{"transactions":[{"id":779928,"issuer":{"id":5387,"kind":"organization","name":"DELCATH SYSTEMS, INC.","symbol":"DCTH"},"owners":[{"id":47462,"kind":"person","name":"Sylvester John Richard","position":1,"cik":"0001784561","reported_name":"Sylvester John Richard","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Stock Option (right to buy)","published_at":"2026-05-14T21:47:20.000Z","date":"2026-05-13","kind":"grant","planned":false,"acquired":true,"shares":22500,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"The option will vest and become exercisable at the rate of one-twelfth (1/12th) per month with the first such vesting to occur on May 13, 2026 and monthly thereafter for so long as the reporting person remains a director of  the Issuer (and subject to the terms and conditions of the Issuer's 2020 Omnibus Equity Incentive Plan, as amended). The option will expire the earlier of 10 years from the grant date or, for vested options, two years from the last day of service."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F1","text":"The option will vest and become exercisable at the rate of one-twelfth (1/12th) per month with the first such vesting to occur on May 13, 2026 and monthly thereafter for so long as the reporting person remains a director of  the Issuer (and subject to the terms and conditions of the Issuer's 2020 Omnibus Equity Incentive Plan, as amended). The option will expire the earlier of 10 years from the grant date or, for vested options, two years from the last day of service."}],"balance_after":22500,"derivative":{"exercise_price":11.61,"underlying":"Common Stock","underlying_shares":22500},"source":{"system":"sec-edgar","filing":"0001784561-26-000003","document":"form4-05142026_090516.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/872912/000178456126000003/form4-05142026_090516.xml","form_type":"4"}},{"id":989335,"issuer":{"id":5387,"kind":"organization","name":"DELCATH SYSTEMS, INC.","symbol":"DCTH"},"owners":[{"id":47462,"kind":"person","name":"Sylvester John Richard","position":1,"cik":"0001784561","reported_name":"Sylvester John Richard","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2025-11-25T21:15:07.000Z","date":"2025-11-21","kind":"purchase","planned":false,"acquired":true,"shares":4386,"price":8.89,"value":38991.54,"ownership":{"direct":true},"balance_after":14936,"source":{"system":"sec-edgar","filing":"0001784561-25-000005","document":"form4-11252025_041104.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/872912/000178456125000005/form4-11252025_041104.xml","form_type":"4"}},{"id":1143974,"issuer":{"id":5387,"kind":"organization","name":"DELCATH SYSTEMS, INC.","symbol":"DCTH"},"owners":[{"id":47462,"kind":"person","name":"Sylvester John Richard","position":1,"cik":"0001784561","reported_name":"Sylvester John Richard","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Stock Option (right to buy)","published_at":"2025-05-19T20:10:16.000Z","date":"2025-05-15","kind":"grant","planned":false,"acquired":true,"shares":22500,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"The option will vest and become exercisable at the rate of one-twelfth (1/12th) per month with the first such vesting to occur on May 15, 2025 and monthly thereafter for so long as the reporting person remains a director of  the Issuer (and subject to the terms and conditions of the Issuer's 2020 Omnibus Equity Incentive Plan, as amended). The option will expire the earlier of 10 years from the grant date or, for vested options, two years from the last day of service."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F1","text":"The option will vest and become exercisable at the rate of one-twelfth (1/12th) per month with the first such vesting to occur on May 15, 2025 and monthly thereafter for so long as the reporting person remains a director of  the Issuer (and subject to the terms and conditions of the Issuer's 2020 Omnibus Equity Incentive Plan, as amended). The option will expire the earlier of 10 years from the grant date or, for vested options, two years from the last day of service."}],"balance_after":22500,"derivative":{"exercise_price":16.05,"underlying":"Common Stock","underlying_shares":22500},"source":{"system":"sec-edgar","filing":"0001415889-25-013616","document":"form4-05192025_040512.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/872912/000141588925013616/form4-05192025_040512.xml","form_type":"4"}},{"id":1501080,"issuer":{"id":5387,"kind":"organization","name":"DELCATH SYSTEMS, INC.","symbol":"DCTH"},"owners":[{"id":47462,"kind":"person","name":"Sylvester John Richard","position":1,"cik":"0001784561","reported_name":"Sylvester John Richard","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Stock Option (right to buy)","published_at":"2024-05-28T20:31:38.000Z","date":"2024-05-23","kind":"grant","planned":false,"acquired":true,"shares":22500,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"The option will vest and become exercisable at the rate of one-twelfth (1/12th) per month with the first such vesting to occur on May 23, 2024 and monthly thereafter for so long as the reporting person remains a director of Delcath Systems, Inc. (and subject to the terms and conditions of the Delcath Systems, Inc. 2020 Omnibus Equity Incentive Plan, as amended). The option will expire the earlier of 10 years from the grant date or, for vested options, two years from the last day of service."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F1","text":"The option will vest and become exercisable at the rate of one-twelfth (1/12th) per month with the first such vesting to occur on May 23, 2024 and monthly thereafter for so long as the reporting person remains a director of Delcath Systems, Inc. (and subject to the terms and conditions of the Delcath Systems, Inc. 2020 Omnibus Equity Incentive Plan, as amended). The option will expire the earlier of 10 years from the grant date or, for vested options, two years from the last day of service."}],"balance_after":22500,"derivative":{"exercise_price":7.85,"underlying":"Common Stock","underlying_shares":22500},"source":{"system":"sec-edgar","filing":"0001415889-24-014677","document":"form4-05282024_080534.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/872912/000141588924014677/form4-05282024_080534.xml","form_type":"4"}},{"id":1799044,"issuer":{"id":5387,"kind":"organization","name":"DELCATH SYSTEMS, INC.","symbol":"DCTH"},"owners":[{"id":47462,"kind":"person","name":"Sylvester John Richard","position":1,"cik":"0001784561","reported_name":"Sylvester John Richard","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2023-08-23T15:03:55.000Z","date":"2023-08-21","kind":"purchase","planned":false,"acquired":true,"shares":10550,"price":4.8,"value":50640.0,"ownership":{"direct":true},"balance_after":10550,"source":{"system":"sec-edgar","filing":"0001209191-23-046988","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/872912/000120919123046988/doc4.xml","form_type":"4"}},{"id":1847212,"issuer":{"id":5387,"kind":"organization","name":"DELCATH SYSTEMS, INC.","symbol":"DCTH"},"owners":[{"id":47462,"kind":"person","name":"Sylvester John Richard","position":1,"cik":"0001784561","reported_name":"Sylvester John Richard","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Stock Option (Right to Buy)","published_at":"2023-06-22T20:32:36.000Z","date":"2023-06-12","kind":"grant","planned":false,"acquired":true,"shares":19682,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"The option will vest and become exercisable at the rate of one-twelfth (1/12th) per month with the first such vesting to occur on July 12, 2023 and monthly thereafter for so long as the reporting person remains a director of Delcath Systems, Inc. (and subject to the terms and conditions of the Delcath Systems, Inc. 2020 Omnibus Equity Incentive Plan, as amended)."}],"balance_after":19682,"derivative":{"exercise_price":7.25,"expiration_date":"2033-06-12","underlying":"Common Stock","underlying_shares":19682},"source":{"system":"sec-edgar","filing":"0000899243-23-016249","document":"doc4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/872912/000089924323016249/doc4.xml","form_type":"4"}},{"id":2279886,"issuer":{"id":5387,"kind":"organization","name":"DELCATH SYSTEMS, INC.","symbol":"DCTH"},"owners":[{"id":47462,"kind":"person","name":"Sylvester John Richard","position":1,"cik":"0001784561","reported_name":"Sylvester John Richard","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Stock Option (Right to Buy)","published_at":"2022-05-06T17:42:02.000Z","date":"2022-05-04","kind":"grant","acquired":true,"shares":9000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"The option will vest and become exercisable at the rate of one-twelfth (1/12th) per month on the first day of each month, with the first such vesting to occur on June 1, 2022 and monthly thereafter for so long as the reporting person remains a director of Delcath Systems, Inc. The option is subject to the terms and conditions of the Delcath Systems, Inc. 2020 Omnibus Equity Incentive Plan, as amended."}],"balance_after":9000,"derivative":{"exercise_price":6.24,"expiration_date":"2023-05-04","underlying":"Common Stock","underlying_shares":9000},"source":{"system":"sec-edgar","filing":"0000899243-22-017038","document":"doc4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/872912/000089924322017038/doc4.xml","form_type":"4"}},{"id":2610868,"issuer":{"id":5387,"kind":"organization","name":"DELCATH SYSTEMS, INC.","symbol":"DCTH"},"owners":[{"id":47462,"kind":"person","name":"Sylvester John Richard","position":1,"cik":"0001784561","reported_name":"Sylvester John Richard","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Stock Option (right to buy)","published_at":"2021-08-09T20:35:27.000Z","date":"2021-08-05","kind":"grant","acquired":true,"shares":9000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"The option immediately vested with respect to four-twelfths (4/12ths) of the option shares and the remaining option shares will vest and become exercisable at the rate of one-twelfth (1/12th) per month on the first day of each month for the next eight months, starting on September 1, 2021, for so long as the reporting person remains a director of Delcath Systems, Inc. (and subject to the terms and conditions of the Delcath Systems, Inc. 2020 Omnibus Equity Incentive Plan)."}],"balance_after":9000,"derivative":{"exercise_price":10.16,"expiration_date":"2031-08-05","underlying":"Common   Stock","underlying_shares":9000},"source":{"system":"sec-edgar","filing":"0000899243-21-032162","document":"doc4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/872912/000089924321032162/doc4.xml","form_type":"4"}},{"id":2966922,"issuer":{"id":5387,"kind":"organization","name":"DELCATH SYSTEMS, INC.","symbol":"DCTH"},"owners":[{"id":47462,"kind":"person","name":"Sylvester John Richard","position":1,"cik":"0001784561","reported_name":"Sylvester John Richard","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Stock Option (right to buy)","published_at":"2020-11-25T22:59:35.000Z","date":"2020-11-23","kind":"grant","acquired":true,"shares":30000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"date","element":"transactionDate","label":"F1","text":"The stock option was awarded on October 1, 2020 pursuant to the terms and conditions of the Delcath Systems, Inc. 2020 Omnibus Equity Incentive Plan (the \"Plan\"), subject to shareholder approval of the Plan. The Plan was approved by the stockholders of Delcath Systems, Inc. (the \"Company\") on November 23, 2020."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F2","text":"The option vests ratably over the 36-month period beginning on October 1, 2020, provided that the reporting person remains a director of the Company as of each such vesting date. The option is exercisable immediately upon vesting."}],"balance_after":30000,"derivative":{"exercise_price":11.67,"expiration_date":"2030-10-01","underlying":"Common Stock","underlying_shares":30000},"source":{"system":"sec-edgar","filing":"0000899243-20-032198","document":"doc4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/872912/000089924320032198/doc4.xml","form_type":"4"}}]}