{"transactions":[{"id":784480,"issuer":{"id":5058,"kind":"organization","name":"Koppers Holdings Inc.","symbol":"KOP"},"owners":[{"id":48301,"kind":"person","name":"Posadas Laura J","position":1,"cik":"0002092070","reported_name":"Posadas Laura J","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Dividend Equivalent Rights","published_at":"2026-05-11T20:13:12.000Z","date":"2026-05-07","kind":"exercise","planned":false,"acquired":false,"shares":11,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F3","text":"These DERs were released in connection with the vesting of RSUs granted on November 5, 2025. Each DER is the economic equivalent of one share of Koppers Holdings Inc. common stock."},{"field":"shares","element":"transactionShares","label":"F3","text":"These DERs were released in connection with the vesting of RSUs granted on November 5, 2025. Each DER is the economic equivalent of one share of Koppers Holdings Inc. common stock."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F3","text":"These DERs were released in connection with the vesting of RSUs granted on November 5, 2025. Each DER is the economic equivalent of one share of Koppers Holdings Inc. common stock."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F3","text":"These DERs were released in connection with the vesting of RSUs granted on November 5, 2025. Each DER is the economic equivalent of one share of Koppers Holdings Inc. common stock."}],"balance_after":0,"derivative":{"underlying":"Common Stock","underlying_shares":11},"source":{"system":"sec-edgar","filing":"0002092070-26-000004","document":"wk-form4_1778530389.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1315257/000209207026000004/wk-form4_1778530389.xml","form_type":"4"}},{"id":784479,"issuer":{"id":5058,"kind":"organization","name":"Koppers Holdings Inc.","symbol":"KOP"},"owners":[{"id":48301,"kind":"person","name":"Posadas Laura J","position":1,"cik":"0002092070","reported_name":"Posadas Laura J","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common  Stock","published_at":"2026-05-11T20:13:12.000Z","date":"2026-05-07","kind":"grant","planned":false,"acquired":true,"shares":3280,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"security","element":"securityTitle","label":"F2","text":"The reporting person was awarded time-based restricted stock units (\"RSUs\")."}],"balance_after":5531,"source":{"system":"sec-edgar","filing":"0002092070-26-000004","document":"wk-form4_1778530389.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1315257/000209207026000004/wk-form4_1778530389.xml","form_type":"4"}},{"id":784478,"issuer":{"id":5058,"kind":"organization","name":"Koppers Holdings Inc.","symbol":"KOP"},"owners":[{"id":48301,"kind":"person","name":"Posadas Laura J","position":1,"cik":"0002092070","reported_name":"Posadas Laura J","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common  Stock","published_at":"2026-05-11T20:13:12.000Z","date":"2026-05-07","kind":"exercise","planned":false,"acquired":true,"shares":11,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents shares acquired upon release of dividend equivalent rights (\"DERs\"), as reported in Table II, on a one-for-one basis."},{"field":"price","element":"transactionPricePerShare","label":"F1","text":"Represents shares acquired upon release of dividend equivalent rights (\"DERs\"), as reported in Table II, on a one-for-one basis."}],"balance_after":2251,"source":{"system":"sec-edgar","filing":"0002092070-26-000004","document":"wk-form4_1778530389.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1315257/000209207026000004/wk-form4_1778530389.xml","form_type":"4"}},{"id":828131,"issuer":{"id":5058,"kind":"organization","name":"Koppers Holdings Inc.","symbol":"KOP"},"owners":[{"id":48301,"kind":"person","name":"Posadas Laura J","position":1,"cik":"0002092070","reported_name":"Posadas Laura J","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Dividend Equivalent Rights","published_at":"2026-03-25T20:17:04.000Z","date":"2026-03-23","kind":"grant","planned":false,"acquired":true,"shares":11,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"The dividend equivalent rights (\"DERs\") accrued with respect to additional time-based restricted stock units (\"RSUs\") credited to the reporting person with respect to RSUs granted on November 5, 2025. Each DER is the economic equivalent of one share of Koppers Holdings Inc. common stock."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"The dividend equivalent rights (\"DERs\") accrued with respect to additional time-based restricted stock units (\"RSUs\") credited to the reporting person with respect to RSUs granted on November 5, 2025. Each DER is the economic equivalent of one share of Koppers Holdings Inc. common stock."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F1","text":"The dividend equivalent rights (\"DERs\") accrued with respect to additional time-based restricted stock units (\"RSUs\") credited to the reporting person with respect to RSUs granted on November 5, 2025. Each DER is the economic equivalent of one share of Koppers Holdings Inc. common stock."}],"balance_after":11,"derivative":{"underlying":"Common Stock","underlying_shares":11},"source":{"system":"sec-edgar","filing":"0002092070-26-000002","document":"wk-form4_1774469821.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1315257/000209207026000002/wk-form4_1774469821.xml","form_type":"4"}},{"id":1004729,"issuer":{"id":5058,"kind":"organization","name":"Koppers Holdings Inc.","symbol":"KOP"},"owners":[{"id":48301,"kind":"person","name":"Posadas Laura J","position":1,"cik":"0002092070","reported_name":"Posadas Laura J","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Commmon Stock","published_at":"2025-11-07T21:27:18.000Z","date":"2025-11-05","kind":"grant","planned":false,"acquired":true,"shares":2240,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"security","element":"securityTitle","label":"F1","text":"The reporting person was awarded time-based restricted stock units."}],"balance_after":2240,"source":{"system":"sec-edgar","filing":"0002092070-25-000004","document":"wk-form4_1762550835.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1315257/000209207025000004/wk-form4_1762550835.xml","form_type":"4"}}]}