{"transactions":[{"id":4618042,"issuer":{"id":5058,"kind":"organization","name":"Koppers Holdings Inc.","symbol":"KOP"},"owners":[{"id":37241,"kind":"person","name":"Feng Xudong","position":1,"cik":"0001463649","reported_name":"Feng Xudong","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Dividend Equivalent Rights","published_at":"2026-09-15T20:19:12.000Z","date":"2026-09-14","kind":"grant","planned":false,"acquired":true,"shares":32.946,"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 restricted stock units (\"RSUs\") credited to the reporting person with respect to deferred compensation. Each DER is the\neconomic equivalent of one share of Koppers Holdings Inc. common stock."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F2","text":"Once released, the RSUs corresponding to these DERs will become payable according to the election of payment designation that was filed by the reporting person subject to the Koppers Holdings Inc. Director Deferred Compensation Plan (the \"Plan\"). Such payment will be either lump sum or in annual installments commencing on the May 31st next following the reporting person's separation from service (as defined under the Plan) or, if later, and elected by the reporting person at the time he/she first elects to defer any payment under the Plan, May 31st of the year specified by the reporting person."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F2","text":"Once released, the RSUs corresponding to these DERs will become payable according to the election of payment designation that was filed by the reporting person subject to the Koppers Holdings Inc. Director Deferred Compensation Plan (the \"Plan\"). Such payment will be either lump sum or in annual installments commencing on the May 31st next following the reporting person's separation from service (as defined under the Plan) or, if later, and elected by the reporting person at the time he/she first elects to defer any payment under the Plan, May 31st of the year specified by the reporting person."}],"balance_after":444.837,"derivative":{"underlying":"Common Stock","underlying_shares":32.946},"source":{"system":"sec-edgar","filing":"0001463649-26-000006","document":"wk-form4_1789503549.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1463649/000146364926000006/wk-form4_1789503549.xml","form_type":"4"}},{"id":733984,"issuer":{"id":5058,"kind":"organization","name":"Koppers Holdings Inc.","symbol":"KOP"},"owners":[{"id":37241,"kind":"person","name":"Feng Xudong","position":1,"cik":"0001463649","reported_name":"Feng Xudong","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Dividend Equivalent Rights","published_at":"2026-06-17T20:09:03.000Z","date":"2026-06-15","kind":"grant","planned":false,"acquired":true,"shares":34.065,"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 restricted stock units (\"RSUs\") credited to the reporting person with respect to deferred compensation. Each DER is the\neconomic equivalent of one share of Koppers Holdings Inc. common stock."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F2","text":"Once released, the RSUs corresponding to these DERs will become payable according to the election of payment designation that was filed by the reporting person subject to the Koppers Holdings Inc. Director Deferred Compensation Plan (the \"Plan\"). Such payment will be either lump sum or in annual installments commencing on the May 31st next following the reporting person's separation from service (as defined under the Plan) or, if later, and elected by the reporting person at the time he/she first elects to defer any payment under the Plan, May 31st of the year specified by the reporting person."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F2","text":"Once released, the RSUs corresponding to these DERs will become payable according to the election of payment designation that was filed by the reporting person subject to the Koppers Holdings Inc. Director Deferred Compensation Plan (the \"Plan\"). Such payment will be either lump sum or in annual installments commencing on the May 31st next following the reporting person's separation from service (as defined under the Plan) or, if later, and elected by the reporting person at the time he/she first elects to defer any payment under the Plan, May 31st of the year specified by the reporting person."}],"balance_after":411.891,"derivative":{"underlying":"Common Stock","underlying_shares":34.065},"source":{"system":"sec-edgar","filing":"0001463649-26-000004","document":"wk-form4_1781726939.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1463649/000146364926000004/wk-form4_1781726939.xml","form_type":"4"}},{"id":749489,"issuer":{"id":5058,"kind":"organization","name":"Koppers Holdings Inc.","symbol":"KOP"},"owners":[{"id":37241,"kind":"person","name":"Feng Xudong","position":1,"cik":"0001463649","reported_name":"Feng Xudong","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2026-06-04T20:05:06.000Z","date":"2026-06-03","kind":"gift","planned":false,"acquired":false,"shares":5695,"price":0,"value":0.0,"ownership":{"direct":true},"balance_after":26489,"source":{"system":"sec-edgar","filing":"0001315257-26-000043","document":"wk-form4_1780603501.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1463649/000131525726000043/wk-form4_1780603501.xml","form_type":"4"}},{"id":784642,"issuer":{"id":5058,"kind":"organization","name":"Koppers Holdings Inc.","symbol":"KOP"},"owners":[{"id":37241,"kind":"person","name":"Feng Xudong","position":1,"cik":"0001463649","reported_name":"Feng Xudong","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2026-05-11T20:10:55.000Z","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":"F1","text":"The reporting person was awarded time-based restricted stock units."}],"balance_after":32184,"source":{"system":"sec-edgar","filing":"0001463649-26-000002","document":"wk-form4_1778530252.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1463649/000146364926000002/wk-form4_1778530252.xml","form_type":"4"}},{"id":828200,"issuer":{"id":5058,"kind":"organization","name":"Koppers Holdings Inc.","symbol":"KOP"},"owners":[{"id":37241,"kind":"person","name":"Feng Xudong","position":1,"cik":"0001463649","reported_name":"Feng Xudong","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Dividend Equivalent Rights","published_at":"2026-03-25T20:09:09.000Z","date":"2026-03-23","kind":"grant","planned":false,"acquired":true,"shares":29.91,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F3","text":"The DERs accrued with respect to additional RSUs credited to the reporting person with respect to deferred compensation. Each DER is the economic equivalent of one share of Koppers Holdings Inc. common stock."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F2","text":"Once released, the RSUs corresponding to these DERs will become payable according to the election of payment designation that was filed by the reporting person subject to the Koppers Holdings\nInc. Director Deferred Compensation Plan (the \"Plan\"). Such payment will be either lump sum or in annual installments commencing on the May 31st next following the reporting person's separation\nfrom service (as defined under the Plan) or, if later, and elected by the reporting person at the time he/she first elects to defer any payment under the Plan, May 31st of the year specified by the reporting\nperson."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F2","text":"Once released, the RSUs corresponding to these DERs will become payable according to the election of payment designation that was filed by the reporting person subject to the Koppers Holdings\nInc. Director Deferred Compensation Plan (the \"Plan\"). Such payment will be either lump sum or in annual installments commencing on the May 31st next following the reporting person's separation\nfrom service (as defined under the Plan) or, if later, and elected by the reporting person at the time he/she first elects to defer any payment under the Plan, May 31st of the year specified by the reporting\nperson."}],"balance_after":377.826,"derivative":{"underlying":"Common Stock","underlying_shares":29.91},"source":{"system":"sec-edgar","filing":"0001315257-26-000022","document":"wk-form4_1774469347.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1463649/000131525726000022/wk-form4_1774469347.xml","form_type":"4"}},{"id":828199,"issuer":{"id":5058,"kind":"organization","name":"Koppers Holdings Inc.","symbol":"KOP"},"owners":[{"id":37241,"kind":"person","name":"Feng Xudong","position":1,"cik":"0001463649","reported_name":"Feng Xudong","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Dividend Equivalent Rights","published_at":"2026-03-25T20:09:09.000Z","date":"2026-03-23","kind":"grant","planned":false,"acquired":true,"shares":50,"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 May 8, 2025. Each DER is the economic equivalent of one share of Koppers Holdings Inc. common stock."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F2","text":"Once released, the RSUs corresponding to these DERs will become payable according to the election of payment designation that was filed by the reporting person subject to the Koppers Holdings\nInc. Director Deferred Compensation Plan (the \"Plan\"). Such payment will be either lump sum or in annual installments commencing on the May 31st next following the reporting person's separation\nfrom service (as defined under the Plan) or, if later, and elected by the reporting person at the time he/she first elects to defer any payment under the Plan, May 31st of the year specified by the reporting\nperson."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F2","text":"Once released, the RSUs corresponding to these DERs will become payable according to the election of payment designation that was filed by the reporting person subject to the Koppers Holdings\nInc. Director Deferred Compensation Plan (the \"Plan\"). Such payment will be either lump sum or in annual installments commencing on the May 31st next following the reporting person's separation\nfrom service (as defined under the Plan) or, if later, and elected by the reporting person at the time he/she first elects to defer any payment under the Plan, May 31st of the year specified by the reporting\nperson."}],"balance_after":347.916,"derivative":{"underlying":"Common Stock","underlying_shares":50},"source":{"system":"sec-edgar","filing":"0001315257-26-000022","document":"wk-form4_1774469347.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1463649/000131525726000022/wk-form4_1774469347.xml","form_type":"4"}},{"id":964887,"issuer":{"id":5058,"kind":"organization","name":"Koppers Holdings Inc.","symbol":"KOP"},"owners":[{"id":37241,"kind":"person","name":"Feng Xudong","position":1,"cik":"0001463649","reported_name":"Feng Xudong","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Dividend Equivalent Rights","published_at":"2025-12-17T22:08:19.000Z","date":"2025-12-16","kind":"grant","planned":false,"acquired":true,"shares":33.442,"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 restricted stock units (\"RSUs\") credited to the reporting person with respect to deferred compensation. Each DER is the\neconomic equivalent of one share of Koppers Holdings Inc. common stock."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F2","text":"Once released, the RSUs corresponding to these DERs will become payable according to the election of payment designation that was filed by the reporting person subject to the Koppers Holdings Inc. Director Deferred Compensation Plan (the \"Plan\"). Such payment will be either lump sum or in annual installments commencing on the May 31st next following the reporting person's separation from service (as defined under the Plan) or, if later, and elected by the reporting person at the time he/she first elects to defer any payment under the Plan, May 31st of the year specified by the reporting person."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F2","text":"Once released, the RSUs corresponding to these DERs will become payable according to the election of payment designation that was filed by the reporting person subject to the Koppers Holdings Inc. Director Deferred Compensation Plan (the \"Plan\"). Such payment will be either lump sum or in annual installments commencing on the May 31st next following the reporting person's separation from service (as defined under the Plan) or, if later, and elected by the reporting person at the time he/she first elects to defer any payment under the Plan, May 31st of the year specified by the reporting person."}],"balance_after":297.916,"derivative":{"underlying":"Common Stock","underlying_shares":33.442},"source":{"system":"sec-edgar","filing":"0001463649-25-000005","document":"wk-form4_1766009295.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1463649/000146364925000005/wk-form4_1766009295.xml","form_type":"4"}},{"id":1037693,"issuer":{"id":5058,"kind":"organization","name":"Koppers Holdings Inc.","symbol":"KOP"},"owners":[{"id":37241,"kind":"person","name":"Feng Xudong","position":1,"cik":"0001463649","reported_name":"Feng Xudong","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Dividend Equivalent Rights","published_at":"2025-09-17T20:08:15.000Z","date":"2025-09-15","kind":"grant","planned":false,"acquired":true,"shares":33.338,"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 restricted stock units (\"RSUs\") credited to the reporting person with respect to deferred compensation. Each DER is the economic equivalent of one share of Koppers Holdings Inc. common stock."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F2","text":"Once released, the RSUs corresponding to these DERs will become payable according to the election of payment designation that was filed by the reporting person subject to the Koppers Holdings Inc. Director Deferred Compensation Plan (the \"Plan\"). Such payment will be either lump sum or in annual installments commencing on the May 31st next following the reporting person's separation from service (as defined under the Plan) or, if later, and elected by the reporting person at the time he/she first elects to defer any payment under the Plan, May 31st of the year specified by the reporting person."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F2","text":"Once released, the RSUs corresponding to these DERs will become payable according to the election of payment designation that was filed by the reporting person subject to the Koppers Holdings Inc. Director Deferred Compensation Plan (the \"Plan\"). Such payment will be either lump sum or in annual installments commencing on the May 31st next following the reporting person's separation from service (as defined under the Plan) or, if later, and elected by the reporting person at the time he/she first elects to defer any payment under the Plan, May 31st of the year specified by the reporting person."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"Includes 30.109 DERs that inadvertently were not previously reported."}],"balance_after":264.474,"derivative":{"underlying":"Common Stock","underlying_shares":33.338},"source":{"system":"sec-edgar","filing":"0001463649-25-000003","document":"wk-form4_1758139693.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1463649/000146364925000003/wk-form4_1758139693.xml","form_type":"4"}},{"id":1153666,"issuer":{"id":5058,"kind":"organization","name":"Koppers Holdings Inc.","symbol":"KOP"},"owners":[{"id":37241,"kind":"person","name":"Feng Xudong","position":1,"cik":"0001463649","reported_name":"Feng Xudong","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Restricted Stock Units","published_at":"2025-05-09T20:05:34.000Z","date":"2025-05-08","kind":"grant","planned":false,"acquired":true,"shares":4778,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"Restricted Stock Units (\"RSUs\") represent the right to receive shares of common stock on a one-for-one basis."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F2","text":"The RSUs become payable according to the election of payment designation that was filed by the reporting person subject to the Koppers Holdings Inc. Director Deferred Compensation Plan (the \"Plan\"). Such payment will be either lump sum or in annual installments commencing on the May 31st next following the reporting person's separation from service (as defined under the Plan) or, if later, and elected by the reporting person at the time he/she first elects to defer any payment under the Plan, May 31st of the year specified by the reporting person."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F2","text":"The RSUs become payable according to the election of payment designation that was filed by the reporting person subject to the Koppers Holdings Inc. Director Deferred Compensation Plan (the \"Plan\"). Such payment will be either lump sum or in annual installments commencing on the May 31st next following the reporting person's separation from service (as defined under the Plan) or, if later, and elected by the reporting person at the time he/she first elects to defer any payment under the Plan, May 31st of the year specified by the reporting person."}],"balance_after":16477.478,"derivative":{"underlying":"Common Stock","underlying_shares":4778},"source":{"system":"sec-edgar","filing":"0000950170-25-068006","document":"ownership.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1463649/000095017025068006/ownership.xml","form_type":"4"}},{"id":1190842,"issuer":{"id":5058,"kind":"organization","name":"Koppers Holdings Inc.","symbol":"KOP"},"owners":[{"id":37241,"kind":"person","name":"Feng Xudong","position":1,"cik":"0001463649","reported_name":"Feng Xudong","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Dividend Equivalent Rights","published_at":"2025-03-26T20:54:11.000Z","date":"2025-03-24","kind":"grant","planned":false,"acquired":true,"shares":27.244,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F3","text":"The DERs accrued with respect to additional RSUs credited to the reporting person with respect to deferred compensation. Each DER is the economic equivalent of one share of Koppers Holdings Inc. common stock."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F2","text":"Once released, the RSUs corresponding to these DERs will become payable according to the election of payment designation that was filed by the reporting person subject to the Koppers Holdings Inc. Director Deferred Compensation Plan (the \"Plan\"). Such payment will be either lump sum or in annual installments commencing on the May 31st next following the reporting person's separation from service (as defined under the Plan) or, if later, and elected by the reporting person at the time he/she first elects to defer any payment under the Plan, May 31st of the year specified by the reporting person."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F2","text":"Once released, the RSUs corresponding to these DERs will become payable according to the election of payment designation that was filed by the reporting person subject to the Koppers Holdings Inc. Director Deferred Compensation Plan (the \"Plan\"). Such payment will be either lump sum or in annual installments commencing on the May 31st next following the reporting person's separation from service (as defined under the Plan) or, if later, and elected by the reporting person at the time he/she first elects to defer any payment under the Plan, May 31st of the year specified by the reporting person."}],"balance_after":201.027,"derivative":{"underlying":"Common Stock","underlying_shares":27.244},"source":{"system":"sec-edgar","filing":"0000950170-25-045377","document":"ownership.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1463649/000095017025045377/ownership.xml","form_type":"4"}},{"id":1190841,"issuer":{"id":5058,"kind":"organization","name":"Koppers Holdings Inc.","symbol":"KOP"},"owners":[{"id":37241,"kind":"person","name":"Feng Xudong","position":1,"cik":"0001463649","reported_name":"Feng Xudong","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Dividend Equivalent Rights","published_at":"2025-03-26T20:54:11.000Z","date":"2025-03-24","kind":"grant","planned":false,"acquired":true,"shares":17,"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 May 2, 2024. Each DER is the economic equivalent of one share of Koppers Holdings Inc. common stock."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F2","text":"Once released, the RSUs corresponding to these DERs will become payable according to the election of payment designation that was filed by the reporting person subject to the Koppers Holdings Inc. Director Deferred Compensation Plan (the \"Plan\"). Such payment will be either lump sum or in annual installments commencing on the May 31st next following the reporting person's separation from service (as defined under the Plan) or, if later, and elected by the reporting person at the time he/she first elects to defer any payment under the Plan, May 31st of the year specified by the reporting person."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F2","text":"Once released, the RSUs corresponding to these DERs will become payable according to the election of payment designation that was filed by the reporting person subject to the Koppers Holdings Inc. Director Deferred Compensation Plan (the \"Plan\"). Such payment will be either lump sum or in annual installments commencing on the May 31st next following the reporting person's separation from service (as defined under the Plan) or, if later, and elected by the reporting person at the time he/she first elects to defer any payment under the Plan, May 31st of the year specified by the reporting person."}],"balance_after":173.783,"derivative":{"underlying":"Common Stock","underlying_shares":17},"source":{"system":"sec-edgar","filing":"0000950170-25-045377","document":"ownership.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1463649/000095017025045377/ownership.xml","form_type":"4"}},{"id":1328490,"issuer":{"id":5058,"kind":"organization","name":"Koppers Holdings Inc.","symbol":"KOP"},"owners":[{"id":37241,"kind":"person","name":"Feng Xudong","position":1,"cik":"0001463649","reported_name":"Feng Xudong","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Dividend Equivalent Rights","published_at":"2024-12-17T22:27:26.000Z","date":"2024-12-16","kind":"grant","planned":false,"acquired":true,"shares":20.815,"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 deferred compensation. Each DER is the economic equivalent of one share of Koppers Holdings Inc. common stock."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F2","text":"Once released, the RSUs corresponding to these DERs will become payable according to the election of payment designation that was filed by the reporting person subject to the Koppers Holdings Inc. Director Deferred Compensation Plan (the \"Plan\"). Such payment will be either lump sum or in annual installments commencing on the May 31st next following the reporting person's separation from service (as defined under the Plan) or, if later, and elected by the reporting person at the time he/she first elects to defer any payment under the Plan, May 31st of the year specified by the reporting person."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F2","text":"Once released, the RSUs corresponding to these DERs will become payable according to the election of payment designation that was filed by the reporting person subject to the Koppers Holdings Inc. Director Deferred Compensation Plan (the \"Plan\"). Such payment will be either lump sum or in annual installments commencing on the May 31st next following the reporting person's separation from service (as defined under the Plan) or, if later, and elected by the reporting person at the time he/she first elects to defer any payment under the Plan, May 31st of the year specified by the reporting person."}],"balance_after":156.783,"derivative":{"underlying":"Common Stock","underlying_shares":20.815},"source":{"system":"sec-edgar","filing":"0000950170-24-137404","document":"ownership.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1463649/000095017024137404/ownership.xml","form_type":"4"}},{"id":1403508,"issuer":{"id":5058,"kind":"organization","name":"Koppers Holdings Inc.","symbol":"KOP"},"owners":[{"id":37241,"kind":"person","name":"Feng Xudong","position":1,"cik":"0001463649","reported_name":"Feng Xudong","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Dividend Equivalent Rights","published_at":"2024-09-18T21:16:40.000Z","date":"2024-09-16","kind":"grant","planned":false,"acquired":true,"shares":18.483,"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 deferred compensation. Each DER is the economic equivalent of one share of Koppers Holdings Inc. common stock."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F2","text":"Once released, the RSUs corresponding to these DERs will become payable according to the election of payment designation that was filed by the reporting person subject to the Koppers Holdings Inc. Director Deferred Compensation Plan (the \"Plan\"). Such payment will be either lump sum or in annual installments commencing on the May 31st next following the reporting person's separation from service (as defined under the Plan) or, if later, and elected by the reporting person at the time he/she first elects to defer any payment under the Plan, May 31st of the year specified by the reporting person."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F2","text":"Once released, the RSUs corresponding to these DERs will become payable according to the election of payment designation that was filed by the reporting person subject to the Koppers Holdings Inc. Director Deferred Compensation Plan (the \"Plan\"). Such payment will be either lump sum or in annual installments commencing on the May 31st next following the reporting person's separation from service (as defined under the Plan) or, if later, and elected by the reporting person at the time he/she first elects to defer any payment under the Plan, May 31st of the year specified by the reporting person."}],"balance_after":135.968,"derivative":{"underlying":"Common Stock","underlying_shares":18.483},"source":{"system":"sec-edgar","filing":"0000950170-24-107881","document":"ownership.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1463649/000095017024107881/ownership.xml","form_type":"4"}},{"id":1481986,"issuer":{"id":5058,"kind":"organization","name":"Koppers Holdings Inc.","symbol":"KOP"},"owners":[{"id":37241,"kind":"person","name":"Feng Xudong","position":1,"cik":"0001463649","reported_name":"Feng Xudong","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Dividend Equivalent Rights","published_at":"2024-06-12T20:11:26.000Z","date":"2024-06-10","kind":"grant","planned":false,"acquired":true,"shares":16.339,"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 deferred compensation.  Each DER is the economic equivalent of one share of Koppers Holdings Inc. common stock."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F2","text":"Once released, the RSUs corresponding to these DERs will become payable according to the election of payment designation that was filed by the reporting person subject to the Koppers Holdings Inc. Director Deferred Compensation Plan (the \"Plan\"). Such payment will be either lump sum or in annual installments commencing on the May 31st next following the reporting person's separation from service (as defined under the Plan) or, if later, and elected by the reporting person at the time he/she first elects to defer any payment under the Plan, May 31st of the year specified by the reporting person."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F2","text":"Once released, the RSUs corresponding to these DERs will become payable according to the election of payment designation that was filed by the reporting person subject to the Koppers Holdings Inc. Director Deferred Compensation Plan (the \"Plan\"). Such payment will be either lump sum or in annual installments commencing on the May 31st next following the reporting person's separation from service (as defined under the Plan) or, if later, and elected by the reporting person at the time he/she first elects to defer any payment under the Plan, May 31st of the year specified by the reporting person."}],"balance_after":117.485,"derivative":{"underlying":"Common Stock","underlying_shares":16.339},"source":{"system":"sec-edgar","filing":"0000950170-24-072448","document":"ownership.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1463649/000095017024072448/ownership.xml","form_type":"4"}},{"id":1526262,"issuer":{"id":5058,"kind":"organization","name":"Koppers Holdings Inc.","symbol":"KOP"},"owners":[{"id":37241,"kind":"person","name":"Feng Xudong","position":1,"cik":"0001463649","reported_name":"Feng Xudong","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Restricted Stock Units","published_at":"2024-05-06T20:49:08.000Z","date":"2024-05-02","kind":"grant","planned":false,"acquired":true,"shares":2079,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"Restricted Stock Units (\"RSUs\") represent the right to receive shares of common stock on a one-for-one basis."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F2","text":"The RSUs become payable according to the election of payment designation that was filed by the reporting person subject to the Koppers Holdings Inc. Director Deferred Compensation Plan (the \"Plan\"). Such payment will be either lump sum or in annual installments commencing on the May 31st next following the reporting person's separation from service (as defined under the Plan) or, if later, and elected by the reporting person at the time he/she first elects to defer any payment under the Plan, May 31st of the year specified by the reporting person."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F2","text":"The RSUs become payable according to the election of payment designation that was filed by the reporting person subject to the Koppers Holdings Inc. Director Deferred Compensation Plan (the \"Plan\"). Such payment will be either lump sum or in annual installments commencing on the May 31st next following the reporting person's separation from service (as defined under the Plan) or, if later, and elected by the reporting person at the time he/she first elects to defer any payment under the Plan, May 31st of the year specified by the reporting person."}],"balance_after":11699.478,"derivative":{"underlying":"Common Stock","underlying_shares":2079},"source":{"system":"sec-edgar","filing":"0000950170-24-053636","document":"ownership.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1463649/000095017024053636/ownership.xml","form_type":"4"}},{"id":1559455,"issuer":{"id":5058,"kind":"organization","name":"Koppers Holdings Inc.","symbol":"KOP"},"owners":[{"id":37241,"kind":"person","name":"Feng Xudong","position":1,"cik":"0001463649","reported_name":"Feng Xudong","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Dividend Equivalent Rights","published_at":"2024-03-27T20:31:33.000Z","date":"2024-03-25","kind":"grant","planned":false,"acquired":true,"shares":20,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F4","text":"The DERs accrued with respect to additional RSUs credited to the reporting person with respect to RSUs granted on May 4, 2023. Each DER is the economic equivalent of one share of Koppers Holdings Inc. common stock."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F2","text":"Once released, the RSUs corresponding to these DERs will become payable according to the election of payment designation that was filed by the reporting person subject to the Koppers Holdings Inc. Director Deferred Compensation Plan (the \"Plan\"). Such payment will be either lump sum or in annual installments commencing on the May 31st next following the reporting person's separation from service (as defined under the Plan) or, if later, and elected by the reporting person at the time he/she first elects to defer any payment under the Plan, May 31st of the year specified by the reporting person."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F2","text":"Once released, the RSUs corresponding to these DERs will become payable according to the election of payment designation that was filed by the reporting person subject to the Koppers Holdings Inc. Director Deferred Compensation Plan (the \"Plan\"). Such payment will be either lump sum or in annual installments commencing on the May 31st next following the reporting person's separation from service (as defined under the Plan) or, if later, and elected by the reporting person at the time he/she first elects to defer any payment under the Plan, May 31st of the year specified by the reporting person."}],"balance_after":101.146,"derivative":{"underlying":"Common Stock","underlying_shares":20},"source":{"system":"sec-edgar","filing":"0000950170-24-037246","document":"ownership.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1463649/000095017024037246/ownership.xml","form_type":"4"}},{"id":1559454,"issuer":{"id":5058,"kind":"organization","name":"Koppers Holdings Inc.","symbol":"KOP"},"owners":[{"id":37241,"kind":"person","name":"Feng Xudong","position":1,"cik":"0001463649","reported_name":"Feng Xudong","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Dividend Equivalent Rights","published_at":"2024-03-27T20:31:33.000Z","date":"2024-03-25","kind":"grant","planned":false,"acquired":true,"shares":7.967,"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 deferred compensation. Each DER is the economic equivalent of one share of Koppers Holdings Inc. common stock."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F2","text":"Once released, the RSUs corresponding to these DERs will become payable according to the election of payment designation that was filed by the reporting person subject to the Koppers Holdings Inc. Director Deferred Compensation Plan (the \"Plan\"). Such payment will be either lump sum or in annual installments commencing on the May 31st next following the reporting person's separation from service (as defined under the Plan) or, if later, and elected by the reporting person at the time he/she first elects to defer any payment under the Plan, May 31st of the year specified by the reporting person."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F2","text":"Once released, the RSUs corresponding to these DERs will become payable according to the election of payment designation that was filed by the reporting person subject to the Koppers Holdings Inc. Director Deferred Compensation Plan (the \"Plan\"). Such payment will be either lump sum or in annual installments commencing on the May 31st next following the reporting person's separation from service (as defined under the Plan) or, if later, and elected by the reporting person at the time he/she first elects to defer any payment under the Plan, May 31st of the year specified by the reporting person."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"Includes 8.365 DERs that inadvertently were not previously reported."}],"balance_after":81.146,"derivative":{"underlying":"Common Stock","underlying_shares":7.967},"source":{"system":"sec-edgar","filing":"0000950170-24-037246","document":"ownership.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1463649/000095017024037246/ownership.xml","form_type":"4"}},{"id":1782006,"issuer":{"id":5058,"kind":"organization","name":"Koppers Holdings Inc.","symbol":"KOP"},"owners":[{"id":37241,"kind":"person","name":"Feng Xudong","position":1,"cik":"0001463649","reported_name":"Feng Xudong","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Dividend Equivalent Rights","published_at":"2023-09-13T20:31:38.000Z","date":"2023-09-11","kind":"grant","planned":false,"acquired":true,"shares":9.829,"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 deferred compensation. Each DER is the economic equivalent of one share of Koppers Holdings Inc. common stock."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F2","text":"Once released, the RSUs corresponding to these DERs will become payable according to the election of payment designation that was filed by\nthe reporting person subject to the Koppers Holdings Inc. Director Deferred Compensation Plan (the \"Plan\"). Such payment will be either lump sum or in annual installments commencing on the May 31st next following the reporting person's separation from service (as defined under the Plan) or, if later, and elected by the reporting person at the time he/she first elects to defer any payment under the Plan, May 31st of the year specified by the reporting person."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F2","text":"Once released, the RSUs corresponding to these DERs will become payable according to the election of payment designation that was filed by\nthe reporting person subject to the Koppers Holdings Inc. Director Deferred Compensation Plan (the \"Plan\"). Such payment will be either lump sum or in annual installments commencing on the May 31st next following the reporting person's separation from service (as defined under the Plan) or, if later, and elected by the reporting person at the time he/she first elects to defer any payment under the Plan, May 31st of the year specified by the reporting person."}],"balance_after":64.814,"derivative":{"underlying":"Common Stock","underlying_shares":9.829},"source":{"system":"sec-edgar","filing":"0001209191-23-049272","document":"doc4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1463649/000120919123049272/doc4.xml","form_type":"4"}},{"id":1787046,"issuer":{"id":5058,"kind":"organization","name":"Koppers Holdings Inc.","symbol":"KOP"},"owners":[{"id":37241,"kind":"person","name":"Feng Xudong","position":1,"cik":"0001463649","reported_name":"Feng Xudong","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2023-09-06T20:58:44.000Z","date":"2023-09-05","kind":"gift","planned":false,"acquired":false,"shares":3936,"price":0,"value":0.0,"ownership":{"direct":true},"balance_after":28904,"source":{"system":"sec-edgar","filing":"0001209191-23-048422","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1463649/000120919123048422/doc4.xml","form_type":"4"}},{"id":1855818,"issuer":{"id":5058,"kind":"organization","name":"Koppers Holdings Inc.","symbol":"KOP"},"owners":[{"id":37241,"kind":"person","name":"Feng Xudong","position":1,"cik":"0001463649","reported_name":"Feng Xudong","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Dividend Equivalent Rights","published_at":"2023-06-14T20:35:30.000Z","date":"2023-06-12","kind":"grant","planned":false,"acquired":true,"shares":11.191,"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 deferred compensation. Each DER is the economic equivalent of one share of Koppers Holdings Inc. common stock."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F2","text":"Once released, the RSUs corresponding to these DERs will become payable according to the election of payment designation that was filed by the reporting person subject to the Koppers Holdings Inc. Director Deferred Compensation Plan (the \"Plan\"). Such payment will be either lump sum or in annual installments commencing on the May 31st next following the reporting person's separation from service (as defined under the Plan) or, if later, and elected by the reporting person at the time he/she first elects to defer any payment under the Plan, May 31st of the year specified by the reporting person."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F2","text":"Once released, the RSUs corresponding to these DERs will become payable according to the election of payment designation that was filed by the reporting person subject to the Koppers Holdings Inc. Director Deferred Compensation Plan (the \"Plan\"). Such payment will be either lump sum or in annual installments commencing on the May 31st next following the reporting person's separation from service (as defined under the Plan) or, if later, and elected by the reporting person at the time he/she first elects to defer any payment under the Plan, May 31st of the year specified by the reporting person."}],"balance_after":54.985,"derivative":{"underlying":"Common Stock","underlying_shares":11.191},"source":{"system":"sec-edgar","filing":"0001209191-23-037044","document":"doc4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1463649/000120919123037044/doc4.xml","form_type":"4"}},{"id":1900898,"issuer":{"id":5058,"kind":"organization","name":"Koppers Holdings Inc.","symbol":"KOP"},"owners":[{"id":37241,"kind":"person","name":"Feng Xudong","position":1,"cik":"0001463649","reported_name":"Feng Xudong","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Restricted Stock Units","published_at":"2023-05-08T20:39:30.000Z","date":"2023-05-04","kind":"grant","planned":false,"acquired":true,"shares":3513,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"Restricted Stock Units (\"RSUs\") represent the right to receive shares of common stock on a one-for-one basis."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F2","text":"The Restricted Stock Units become payable according to the election of payment designation that was filed by the reporting person subject to the Koppers Holdings Inc. Director Deferred Compensation Plan (the \"Plan\"). Such payment will be either lump sum or in annual installments commencing on the May 31st next following the reporting person's separation from service (as defined under the Plan) or, if later, and elected by the reporting person at the time he/she first elects to defer any payment under the Plan, May 31st of the year specified by the reporting person."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F2","text":"The Restricted Stock Units become payable according to the election of payment designation that was filed by the reporting person subject to the Koppers Holdings Inc. Director Deferred Compensation Plan (the \"Plan\"). Such payment will be either lump sum or in annual installments commencing on the May 31st next following the reporting person's separation from service (as defined under the Plan) or, if later, and elected by the reporting person at the time he/she first elects to defer any payment under the Plan, May 31st of the year specified by the reporting person."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"Includes 4,326 RSUs that were inadvertently omitted from the total reported in this column in prior reports."}],"balance_after":9620.478,"derivative":{"underlying":"Common Stock","underlying_shares":3513},"source":{"system":"sec-edgar","filing":"0001209191-23-027956","document":"doc4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1463649/000120919123027956/doc4.xml","form_type":"4"}},{"id":1910109,"issuer":{"id":5058,"kind":"organization","name":"Koppers Holdings Inc.","symbol":"KOP"},"owners":[{"id":37241,"kind":"person","name":"Feng Xudong","position":1,"cik":"0001463649","reported_name":"Feng Xudong","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Dividend Equivalent Rights","published_at":"2023-05-01T20:40:19.000Z","date":"2023-04-27","kind":"grant","planned":false,"acquired":true,"shares":37,"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 May 5, 2022. Each DER is the economic equivalent of one share of Koppers Holdings Inc. common stock."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F2","text":"Once released, the RSUs corresponding to these DERs will become payable according to the election of payment designation that was filed by the reporting person subject to the Koppers Holdings Inc. Director Deferred Compensation Plan (the \"Plan\"). Such payment will be either lump sum or in annual installments commencing on the May 31st next following the reporting person's separation from service (as defined under the Plan) or, if later, and elected by the reporting person at the time he/she first elects to defer any payment under the Plan, May 31st of the year specified by the reporting person."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F2","text":"Once released, the RSUs corresponding to these DERs will become payable according to the election of payment designation that was filed by the reporting person subject to the Koppers Holdings Inc. Director Deferred Compensation Plan (the \"Plan\"). Such payment will be either lump sum or in annual installments commencing on the May 31st next following the reporting person's separation from service (as defined under the Plan) or, if later, and elected by the reporting person at the time he/she first elects to defer any payment under the Plan, May 31st of the year specified by the reporting person."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"Includes 6.794 DERs that inadvertently were not previously reported."}],"balance_after":43.794,"derivative":{"underlying":"Common Stock","underlying_shares":37},"source":{"system":"sec-edgar","filing":"0001209191-23-026290","document":"doc4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1463649/000120919123026290/doc4.xml","form_type":"4"}},{"id":2049595,"issuer":{"id":5058,"kind":"organization","name":"Koppers Holdings Inc.","symbol":"KOP"},"owners":[{"id":37241,"kind":"person","name":"Feng Xudong","position":1,"cik":"0001463649","reported_name":"Feng Xudong","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Restricted Stock Units","published_at":"2023-01-20T21:08:40.000Z","date":"2023-01-18","kind":"grant","acquired":true,"shares":817.2773,"price":31.66,"value":25874.999318,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"Restricted Stock Units represent the right to receive shares of common stock on a one-for-one basis."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F2","text":"The Restricted Stock Units become payable according to the election of payment designation that was filed by the reporting person subject to the Koppers Holdings Inc. Director Deferred Compensation Plan (the \"Plan\"). Such\npayment will be either lump sum or in annual installments commencing on the May 31st next following the reporting person's separation from service (as defined under the Plan) or, if later, and elected by the reporting person at the\ntime he/she first elects to defer any payment under the Plan, May 31st of the year specified by the reporting person."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F2","text":"The Restricted Stock Units become payable according to the election of payment designation that was filed by the reporting person subject to the Koppers Holdings Inc. Director Deferred Compensation Plan (the \"Plan\"). Such\npayment will be either lump sum or in annual installments commencing on the May 31st next following the reporting person's separation from service (as defined under the Plan) or, if later, and elected by the reporting person at the\ntime he/she first elects to defer any payment under the Plan, May 31st of the year specified by the reporting person."}],"balance_after":1781.4783,"derivative":{"underlying":"Common Stock","underlying_shares":817.2773},"source":{"system":"sec-edgar","filing":"0001209191-23-004230","document":"doc4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1463649/000120919123004230/doc4.xml","form_type":"4"}},{"id":2229887,"issuer":{"id":5058,"kind":"organization","name":"Koppers Holdings Inc.","symbol":"KOP"},"owners":[{"id":37241,"kind":"person","name":"Feng Xudong","position":1,"cik":"0001463649","reported_name":"Feng Xudong","relationship":{"director":true}}],"security":"Restricted Stock Units","published_at":"2022-06-16T20:08:05.000Z","date":"2022-06-15","kind":"grant","acquired":true,"shares":964.201,"price":25.28,"value":24375.00128,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"Restricted Stock Units represent the right to receive shares of common stock on a one-for-one basis."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F2","text":"The Restricted Stock Units become payable according to the election of payment designation that was filed by the reporting person subject to the Koppers Holdings Inc. Director Deferred Compensation Plan (the \"Plan\"). Such payment will be either lump sum or in annual installments commencing on the May 31st next following the reporting person's separation from service (as defined under the Plan) or, if later, and elected by the reporting person at the time he/she first elects to defer any payment under the Plan, May 31st of the year specified by the reporting person."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F2","text":"The Restricted Stock Units become payable according to the election of payment designation that was filed by the reporting person subject to the Koppers Holdings Inc. Director Deferred Compensation Plan (the \"Plan\"). Such payment will be either lump sum or in annual installments commencing on the May 31st next following the reporting person's separation from service (as defined under the Plan) or, if later, and elected by the reporting person at the time he/she first elects to defer any payment under the Plan, May 31st of the year specified by the reporting person."}],"balance_after":964.201,"derivative":{"underlying":"Common Stock","underlying_shares":964.201},"source":{"system":"sec-edgar","filing":"0001127602-22-017612","document":"form4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1463649/000112760222017612/form4.xml","form_type":"4"}},{"id":2258175,"issuer":{"id":5058,"kind":"organization","name":"Koppers Holdings Inc.","symbol":"KOP"},"owners":[{"id":37241,"kind":"person","name":"Feng Xudong","position":1,"cik":"0001463649","reported_name":"Feng Xudong","relationship":{"director":true}}],"security":"Common Stock","published_at":"2022-05-24T20:31:33.000Z","date":"2022-05-20","kind":"sale","acquired":false,"shares":2430,"price":24.37,"value":59219.1,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"The price reported in column 4 is a weighted average price.  These shares were sold in multiple transactions at prices ranging from $24.28 to $24.49, inclusive.  The reporting person undertakes to provide to the Securities and Exchange Commission, the issuer or any security holder of the issuer, upon request, full information regarding the number of shares sold at each separate price."}],"balance_after":32840,"source":{"system":"sec-edgar","filing":"0001127602-22-015448","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1463649/000112760222015448/form4.xml","form_type":"4"}},{"id":2280810,"issuer":{"id":5058,"kind":"organization","name":"Koppers Holdings Inc.","symbol":"KOP"},"owners":[{"id":37241,"kind":"person","name":"Feng Xudong","position":1,"cik":"0001463649","reported_name":"Feng Xudong","relationship":{"director":true}}],"security":"Restricted Stock Units","published_at":"2022-05-06T00:51:17.000Z","date":"2022-05-05","kind":"grant","acquired":true,"shares":4326,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"Restricted Stock Units represent the right to receive shares on a one-for-one basis."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F2","text":"The Restricted Stock Units become payable according to the election of payment designation that was filed by the reporting person subject to the Koppers Holdings Inc. Director Deferred Compensation Plan (the \"Plan\"). Such payment will be either lump sum or in annual installments commencing on the May 31st next following the reporting person's separation from service (as defined under the Plan) or, if later, and elected by the reporting person at the time he/she first elects to defer any payment under the Plan, May 31st of the year specified by the reporting person."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F2","text":"The Restricted Stock Units become payable according to the election of payment designation that was filed by the reporting person subject to the Koppers Holdings Inc. Director Deferred Compensation Plan (the \"Plan\"). Such payment will be either lump sum or in annual installments commencing on the May 31st next following the reporting person's separation from service (as defined under the Plan) or, if later, and elected by the reporting person at the time he/she first elects to defer any payment under the Plan, May 31st of the year specified by the reporting person."}],"balance_after":4326,"derivative":{"underlying":"Common Stock","underlying_shares":4326},"source":{"system":"sec-edgar","filing":"0001127602-22-013587","document":"form4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1463649/000112760222013587/form4.xml","form_type":"4"}},{"id":2723076,"issuer":{"id":5058,"kind":"organization","name":"Koppers Holdings Inc.","symbol":"KOP"},"owners":[{"id":37241,"kind":"person","name":"Feng Xudong","position":1,"cik":"0001463649","reported_name":"Feng Xudong","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2021-05-07T19:27:36.000Z","date":"2021-05-06","kind":"grant","acquired":true,"shares":3078,"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":35270,"source":{"system":"sec-edgar","filing":"0001209191-21-030842","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1463649/000120919121030842/doc4.xml","form_type":"4"}},{"id":2966037,"issuer":{"id":5058,"kind":"organization","name":"Koppers Holdings Inc.","symbol":"KOP"},"owners":[{"id":37241,"kind":"person","name":"Feng Xudong","position":1,"cik":"0001463649","reported_name":"Feng Xudong","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2020-11-25T14:21:05.000Z","date":"2020-11-23","kind":"sale","acquired":false,"shares":3752,"price":27.35,"value":102617.2,"ownership":{"direct":true},"balance_after":32192,"source":{"system":"sec-edgar","filing":"0001209191-20-060429","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1463649/000120919120060429/doc4.xml","form_type":"4"}},{"id":3157996,"issuer":{"id":5058,"kind":"organization","name":"Koppers Holdings Inc.","symbol":"KOP"},"owners":[{"id":37241,"kind":"person","name":"Feng Xudong","position":1,"cik":"0001463649","reported_name":"Feng Xudong","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2020-05-07T19:08:12.000Z","date":"2020-05-06","kind":"grant","acquired":true,"shares":8434,"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":35944,"source":{"system":"sec-edgar","filing":"0001209191-20-027614","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1463649/000120919120027614/doc4.xml","form_type":"4"}},{"id":3420503,"issuer":{"id":5058,"kind":"organization","name":"Koppers Holdings Inc.","symbol":"KOP"},"owners":[{"id":37241,"kind":"person","name":"Feng Xudong","position":1,"cik":"0001463649","reported_name":"Feng Xudong","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2019-09-06T19:56:26.000Z","date":"2019-09-05","kind":"sale","acquired":false,"shares":2442,"price":26.92,"value":65738.64,"ownership":{"direct":true},"balance_after":27510,"source":{"system":"sec-edgar","filing":"0001209191-19-048710","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1463649/000120919119048710/doc4.xml","form_type":"4"}},{"id":3537985,"issuer":{"id":5058,"kind":"organization","name":"Koppers Holdings Inc.","symbol":"KOP"},"owners":[{"id":37241,"kind":"person","name":"Feng Xudong","position":1,"cik":"0001463649","reported_name":"Feng Xudong","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2019-05-06T15:18:57.000Z","date":"2019-05-02","kind":"grant","acquired":true,"shares":3936,"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":29952,"source":{"system":"sec-edgar","filing":"0001209191-19-027611","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1463649/000120919119027611/doc4.xml","form_type":"4"}},{"id":3940888,"issuer":{"id":5058,"kind":"organization","name":"Koppers Holdings Inc.","symbol":"KOP"},"owners":[{"id":37241,"kind":"person","name":"Feng Xudong","position":1,"cik":"0001463649","reported_name":"Feng Xudong","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2018-05-09T21:27:52.000Z","date":"2018-05-08","kind":"grant","acquired":true,"shares":2430,"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":26016,"source":{"system":"sec-edgar","filing":"0001209191-18-028943","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1463649/000120919118028943/doc4.xml","form_type":"4"}},{"id":4296072,"issuer":{"id":5058,"kind":"organization","name":"Koppers Holdings Inc.","symbol":"KOP"},"owners":[{"id":37241,"kind":"person","name":"Feng Xudong","position":1,"cik":"0001463649","reported_name":"Feng Xudong","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2017-06-02T15:00:10.000Z","date":"2017-05-10","kind":"grant","acquired":true,"shares":2442,"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":23586,"source":{"system":"sec-edgar","filing":"0001209191-17-037030","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1463649/000120919117037030/doc4.xml","form_type":"4"}}]}