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Mailing Address 436 SEVENTH AVENUE PITTSBURGH PA 15219
Business Address 436 SEVENTH AVENUE PITTSBURGH PA 15219 412-227-2001
Koppers Holdings Inc. CIK#: 0001315257 (see all company filings)

SIC: 2400 - LUMBER & WOOD PRODUCTS (NO FURNITURE)
State location: PA | State of Inc.: PA | Fiscal Year End: 1231
formerly: KI Holdings Inc. (filings through 2005-11-14)
(CF Office: 04 Manufacturing)
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Items 1 - 40  0001315257 Filings RSS Feed
Filings Format Description Filing Date File/Film Number
10-Q  Documents   Interactive Data Quarterly report [Sections 13 or 15(d)]
Acc-no: 0000950170-24-052678 (34 Act)  Size: 9 MB
2024-05-03 001-32737
24912258
8-K  Documents   Interactive Data Current report, items 2.02, 5.03, 5.07, and 9.01
Acc-no: 0000950170-24-052494 (34 Act)  Size: 648 KB
2024-05-03 001-32737
24910887
8-K/A  Documents   Interactive Data [Amend] Current report, items 5.02 and 9.01
Acc-no: 0000950170-24-052134 (34 Act)  Size: 156 KB
2024-05-02 001-32737
24908458
8-K  Documents   Interactive Data Current report, items 1.01, 2.03, and 9.01
Acc-no: 0001193125-24-095544 (34 Act)  Size: 1 MB
2024-04-15 001-32737
24843151
ARS  Documents Annual Report to Security Holders
Acc-no: 0000950170-24-040253 (34 Act)  Size: 10 MB
2024-04-02 001-32737
24814944
DEF 14A  Documents   Interactive Data Other definitive proxy statements
Acc-no: 0001193125-24-084813 (34 Act)  Size: 17 MB
2024-04-02 001-32737
24814871
PRE 14A  Documents   Interactive Data Other preliminary proxy statements
Acc-no: 0001193125-24-063704 (34 Act)  Size: 17 MB
2024-03-08 001-32737
24734923
10-K  Documents   Interactive Data Annual report [Section 13 and 15(d), not S-K Item 405]
Acc-no: 0000950170-24-021787 (34 Act)  Size: 19 MB
2024-02-28 001-32737
24692393
8-K  Documents   Interactive Data Current report, items 2.02 and 9.01
Acc-no: 0000950170-24-021675 (34 Act)  Size: 860 KB
2024-02-28 001-32737
24690355
SC 13G/A  Documents [Amend] Statement of acquisition of beneficial ownership by individuals
Acc-no: 0001104659-24-021302 (34 Act)  Size: 13 KB
2024-02-13 005-81507
24628798
8-K  Documents   Interactive Data Current report, items 5.02 and 9.01
Acc-no: 0000950170-24-014607 (34 Act)  Size: 198 KB
2024-02-13 001-32737
24626521
SC 13G/A  Documents [Amend] Statement of acquisition of beneficial ownership by individuals
Acc-no: 0001082327-24-000040 (34 Act)  Size: 7 KB
2024-02-12 005-81507
24622139
SC 13G/A  Documents [Amend] Statement of acquisition of beneficial ownership by individuals
Acc-no: 0001104659-24-013555 (34 Act)  Size: 79 KB
2024-02-12 005-81507
24617223
SC 13G  Documents Statement of acquisition of beneficial ownership by individuals
Acc-no: 0000354204-24-003002 (34 Act)  Size: 19 KB
2024-02-09 005-81507
24612245
SC 13G/A  Documents [Amend] Statement of acquisition of beneficial ownership by individuals
Acc-no: 0001086364-24-000777 (34 Act)  Size: 13 KB
2024-01-22 005-81507
24548103
8-K  Documents   Interactive Data Current report, items 5.02, 8.01, and 9.01
Acc-no: 0000950170-24-000286 (34 Act)  Size: 196 KB
2024-01-02 001-32737
24502874
10-Q  Documents   Interactive Data Quarterly report [Sections 13 or 15(d)]
Acc-no: 0000950170-23-058640 (34 Act)  Size: 14 MB
2023-11-03 001-32737
231375233
8-K  Documents   Interactive Data Current report, items 2.02 and 9.01
Acc-no: 0000950170-23-058530 (34 Act)  Size: 1 MB
2023-11-03 001-32737
231374560
8-K  Documents   Interactive Data Current report, items 1.01, 2.03, and 9.01
Acc-no: 0001193125-23-254683 (34 Act)  Size: 1 MB
2023-10-12 001-32737
231321791
8-K  Documents   Interactive Data Current report, items 7.01 and 9.01
Acc-no: 0000950170-23-048041 (34 Act)  Size: 221 KB
2023-09-14 001-32737
231254090
8-K  Documents   Interactive Data Current report, items 5.03 and 9.01
Acc-no: 0000950170-23-038090 (34 Act)  Size: 510 KB
2023-08-03 001-32737
231140664
10-Q  Documents   Interactive Data Quarterly report [Sections 13 or 15(d)]
Acc-no: 0000950170-23-037727 (34 Act)  Size: 18 MB
2023-08-03 001-32737
231138876
8-K  Documents   Interactive Data Current report, items 2.02 and 9.01
Acc-no: 0000950170-23-037613 (34 Act)  Size: 1 MB
2023-08-03 001-32737
231138228
10-Q  Documents   Interactive Data Quarterly report [Sections 13 or 15(d)]
Acc-no: 0000950170-23-018172 (34 Act)  Size: 13 MB
2023-05-05 001-32737
23892254
8-K  Documents   Interactive Data Current report, items 2.02, 5.07, and 9.01
Acc-no: 0000950170-23-018095 (34 Act)  Size: 970 KB
2023-05-05 001-32737
23891441
8-K/A  Documents   Interactive Data [Amend] Current report, items 5.02 and 9.01
Acc-no: 0000950170-23-017934 (34 Act)  Size: 173 KB
2023-05-04 001-32737
23889339
UPLOAD  Documents [Cover]SEC-generated letter
Acc-no: 0000000000-23-004354 Size: 39 KB
2023-04-28
CORRESP  Documents [Cover]Correspondence
Acc-no: 0000950170-23-014269 Size: 55 KB
2023-04-25
8-K  Documents   Interactive Data Current report, items 1.01, 2.03, and 9.01
Acc-no: 0001193125-23-097892 (34 Act)  Size: 1 MB
2023-04-11 001-32737
23813826
UPLOAD  Documents [Cover]SEC-generated letter
Acc-no: 0000000000-23-003604 Size: 52 KB
2023-04-11
ARS  Documents Annual Report to Security Holders
Acc-no: 0000950170-23-011615 (34 Act)  Size: 14 MB
2023-04-03 001-32737
23793325
DEF 14A  Documents   Interactive Data Other definitive proxy statements
Acc-no: 0001193125-23-089616 (34 Act)  Size: 12 MB
2023-04-03 001-32737
23793216
8-K  Documents   Interactive Data Current report, items 5.02 and 9.01
Acc-no: 0000950170-23-009213 (34 Act)  Size: 221 KB
2023-03-22 001-32737
23753422
8-K  Documents   Interactive Data Current report, items 8.01 and 9.01
Acc-no: 0000950170-23-007354 (34 Act)  Size: 223 KB
2023-03-10 001-32737
23724715
10-K  Documents   Interactive Data Annual report [Section 13 and 15(d), not S-K Item 405]
Acc-no: 0000950170-23-004546 (34 Act)  Size: 25 MB
2023-02-27 001-32737
23671835
8-K  Documents   Interactive Data Current report, items 2.02 and 9.01
Acc-no: 0000950170-23-004484 (34 Act)  Size: 1 MB
2023-02-27 001-32737
23670209
SC 13G/A  Documents [Amend] Statement of acquisition of beneficial ownership by individuals
Acc-no: 0001082327-23-000037 (34 Act)  Size: 7 KB
2023-02-14 005-81507
23626567
SC 13G/A  Documents [Amend] Statement of acquisition of beneficial ownership by individuals
Acc-no: 0001104659-23-018472 (34 Act)  Size: 78 KB
2023-02-10 005-81507
23611620
SC 13G/A  Documents [Amend] Statement of acquisition of beneficial ownership by individuals
Acc-no: 0001104659-23-016311 (34 Act)  Size: 13 KB
2023-02-09 005-81507
23603727
SC 13G/A  Documents [Amend] Statement of acquisition of beneficial ownership by individuals
Acc-no: 0001306550-23-004141 (34 Act)  Size: 13 KB
2023-01-26 005-81507
23554335