Koppers Holdings Inc. KOP · SEC Filings

1.9K

Koppers Holdings Inc., established in 1988 and headquartered in Pittsburgh, Pennsylvania, operates a...

Price29.33

Market Cap554.68 M

Float16.75 M

CountryUS

SectorBasic Materials

ExchangeNYSE

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Financials

TYPE

HEADLINE

FILED AT

10-Q

Form 10-Q - Quarterly report [Sections 13 or 15(d)]

Nov 6, 2026

10-Q

Form 10-Q - Quarterly report [Sections 13 or 15(d)]

Aug 6, 2026

10-Q

Form 10-Q - Quarterly report [Sections 13 or 15(d)]

May 8, 2026

10-K

Form 10-K - Annual report [Section 13 and 15(d), not S-K Item 405]

Feb 26, 2026

10-Q

Form 10-Q - Quarterly report [Sections 13 or 15(d)]

Nov 7, 2025

10-Q

Form 10-Q - Quarterly report [Sections 13 or 15(d)]

Aug 8, 2025

News

TYPE

HEADLINE

FILED AT

Prospectus

TYPE

HEADLINE

FILED AT

424B3

Form 424B3 - Prospectus [Rule 424(b)(3)]

Feb 27, 2020

424B3

Form 424B3 - Prospectus [Rule 424(b)(3)]

May 14, 2010

424B3

Form 424B3 - Prospectus [Rule 424(b)(3)]

Sep 25, 2009

424B3

Form 424B3 - Prospectus [Rule 424(b)(3)]

Feb 27, 2007

424B3

Form 424B3 - Prospectus [Rule 424(b)(3)]

Nov 28, 2006

424B3

Form 424B3 - Prospectus [Rule 424(b)(3)]

Sep 11, 2006

Registrations

TYPE

HEADLINE

FILED AT

S-8

Form S-8 - Securities to be offered to employees in employee benefit plans

May 8, 2026

S-8

Form S-8 - Securities to be offered to employees in employee benefit plans

May 9, 2025

S-8

Form S-8 - Securities to be offered to employees in employee benefit plans

Aug 6, 2021

S-8

Form S-8 - Securities to be offered to employees in employee benefit plans

May 7, 2021

S-8

Form S-8 - Securities to be offered to employees in employee benefit plans

May 7, 2021

S-8

Form S-8 - Securities to be offered to employees in employee benefit plans

May 6, 2020

Proxies

TYPE

HEADLINE

FILED AT

DEF 14A

Form DEF 14A - Other definitive proxy statements

Mar 27, 2026

DEFA14A

Form DEFA14A - Additional definitive proxy soliciting materials and Rule 14(a)(12) material

Apr 11, 2025

DEF 14A

Form DEF 14A - Other definitive proxy statements

Mar 28, 2025

DEF 14A

Form DEF 14A - Other definitive proxy statements

Apr 2, 2024

PRE 14A

Form PRE 14A - Other preliminary proxy statements

Mar 8, 2024

DEF 14A

Form DEF 14A - Other definitive proxy statements

Apr 3, 2023

Ownerships

TYPE

HEADLINE

FILED AT

Other

TYPE

HEADLINE

FILED AT

LETTER

Form UPLOAD - SEC-generated letter

Apr 28, 2023

CORRESP

Form CORRESP - Correspondence

Apr 25, 2023

LETTER

Form UPLOAD - SEC-generated letter

Apr 11, 2023

LETTER

Form UPLOAD - SEC-generated letter

Apr 2, 2014

CORRESP

Form CORRESP - Correspondence

Mar 12, 2014

CORRESP

Form CORRESP - Correspondence

Mar 6, 2014