document View SEC filing for 4 FORM 4 06 Jan 2026 02 Jan 2026
4 Open 4 document View SEC filing for 4 FORM 4 17 Dec 2025 16 Dec 2025
4 Open 4 document View SEC filing for 4 FORM 4 17 Dec 2025 16 Dec 2025
4 Open 4 document View SEC filing for 4 FORM 4 17 Dec 2025 16 Dec 2025
4 Open 4 document View SEC filing for 4 FORM 4 17 Dec 2025 16 Dec 2025
4 Open 4 document View SEC filing for 4 FORM 4 17 Dec 2025 16 Dec 2025
4 Open 4 document View SEC filing for 4 FORM 4 17 Dec 2025 16 Dec 2025
4 Open 4 document View SEC filing for 4 FORM 4 17 Dec 2025 16 Dec 2025
4 Open 4 document View SEC filing for 4 FORM 4 17 Dec 2025 16 Dec 2025
4 Open 4 document View SEC filing for 4 FORM 4 17 Dec 2025 16 Dec 2025
4 Open 4 document View SEC filing for 4 FORM 4 17 Dec 2025 16 Dec 2025
4 Open 4 document View SEC filing for 4 FORM 4 17 Dec 2025 16 Dec 2025
8-K/A Open 8-K/A document | Open XBRL data View SEC filing for 8-K/A 8-K 03 Dec 2025 08 Nov 2024 001-32737
4 Open 4 document View SEC filing for 4 FORM 4 07 Nov 2025 05 Nov 2025
3 Open 3 document View SEC filing for 3 FORM 3 07 Nov 2025 05 Nov 2025
10-Q Open 10-Q document | Open XBRL data View SEC filing for 10-Q 10-Q 07 Nov 2025 30 Sep 2025 001-32737
8-K Open 8-K document | Open XBRL data View SEC filing for 8-K 8-K 07 Nov 2025 07 Nov 2025 001-32737
8-K Open 8-K document | Open XBRL data View SEC filing for 8-K 8-K 05 Nov 2025 05 Nov 2025 001-32737
SCHEDULE 13G/A Open SCHEDULE 13G/A document View SEC filing for SCHEDULE 13G/A 31 Oct 2025 005-81507
4 Open 4 document View SEC filing for 4 FORM 4 17 Sep 2025 15 Sep 2025
4 Open 4 document View SEC filing for 4 FORM 4 17 Sep 2025 15 Sep 2025
4 Open 4 document View SEC filing for 4 FORM 4 17 Sep 2025 15 Sep 2025
4 Open 4 document View SEC filing for 4 FORM 4 17 Sep 2025 15 Sep 2025
4 Open 4 document View SEC filing for 4 4 18 Aug 2025 15 Aug 2025
144 Open 144 document View SEC filing for 144 15 Aug 2025 001-32737
144 Open 144 document View SEC filing for 144 11 Aug 2025 001-32737
10-Q Open 10-Q document | Open XBRL data View SEC filing for 10-Q 10-Q 08 Aug 2025 30 Jun 2025 001-32737
8-K Open 8-K document | Open XBRL data View SEC filing for 8-K 8-K 08 Aug 2025 08 Aug 2025 001-32737
4 Open 4 document View SEC filing for 4 4 20 Jun 2025 18 Jun 2025
8-K Open 8-K document | Open XBRL data View SEC filing for 8-K 8-K 18 Jun 2025 17 Jun 2025 001-32737
4 Open 4 document View SEC filing for 4 4 16 Jun 2025 13 Jun 2025
8-K Open 8-K document | Open XBRL data View SEC filing for 8-K 8-K 29 May 2025 22 May 2025 001-32737
4 Open 4 document View SEC filing for 4 4 22 May 2025 21 May 2025
4 Open 4 document View SEC filing for 4 4 09 May 2025 08 May 2025
4 Open 4 document View SEC filing for 4 4 09 May 2025 08 May 2025
4 Open 4 document View SEC filing for 4 4 09 May 2025 08 May 2025
4 Open 4 document View SEC filing for 4 4 09 May 2025 08 May 2025
4 Open 4 document View SEC filing for 4 4 09 May 2025 08 May 2025
4 Open 4 document View SEC filing for 4 4 09 May 2025 08 May 2025
4 Open 4 document View SEC filing for 4 4 09 May 2025 08 May 2025
10-Q Open 10-Q document | Open XBRL data View SEC filing for 10-Q 10-Q 09 May 2025 31 Mar 2025 001-32737
8-K Open 8-K document | Open XBRL data View SEC filing for 8-K 8-K 09 May 2025 08 May 2025 001-32737
S-8 Open S-8 document | Open XBRL data View SEC filing for S-8 S-8 09 May 2025 333-287117
4 Open 4 document View SEC filing for 4 4 06 May 2025 02 May 2025
4 Open 4 document View SEC filing for 4 4 06 May 2025 02 May 2025
4 Open 4 document View SEC filing for 4 4 06 May 2025 02 May 2025
4 Open 4 document View SEC filing for 4 4 06 May 2025 02 May 2025
4 Open 4 document View SEC filing for 4 4 06 May 2025 02 May 2025
SCHEDULE 13G/A Open SCHEDULE 13G/A document View SEC filing for SCHEDULE 13G/A 30 Apr 2025 005-81507
SCHEDULE 13G Open SCHEDULE 13G document View SEC filing for SCHEDULE 13G 28 Apr 2025 005-81507
SCHEDULE 13G/A Open SCHEDULE 13G/A document View SEC filing for SCHEDULE 13G/A 23 Apr 2025 005-81507
4 Open 4 document View SEC filing for 4 4 14 Apr 2025 11 Apr 2025
DEFA14A Open DEFA14A document View SEC filing for DEFA14A DEFA14A 11 Apr 2025 001-32737
ARS Open ARS document View SEC filing for ARS ARS 28 Mar 2025 31 Dec 2024 001-32737
DEF 14A Open DEF 14A document | Open XBRL data View SEC filing for DEF 14A DEF 14A 28 Mar 2025 08 May 2025 001-32737
4 Open 4 document View SEC filing for 4 4 26 Mar 2025 24 Mar 2025
4 Open 4 document View SEC filing for 4 4 26 Mar 2025 24 Mar 2025
4 Open 4 document View SEC filing for 4 4 26 Mar 2025 24 Mar 2025
4 Open 4 document View SEC filing for 4 4 26 Mar 2025 24 Mar 2025
4 Open 4 document View SEC filing for 4 4 26 Mar 2025 24 Mar 2025
4 Open 4 document View SEC filing for 4 4 26 Mar 2025 24 Mar 2025
4 Open 4 document View SEC filing for 4 4 26 Mar 2025 24 Mar 2025
4 Open 4 document View SEC filing for 4 4 26 Mar 2025 24 Mar 2025
4 Open 4 document View SEC filing for 4 4 26 Mar 2025 24 Mar 2025
4 Open 4 document View SEC filing for 4 4 26 Mar 2025 24 Mar 2025
4 Open 4 document View SEC filing for 4 4 26 Mar 2025 24 Mar 2025
4 Open 4 document View SEC filing for 4 4 20 Mar 2025 19 Mar 2025
144 Open 144 document View SEC filing for 144 19 Mar 2025 001-32737
4/A Open 4/A document View SEC filing for 4/A 4/A 11 Mar 2025 04 May 2023
10-K Open 10-K document | Open XBRL data View SEC filing for 10-K 10-K 27 Feb 2025 31 Dec 2024 001-32737
8-K Open 8-K document | Open XBRL data View SEC filing for 8-K 8-K 27 Feb 2025 27 Feb 2025 001-32737
3 Open 3 document View SEC filing for 3 3 24 Feb 2025 12 Feb 2025
4 Open 4 document View SEC filing for 4 4 24 Feb 2025 20 Feb 2025
SCHEDULE 13G/A Open SCHEDULE 13G/A document View SEC filing for SCHEDULE 13G/A 05 Feb 2025 005-81507
4 Open 4 document View SEC filing for 4 4 07 Jan 2025 03 Jan 2025
4 Open 4 document View SEC filing for 4 4 07 Jan 2025 03 Jan 2025
4 Open 4 document View SEC filing for 4 4 07 Jan 2025 03 Jan 2025
4 Open 4 document View SEC filing for 4 4 07 Jan 2025 03 Jan 2025
4 Open 4 document View SEC filing for 4 4 07 Jan 2025 03 Jan 2025
4 Open 4 document View SEC filing for 4 4 07 Jan 2025 03 Jan 2025
4 Open 4 document View SEC filing for 4 4 07 Jan 2025 03 Jan 2025
4 Open 4 document View SEC filing for 4 4 07 Jan 2025 03 Jan 2025
4 Open 4 document View SEC filing for 4 4 18 Dec 2024 16 Dec 2024
4 Open 4 document View SEC filing for 4 4 18 Dec 2024 16 Dec 2024
4 Open 4 document View SEC filing for 4 4 18 Dec 2024 16 Dec 2024
4 Open 4 document View SEC filing for 4 4 18 Dec 2024 16 Dec 2024
4 Open 4 document View SEC filing for 4 4 18 Dec 2024 16 Dec 2024
4 Open 4 document View SEC filing for 4 4 18 Dec 2024 16 Dec 2024
4 Open 4 document View SEC filing for 4 4 18 Dec 2024 16 Dec 2024
4 Open 4 document View SEC filing for 4 4 18 Dec 2024 16 Dec 2024
4 Open 4 document View SEC filing for 4 4 17 Dec 2024 16 Dec 2024
4 Open 4 document View SEC filing for 4 4 17 Dec 2024 16 Dec 2024
4 Open 4 document View SEC filing for 4 4 17 Dec 2024 16 Dec 2024
8-K Open 8-K document | Open XBRL data View SEC filing for 8-K 8-K 17 Dec 2024 17 Dec 2024 001-32737
8-K Open 8-K document | Open XBRL data View SEC filing for 8-K 8-K 09 Dec 2024 05 Dec 2024 001-32737
8-K Open 8-K document | Open XBRL data View SEC filing for 8-K 8-K 05 Dec 2024 05 Dec 2024 001-32737
144 Open 144 document View SEC filing for 144 22 Nov 2024 001-32737
4 Open 4 document View SEC filing for 4 4 20 Nov 2024 19 Nov 2024
4 Open 4 document View SEC filing for 4 4 20 Nov 2024 19 Nov 2024
144 Open 144 document View SEC filing for 144 19 Nov 2024 001-32737
4 Open 4 document View SEC filing for 4 4 18 Nov 2024 14 Nov 2024
144 Open 144 document View SEC filing for 144 15 Nov 2024 001-32737
4 Open 4 document View SEC filing for 4 4 14 Nov 2024 12 Nov 2024
144 Open 144 document View SEC filing for 144 14 Nov 2024 001-32737
144 Open 144 document View SEC filing for 144 13 Nov 2024 001-32737
4 Open 4 document View SEC filing for 4 4 13 Nov 2024 12 Nov 2024
144 Open 144 document View SEC filing for 144 12 Nov 2024 001-32737
144 Open 144 document View SEC filing for 144 12 Nov 2024 001-32737
SC 13G/A Open SC 13G/A document View SEC filing for SC 13G/A 08 Nov 2024 005-81507
10-Q Open 10-Q document | Open XBRL data View SEC filing for 10-Q 10-Q 08 Nov 2024 30 Sep 2024 001-32737
8-K Open 8-K document | Open XBRL data View SEC filing for 8-K 8-K 08 Nov 2024 08 Nov 2024 001-32737
SC 13G/A Open SC 13G/A document View SEC filing for SC 13G/A 18 Oct 2024 005-81507
SC 13G/A Open SC 13G/A document View SEC filing for SC 13G/A 07 Oct 2024 005-81507
4 Open 4 document View SEC filing for 4 4 18 Sep 2024 16 Sep 2024
4 Open 4 document View SEC filing for 4 4 18 Sep 2024 16 Sep 2024
4 Open 4 document View SEC filing for 4 4 18 Sep 2024 16 Sep 2024
4 Open 4 document View SEC filing for 4 4 30 Aug 2024 29 Aug 2024
144 Open 144 document View SEC filing for 144 29 Aug 2024 001-32737
4 Open 4 document View SEC filing for 4 4 28 Aug 2024 27 Aug 2024
144 Open 144 document View SEC filing for 144 27 Aug 2024 001-32737
4 Open 4 document View SEC filing for 4 4 20 Aug 2024 19 Aug 2024
144 Open 144 document View SEC filing for 144 19 Aug 2024 001-32737
10-Q Open 10-Q document | Open XBRL data View SEC filing for 10-Q 10-Q 08 Aug 2024 30 Jun 2024 001-32737
8-K Open 8-K document | Open XBRL data View SEC filing for 8-K 8-K 08 Aug 2024 08 Aug 2024 001-32737
4 Open 4 document View SEC filing for 4 4 20 Jun 2024 20 Jun 2024
4 Open 4 document View SEC filing for 4 4 14 Jun 2024 13 Jun 2024
4 Open 4 document View SEC filing for 4 4 12 Jun 2024 10 Jun 2024
4 Open 4 document View SEC filing for 4 4 12 Jun 2024 10 Jun 2024
4 Open 4 document View SEC filing for 4 4 12 Jun 2024 10 Jun 2024
4 Open 4 document View SEC filing for 4 4 12 Jun 2024 10 Jun 2024
4 Open 4 document View SEC filing for 4 4 10 Jun 2024 06 Jun 2024
144 Open 144 document View SEC filing for 144 07 Jun 2024 001-32737
144 Open 144 document View SEC filing for 144 06 Jun 2024 001-32737
4 Open 4 document View SEC filing for 4 4 29 May 2024 24 May 2024
144 Open 144 document View SEC filing for 144 28 May 2024 001-32737
144 Open 144 document View SEC filing for 144 24 May 2024 001-32737
4 Open 4 document View SEC filing for 4 4 17 May 2024 17 May 2024
144 Open 144 document View SEC filing for 144 17 May 2024 001-32737
4 Open 4 document View SEC filing for 4 4 06 May 2024 02 May 2024
4 Open 4 document View SEC filing for 4 4 06 May 2024 02 May 2024
4 Open 4 document View SEC filing for 4 4 06 May 2024 02 May 2024
4 Open 4 document View SEC filing for 4 4 06 May 2024 02 May 2024
4 Open 4 document View SEC filing for 4 4 06 May 2024 02 May 2024
4 Open 4 document View SEC filing for 4 4 06 May 2024 02 May 2024
4 Open 4 document View SEC filing for 4 4 06 May 2024 02 May 2024
4 Open 4 document View SEC filing for 4 4 06 May 2024 02 May 2024
4 Open 4 document View SEC filing for 4 4 06 May 2024 02 May 2024
10-Q Open 10-Q document | Open XBRL data View SEC filing for 10-Q 10-Q 03 May 2024 31 Mar 2024 001-32737
8-K Open 8-K document | Open XBRL data View SEC filing for 8-K 8-K 03 May 2024 02 May 2024 001-32737
8-K/A Open 8-K/A document | Open XBRL data View SEC filing for 8-K/A 8-K/A 02 May 2024 02 May 2024 001-32737
4 Open 4 document View SEC filing for 4 4 15 Apr 2024 11 Apr 2024
8-K Open 8-K document | Open XBRL data View SEC filing for 8-K 8-K 15 Apr 2024 12 Apr 2024 001-32737
ARS Open ARS document View SEC filing for ARS ARS 02 Apr 2024 31 Dec 2023 001-32737
DEF 14A Open DEF 14A document | Open XBRL data View SEC filing for DEF 14A DEF 14A 02 Apr 2024 02 May 2024 001-32737
4 Open 4 document View SEC filing for 4 4 27 Mar 2024 25 Mar 2024
4 Open 4 document View SEC filing for 4 4 27 Mar 2024 25 Mar 2024
4 Open 4 document View SEC filing for 4 4 27 Mar 2024 25 Mar 2024
4 Open 4 document View SEC filing for 4 4 27 Mar 2024 25 Mar 2024
4 Open 4 document View SEC filing for 4 4 27 Mar 2024 25 Mar 2024
4 Open 4 document View SEC filing for 4 4 27 Mar 2024 25 Mar 2024
4 Open 4 document View SEC filing for 4 4 27 Mar 2024 25 Mar 2024
4 Open 4 document View SEC filing for 4 4 27 Mar 2024 25 Mar 2024
4 Open 4 document View SEC filing for 4 4 27 Mar 2024 25 Mar 2024
4 Open 4 document View SEC filing for 4 4 22 Mar 2024 21 Mar 2024
144 Open 144 document View SEC filing for 144 21 Mar 2024 001-32737
PRE 14A Open PRE 14A document | Open XBRL data View SEC filing for PRE 14A PRE 14A 08 Mar 2024 02 May 2024 001-32737
4 Open 4 document View SEC filing for 4 4 07 Mar 2024 06 Mar 2024
4 Open 4 document View SEC filing for 4 4 07 Mar 2024 06 Mar 2024
4 Open 4 document View SEC filing for 4 4 07 Mar 2024 05 Mar 2024
4 Open 4 document View SEC filing for 4 4 07 Mar 2024 06 Mar 2024
4 Open 4 document View SEC filing for 4 4 06 Mar 2024 04 Mar 2024
4 Open 4 document View SEC filing for 4 4 06 Mar 2024 04 Mar 2024
4 Open 4 document View SEC filing for 4 4 06 Mar 2024 04 Mar 2024
144 Open 144 document View SEC filing for 144 06 Mar 2024 001-32737
144/A Open 144/A document View SEC filing for 144/A 06 Mar 2024 001-32737
144 Open 144 document View SEC filing for 144 06 Mar 2024 001-32737
144 Open 144 document View SEC filing for 144 06 Mar 2024 001-32737
4 Open 4 document View SEC filing for 4 4 05 Mar 2024 01 Mar 2024
4 Open 4 document View SEC filing for 4 4 05 Mar 2024 01 Mar 2024
4 Open 4 document View SEC filing for 4 4 05 Mar 2024 01 Mar 2024
4 Open 4 document View SEC filing for 4 4 05 Mar 2024 01 Mar 2024
4 Open 4 document View SEC filing for 4 4 05 Mar 2024 01 Mar 2024
4 Open 4 document View SEC filing for 4 4 05 Mar 2024 01 Mar 2024
4 Open 4 document View SEC filing for 4 4 05 Mar 2024 01 Mar 2024
4 Open 4 document View SEC filing for 4 4 05 Mar 2024 01 Mar 2024
144 Open 144 document View SEC filing for 144 05 Mar 2024 001-32737
144 Open 144 document View SEC filing for 144 05 Mar 2024 001-32737
144 Open 144 document View SEC filing for 144 05 Mar 2024 001-32737
144 Open 144 document View SEC filing for 144 04 Mar 2024 001-32737
144 Open 144 document View SEC filing for 144 04 Mar 2024 001-32737
144 Open 144 document View SEC filing for 144 04 Mar 2024 001-32737
144 Open 144 document View SEC filing for 144 01 Mar 2024 001-32737
144 Open 144 document View SEC filing for 144 01 Mar 2024 001-32737
144 Open 144 document View SEC filing for 144 01 Mar 2024 001-32737
10-K Open 10-K document | Open XBRL data View SEC filing for 10-K 10-K 28 Feb 2024 31 Dec 2023 001-32737
8-K Open 8-K document | Open XBRL data View SEC filing for 8-K 8-K 28 Feb 2024 28 Feb 2024 001-32737
4 Open 4 document View SEC filing for 4 4 15 Feb 2024 14 Feb 2024
3 Open 3 document View SEC filing for 3 3 14 Feb 2024 13 Feb 2024
SC 13G/A Open SC 13G/A document View SEC filing for SC 13G/A SCHEDULE 13G/A 13 Feb 2024 005-81507
8-K Open 8-K document | Open XBRL data View SEC filing for 8-K 8-K 13 Feb 2024 13 Feb 2024 001-32737
SC 13G/A Open SC 13G/A document View SEC filing for SC 13G/A 12 Feb 2024 005-81507
SC 13G/A Open SC 13G/A document View SEC filing for SC 13G/A SC 13G/A 12 Feb 2024 005-81507
SC 13G Open SC 13G document View SEC filing for SC 13G SEC SCHEDULE 13G 09 Feb 2024 005-81507
SC 13G/A Open SC 13G/A document View SEC filing for SC 13G/A 22 Jan 2024 005-81507
4 Open 4 document View SEC filing for 4 4 08 Jan 2024 04 Jan 2024
4 Open 4 document View SEC filing for 4 4 08 Jan 2024 04 Jan 2024
4 Open 4 document View SEC filing for 4 4 08 Jan 2024 04 Jan 2024
4 Open 4 document View SEC filing for 4 4 08 Jan 2024 04 Jan 2024
4 Open 4 document View SEC filing for 4 4 08 Jan 2024 04 Jan 2024
4 Open 4 document View SEC filing for 4 4 08 Jan 2024 04 Jan 2024
4 Open 4 document View SEC filing for 4 4 08 Jan 2024 04 Jan 2024
4 Open 4 document View SEC filing for 4 4 08 Jan 2024 04 Jan 2024
4 Open 4 document View SEC filing for 4 4 08 Jan 2024 04 Jan 2024
4 Open 4 document View SEC filing for 4 4 08 Jan 2024 04 Jan 2024
8-K Open 8-K document | Open XBRL data View SEC filing for 8-K 8-K 02 Jan 2024 01 Jan 2024 001-32737
4 Open 4 document View SEC filing for 4 4 21 Dec 2023 20 Dec 2023
4 Open 4 document View SEC filing for 4 4 20 Dec 2023 20 Dec 2023
144 Open 144 document View SEC filing for 144 20 Dec 2023 001-32737
144 Open 144 document View SEC filing for 144 20 Dec 2023 001-32737
4 Open 4 document View SEC filing for 4 4 15 Dec 2023 14 Dec 2023
4 Open 4 document View SEC filing for 4 4 15 Dec 2023 14 Dec 2023
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4 Open 4 document View SEC filing for 4 4 14 Dec 2023 12 Dec 2023
4 Open 4 document View SEC filing for 4 4 14 Dec 2023 12 Dec 2023
4 Open 4 document View SEC filing for 4 4 14 Dec 2023 12 Dec 2023
4 Open 4 document View SEC filing for 4 4 14 Dec 2023 12 Dec 2023
4 Open 4 document View SEC filing for 4 4 14 Dec 2023 12 Dec 2023
4 Open 4 document View SEC filing for 4 4 14 Dec 2023 12 Dec 2023
4 Open 4 document View SEC filing for 4 4 14 Dec 2023 12 Dec 2023
144 Open 144 document View SEC filing for 144 14 Dec 2023 001-32737
144 Open 144 document View SEC filing for 144 14 Dec 2023 001-32737
144 Open 144 document View SEC filing for 144 13 Dec 2023 001-32737
4 Open 4 document View SEC filing for 4 4 12 Dec 2023 08 Dec 2023
144 Open 144 document View SEC filing for 144 12 Dec 2023 001-32737
144 Open 144 document View SEC filing for 144 11 Dec 2023 001-32737
4 Open 4 document View SEC filing for 4 4 08 Dec 2023 06 Dec 2023
144 Open 144 document View SEC filing for 144 08 Dec 2023 001-32737
144 Open 144 document View SEC filing for 144 07 Dec 2023 001-32737
4 Open 4 document View SEC filing for 4 4 06 Dec 2023 05 Dec 2023
144 Open 144 document View SEC filing for 144 06 Dec 2023 001-32737
144 Open 144 document View SEC filing for 144 05 Dec 2023 001-32737
4 Open 4 document View SEC filing for 4 4 04 Dec 2023 01 Dec 2023
4 Open 4 document View SEC filing for 4 4 01 Dec 2023 29 Nov 2023
144 Open 144 document View SEC filing for 144 01 Dec 2023 001-32737
144 Open 144 document View SEC filing for 144 30 Nov 2023 001-32737
144 Open 144 document View SEC filing for 144 29 Nov 2023 001-32737
4 Open 4 document View SEC filing for 4 4 20 Nov 2023 17 Nov 2023
144 Open 144 document View SEC filing for 144 17 Nov 2023 001-32737
4 Open 4 document View SEC filing for 4 4 16 Nov 2023 14 Nov 2023
144 Open 144 document View SEC filing for 144 15 Nov 2023 001-32737
4 Open 4 document View SEC filing for 4 4 14 Nov 2023 14 Nov 2023
144 Open 144 document View SEC filing for 144 14 Nov 2023 001-32737
10-Q Open 10-Q document | Open XBRL data View SEC filing for 10-Q 10-Q 03 Nov 2023 30 Sep 2023 001-32737
8-K Open 8-K document | Open XBRL data View SEC filing for 8-K 8-K 03 Nov 2023 03 Nov 2023 001-32737
8-K Open 8-K document | Open XBRL data View SEC filing for 8-K 8-K 12 Oct 2023 11 Oct 2023 001-32737
4 Open 4 document View SEC filing for 4 FORM 4 SUBMISSION 19 Sep 2023 18 Sep 2023
144 Open 144 document View SEC filing for 144 18 Sep 2023 001-32737
8-K Open 8-K document | Open XBRL data View SEC filing for 8-K 8-K 14 Sep 2023 14 Sep 2023 001-32737
4 Open 4 document View SEC filing for 4 FORM 4 SUBMISSION 13 Sep 2023 11 Sep 2023
4 Open 4 document View SEC filing for 4 FORM 4 SUBMISSION 13 Sep 2023 11 Sep 2023
4 Open 4 document View SEC filing for 4 FORM 4 SUBMISSION 13 Sep 2023 11 Sep 2023
4 Open 4 document View SEC filing for 4 FORM 4 SUBMISSION 06 Sep 2023 05 Sep 2023
4 Open 4 document View SEC filing for 4 FORM 4 SUBMISSION 05 Sep 2023 01 Sep 2023
144 Open 144 document View SEC filing for 144 01 Sep 2023 001-32737
4 Open 4 document View SEC filing for 4 FORM 4 SUBMISSION 31 Aug 2023 30 Aug 2023
4 Open 4 document View SEC filing for 4 FORM 4 SUBMISSION 09 Aug 2023 07 Aug 2023
144 Open 144 document View SEC filing for 144 07 Aug 2023 001-32737
4 Open 4 document View SEC filing for 4 FORM 4 SUBMISSION 03 Aug 2023 01 Aug 2023
8-K Open 8-K document | Open XBRL data View SEC filing for 8-K 8-K 03 Aug 2023 02 Aug 2023 001-32737
10-Q Open 10-Q document | Open XBRL data View SEC filing for 10-Q 10-Q 03 Aug 2023 30 Jun 2023 001-32737
8-K Open 8-K document | Open XBRL data View SEC filing for 8-K 8-K 03 Aug 2023 03 Aug 2023 001-32737
144 Open 144 document View SEC filing for 144 01 Aug 2023 001-32737
4 Open 4 document View SEC filing for 4 FORM 4 SUBMISSION 14 Jun 2023 12 Jun 2023
4 Open 4 document View SEC filing for 4 FORM 4 SUBMISSION 14 Jun 2023 12 Jun 2023
4 Open 4 document View SEC filing for 4 FORM 4 SUBMISSION 14 Jun 2023 12 Jun 2023
4 Open 4 document View SEC filing for 4 FORM 4 SUBMISSION 14 Jun 2023 12 Jun 2023
4 Open 4 document View SEC filing for 4 FORM 4 SUBMISSION 12 Jun 2023 12 Jun 2023
4 Open 4 document View SEC filing for 4 FORM 4 SUBMISSION 08 Jun 2023 06 Jun 2023
144 Open 144 document View SEC filing for 144 06 Jun 2023 001-32737
4 Open 4 document View SEC filing for 4 FORM 4 SUBMISSION 01 Jun 2023 30 May 2023
4 Open 4 document View SEC filing for 4 FORM 4 SUBMISSION 08 May 2023 04 May 2023
4 Open 4 document View SEC filing for 4 FORM 4 SUBMISSION 08 May 2023 04 May 2023
4 Open 4 document View SEC filing for 4 FORM 4 SUBMISSION 08 May 2023 04 May 2023
4 Open 4 document View SEC filing for 4 FORM 4 SUBMISSION 08 May 2023 04 May 2023
4 Open 4 document View SEC filing for 4 FORM 4 SUBMISSION 08 May 2023 04 May 2023
4 Open 4 document View SEC filing for 4 FORM 4 SUBMISSION 08 May 2023 04 May 2023
4 Open 4 document View SEC filing for 4 FORM 4 SUBMISSION 08 May 2023 04 May 2023
4 Open 4 document View SEC filing for 4 FORM 4 SUBMISSION 08 May 2023 04 May 2023
10-Q Open 10-Q document | Open XBRL data View SEC filing for 10-Q 10-Q 05 May 2023 31 Mar 2023 001-32737
8-K Open 8-K document | Open XBRL data View SEC filing for 8-K 8-K 05 May 2023 04 May 2023 001-32737
8-K/A Open 8-K/A document | Open XBRL data View SEC filing for 8-K/A 8-K/A 04 May 2023 04 May 2023 001-32737
4 Open 4 document View SEC filing for 4 FORM 4 SUBMISSION 01 May 2023 27 Apr 2023
4 Open 4 document View SEC filing for 4 FORM 4 SUBMISSION 01 May 2023 27 Apr 2023
4 Open 4 document View SEC filing for 4 FORM 4 SUBMISSION 01 May 2023 27 Apr 2023
4 Open 4 document View SEC filing for 4 FORM 4 SUBMISSION 01 May 2023 27 Apr 2023
4 Open 4 document View SEC filing for 4 FORM 4 SUBMISSION 01 May 2023 27 Apr 2023
4 Open 4 document View SEC filing for 4 FORM 4 SUBMISSION 01 May 2023 27 Apr 2023
4 Open 4 document View SEC filing for 4 FORM 4 SUBMISSION 01 May 2023 27 Apr 2023
UPLOAD Open UPLOAD document View SEC filing for UPLOAD 28 Apr 2023
CORRESP Open CORRESP document View SEC filing for CORRESP 25 Apr 2023
4 Open 4 document View SEC filing for 4 FORM 4 SUBMISSION 12 Apr 2023 10 Apr 2023
8-K Open 8-K document | Open XBRL data View SEC filing for 8-K 8-K 11 Apr 2023 10 Apr 2023 001-32737
UPLOAD Open UPLOAD document View SEC filing for UPLOAD 11 Apr 2023
ARS Open ARS document View SEC filing for ARS ARS 03 Apr 2023 31 Dec 2022 001-32737
DEF 14A Open DEF 14A document | Open XBRL data View SEC filing for DEF 14A DEF 14A 03 Apr 2023 001-32737
4 Open 4 document View SEC filing for 4 FORM 4 SUBMISSION 29 Mar 2023 27 Mar 2023
4 Open 4 document View SEC filing for 4 FORM 4 SUBMISSION 29 Mar 2023 27 Mar 2023
4 Open 4 document View SEC filing for 4 FORM 4 SUBMISSION 22 Mar 2023 20 Mar 2023
3 Open 3 document View SEC filing for 3 FORM 3 SUBMISSION 22 Mar 2023 20 Mar 2023
8-K Open 8-K document | Open XBRL data View SEC filing for 8-K 8-K 22 Mar 2023 20 Mar 2023 001-32737
8-K Open 8-K document | Open XBRL data View SEC filing for 8-K 8-K 10 Mar 2023 10 Mar 2023 001-32737
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10-Q Open 10-Q document | Open XBRL data View SEC filing for 10-Q 10-Q 03 May 2019 31 Mar 2019 001-32737
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10-K Open 10-K document | Open XBRL data View SEC filing for 10-K 10-K 01 Mar 2019 31 Dec 2018 001-32737
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10-Q Open 10-Q document | Open XBRL data View SEC filing for 10-Q 10-Q 08 Nov 2018 30 Sep 2018 001-32737
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10-Q Open 10-Q document | Open XBRL data View SEC filing for 10-Q 10-Q 09 Aug 2018 30 Jun 2018 001-32737
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4 Open 4 document View SEC filing for 4 FORM 4 SUBMISSION 09 May 2018 08 May 2018
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10-K Open 10-K document | Open XBRL data View SEC filing for 10-K 10-K 27 Feb 2018 31 Dec 2017 001-32737
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10-Q Open 10-Q document | Open XBRL data View SEC filing for 10-Q 10-Q 09 Nov 2017 30 Sep 2017 001-32737
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10-Q Open 10-Q document | Open XBRL data View SEC filing for 10-Q FORM 10-Q 08 May 2017 31 Mar 2017 001-32737
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10-K Open 10-K document | Open XBRL data View SEC filing for 10-K KOP-10K-20161231 24 Feb 2017 31 Dec 2016 001-32737
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10-K Open 10-K document | Open XBRL data View SEC filing for 10-K 10-K 29 Feb 2016 31 Dec 2015 001-32737
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4 Open 4 document View SEC filing for 4 FORM 4 SUBMISSION 26 Jan 2016 22 Jan 2016
4 Open 4 document View SEC filing for 4 FORM 4 SUBMISSION 26 Jan 2016 22 Jan 2016
4 Open 4 document View SEC filing for 4 FORM 4 SUBMISSION 26 Jan 2016 22 Jan 2016
4 Open 4 document View SEC filing for 4 FORM 4 SUBMISSION 26 Jan 2016 22 Jan 2016
4 Open 4 document View SEC filing for 4 FORM 4 SUBMISSION 26 Jan 2016 22 Jan 2016
4 Open 4 document View SEC filing for 4 FORM 4 SUBMISSION 26 Jan 2016 22 Jan 2016
4 Open 4 document View SEC filing for 4 FORM 4 SUBMISSION 26 Jan 2016 22 Jan 2016
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4 Open 4 document View SEC filing for 4 FORM 4 - JAMES T. DIETZ 02 Jun 2015 29 May 2015
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4 Open 4 document View SEC filing for 4 FORM 4 - T. MICHAEL YOUNG 15 May 2015 13 May 2015
4 Open 4 document View SEC filing for 4 FORM 4 - WALTER W. TURNER 15 May 2015 13 May 2015
4 Open 4 document View SEC filing for 4 FORM 4 - STEPHEN R. TRITCH 15 May 2015 13 May 2015
4 Open 4 document View SEC filing for 4 FORM 4 - LOUIS L. TESTONI 15 May 2015 13 May 2015
4 Open 4 document View SEC filing for 4 FORM 4 - ALBERT J. NEUPAVER 15 May 2015 13 May 2015
4 Open 4 document View SEC filing for 4 FORM 4 - DAVID M. HILLENBRAND 15 May 2015 13 May 2015
4 Open 4 document View SEC filing for 4 FORM 4 - SHARON FENG 15 May 2015 13 May 2015
4 Open 4 document View SEC filing for 4 FORM 4 - CYNTHIA A. BALDWIN 15 May 2015 13 May 2015
10-Q Open 10-Q document | Open XBRL data View SEC filing for 10-Q FORM 10-Q 08 May 2015 31 Mar 2015 001-32737
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4 Open 4 document View SEC filing for 4 FORM 4 - LOUIS L. TESTONI 22 Apr 2015 22 Apr 2015
4 Open 4 document View SEC filing for 4 FORM 4 - ALBERT J. NEUPAVER 22 Apr 2015 22 Apr 2015
4 Open 4 document View SEC filing for 4 FORM 4 - DAVID M. HILLENBRAND 22 Apr 2015 22 Apr 2015
4 Open 4 document View SEC filing for 4 FORM 4 - SHARON FENG 22 Apr 2015 22 Apr 2015
4 Open 4 document View SEC filing for 4 FORM 4 - CYNTHIA A. BALDWIN 22 Apr 2015 22 Apr 2015
4/A Open 4/A document View SEC filing for 4/A FORM 4/A - WALTER W. TURNER 09 Apr 2015 03 Mar 2015
4 Open 4 document View SEC filing for 4 FORM 4 - WALTER W. TURNER 08 Apr 2015 03 Mar 2015
ARS Open ARS document View SEC filing for ARS AUTO-GENERATED PAPER DOCUMENT 07 Apr 2015 31 Dec 2014 001-32737
DEF 14A Open DEF 14A document View SEC filing for DEF 14A NOTICE & PROXY STATEMENT 06 Apr 2015 07 May 2015 001-32737
4/A Open 4/A document View SEC filing for 4/A FORM 4/A - ROBIN ZHU 12 Mar 2015 21 Feb 2015
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4 Open 4 document View SEC filing for 4 FORM 4 - ROBIN ZHU 05 Mar 2015 03 Mar 2015
4 Open 4 document View SEC filing for 4 FORM 4 - LOUANN E. TRONSBERG-DEIHLE 05 Mar 2015 03 Mar 2015
4 Open 4 document View SEC filing for 4 FORM 4 - MARKUS G. SPIESS 05 Mar 2015 03 Mar 2015
4 Open 4 document View SEC filing for 4 FORM 4 - LESLIE S. HYDE 05 Mar 2015 03 Mar 2015
4 Open 4 document View SEC filing for 4 FORM 4 - DANIEL R. GROVES 05 Mar 2015 03 Mar 2015
4 Open 4 document View SEC filing for 4 FORM 4 - CHRISTIAN A. NIELSEN 05 Mar 2015 03 Mar 2015
4 Open 4 document View SEC filing for 4 FORM 4 - JOSEPH P. DOWD 05 Mar 2015 03 Mar 2015
4 Open 4 document View SEC filing for 4 FORM 4 - MICHAEL J. ZUGAY 05 Mar 2015 03 Mar 2015
4 Open 4 document View SEC filing for 4 FORM 4 - JAMES A. SULLIVAN 05 Mar 2015 03 Mar 2015
4 Open 4 document View SEC filing for 4 FORM 4 - MARK R. MCCORMACK 05 Mar 2015 03 Mar 2015
4 Open 4 document View SEC filing for 4 FORM 4 - THOMAS D. LOADMAN 05 Mar 2015 03 Mar 2015
4 Open 4 document View SEC filing for 4 FORM 4 - STEVEN R. LACY 05 Mar 2015 03 Mar 2015
4 Open 4 document View SEC filing for 4 FORM 4 - LEROY M. BALL 05 Mar 2015 03 Mar 2015
4 Open 4 document View SEC filing for 4 FORM 4 - JAMES A. SULLIVAN 04 Mar 2015 02 Mar 2015
4 Open 4 document View SEC filing for 4 FORM 4 - STEPHEN R. TRITCH 04 Mar 2015 03 Mar 2015
4 Open 4 document View SEC filing for 4 FORM 4 - ALBERT J. NEUPAVER 04 Mar 2015 03 Mar 2015
4 Open 4 document View SEC filing for 4 FORM 4 - LEROY M. BALL 03 Mar 2015 02 Mar 2015
10-K Open 10-K document | Open XBRL data View SEC filing for 10-K FORM 10-K 02 Mar 2015 31 Dec 2014 001-32737
POSASR Open POSASR document View SEC filing for POSASR POSASR 26 Feb 2015 333-182381
8-K Open 8-K document View SEC filing for 8-K FORM 8-K 26 Feb 2015 26 Feb 2015 001-32737
4 Open 4 document View SEC filing for 4 FORM 4 - ROBIN ZHU 24 Feb 2015 21 Feb 2015
4 Open 4 document View SEC filing for 4 FORM 4 - WALTER W. TURNER 24 Feb 2015 21 Feb 2015
4 Open 4 document View SEC filing for 4 FORM 4 - LOUANN E. TRONSBERG-DEIHLE 24 Feb 2015 21 Feb 2015
4 Open 4 document View SEC filing for 4 FORM 4 - MARKUS G. SPIESS 24 Feb 2015 21 Feb 2015
4 Open 4 document View SEC filing for 4 FORM 4 - THOMAS D. LOADMAN 24 Feb 2015 21 Feb 2015
4 Open 4 document View SEC filing for 4 FORM 4 - STEVEN R. LACY 24 Feb 2015 21 Feb 2015
4 Open 4 document View SEC filing for 4 FORM 4 - LESLIE S. HYDE 24 Feb 2015 21 Feb 2015
4 Open 4 document View SEC filing for 4 FORM 4 - DANIEL R. GROVES 24 Feb 2015 21 Feb 2015
4 Open 4 document View SEC filing for 4 FORM 4 - JAMES T. DIETZ 24 Feb 2015 21 Feb 2015
4 Open 4 document View SEC filing for 4 FORM 4 - WALTER W. TURNER 20 Feb 2015 18 Feb 2015
4 Open 4 document View SEC filing for 4 FORM 4 - STEVEN R. LACY 20 Feb 2015 18 Feb 2015
5 Open 5 document View SEC filing for 5 FORM 5 - WALTER W. TURNER 17 Feb 2015 31 Dec 2014
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5 Open 5 document View SEC filing for 5 FORM 5 - DAVID M. HILLENBRAND 17 Feb 2015 31 Dec 2014
5 Open 5 document View SEC filing for 5 FORM 5 - JAMES T. DIETZ 17 Feb 2015 31 Dec 2014
3 Open 3 document View SEC filing for 3 FORM 3 - CHRISTIAN A. NIELSEN 13 Feb 2015 04 Feb 2015
SC 13G Open SC 13G document View SEC filing for SC 13G SCHEDULE 13G 13 Feb 2015 005-81507
SC 13G/A Open SC 13G/A document View SEC filing for SC 13G/A KOP AS OF 12/31/2014 13 Feb 2015 005-81507
SC 13G/A Open SC 13G/A document View SEC filing for SC 13G/A SEC SCHEDULE 13G 12 Feb 2015 005-81507
SC 13G/A Open SC 13G/A document View SEC filing for SC 13G/A 10 Feb 2015 005-81507
8-K Open 8-K document View SEC filing for 8-K FORM 8-K 06 Feb 2015 04 Feb 2015 001-32737
SC 13G/A Open SC 13G/A document View SEC filing for SC 13G/A 22 Jan 2015 005-81507
8-K Open 8-K document View SEC filing for 8-K FORM 8-K 22 Jan 2015 22 Jan 2015 001-32737
8-K Open 8-K document View SEC filing for 8-K FORM 8-K 14 Jan 2015 14 Jan 2015 001-32737
4 Open 4 document View SEC filing for 4 FORM 4 - ROBIN ZHU 06 Jan 2015 02 Jan 2015
4 Open 4 document View SEC filing for 4 FORM 4 - WALTER W. TURNER 06 Jan 2015 02 Jan 2015
4 Open 4 document View SEC filing for 4 FORM 4 - LOUANN E. TRONSBERG-DEIHLE 06 Jan 2015 02 Jan 2015

About this filer

Koppers Holdings Inc. files with the SEC under CIK 0001315257. This page aggregates EDGAR filings and related ownership activity.

Industry: Lumber & Wood Products (No Furniture).

See insider transactions for this issuer.

FAQ

What is a CIK?
A Central Index Key (CIK) is a unique identifier assigned by the SEC to each filer.
Why are some filings missing?
New filings appear as the SEC updates EDGAR, and older records can vary by availability.
How often is this page updated?
Updates follow new EDGAR submissions and periodic data refreshes.

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