Koppers Holdings Inc.https://pcaobus.org/form-ap-filings/34164/34164Koppers Holdings Inc.341643/7/2019 5:22:38 AM2018c10072f3-b24b-4522-999e-53748c24b188185KPMG LLP302181Koppers Holdings Inc.1315257KOP0018500062Robert Joseph Steen00185000621020#^#1012KPMG#^#KPMG Accountants N.V.True
Koppers Holdings Inc.https://pcaobus.org/form-ap-filings/19255/19255Koppers Holdings Inc.192553/19/2018 2:20:56 AM2017742dfec5-4b45-4107-8c9f-27df98623ddf185KPMG LLP302181Koppers Holdings Inc.1315257KOP0018500062Robert Joseph Steen00185000621020#^#1012KPMG#^#KPMG Accountants N.V.True
Koppers Holdings Inc.https://pcaobus.org/form-ap-filings/2820/2820Koppers Holdings Inc.28203/16/2017 5:51:14 AM2016c7e558c1-13cc-4087-95c8-3fcba92efe10185KPMG LLP302181Koppers Holdings Inc.1315257KOP0018500062Robert Joseph Steen0018500062True