{"transactions":[{"id":2011,"issuer":{"id":1599,"kind":"organization","name":"FUEL TECH, INC.","symbol":"FTEK"},"owners":[{"id":1600,"kind":"person","name":"Nuggihalli Ramesh","position":1,"cik":"0001855199","reported_name":"Nuggihalli Ramesh","relationship":{"officer":true,"officer_title":"President & CEO"}}],"security":"Common Stock","published_at":"2026-09-03T20:06:05.000Z","date":"2026-09-01","kind":"purchase","planned":false,"acquired":true,"shares":1470.529,"price":1.36,"value":1999.91944,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"The price reported in Column 4 is a weighted average share price. The shares were purchased in multiple transactions for an average price of $1.360. The reporting person undertakes to provide to any security holder of Fuel Tech, Inc. or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the range set forth in this footnote."}],"balance_after":1470.529,"source":{"system":"sec-edgar","filing":"0001437749-26-029608","document":"rdgdoc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1855199/000143774926029608/rdgdoc.xml","form_type":"4"}},{"id":748768,"issuer":{"id":1599,"kind":"organization","name":"FUEL TECH, INC.","symbol":"FTEK"},"owners":[{"id":41127,"kind":"person","name":"BAILEY DOUGLAS G","position":1,"cik":"0001246268","reported_name":"BAILEY DOUGLAS G","relationship":{"director":true}}],"security":"Restricted Stock Units","published_at":"2026-06-05T20:12:26.000Z","date":"2026-06-04","kind":"grant","planned":false,"acquired":true,"shares":15000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"Each Restricted Stock Unit represents a contingent right to receive one stock of FTEK Common Stock. The grant of the Restricted Stock Units was approved by the non-employee directors of the Compensation Committee of Fuel Tech, Inc. on June 3, 2026."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F2","text":"The Restricted Stock Units vest on the one-year anniversary after the transaction date shown above."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F2","text":"The Restricted Stock Units vest on the one-year anniversary after the transaction date shown above."}],"balance_after":15000,"derivative":{"underlying":"Common Stock","underlying_shares":15000},"source":{"system":"sec-edgar","filing":"0001437749-26-019745","document":"rdgdoc.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/846913/000143774926019745/rdgdoc.xml","form_type":"4"}},{"id":748769,"issuer":{"id":1599,"kind":"organization","name":"FUEL TECH, INC.","symbol":"FTEK"},"owners":[{"id":41128,"kind":"person","name":"Jones Sharon L","position":1,"cik":"0001734963","reported_name":"Jones Sharon L","relationship":{"director":true}}],"security":"Restricted Stock Units","published_at":"2026-06-05T20:12:07.000Z","date":"2026-06-04","kind":"grant","planned":false,"acquired":true,"shares":15000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"Each Restricted Stock Unit represents a contingent right to receive one stock of FTEK Common Stock. The grant of the Restricted Stock Units was approved by the non-employee directors of the Compensation Committee of Fuel Tech, Inc. on June 3, 2026."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F2","text":"The Restricted Stock Units vest on the one-year anniversary after the transaction date shown above."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F2","text":"The Restricted Stock Units vest on the one-year anniversary after the transaction date shown above."}],"balance_after":15000,"derivative":{"underlying":"Common Stock","underlying_shares":15000},"source":{"system":"sec-edgar","filing":"0001437749-26-019744","document":"rdgdoc.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/846913/000143774926019744/rdgdoc.xml","form_type":"4"}},{"id":748767,"issuer":{"id":1599,"kind":"organization","name":"FUEL TECH, INC.","symbol":"FTEK"},"owners":[{"id":41126,"kind":"person","name":"ZEITLER DENNIS L","position":1,"cik":"0001118164","reported_name":"ZEITLER DENNIS L","relationship":{"director":true}}],"security":"Restricted Stock Units","published_at":"2026-06-05T20:11:51.000Z","date":"2026-06-04","kind":"grant","planned":false,"acquired":true,"shares":15000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"Each Restricted Stock Unit represents a contingent right to receive one stock of FTEK Common Stock. The grant of the Restricted Stock Units was approved by the non-employee directors of the Compensation Committee of Fuel Tech, Inc. on June 3, 2026."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F2","text":"The Restricted Stock Units vest on the one-year anniversary after the transaction date shown above."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F2","text":"The Restricted Stock Units vest on the one-year anniversary after the transaction date shown above."}],"balance_after":15000,"derivative":{"underlying":"Common Stock","underlying_shares":15000},"source":{"system":"sec-edgar","filing":"0001437749-26-019743","document":"rdgdoc.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/846913/000143774926019743/rdgdoc.xml","form_type":"4"}},{"id":826858,"issuer":{"id":1599,"kind":"organization","name":"FUEL TECH, INC.","symbol":"FTEK"},"owners":[{"id":55704,"kind":"person","name":"Albrecht Ellen T","position":1,"cik":"0001382971","reported_name":"Albrecht Ellen T","relationship":{"officer":true,"officer_title":"Chief Financial Officer"}}],"security":"Restricted Stock Units","published_at":"2026-03-27T20:03:30.000Z","date":"2026-03-24","kind":"grant","planned":false,"acquired":true,"shares":8350,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"Each Restricted Stock Unit represents a contingent right to receive one stock of FTEK Common Stock."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F2","text":"The Restricted Stock Units vest in three installments: (i) one-third of the total RSUs awarded shall vest on the one year anniversary after the transaction date shown above, (ii) one-third shall vest on the second anniversary of the transaction date shown above, and (iii) one-third shall vest on the third anniversary of the transaction date shown above. Subject to the restrictions on distribution set forth in the registrant's RSU Award Agreement, generally, shares will be delivered to the reporting person in respect of vested RSUs as soon as practicable after each vesting date, unless the reporting person has elected to defer distribution until a later date."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F2","text":"The Restricted Stock Units vest in three installments: (i) one-third of the total RSUs awarded shall vest on the one year anniversary after the transaction date shown above, (ii) one-third shall vest on the second anniversary of the transaction date shown above, and (iii) one-third shall vest on the third anniversary of the transaction date shown above. Subject to the restrictions on distribution set forth in the registrant's RSU Award Agreement, generally, shares will be delivered to the reporting person in respect of vested RSUs as soon as practicable after each vesting date, unless the reporting person has elected to defer distribution until a later date."}],"balance_after":8350,"derivative":{"underlying":"Common Stock","underlying_shares":8350},"source":{"system":"sec-edgar","filing":"0001437749-26-010082","document":"rdgdoc.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/846913/000143774926010082/rdgdoc.xml","form_type":"4"}},{"id":826857,"issuer":{"id":1599,"kind":"organization","name":"FUEL TECH, INC.","symbol":"FTEK"},"owners":[{"id":55703,"kind":"person","name":"ARNONE VINCENT J","position":1,"cik":"0001272727","reported_name":"ARNONE VINCENT J","relationship":{"director":true,"officer":true,"officer_title":"President & CEO"}}],"security":"Restricted Stock Units","published_at":"2026-03-27T20:03:07.000Z","date":"2026-03-24","kind":"grant","planned":false,"acquired":true,"shares":20850,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"Each Restricted Stock Unit represents a contingent right to receive one stock of FTEK Common Stock."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F2","text":"The Restricted Stock Units vest in three installments: (i) one-third of the total RSUs awarded shall vest on the one year anniversary after the transaction date shown above, (ii) one-third shall vest on the second anniversary of the transaction date shown above, and (iii) one-third shall vest on the third anniversary of the transaction date shown above. Subject to the restrictions on distribution set forth in the registrant's RSU Award Agreement, generally, shares will be delivered to the reporting person in respect of vested RSUs as soon as practicable after each vesting date, unless the reporting person has elected to defer distribution until a later date."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F2","text":"The Restricted Stock Units vest in three installments: (i) one-third of the total RSUs awarded shall vest on the one year anniversary after the transaction date shown above, (ii) one-third shall vest on the second anniversary of the transaction date shown above, and (iii) one-third shall vest on the third anniversary of the transaction date shown above. Subject to the restrictions on distribution set forth in the registrant's RSU Award Agreement, generally, shares will be delivered to the reporting person in respect of vested RSUs as soon as practicable after each vesting date, unless the reporting person has elected to defer distribution until a later date."}],"balance_after":20850,"derivative":{"underlying":"Common Stock","underlying_shares":20850},"source":{"system":"sec-edgar","filing":"0001437749-26-010081","document":"rdgdoc.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/846913/000143774926010081/rdgdoc.xml","form_type":"4"}},{"id":826856,"issuer":{"id":1599,"kind":"organization","name":"FUEL TECH, INC.","symbol":"FTEK"},"owners":[{"id":55702,"kind":"person","name":"Cummings William E JR","position":1,"cik":"0001358637","reported_name":"Cummings William E JR","relationship":{"officer":true,"officer_title":"Senior Vice President, Sales"}}],"security":"Restricted Stock Units","published_at":"2026-03-27T20:02:37.000Z","date":"2026-03-24","kind":"grant","planned":false,"acquired":true,"shares":6250,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"Each Restricted Stock Unit represents a contingent right to receive one stock of FTEK Common Stock."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F2","text":"The Restricted Stock Units vest in three installments: (i) one-third of the total RSUs awarded shall vest on the one year anniversary after the transaction date shown above, (ii) one-third shall vest on the second anniversary of the transaction date shown above, and (iii) one-third shall vest on the third anniversary of the transaction date shown above. Subject to the restrictions on distribution set forth in the registrant's RSU Award Agreement, generally, shares will be delivered to the reporting person in respect of vested RSUs as soon as practicable after each vesting date, unless the reporting person has elected to defer distribution until a later date."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F2","text":"The Restricted Stock Units vest in three installments: (i) one-third of the total RSUs awarded shall vest on the one year anniversary after the transaction date shown above, (ii) one-third shall vest on the second anniversary of the transaction date shown above, and (iii) one-third shall vest on the third anniversary of the transaction date shown above. Subject to the restrictions on distribution set forth in the registrant's RSU Award Agreement, generally, shares will be delivered to the reporting person in respect of vested RSUs as soon as practicable after each vesting date, unless the reporting person has elected to defer distribution until a later date."}],"balance_after":6250,"derivative":{"underlying":"Common Stock","underlying_shares":6250},"source":{"system":"sec-edgar","filing":"0001437749-26-010080","document":"rdgdoc.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/846913/000143774926010080/rdgdoc.xml","form_type":"4"}},{"id":854876,"issuer":{"id":1599,"kind":"organization","name":"FUEL TECH, INC.","symbol":"FTEK"},"owners":[{"id":55703,"kind":"person","name":"ARNONE VINCENT J","position":1,"cik":"0001272727","reported_name":"ARNONE VINCENT J","relationship":{"director":true,"officer":true,"officer_title":"President & CEO"}}],"security":"Common Stock","published_at":"2026-03-09T20:05:14.000Z","date":"2026-03-06","kind":"purchase","planned":false,"acquired":true,"shares":10000,"price":1.24,"value":12400.0,"ownership":{"direct":true},"balance_after":549513,"source":{"system":"sec-edgar","filing":"0001437749-26-007356","document":"rdgdoc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/846913/000143774926007356/rdgdoc.xml","form_type":"4"}},{"id":1120453,"issuer":{"id":1599,"kind":"organization","name":"FUEL TECH, INC.","symbol":"FTEK"},"owners":[{"id":41127,"kind":"person","name":"BAILEY DOUGLAS G","position":1,"cik":"0001246268","reported_name":"BAILEY DOUGLAS G","relationship":{"director":true}}],"security":"Restricted Stock Units","published_at":"2025-06-06T20:11:01.000Z","date":"2025-06-04","kind":"grant","planned":false,"acquired":true,"shares":15000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"Each Restricted Stock Unit represents a contingent right to receive one stock of FTEK Common Stock. The grant of the Restricted Stock Units was approved by the non-employee directors of the Compensation Committee of Fuel Tech, Inc. on June 4, 2025."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F2","text":"The Restricted Stock Units vest on the one-year anniversary after the transaction date shown above."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F2","text":"The Restricted Stock Units vest on the one-year anniversary after the transaction date shown above."}],"balance_after":15000,"derivative":{"underlying":"Common Stock","underlying_shares":15000},"source":{"system":"sec-edgar","filing":"0001437749-25-019724","document":"rdgdoc.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/846913/000143774925019724/rdgdoc.xml","form_type":"4"}},{"id":1120452,"issuer":{"id":1599,"kind":"organization","name":"FUEL TECH, INC.","symbol":"FTEK"},"owners":[{"id":41128,"kind":"person","name":"Jones Sharon L","position":1,"cik":"0001734963","reported_name":"Jones Sharon L","relationship":{"director":true}}],"security":"Restricted Stock Units","published_at":"2025-06-06T20:10:28.000Z","date":"2025-06-04","kind":"grant","planned":false,"acquired":true,"shares":15000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"Each Restricted Stock Unit represents a contingent right to receive one stock of FTEK Common Stock. The grant of the Restricted Stock Units was approved by the non-employee directors of the Compensation Committee of Fuel Tech, Inc. on June 4, 2025."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F2","text":"The Restricted Stock Units vest on the one-year anniversary after the transaction date shown above."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F2","text":"The Restricted Stock Units vest on the one-year anniversary after the transaction date shown above."}],"balance_after":15000,"derivative":{"underlying":"Common Stock","underlying_shares":15000},"source":{"system":"sec-edgar","filing":"0001437749-25-019722","document":"rdgdoc.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/846913/000143774925019722/rdgdoc.xml","form_type":"4"}},{"id":1120451,"issuer":{"id":1599,"kind":"organization","name":"FUEL TECH, INC.","symbol":"FTEK"},"owners":[{"id":41128,"kind":"person","name":"Jones Sharon L","position":1,"cik":"0001734963","reported_name":"Jones Sharon L","relationship":{"director":true}}],"security":"Common Stock","published_at":"2025-06-06T20:10:28.000Z","date":"2025-06-04","kind":"sale","planned":false,"acquired":false,"shares":12627,"price":1.6665,"value":21042.8955,"ownership":{"direct":true},"balance_after":83972.565,"source":{"system":"sec-edgar","filing":"0001437749-25-019722","document":"rdgdoc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/846913/000143774925019722/rdgdoc.xml","form_type":"4"}},{"id":1120450,"issuer":{"id":1599,"kind":"organization","name":"FUEL TECH, INC.","symbol":"FTEK"},"owners":[{"id":41126,"kind":"person","name":"ZEITLER DENNIS L","position":1,"cik":"0001118164","reported_name":"ZEITLER DENNIS L","relationship":{"director":true}}],"security":"Restricted Stock Units","published_at":"2025-06-06T20:09:39.000Z","date":"2025-06-04","kind":"grant","planned":false,"acquired":true,"shares":15000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"Each Restricted Stock Unit represents a contingent right to receive one stock of FTEK Common Stock. The grant of the Restricted Stock Units was approved by the non-employee directors of the Compensation Committee of Fuel Tech, Inc. on June 4, 2025."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F2","text":"The Restricted Stock Units vest on the one-year anniversary after the transaction date shown above."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F2","text":"The Restricted Stock Units vest on the one-year anniversary after the transaction date shown above."}],"balance_after":15000,"derivative":{"underlying":"Common Stock","underlying_shares":15000},"source":{"system":"sec-edgar","filing":"0001437749-25-019721","document":"rdgdoc.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/846913/000143774925019721/rdgdoc.xml","form_type":"4"}},{"id":1187272,"issuer":{"id":1599,"kind":"organization","name":"FUEL TECH, INC.","symbol":"FTEK"},"owners":[{"id":55703,"kind":"person","name":"ARNONE VINCENT J","position":1,"cik":"0001272727","reported_name":"ARNONE VINCENT J","relationship":{"director":true,"officer":true,"officer_title":"President & CEO"}}],"security":"Common Stock","published_at":"2025-04-01T20:03:47.000Z","date":"2025-03-28","kind":"purchase","planned":false,"acquired":true,"shares":15000,"price":1.05,"value":15750.0,"ownership":{"direct":true},"balance_after":485879,"source":{"system":"sec-edgar","filing":"0001437749-25-010449","document":"rdgdoc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/846913/000143774925010449/rdgdoc.xml","form_type":"4"}},{"id":1357861,"issuer":{"id":1599,"kind":"organization","name":"FUEL TECH, INC.","symbol":"FTEK"},"owners":[{"id":41128,"kind":"person","name":"Jones Sharon L","position":1,"cik":"0001734963","reported_name":"Jones Sharon L","relationship":{"director":true}}],"security":"Common Stock","published_at":"2024-11-20T21:02:26.000Z","date":"2024-11-19","kind":"purchase","planned":false,"acquired":true,"shares":8014.4,"price":1.08,"value":8655.552,"ownership":{"direct":true},"balance_after":96599.565,"source":{"system":"sec-edgar","filing":"0001437749-24-035859","document":"rdgdoc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/846913/000143774924035859/rdgdoc.xml","form_type":"4"}},{"id":1360448,"issuer":{"id":1599,"kind":"organization","name":"FUEL TECH, INC.","symbol":"FTEK"},"owners":[{"id":41128,"kind":"person","name":"Jones Sharon L","position":1,"cik":"0001734963","reported_name":"Jones Sharon L","relationship":{"director":true}}],"security":"Common Stock","published_at":"2024-11-19T21:03:42.000Z","date":"2024-11-18","kind":"purchase","planned":false,"acquired":true,"shares":9800,"price":1.05,"value":10290.0,"ownership":{"direct":true},"balance_after":88585.165,"source":{"system":"sec-edgar","filing":"0001437749-24-035732","document":"rdgdoc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/846913/000143774924035732/rdgdoc.xml","form_type":"4"}},{"id":1360447,"issuer":{"id":1599,"kind":"organization","name":"FUEL TECH, INC.","symbol":"FTEK"},"owners":[{"id":41128,"kind":"person","name":"Jones Sharon L","position":1,"cik":"0001734963","reported_name":"Jones Sharon L","relationship":{"director":true}}],"security":"Common Stock","published_at":"2024-11-19T21:03:42.000Z","date":"2024-11-15","kind":"purchase","planned":false,"acquired":true,"shares":4200,"price":1.05,"value":4410.0,"ownership":{"direct":true},"balance_after":78785.165,"source":{"system":"sec-edgar","filing":"0001437749-24-035732","document":"rdgdoc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/846913/000143774924035732/rdgdoc.xml","form_type":"4"}},{"id":1362699,"issuer":{"id":1599,"kind":"organization","name":"FUEL TECH, INC.","symbol":"FTEK"},"owners":[{"id":41128,"kind":"person","name":"Jones Sharon L","position":1,"cik":"0001734963","reported_name":"Jones Sharon L","relationship":{"director":true}}],"security":"Common Stock","published_at":"2024-11-18T11:13:53.000Z","date":"2024-11-14","kind":"purchase","planned":false,"acquired":true,"shares":7200,"price":1.04,"value":7488.0,"ownership":{"direct":true},"balance_after":74585.165,"source":{"system":"sec-edgar","filing":"0001437749-24-035532","document":"rdgdoc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/846913/000143774924035532/rdgdoc.xml","form_type":"4"}},{"id":1362698,"issuer":{"id":1599,"kind":"organization","name":"FUEL TECH, INC.","symbol":"FTEK"},"owners":[{"id":41128,"kind":"person","name":"Jones Sharon L","position":1,"cik":"0001734963","reported_name":"Jones Sharon L","relationship":{"director":true}}],"security":"Common Stock","published_at":"2024-11-18T11:13:53.000Z","date":"2024-11-13","kind":"purchase","planned":false,"acquired":true,"shares":9100,"price":1.05,"value":9555.0,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F2","text":"The price reported in Column 4 is a weighted average share price. The shares were purchased in multiple transactions for an average price of $1.05. The reporting person undertakes to provide to any security holder of Fuel Tech, Inc. or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the range set forth in this footnote."}],"balance_after":67385.165,"source":{"system":"sec-edgar","filing":"0001437749-24-035532","document":"rdgdoc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/846913/000143774924035532/rdgdoc.xml","form_type":"4"}},{"id":1362697,"issuer":{"id":1599,"kind":"organization","name":"FUEL TECH, INC.","symbol":"FTEK"},"owners":[{"id":41128,"kind":"person","name":"Jones Sharon L","position":1,"cik":"0001734963","reported_name":"Jones Sharon L","relationship":{"director":true}}],"security":"Common Stock","published_at":"2024-11-18T11:13:53.000Z","date":"2024-11-12","kind":"purchase","planned":false,"acquired":true,"shares":9500,"price":1.02,"value":9690.0,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"The price reported in Column 4 is a weighted average share price. The shares were purchased in multiple transactions for an average price of $1.02. The reporting person undertakes to provide to any security holder of Fuel Tech, Inc. or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the range set forth in this footnote."}],"balance_after":58285.165,"source":{"system":"sec-edgar","filing":"0001437749-24-035532","document":"rdgdoc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/846913/000143774924035532/rdgdoc.xml","form_type":"4"}},{"id":1407171,"issuer":{"id":1599,"kind":"organization","name":"FUEL TECH, INC.","symbol":"FTEK"},"owners":[{"id":55704,"kind":"person","name":"Albrecht Ellen T","position":1,"cik":"0001382971","reported_name":"Albrecht Ellen T","relationship":{"officer":true,"officer_title":"Chief Financial Officer"}}],"security":"Common Stock","published_at":"2024-09-16T10:08:43.000Z","date":"2024-09-12","kind":"purchase","planned":false,"acquired":true,"shares":5000,"price":1.01,"value":5050.0,"ownership":{"direct":true},"balance_after":91684,"source":{"system":"sec-edgar","filing":"0001437749-24-029190","document":"rdgdoc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/846913/000143774924029190/rdgdoc.xml","form_type":"4"}},{"id":1407170,"issuer":{"id":1599,"kind":"organization","name":"FUEL TECH, INC.","symbol":"FTEK"},"owners":[{"id":55703,"kind":"person","name":"ARNONE VINCENT J","position":1,"cik":"0001272727","reported_name":"ARNONE VINCENT J","relationship":{"director":true,"officer":true,"officer_title":"President & CEO"}}],"security":"Common Stock","published_at":"2024-09-16T10:06:38.000Z","date":"2024-09-12","kind":"purchase","planned":false,"acquired":true,"shares":20000,"price":1.02,"value":20400.0,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"The price reported in Column 4 is a weighted average share price. The shares were purchased in multiple transactions for an average price of $1.02. The reporting person undertakes to provide to any security holder of Fuel Tech, Inc. or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the range set forth in this footnote."}],"balance_after":460513,"source":{"system":"sec-edgar","filing":"0001437749-24-029188","document":"rdgdoc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/846913/000143774924029188/rdgdoc.xml","form_type":"4"}},{"id":1419415,"issuer":{"id":1599,"kind":"organization","name":"FUEL TECH, INC.","symbol":"FTEK"},"owners":[{"id":41128,"kind":"person","name":"Jones Sharon L","position":1,"cik":"0001734963","reported_name":"Jones Sharon L","relationship":{"director":true}}],"security":"Common Stock","published_at":"2024-08-30T20:04:56.000Z","date":"2024-08-28","kind":"purchase","planned":false,"acquired":true,"shares":3293,"price":1.005,"value":3309.465,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"The price reported in Column 4 is a weighted average share price. The shares were purchased in multiple transactions for an average price of $1.005. The reporting person undertakes to provide to any security holder of Fuel Tech, Inc. or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the range set forth in this footnote."}],"balance_after":48785.165,"source":{"system":"sec-edgar","filing":"0001437749-24-028131","document":"rdgdoc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/846913/000143774924028131/rdgdoc.xml","form_type":"4"}},{"id":1426966,"issuer":{"id":1599,"kind":"organization","name":"FUEL TECH, INC.","symbol":"FTEK"},"owners":[{"id":41128,"kind":"person","name":"Jones Sharon L","position":1,"cik":"0001734963","reported_name":"Jones Sharon L","relationship":{"director":true}}],"security":"Common Stock","published_at":"2024-08-21T20:06:02.000Z","date":"2024-08-12","kind":"purchase","planned":false,"acquired":true,"shares":447.165,"price":1.005,"value":449.400825,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"The price reported in Column 4 is a weighted average share price. The shares were purchased in multiple transactions for an average price of $1.005. The reporting person undertakes to provide to any security holder of Fuel Tech, Inc. or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the range set forth in this footnote."}],"balance_after":45492.165,"source":{"system":"sec-edgar","filing":"0001437749-24-027476","document":"rdgdoc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/846913/000143774924027476/rdgdoc.xml","form_type":"4"}},{"id":1436398,"issuer":{"id":1599,"kind":"organization","name":"FUEL TECH, INC.","symbol":"FTEK"},"owners":[{"id":55703,"kind":"person","name":"ARNONE VINCENT J","position":1,"cik":"0001272727","reported_name":"ARNONE VINCENT J","relationship":{"director":true,"officer":true,"officer_title":"President & CEO"}}],"security":"Common Stock","published_at":"2024-08-12T11:23:38.000Z","date":"2024-08-09","kind":"purchase","planned":false,"acquired":true,"shares":20000,"price":1.0448,"value":20896.0,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"The price reported in Column 4 is a weighted average share price. The shares were purchased in multiple transactions for an average price of $1.044803. The reporting person undertakes to provide to any security holder of Fuel Tech, Inc. or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the range set forth in this footnote."}],"balance_after":440513,"source":{"system":"sec-edgar","filing":"0001437749-24-025946","document":"rdgdoc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/846913/000143774924025946/rdgdoc.xml","form_type":"4"}},{"id":1487682,"issuer":{"id":1599,"kind":"organization","name":"FUEL TECH, INC.","symbol":"FTEK"},"owners":[{"id":41127,"kind":"person","name":"BAILEY DOUGLAS G","position":1,"cik":"0001246268","reported_name":"BAILEY DOUGLAS G","relationship":{"director":true}}],"security":"Restricted Stock Units","published_at":"2024-06-07T20:08:24.000Z","date":"2024-06-05","kind":"grant","planned":false,"acquired":true,"shares":15000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"Each Restricted Stock Unit represents a contingent right to receive one stock of FTEK Common Stock."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F2","text":"The Restricted Stock Units vest on the one-year anniversary after the transaction date shown above."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F2","text":"The Restricted Stock Units vest on the one-year anniversary after the transaction date shown above."}],"balance_after":15000,"derivative":{"underlying":"Common Stock","underlying_shares":15000},"source":{"system":"sec-edgar","filing":"0001437749-24-019657","document":"rdgdoc.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/846913/000143774924019657/rdgdoc.xml","form_type":"4"}},{"id":1487681,"issuer":{"id":1599,"kind":"organization","name":"FUEL TECH, INC.","symbol":"FTEK"},"owners":[{"id":41128,"kind":"person","name":"Jones Sharon L","position":1,"cik":"0001734963","reported_name":"Jones Sharon L","relationship":{"director":true}}],"security":"Restricted Stock Units","published_at":"2024-06-07T20:08:06.000Z","date":"2024-06-05","kind":"grant","planned":false,"acquired":true,"shares":15000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"Each Restricted Stock Unit represents a contingent right to receive one stock of FTEK Common Stock."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F2","text":"The Restricted Stock Units vest on the one-year anniversary after the transaction date shown above."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F2","text":"The Restricted Stock Units vest on the one-year anniversary after the transaction date shown above."}],"balance_after":15000,"derivative":{"underlying":"Common Stock","underlying_shares":15000},"source":{"system":"sec-edgar","filing":"0001437749-24-019656","document":"rdgdoc.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/846913/000143774924019656/rdgdoc.xml","form_type":"4"}},{"id":1487680,"issuer":{"id":1599,"kind":"organization","name":"FUEL TECH, INC.","symbol":"FTEK"},"owners":[{"id":41126,"kind":"person","name":"ZEITLER DENNIS L","position":1,"cik":"0001118164","reported_name":"ZEITLER DENNIS L","relationship":{"director":true}}],"security":"Restricted Stock Units","published_at":"2024-06-07T20:07:45.000Z","date":"2024-06-05","kind":"grant","planned":false,"acquired":true,"shares":15000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"Each Restricted Stock Unit represents a contingent right to receive one stock of FTEK Common Stock."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F2","text":"The Restricted Stock Units vest on the one-year anniversary after the transaction date shown above."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F2","text":"The Restricted Stock Units vest on the one-year anniversary after the transaction date shown above."}],"balance_after":15000,"derivative":{"underlying":"Common Stock","underlying_shares":15000},"source":{"system":"sec-edgar","filing":"0001437749-24-019655","document":"rdgdoc.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/846913/000143774924019655/rdgdoc.xml","form_type":"4"}},{"id":1604866,"issuer":{"id":1599,"kind":"organization","name":"FUEL TECH, INC.","symbol":"FTEK"},"owners":[{"id":55704,"kind":"person","name":"Albrecht Ellen T","position":1,"cik":"0001382971","reported_name":"Albrecht Ellen T","relationship":{"officer":true,"officer_title":"Chief Financial Officer"}}],"security":"Restricted Stock Units","published_at":"2024-03-04T21:06:12.000Z","date":"2024-02-29","kind":"grant","planned":false,"acquired":true,"shares":12500,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"Each Restricted Stock Unit represents a contingent right to receive one stock of FTEK Common Stock."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F2","text":"The Restricted Stock Units vest in three installments: (i) one-third of the total RSUs awarded shall vest on the one year anniversary after the transaction date shown above, (ii) one-third shall vest on the second anniversary of the transaction date shown above, and (iii) one-third shall vest on the third anniversary of the transaction date shown above. Subject to the restrictions on distribution set forth in the registrant's RSU Award Agreement, generally, shares will be delivered to the reporting person in respect of vested RSUs as soon as practicable after each vesting date, unless the reporting person has elected to defer distribution until a later date."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F2","text":"The Restricted Stock Units vest in three installments: (i) one-third of the total RSUs awarded shall vest on the one year anniversary after the transaction date shown above, (ii) one-third shall vest on the second anniversary of the transaction date shown above, and (iii) one-third shall vest on the third anniversary of the transaction date shown above. Subject to the restrictions on distribution set forth in the registrant's RSU Award Agreement, generally, shares will be delivered to the reporting person in respect of vested RSUs as soon as practicable after each vesting date, unless the reporting person has elected to defer distribution until a later date."}],"balance_after":12500,"derivative":{"underlying":"Common Stock","underlying_shares":12500},"source":{"system":"sec-edgar","filing":"0001437749-24-006420","document":"rdgdoc.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/846913/000143774924006420/rdgdoc.xml","form_type":"4"}},{"id":1604865,"issuer":{"id":1599,"kind":"organization","name":"FUEL TECH, INC.","symbol":"FTEK"},"owners":[{"id":55703,"kind":"person","name":"ARNONE VINCENT J","position":1,"cik":"0001272727","reported_name":"ARNONE VINCENT J","relationship":{"director":true,"officer":true,"officer_title":"President & CEO"}}],"security":"Restricted Stock Units","published_at":"2024-03-04T21:04:49.000Z","date":"2024-02-29","kind":"grant","planned":false,"acquired":true,"shares":31100,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"Each Restricted Stock Unit represents a contingent right to receive one stock of FTEK Common Stock."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F2","text":"The Restricted Stock Units vest in three installments: (i) one-third of the total RSUs awarded shall vest on the one year anniversary after the transaction date shown above, (ii) one-third shall vest on the second anniversary of the transaction date shown above, and (iii) one-third shall vest on the third anniversary of the transaction date shown above. Subject to the restrictions on distribution set forth in the registrant's RSU Award Agreement, generally, shares will be delivered to the reporting person in respect of vested RSUs as soon as practicable after each vesting date, unless the reporting person has elected to defer distribution until a later date."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F2","text":"The Restricted Stock Units vest in three installments: (i) one-third of the total RSUs awarded shall vest on the one year anniversary after the transaction date shown above, (ii) one-third shall vest on the second anniversary of the transaction date shown above, and (iii) one-third shall vest on the third anniversary of the transaction date shown above. Subject to the restrictions on distribution set forth in the registrant's RSU Award Agreement, generally, shares will be delivered to the reporting person in respect of vested RSUs as soon as practicable after each vesting date, unless the reporting person has elected to defer distribution until a later date."}],"balance_after":31100,"derivative":{"underlying":"Common Stock","underlying_shares":31100},"source":{"system":"sec-edgar","filing":"0001437749-24-006418","document":"rdgdoc.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/846913/000143774924006418/rdgdoc.xml","form_type":"4"}},{"id":1604864,"issuer":{"id":1599,"kind":"organization","name":"FUEL TECH, INC.","symbol":"FTEK"},"owners":[{"id":55702,"kind":"person","name":"Cummings William E JR","position":1,"cik":"0001358637","reported_name":"Cummings William E JR","relationship":{"officer":true,"officer_title":"Senior Vice President, Sales"}}],"security":"Restricted Stock Units","published_at":"2024-03-04T21:02:35.000Z","date":"2024-02-29","kind":"grant","planned":false,"acquired":true,"shares":9400,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"Each Restricted Stock Unit represents a contingent right to receive one stock of FTEK Common Stock."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F2","text":"The Restricted Stock Units vest in three installments: (i) one-third of the total RSUs awarded shall vest on the one year anniversary after the transaction date shown above, (ii) one-third shall vest on the second anniversary of the transaction date shown above, and (iii) one-third shall vest on the third anniversary of the transaction date shown above. Subject to the restrictions on distribution set forth in the registrant's RSU Award Agreement, generally, shares will be delivered to the reporting person in respect of vested RSUs as soon as practicable after each vesting date, unless the reporting person has elected to defer distribution until a later date."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F2","text":"The Restricted Stock Units vest in three installments: (i) one-third of the total RSUs awarded shall vest on the one year anniversary after the transaction date shown above, (ii) one-third shall vest on the second anniversary of the transaction date shown above, and (iii) one-third shall vest on the third anniversary of the transaction date shown above. Subject to the restrictions on distribution set forth in the registrant's RSU Award Agreement, generally, shares will be delivered to the reporting person in respect of vested RSUs as soon as practicable after each vesting date, unless the reporting person has elected to defer distribution until a later date."}],"balance_after":9400,"derivative":{"underlying":"Common Stock","underlying_shares":9400},"source":{"system":"sec-edgar","filing":"0001437749-24-006417","document":"rdgdoc.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/846913/000143774924006417/rdgdoc.xml","form_type":"4"}},{"id":1809167,"issuer":{"id":1599,"kind":"organization","name":"FUEL TECH, INC.","symbol":"FTEK"},"owners":[{"id":55703,"kind":"person","name":"ARNONE VINCENT J","position":1,"cik":"0001272727","reported_name":"ARNONE VINCENT J","relationship":{"director":true,"officer":true,"officer_title":"President & CEO"}}],"security":"Common Stock","published_at":"2023-08-14T20:02:22.000Z","date":"2023-08-11","kind":"purchase","planned":false,"acquired":true,"shares":15000,"price":1.199,"value":17985.0,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"The price reported in Column 4 is a weighted average share price. The shares were purchased in multiple transactions at prices ranging from $1.19 to $1.20, inclusive. The reporting person undertakes to provide to any security holder of Fuel Tech, Inc. or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the range set forth in this footnote."}],"balance_after":344755,"source":{"system":"sec-edgar","filing":"0001437749-23-023655","document":"rdgdoc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/846913/000143774923023655/rdgdoc.xml","form_type":"4"}},{"id":1861381,"issuer":{"id":1599,"kind":"organization","name":"FUEL TECH, INC.","symbol":"FTEK"},"owners":[{"id":41127,"kind":"person","name":"BAILEY DOUGLAS G","position":1,"cik":"0001246268","reported_name":"BAILEY DOUGLAS G","relationship":{"director":true}}],"security":"Restricted Stock Units","published_at":"2023-06-09T20:05:30.000Z","date":"2023-06-07","kind":"grant","planned":false,"acquired":true,"shares":15000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"Each Restricted Stock Unit represents a contingent right to receive one stock of FTEK Common Stock."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F2","text":"The Restricted Stock Units vest on the one-year anniversary after the transaction date shown above."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F2","text":"The Restricted Stock Units vest on the one-year anniversary after the transaction date shown above."}],"balance_after":15000,"derivative":{"underlying":"Common Stock","underlying_shares":15000},"source":{"system":"sec-edgar","filing":"0001437749-23-017056","document":"rdgdoc.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/846913/000143774923017056/rdgdoc.xml","form_type":"4"}},{"id":1861380,"issuer":{"id":1599,"kind":"organization","name":"FUEL TECH, INC.","symbol":"FTEK"},"owners":[{"id":41128,"kind":"person","name":"Jones Sharon L","position":1,"cik":"0001734963","reported_name":"Jones Sharon L","relationship":{"director":true}}],"security":"Restricted Stock Units","published_at":"2023-06-09T20:04:39.000Z","date":"2023-06-07","kind":"grant","planned":false,"acquired":true,"shares":15000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"Each Restricted Stock Unit represents a contingent right to receive one stock of FTEK Common Stock."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F2","text":"The Restricted Stock Units vest on the one-year anniversary after the transaction date shown above."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F2","text":"The Restricted Stock Units vest on the one-year anniversary after the transaction date shown above."}],"balance_after":15000,"derivative":{"underlying":"Common Stock","underlying_shares":15000},"source":{"system":"sec-edgar","filing":"0001437749-23-017055","document":"rdgdoc.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/846913/000143774923017055/rdgdoc.xml","form_type":"4"}},{"id":1861379,"issuer":{"id":1599,"kind":"organization","name":"FUEL TECH, INC.","symbol":"FTEK"},"owners":[{"id":41126,"kind":"person","name":"ZEITLER DENNIS L","position":1,"cik":"0001118164","reported_name":"ZEITLER DENNIS L","relationship":{"director":true}}],"security":"Restricted Stock Units","published_at":"2023-06-09T20:03:36.000Z","date":"2023-06-07","kind":"grant","planned":false,"acquired":true,"shares":15000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"Each Restricted Stock Unit represents a contingent right to receive one stock of FTEK Common Stock."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F2","text":"The Restricted Stock Units vest on the one-year anniversary after the transaction date shown above."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F2","text":"The Restricted Stock Units vest on the one-year anniversary after the transaction date shown above."}],"balance_after":15000,"derivative":{"underlying":"Common Stock","underlying_shares":15000},"source":{"system":"sec-edgar","filing":"0001437749-23-017054","document":"rdgdoc.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/846913/000143774923017054/rdgdoc.xml","form_type":"4"}},{"id":2243155,"issuer":{"id":1599,"kind":"organization","name":"FUEL TECH, INC.","symbol":"FTEK"},"owners":[{"id":55703,"kind":"person","name":"ARNONE VINCENT J","position":1,"cik":"0001272727","reported_name":"ARNONE VINCENT J","relationship":{"director":true,"officer":true,"officer_title":"President & CEO"}}],"security":"Restricted Stock Units","published_at":"2022-06-06T20:07:31.000Z","date":"2022-06-02","kind":"grant","acquired":true,"shares":151515,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"Each Restricted Stock Unit represents a contingent right to receive one stock of FTEK Common Stock."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F2","text":"The Restricted Stock Units vest in two installments: (i) one half of the total RSUs awarded shall vest on the second anniversary after the transaction date shown above, and (ii) the final one half shall vest on the third anniversary of the transaction date shown above. Subject to the restrictions on distribution set forth in the registrant's RSU Award Agreement, generally, shares will be delivered to the reporting person in respect of vested RSUs as soon as practicable after each vesting date, unless the reporting person has elected to defer distribution until a later date."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F2","text":"The Restricted Stock Units vest in two installments: (i) one half of the total RSUs awarded shall vest on the second anniversary after the transaction date shown above, and (ii) the final one half shall vest on the third anniversary of the transaction date shown above. Subject to the restrictions on distribution set forth in the registrant's RSU Award Agreement, generally, shares will be delivered to the reporting person in respect of vested RSUs as soon as practicable after each vesting date, unless the reporting person has elected to defer distribution until a later date."}],"balance_after":151515,"derivative":{"underlying":"Common Stock","underlying_shares":151515},"source":{"system":"sec-edgar","filing":"0001437749-22-014396","document":"rdgdoc.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/846913/000143774922014396/rdgdoc.xml","form_type":"4"}},{"id":2243154,"issuer":{"id":1599,"kind":"organization","name":"FUEL TECH, INC.","symbol":"FTEK"},"owners":[{"id":41127,"kind":"person","name":"BAILEY DOUGLAS G","position":1,"cik":"0001246268","reported_name":"BAILEY DOUGLAS G","relationship":{"director":true}}],"security":"Restricted Stock Units","published_at":"2022-06-06T20:06:53.000Z","date":"2022-06-02","kind":"grant","acquired":true,"shares":15000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"Each Restricted Stock Unit represents a contingent right to receive one stock of FTEK Common Stock."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F2","text":"The Restricted Stock Units vest on the one-year anniversary after the transaction date shown above."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F2","text":"The Restricted Stock Units vest on the one-year anniversary after the transaction date shown above."}],"balance_after":15000,"derivative":{"underlying":"Common Stock","underlying_shares":15000},"source":{"system":"sec-edgar","filing":"0001437749-22-014395","document":"rdgdoc.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/846913/000143774922014395/rdgdoc.xml","form_type":"4"}},{"id":2243153,"issuer":{"id":1599,"kind":"organization","name":"FUEL TECH, INC.","symbol":"FTEK"},"owners":[{"id":55702,"kind":"person","name":"Cummings William E JR","position":1,"cik":"0001358637","reported_name":"Cummings William E JR","relationship":{"officer":true,"officer_title":"Senior Vice President, Sales"}}],"security":"Restricted Stock Units","published_at":"2022-06-06T20:06:21.000Z","date":"2022-06-02","kind":"grant","acquired":true,"shares":64394,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"Each Restricted Stock Unit represents a contingent right to receive one stock of FTEK Common Stock."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F2","text":"The Restricted Stock Units vest in two installments: (i) one half of the total RSUs awarded shall vest on the second anniversary after the transaction date shown above, and (ii) the final one half shall vest on the third anniversary of the transaction date shown above. Subject to the restrictions on distribution set forth in the registrant's RSU Award Agreement, generally, shares will be delivered to the reporting person in respect of vested RSUs as soon as practicable after each vesting date, unless the reporting person has elected to defer distribution until a later date."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F2","text":"The Restricted Stock Units vest in two installments: (i) one half of the total RSUs awarded shall vest on the second anniversary after the transaction date shown above, and (ii) the final one half shall vest on the third anniversary of the transaction date shown above. Subject to the restrictions on distribution set forth in the registrant's RSU Award Agreement, generally, shares will be delivered to the reporting person in respect of vested RSUs as soon as practicable after each vesting date, unless the reporting person has elected to defer distribution until a later date."}],"balance_after":64394,"derivative":{"underlying":"Common Stock","underlying_shares":64394},"source":{"system":"sec-edgar","filing":"0001437749-22-014394","document":"rdgdoc.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/846913/000143774922014394/rdgdoc.xml","form_type":"4"}},{"id":2243152,"issuer":{"id":1599,"kind":"organization","name":"FUEL TECH, INC.","symbol":"FTEK"},"owners":[{"id":41128,"kind":"person","name":"Jones Sharon L","position":1,"cik":"0001734963","reported_name":"Jones Sharon L","relationship":{"director":true}}],"security":"Restricted Stock Units","published_at":"2022-06-06T20:05:49.000Z","date":"2022-06-02","kind":"grant","acquired":true,"shares":15000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"Each Restricted Stock Unit represents a contingent right to receive one stock of FTEK Common Stock."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F2","text":"The Restricted Stock Units vest on the one-year anniversary after the transaction date shown above."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F2","text":"The Restricted Stock Units vest on the one-year anniversary after the transaction date shown above."}],"balance_after":15000,"derivative":{"underlying":"Common Stock","underlying_shares":15000},"source":{"system":"sec-edgar","filing":"0001437749-22-014393","document":"rdgdoc.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/846913/000143774922014393/rdgdoc.xml","form_type":"4"}},{"id":2243150,"issuer":{"id":1599,"kind":"organization","name":"FUEL TECH, INC.","symbol":"FTEK"},"owners":[{"id":41126,"kind":"person","name":"ZEITLER DENNIS L","position":1,"cik":"0001118164","reported_name":"ZEITLER DENNIS L","relationship":{"director":true}}],"security":"Restricted Stock Units","published_at":"2022-06-06T20:05:13.000Z","date":"2022-06-02","kind":"grant","acquired":true,"shares":15000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"Each Restricted Stock Unit represents a contingent right to receive one stock of FTEK Common Stock."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F2","text":"The Restricted Stock Units vest on the one-year anniversary after the transaction date shown above."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F2","text":"The Restricted Stock Units vest on the one-year anniversary after the transaction date shown above."}],"balance_after":15000,"derivative":{"underlying":"Common Stock","underlying_shares":15000},"source":{"system":"sec-edgar","filing":"0001437749-22-014392","document":"rdgdoc.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/846913/000143774922014392/rdgdoc.xml","form_type":"4"}},{"id":2243146,"issuer":{"id":1599,"kind":"organization","name":"FUEL TECH, INC.","symbol":"FTEK"},"owners":[{"id":55704,"kind":"person","name":"Albrecht Ellen T","position":1,"cik":"0001382971","reported_name":"Albrecht Ellen T","relationship":{"officer":true,"officer_title":"Chief Financial Officer"}}],"security":"Restricted Stock Units","published_at":"2022-06-06T20:04:23.000Z","date":"2022-06-02","kind":"grant","acquired":true,"shares":75758,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"Each Restricted Stock Unit represents a contingent right to receive one stock of FTEK Common Stock."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F2","text":"The Restricted Stock Units vest in two installments: (i) one half of the total RSUs awarded shall vest on the second anniversary after the transaction date shown above, and (ii) the final one half shall vest on the third anniversary of the transaction date shown above. Subject to the restrictions on distribution set forth in the registrant's RSU Award Agreement, generally, shares will be delivered to the reporting person in respect of vested RSUs as soon as practicable after each vesting date, unless the reporting person has elected to defer distribution until a later date."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F2","text":"The Restricted Stock Units vest in two installments: (i) one half of the total RSUs awarded shall vest on the second anniversary after the transaction date shown above, and (ii) the final one half shall vest on the third anniversary of the transaction date shown above. Subject to the restrictions on distribution set forth in the registrant's RSU Award Agreement, generally, shares will be delivered to the reporting person in respect of vested RSUs as soon as practicable after each vesting date, unless the reporting person has elected to defer distribution until a later date."}],"balance_after":75758,"derivative":{"underlying":"Common Stock","underlying_shares":75758},"source":{"system":"sec-edgar","filing":"0001437749-22-014391","document":"rdgdoc.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/846913/000143774922014391/rdgdoc.xml","form_type":"4"}},{"id":2264658,"issuer":{"id":1599,"kind":"organization","name":"FUEL TECH, INC.","symbol":"FTEK"},"owners":[{"id":55703,"kind":"person","name":"ARNONE VINCENT J","position":1,"cik":"0001272727","reported_name":"ARNONE VINCENT J","relationship":{"director":true,"officer":true,"officer_title":"President & CEO"}}],"security":"Common Stock","published_at":"2022-05-19T20:30:48.000Z","date":"2022-05-17","kind":"purchase","acquired":true,"shares":20000,"price":1.1999,"value":23998.0,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"The price reported in Column 4 is a weighted average share price. The shares were purchased in multiple transactions at prices ranging from $1.199781 to $1.20, inclusive. The reporting person undertakes to provide to any security holder of Fuel Tech, Inc. or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the range set forth in this footnote."}],"balance_after":329755,"source":{"system":"sec-edgar","filing":"0001437749-22-013066","document":"rdgdoc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/846913/000143774922013066/rdgdoc.xml","form_type":"4"}},{"id":2926706,"issuer":{"id":1599,"kind":"organization","name":"FUEL TECH, INC.","symbol":"FTEK"},"owners":[{"id":144252,"kind":"person","name":"BAILEY BETTYE J","position":1,"cik":"0001671745","reported_name":"BAILEY BETTYE J","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2021-01-04T20:09:30.000Z","date":"2020-12-31","kind":"sale","acquired":false,"shares":42711,"price":4.0104,"value":171288.1944,"ownership":{"direct":true},"balance_after":4244234,"source":{"system":"sec-edgar","filing":"0001472375-21-000001","document":"primary_doc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/846913/000147237521000001/primary_doc.xml","form_type":"4"}},{"id":2930530,"issuer":{"id":1599,"kind":"organization","name":"FUEL TECH, INC.","symbol":"FTEK"},"owners":[{"id":41126,"kind":"person","name":"ZEITLER DENNIS L","position":1,"cik":"0001118164","reported_name":"ZEITLER DENNIS L","relationship":{"director":true}}],"security":"Stock Option (Right to Buy)","published_at":"2020-12-29T21:31:45.000Z","date":"2020-12-23","kind":"exercise","acquired":false,"shares":27000,"price":0,"value":0.0,"ownership":{"direct":true},"balance_after":133627,"derivative":{"exercise_price":1.58,"exercise_date":"2016-05-20","expiration_date":"2026-05-20","underlying":"Common","underlying_shares":27000},"source":{"system":"sec-edgar","filing":"0001437749-20-026057","document":"rdgdoc.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":5,"url":"https://www.sec.gov/Archives/edgar/data/846913/000143774920026057/rdgdoc.xml","form_type":"4"}},{"id":2930529,"issuer":{"id":1599,"kind":"organization","name":"FUEL TECH, INC.","symbol":"FTEK"},"owners":[{"id":41126,"kind":"person","name":"ZEITLER DENNIS L","position":1,"cik":"0001118164","reported_name":"ZEITLER DENNIS L","relationship":{"director":true}}],"security":"Stock Option (Right to Buy)","published_at":"2020-12-29T21:31:45.000Z","date":"2020-12-23","kind":"exercise","acquired":false,"shares":44000,"price":0,"value":0.0,"ownership":{"direct":true},"balance_after":106627,"derivative":{"exercise_price":0.965,"exercise_date":"2017-12-07","expiration_date":"2027-12-07","underlying":"Common","underlying_shares":44000},"source":{"system":"sec-edgar","filing":"0001437749-20-026057","document":"rdgdoc.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/846913/000143774920026057/rdgdoc.xml","form_type":"4"}},{"id":2930528,"issuer":{"id":1599,"kind":"organization","name":"FUEL TECH, INC.","symbol":"FTEK"},"owners":[{"id":41126,"kind":"person","name":"ZEITLER DENNIS L","position":1,"cik":"0001118164","reported_name":"ZEITLER DENNIS L","relationship":{"director":true}}],"security":"Common Stock","published_at":"2020-12-29T21:31:45.000Z","date":"2020-12-23","kind":"sale","acquired":false,"shares":71000,"price":4.918,"value":349178.0,"ownership":{"direct":true},"balance_after":62627,"source":{"system":"sec-edgar","filing":"0001437749-20-026057","document":"rdgdoc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/846913/000143774920026057/rdgdoc.xml","form_type":"4"}},{"id":2930527,"issuer":{"id":1599,"kind":"organization","name":"FUEL TECH, INC.","symbol":"FTEK"},"owners":[{"id":41126,"kind":"person","name":"ZEITLER DENNIS L","position":1,"cik":"0001118164","reported_name":"ZEITLER DENNIS L","relationship":{"director":true}}],"security":"Common Stock","published_at":"2020-12-29T21:31:45.000Z","date":"2020-12-23","kind":"exercise","acquired":true,"shares":27000,"price":1.58,"value":42660.0,"ownership":{"direct":true},"balance_after":133627,"source":{"system":"sec-edgar","filing":"0001437749-20-026057","document":"rdgdoc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/846913/000143774920026057/rdgdoc.xml","form_type":"4"}},{"id":2930526,"issuer":{"id":1599,"kind":"organization","name":"FUEL TECH, INC.","symbol":"FTEK"},"owners":[{"id":41126,"kind":"person","name":"ZEITLER DENNIS L","position":1,"cik":"0001118164","reported_name":"ZEITLER DENNIS L","relationship":{"director":true}}],"security":"Common Stock","published_at":"2020-12-29T21:31:45.000Z","date":"2020-12-23","kind":"exercise","acquired":true,"shares":44000,"price":0.965,"value":42460.0,"ownership":{"direct":true},"balance_after":106627,"source":{"system":"sec-edgar","filing":"0001437749-20-026057","document":"rdgdoc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/846913/000143774920026057/rdgdoc.xml","form_type":"4"}},{"id":2932050,"issuer":{"id":1599,"kind":"organization","name":"FUEL TECH, INC.","symbol":"FTEK"},"owners":[{"id":55703,"kind":"person","name":"ARNONE VINCENT J","position":1,"cik":"0001272727","reported_name":"ARNONE VINCENT J","relationship":{"director":true,"officer":true,"officer_title":"President & CEO"}}],"security":"Common Stock","published_at":"2020-12-28T22:01:18.000Z","date":"2020-12-23","kind":"sale","acquired":false,"shares":75000,"price":5.013,"value":375975.0,"ownership":{"direct":true},"balance_after":309755,"source":{"system":"sec-edgar","filing":"0001437749-20-025978","document":"rdgdoc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/846913/000143774920025978/rdgdoc.xml","form_type":"4"}},{"id":2932049,"issuer":{"id":1599,"kind":"organization","name":"FUEL TECH, INC.","symbol":"FTEK"},"owners":[{"id":55703,"kind":"person","name":"ARNONE VINCENT J","position":1,"cik":"0001272727","reported_name":"ARNONE VINCENT J","relationship":{"director":true,"officer":true,"officer_title":"President & CEO"}}],"security":"Common Stock","published_at":"2020-12-28T22:01:18.000Z","date":"2020-12-22","kind":"sale","acquired":false,"shares":125000,"price":4.248,"value":531000.0,"ownership":{"direct":true},"balance_after":384755,"source":{"system":"sec-edgar","filing":"0001437749-20-025978","document":"rdgdoc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/846913/000143774920025978/rdgdoc.xml","form_type":"4"}},{"id":2932045,"issuer":{"id":1599,"kind":"organization","name":"FUEL TECH, INC.","symbol":"FTEK"},"owners":[{"id":55704,"kind":"person","name":"Albrecht Ellen T","position":1,"cik":"0001382971","reported_name":"Albrecht Ellen T","relationship":{"officer":true,"officer_title":"Acting PFO and Treasurer"}}],"security":"Common Stock","published_at":"2020-12-28T22:00:51.000Z","date":"2020-12-23","kind":"sale","acquired":false,"shares":41900,"price":5,"value":209500.0,"ownership":{"direct":true},"balance_after":38805,"source":{"system":"sec-edgar","filing":"0001437749-20-025977","document":"rdgdoc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/846913/000143774920025977/rdgdoc.xml","form_type":"4"}},{"id":2932044,"issuer":{"id":1599,"kind":"organization","name":"FUEL TECH, INC.","symbol":"FTEK"},"owners":[{"id":55704,"kind":"person","name":"Albrecht Ellen T","position":1,"cik":"0001382971","reported_name":"Albrecht Ellen T","relationship":{"officer":true,"officer_title":"Acting PFO and Treasurer"}}],"security":"Common Stock","published_at":"2020-12-28T22:00:51.000Z","date":"2020-12-22","kind":"sale","acquired":false,"shares":30000,"price":4.26,"value":127800.0,"ownership":{"direct":true},"balance_after":80705,"source":{"system":"sec-edgar","filing":"0001437749-20-025977","document":"rdgdoc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/846913/000143774920025977/rdgdoc.xml","form_type":"4"}},{"id":2957171,"issuer":{"id":1599,"kind":"organization","name":"FUEL TECH, INC.","symbol":"FTEK"},"owners":[{"id":144893,"kind":"person","name":"Markowsky James J","position":1,"cik":"0001698347","reported_name":"Markowsky James J","relationship":{"director":true}}],"security":"Common Stock","published_at":"2020-12-04T21:50:23.000Z","date":"2020-12-02","kind":"sale","acquired":false,"shares":30000,"price":3.37,"value":101100.0,"ownership":{"direct":true},"balance_after":0,"source":{"system":"sec-edgar","filing":"0001437749-20-024851","document":"rdgdoc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/846913/000143774920024851/rdgdoc.xml","form_type":"4"}},{"id":2957170,"issuer":{"id":1599,"kind":"organization","name":"FUEL TECH, INC.","symbol":"FTEK"},"owners":[{"id":144893,"kind":"person","name":"Markowsky James J","position":1,"cik":"0001698347","reported_name":"Markowsky James J","relationship":{"director":true}}],"security":"Common Stock","published_at":"2020-12-04T21:50:23.000Z","date":"2020-12-02","kind":"sale","acquired":false,"shares":20000,"price":3.44,"value":68800.0,"ownership":{"direct":true},"balance_after":30000,"source":{"system":"sec-edgar","filing":"0001437749-20-024851","document":"rdgdoc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/846913/000143774920024851/rdgdoc.xml","form_type":"4"}},{"id":2964826,"issuer":{"id":1599,"kind":"organization","name":"FUEL TECH, INC.","symbol":"FTEK"},"owners":[{"id":144252,"kind":"person","name":"BAILEY BETTYE J","position":1,"cik":"0001671745","reported_name":"BAILEY BETTYE J","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2020-11-30T19:20:31.000Z","date":"2020-11-25","kind":"sale","acquired":false,"shares":42028,"price":4.7399,"value":199208.5172,"ownership":{"direct":true},"balance_after":4286945,"source":{"system":"sec-edgar","filing":"0001472375-20-000064","document":"primary_doc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/846913/000147237520000064/primary_doc.xml","form_type":"4"}},{"id":2965480,"issuer":{"id":1599,"kind":"organization","name":"FUEL TECH, INC.","symbol":"FTEK"},"owners":[{"id":41127,"kind":"person","name":"BAILEY DOUGLAS G","position":1,"cik":"0001246268","reported_name":"BAILEY DOUGLAS G","relationship":{"director":true}}],"security":"Common Stock","published_at":"2020-11-27T19:32:40.000Z","date":"2020-11-25","kind":"sale","acquired":false,"shares":60400,"price":5.375,"value":324650.0,"ownership":{"direct":true},"balance_after":1788161,"source":{"system":"sec-edgar","filing":"0001437749-20-024517","document":"rdgdoc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/846913/000143774920024517/rdgdoc.xml","form_type":"4"}},{"id":2965479,"issuer":{"id":1599,"kind":"organization","name":"FUEL TECH, INC.","symbol":"FTEK"},"owners":[{"id":41127,"kind":"person","name":"BAILEY DOUGLAS G","position":1,"cik":"0001246268","reported_name":"BAILEY DOUGLAS G","relationship":{"director":true}}],"security":"Common Stock","published_at":"2020-11-27T19:32:40.000Z","date":"2020-11-24","kind":"sale","acquired":false,"shares":76944,"price":5.839,"value":449276.016,"ownership":{"direct":true},"balance_after":1848561,"source":{"system":"sec-edgar","filing":"0001437749-20-024517","document":"rdgdoc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/846913/000143774920024517/rdgdoc.xml","form_type":"4"}},{"id":2965478,"issuer":{"id":1599,"kind":"organization","name":"FUEL TECH, INC.","symbol":"FTEK"},"owners":[{"id":144893,"kind":"person","name":"Markowsky James J","position":1,"cik":"0001698347","reported_name":"Markowsky James J","relationship":{"director":true}}],"security":"Stock Option (Right to Buy)","published_at":"2020-11-27T19:32:29.000Z","date":"2020-11-24","kind":"exercise","acquired":false,"shares":44000,"price":0,"value":0.0,"ownership":{"direct":true},"balance_after":44000,"derivative":{"exercise_price":0.965,"exercise_date":"2017-12-07","expiration_date":"2027-12-07","underlying":"Common Stock","underlying_shares":44000},"source":{"system":"sec-edgar","filing":"0001437749-20-024516","document":"rdgdoc.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/846913/000143774920024516/rdgdoc.xml","form_type":"4"}},{"id":2965477,"issuer":{"id":1599,"kind":"organization","name":"FUEL TECH, INC.","symbol":"FTEK"},"owners":[{"id":144893,"kind":"person","name":"Markowsky James J","position":1,"cik":"0001698347","reported_name":"Markowsky James J","relationship":{"director":true}}],"security":"Common Stock","published_at":"2020-11-27T19:32:29.000Z","date":"2020-11-24","kind":"sale","acquired":false,"shares":44000,"price":5.64,"value":248160.0,"ownership":{"direct":true},"balance_after":50000,"source":{"system":"sec-edgar","filing":"0001437749-20-024516","document":"rdgdoc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/846913/000143774920024516/rdgdoc.xml","form_type":"4"}},{"id":2965476,"issuer":{"id":1599,"kind":"organization","name":"FUEL TECH, INC.","symbol":"FTEK"},"owners":[{"id":144893,"kind":"person","name":"Markowsky James J","position":1,"cik":"0001698347","reported_name":"Markowsky James J","relationship":{"director":true}}],"security":"Common Stock","published_at":"2020-11-27T19:32:29.000Z","date":"2020-11-24","kind":"sale","acquired":false,"shares":12627,"price":6.1,"value":77024.7,"ownership":{"direct":true},"balance_after":94000,"source":{"system":"sec-edgar","filing":"0001437749-20-024516","document":"rdgdoc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/846913/000143774920024516/rdgdoc.xml","form_type":"4"}},{"id":2965475,"issuer":{"id":1599,"kind":"organization","name":"FUEL TECH, INC.","symbol":"FTEK"},"owners":[{"id":144893,"kind":"person","name":"Markowsky James J","position":1,"cik":"0001698347","reported_name":"Markowsky James J","relationship":{"director":true}}],"security":"Common Stock","published_at":"2020-11-27T19:32:29.000Z","date":"2020-11-24","kind":"exercise","acquired":true,"shares":44000,"price":0.965,"value":42460.0,"ownership":{"direct":true},"balance_after":106627,"source":{"system":"sec-edgar","filing":"0001437749-20-024516","document":"rdgdoc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/846913/000143774920024516/rdgdoc.xml","form_type":"4"}},{"id":3021983,"issuer":{"id":1599,"kind":"organization","name":"FUEL TECH, INC.","symbol":"FTEK"},"owners":[{"id":55702,"kind":"person","name":"Cummings William E JR","position":1,"cik":"0001358637","reported_name":"Cummings William E JR","relationship":{"officer":true,"officer_title":"Senior Vice President, Sales"}}],"security":"Common","published_at":"2020-09-28T21:00:40.000Z","date":"2020-09-25","kind":"purchase","acquired":true,"shares":5329,"price":0.7197,"value":3835.2813,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"The price reported in Column 4 is a weighted average share price. The shares were purchased in multiple transactions at prices ranging from $0.7098 to $0.72, inclusive. The reporting person undertakes to\nprovide to any security holder of Fuel Tech, Inc. or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the\nrange set forth in this footnote."}],"balance_after":292045,"source":{"system":"sec-edgar","filing":"0001437749-20-020365","document":"rdgdoc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/846913/000143774920020365/rdgdoc.xml","form_type":"4"}},{"id":3023251,"issuer":{"id":1599,"kind":"organization","name":"FUEL TECH, INC.","symbol":"FTEK"},"owners":[{"id":55702,"kind":"person","name":"Cummings William E JR","position":1,"cik":"0001358637","reported_name":"Cummings William E JR","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Senior Vice President, Sales"}}],"security":"Common","published_at":"2020-09-24T21:56:25.000Z","date":"2020-09-24","kind":"purchase","acquired":true,"shares":33886,"price":0.6412,"value":21727.7032,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"1. The price reported in Column 4 is a weighted average share price. The shares were purchased in multiple transactions at prices ranging from $0.6389 to $0.66, inclusive. The reporting person undertakes to provide to any security holder of Fuel Tech, Inc. or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the range set forth in this footnote."}],"balance_after":286716,"source":{"system":"sec-edgar","filing":"0000846913-20-000044","document":"wf-form4_160098456816259.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/846913/000084691320000044/wf-form4_160098456816259.xml","form_type":"4"}},{"id":3203570,"issuer":{"id":1599,"kind":"organization","name":"FUEL TECH, INC.","symbol":"FTEK"},"owners":[{"id":55703,"kind":"person","name":"ARNONE VINCENT J","position":1,"cik":"0001272727","reported_name":"ARNONE VINCENT J","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President & CEO"}}],"security":"Common Stock","published_at":"2020-03-18T20:39:56.000Z","date":"2020-03-17","kind":"purchase","acquired":true,"shares":15000,"price":0.4312,"value":6468.0,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"The price reported in Column 4 is a weighted average share price. The shares were purchased in multiple transactions at prices ranging from $0.427 to $0.450, inclusive. The reporting person undertakes to provide to any security holder of Fuel Tech, Inc. or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the range set forth in this footnote."}],"balance_after":524407,"source":{"system":"sec-edgar","filing":"0000846913-20-000023","document":"wf-form4_158456397846933.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/846913/000084691320000023/wf-form4_158456397846933.xml","form_type":"4"}},{"id":3207310,"issuer":{"id":1599,"kind":"organization","name":"FUEL TECH, INC.","symbol":"FTEK"},"owners":[{"id":144893,"kind":"person","name":"Markowsky James J","position":1,"cik":"0001698347","reported_name":"Markowsky James J","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common","published_at":"2020-03-17T20:37:31.000Z","date":"2020-03-17","kind":"grant","acquired":true,"shares":4500,"price":0.5877,"value":2644.65,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F2","text":"1. The price reported in Column 4 is a weighted average share price. The shares were purchased in multiple transactions at prices ranging from $0.529 to $0.5987, inclusive. The reporting person undertakes to provide to any security holder of Fuel Tech, Inc. or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the range set forth in this footnote."}],"balance_after":62627,"source":{"system":"sec-edgar","filing":"0000846913-20-000021","document":"wf-form4_158447743426707.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/846913/000084691320000021/wf-form4_158447743426707.xml","form_type":"4"}},{"id":3207309,"issuer":{"id":1599,"kind":"organization","name":"FUEL TECH, INC.","symbol":"FTEK"},"owners":[{"id":144893,"kind":"person","name":"Markowsky James J","position":1,"cik":"0001698347","reported_name":"Markowsky James J","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common","published_at":"2020-03-17T20:37:31.000Z","date":"2020-03-16","kind":"grant","acquired":true,"shares":25500,"price":0.4836,"value":12331.8,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"1. The price reported in Column 4 is a weighted average share price. The shares were purchased in multiple transactions at prices ranging from $0.43 to $0.55, inclusive. The reporting person undertakes to provide to any security holder of Fuel Tech, Inc. or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the range set forth in this footnote."}],"balance_after":58127,"source":{"system":"sec-edgar","filing":"0000846913-20-000021","document":"wf-form4_158447743426707.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/846913/000084691320000021/wf-form4_158447743426707.xml","form_type":"4"}},{"id":3339874,"issuer":{"id":1599,"kind":"organization","name":"FUEL TECH, INC.","symbol":"FTEK"},"owners":[{"id":55702,"kind":"person","name":"Cummings William E JR","position":1,"cik":"0001358637","reported_name":"Cummings William E JR","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Senior Vice President, Sales"}}],"security":"Common","published_at":"2019-12-17T21:37:44.000Z","date":"2019-12-16","kind":"tax_withholding","acquired":false,"shares":8523,"price":0.905,"value":7713.315,"ownership":{"direct":true},"balance_after":252830,"source":{"system":"sec-edgar","filing":"0000846913-19-000103","document":"wf-form4_157661864724065.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/846913/000084691319000103/wf-form4_157661864724065.xml","form_type":"4"}},{"id":3339901,"issuer":{"id":1599,"kind":"organization","name":"FUEL TECH, INC.","symbol":"FTEK"},"owners":[{"id":60831,"kind":"person","name":"Pach James M","position":1,"cik":"0001722648","reported_name":"Pach James M","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"PFO and Treasurer"}}],"security":"Restricted Stock Units","published_at":"2019-12-17T21:35:03.000Z","date":"2019-12-16","kind":"tax_withholding","acquired":false,"shares":11005,"price":0.905,"value":9959.525,"ownership":{"direct":true},"balance_after":38995,"source":{"system":"sec-edgar","filing":"0000846913-19-000101","document":"wf-form4_157661848650830.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/846913/000084691319000101/wf-form4_157661848650830.xml","form_type":"4"}},{"id":3406059,"issuer":{"id":1599,"kind":"organization","name":"FUEL TECH, INC.","symbol":"FTEK"},"owners":[{"id":55702,"kind":"person","name":"Cummings William E JR","position":1,"cik":"0001358637","reported_name":"Cummings William E JR","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Senior Vice President, Sales"}}],"security":"Common","published_at":"2019-09-26T21:21:43.000Z","date":"2019-09-26","kind":"purchase","acquired":true,"shares":28489,"price":0.9669,"value":27546.0141,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"The price reported in Column 4 is a weighted average share price. The shares were purchased in multiple transactions at prices ranging from $0.94966 to $1.00, inclusive. The reporting person undertakes to provide to any security holder of Fuel Tech, Inc. or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the range set forth in this footnote."}],"balance_after":261353,"source":{"system":"sec-edgar","filing":"0000846913-19-000077","document":"wf-form4_156953288755404.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/846913/000084691319000077/wf-form4_156953288755404.xml","form_type":"4"}},{"id":3406671,"issuer":{"id":1599,"kind":"organization","name":"FUEL TECH, INC.","symbol":"FTEK"},"owners":[{"id":55702,"kind":"person","name":"Cummings William E JR","position":1,"cik":"0001358637","reported_name":"Cummings William E JR","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Senior Vice President, Sales"}}],"security":"Common","published_at":"2019-09-25T21:21:54.000Z","date":"2019-09-25","kind":"purchase","acquired":true,"shares":21511,"price":0.9584,"value":20616.1424,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"The price reported in Column 4 is a weighted average share price. The shares were purchased in multiple transactions at prices ranging from $0.9175 to $0.98723, inclusive. The reporting person undertakes to provide to any security holder of Fuel Tech, Inc. or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the range set forth in this footnote."}],"balance_after":232864,"source":{"system":"sec-edgar","filing":"0000846913-19-000075","document":"wf-form4_156944649859101.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/846913/000084691319000075/wf-form4_156944649859101.xml","form_type":"4"}},{"id":3421034,"issuer":{"id":1599,"kind":"organization","name":"FUEL TECH, INC.","symbol":"FTEK"},"owners":[{"id":55703,"kind":"person","name":"ARNONE VINCENT J","position":1,"cik":"0001272727","reported_name":"ARNONE VINCENT J","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President & CEO"}}],"security":"Common Stock","published_at":"2019-09-06T20:37:15.000Z","date":"2019-09-06","kind":"purchase","acquired":true,"shares":20000,"price":1.007,"value":20140.0,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"1. The price reported in Column 4 is a weighted average share price. The shares were purchased in multiple transactions at prices ranging from $0.9599 to $1.03, inclusive. The reporting person undertakes to provide to any security holder of Fuel Tech, Inc. or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the range set forth in this footnote."}],"balance_after":509407,"source":{"system":"sec-edgar","filing":"0000846913-19-000069","document":"wf-form4_156780221984929.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/846913/000084691319000069/wf-form4_156780221984929.xml","form_type":"4"}},{"id":3427610,"issuer":{"id":1599,"kind":"organization","name":"FUEL TECH, INC.","symbol":"FTEK"},"owners":[{"id":144893,"kind":"person","name":"Markowsky James J","position":1,"cik":"0001698347","reported_name":"Markowsky James J","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common","published_at":"2019-08-28T20:16:39.000Z","date":"2019-08-28","kind":"purchase","acquired":true,"shares":20000,"price":0.822,"value":16440.0,"ownership":{"direct":true},"balance_after":32627,"source":{"system":"sec-edgar","filing":"0000846913-19-000067","document":"wf-form4_156702337615777.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/846913/000084691319000067/wf-form4_156702337615777.xml","form_type":"4"}},{"id":3486889,"issuer":{"id":1599,"kind":"organization","name":"FUEL TECH, INC.","symbol":"FTEK"},"owners":[{"id":55703,"kind":"person","name":"ARNONE VINCENT J","position":1,"cik":"0001272727","reported_name":"ARNONE VINCENT J","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President & CEO"}}],"security":"Common Stock","published_at":"2019-06-18T20:45:34.000Z","date":"2019-06-18","kind":"purchase","acquired":true,"shares":15000,"price":1.215,"value":18225.0,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"The price reported in Column 4 is a weighted average share price. The shares were purchased in multiple transactions at prices ranging from $1.20 to $1.227, inclusive. The reporting person undertakes to provide to any security holder of Fuel Tech, Inc. or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the range set forth in this footnote."}],"balance_after":489407,"source":{"system":"sec-edgar","filing":"0000846913-19-000056","document":"wf-form4_156089071865681.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/846913/000084691319000056/wf-form4_156089071865681.xml","form_type":"4"}},{"id":3516067,"issuer":{"id":1599,"kind":"organization","name":"FUEL TECH, INC.","symbol":"FTEK"},"owners":[{"id":60831,"kind":"person","name":"Pach James M","position":1,"cik":"0001722648","reported_name":"Pach James M","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"PFO and Treasurer"}}],"security":"Restricted Stock Units","published_at":"2019-05-22T21:19:45.000Z","date":"2019-05-22","kind":"sale","acquired":false,"shares":6859,"price":1.54,"value":10562.86,"ownership":{"direct":true},"balance_after":50000,"source":{"system":"sec-edgar","filing":"0000846913-19-000054","document":"wf-form4_155855997065538.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/846913/000084691319000054/wf-form4_155855997065538.xml","form_type":"4"}},{"id":3519530,"issuer":{"id":1599,"kind":"organization","name":"FUEL TECH, INC.","symbol":"FTEK"},"owners":[{"id":157414,"kind":"person","name":"SHAW THOMAS S","position":1,"cik":"0001078772","reported_name":"SHAW THOMAS S","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2019-05-20T20:48:10.000Z","date":"2019-05-17","kind":"grant","acquired":true,"shares":12627,"price":1.584,"value":20001.168,"ownership":{"direct":true},"balance_after":32627,"source":{"system":"sec-edgar","filing":"0000846913-19-000052","document":"wf-form4_155838527545246.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/846913/000084691319000052/wf-form4_155838527545246.xml","form_type":"4"}},{"id":3519451,"issuer":{"id":1599,"kind":"organization","name":"FUEL TECH, INC.","symbol":"FTEK"},"owners":[{"id":41128,"kind":"person","name":"Jones Sharon L","position":1,"cik":"0001734963","reported_name":"Jones Sharon L","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common","published_at":"2019-05-20T20:42:06.000Z","date":"2019-05-17","kind":"grant","acquired":true,"shares":12627,"price":1.584,"value":20001.168,"ownership":{"direct":true},"balance_after":16577,"source":{"system":"sec-edgar","filing":"0000846913-19-000050","document":"wf-form4_155838491214027.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/846913/000084691319000050/wf-form4_155838491214027.xml","form_type":"4"}},{"id":3519450,"issuer":{"id":1599,"kind":"organization","name":"FUEL TECH, INC.","symbol":"FTEK"},"owners":[{"id":41128,"kind":"person","name":"Jones Sharon L","position":1,"cik":"0001734963","reported_name":"Jones Sharon L","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common","published_at":"2019-05-20T20:39:51.000Z","date":"2018-08-23","kind":"purchase","acquired":true,"shares":3950,"price":1.04,"value":4108.0,"ownership":{"direct":true},"balance_after":3950,"source":{"system":"sec-edgar","filing":"0000846913-19-000048","document":"wf-form4_155838477570930.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/846913/000084691319000048/wf-form4_155838477570930.xml","form_type":"4"}},{"id":3519449,"issuer":{"id":1599,"kind":"organization","name":"FUEL TECH, INC.","symbol":"FTEK"},"owners":[{"id":41127,"kind":"person","name":"BAILEY DOUGLAS G","position":1,"cik":"0001246268","reported_name":"BAILEY DOUGLAS G","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common","published_at":"2019-05-20T20:37:41.000Z","date":"2019-05-16","kind":"grant","acquired":true,"shares":12627,"price":1.584,"value":20001.168,"ownership":{"direct":true},"balance_after":1905505,"source":{"system":"sec-edgar","filing":"0000846913-19-000046","document":"wf-form4_155838464501605.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/846913/000084691319000046/wf-form4_155838464501605.xml","form_type":"4"}},{"id":3522408,"issuer":{"id":1599,"kind":"organization","name":"FUEL TECH, INC.","symbol":"FTEK"},"owners":[{"id":144893,"kind":"person","name":"Markowsky James J","position":1,"cik":"0001698347","reported_name":"Markowsky James J","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common","published_at":"2019-05-17T21:19:23.000Z","date":"2019-05-17","kind":"grant","acquired":true,"shares":12627,"price":1.584,"value":20001.168,"ownership":{"direct":true},"balance_after":12627,"source":{"system":"sec-edgar","filing":"0000846913-19-000039","document":"wf-form4_155812794857287.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/846913/000084691319000039/wf-form4_155812794857287.xml","form_type":"4"}},{"id":3522614,"issuer":{"id":1599,"kind":"organization","name":"FUEL TECH, INC.","symbol":"FTEK"},"owners":[{"id":41126,"kind":"person","name":"ZEITLER DENNIS L","position":1,"cik":"0001118164","reported_name":"ZEITLER DENNIS L","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2019-05-17T20:51:36.000Z","date":"2019-05-17","kind":"grant","acquired":true,"shares":12627,"price":1.584,"value":20001.168,"ownership":{"direct":true},"balance_after":62627,"source":{"system":"sec-edgar","filing":"0000846913-19-000037","document":"wf-form4_155812628202805.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/846913/000084691319000037/wf-form4_155812628202805.xml","form_type":"4"}},{"id":3580372,"issuer":{"id":1599,"kind":"organization","name":"FUEL TECH, INC.","symbol":"FTEK"},"owners":[{"id":55702,"kind":"person","name":"Cummings William E JR","position":1,"cik":"0001358637","reported_name":"Cummings William E JR","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Senior Vice President, Sales"}}],"security":"Common","published_at":"2019-03-25T20:46:08.000Z","date":"2019-03-21","kind":"grant","acquired":true,"shares":25000,"price":1.83,"value":45750.0,"ownership":{"direct":true},"balance_after":211353,"source":{"system":"sec-edgar","filing":"0000846913-19-000025","document":"wf-form4_155354675412171.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/846913/000084691319000025/wf-form4_155354675412171.xml","form_type":"4"}},{"id":3580370,"issuer":{"id":1599,"kind":"organization","name":"FUEL TECH, INC.","symbol":"FTEK"},"owners":[{"id":144893,"kind":"person","name":"Markowsky James J","position":1,"cik":"0001698347","reported_name":"Markowsky James J","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common","published_at":"2019-03-25T20:39:36.000Z","date":"2019-03-22","kind":"sale","acquired":false,"shares":20000,"price":1.66,"value":33200.0,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"1.The price reported in Column 4 is a weighted average share price. The shares were sold in multiple transactions at prices ranging from $1.66 to $1.70, inclusive. The reporting person undertakes to provide to any security holder of Fuel Tech, Inc. or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote"}],"balance_after":0,"source":{"system":"sec-edgar","filing":"0000846913-19-000023","document":"wf-form4_155354636166638.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/846913/000084691319000023/wf-form4_155354636166638.xml","form_type":"4"}},{"id":3834380,"issuer":{"id":1599,"kind":"organization","name":"FUEL TECH, INC.","symbol":"FTEK"},"owners":[{"id":55703,"kind":"person","name":"ARNONE VINCENT J","position":1,"cik":"0001272727","reported_name":"ARNONE VINCENT J","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President & CEO"}}],"security":"Common Stock","published_at":"2018-08-24T20:19:09.000Z","date":"2018-08-23","kind":"purchase","acquired":true,"shares":2033,"price":1.08,"value":2195.64,"ownership":{"direct":true},"balance_after":474407,"source":{"system":"sec-edgar","filing":"0000846913-18-000059","document":"wf-form4_153514193325209.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/846913/000084691318000059/wf-form4_153514193325209.xml","form_type":"4"}},{"id":3835234,"issuer":{"id":1599,"kind":"organization","name":"FUEL TECH, INC.","symbol":"FTEK"},"owners":[{"id":55703,"kind":"person","name":"ARNONE VINCENT J","position":1,"cik":"0001272727","reported_name":"ARNONE VINCENT J","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President & CEO"}}],"security":"Common Stock","published_at":"2018-08-23T20:45:05.000Z","date":"2018-08-22","kind":"purchase","acquired":true,"shares":22967,"price":1.022,"value":23472.274,"ownership":{"direct":true},"balance_after":472374,"source":{"system":"sec-edgar","filing":"0000846913-18-000057","document":"wf-form4_153505708932645.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/846913/000084691318000057/wf-form4_153505708932645.xml","form_type":"4"}},{"id":3872046,"issuer":{"id":1599,"kind":"organization","name":"FUEL TECH, INC.","symbol":"FTEK"},"owners":[{"id":55702,"kind":"person","name":"Cummings William E JR","position":1,"cik":"0001358637","reported_name":"Cummings William E JR","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Senior Vice President, Sales"}}],"security":"Common","published_at":"2018-07-06T20:07:03.000Z","date":"2018-06-29","kind":"purchase","acquired":true,"shares":10200,"price":1.079,"value":11005.8,"ownership":{"direct":true},"balance_after":186353,"source":{"system":"sec-edgar","filing":"0001358637-18-000006","document":"wf-form4_153090760670708.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/846913/000135863718000006/wf-form4_153090760670708.xml","form_type":"4"}},{"id":3983476,"issuer":{"id":1599,"kind":"organization","name":"FUEL TECH, INC.","symbol":"FTEK"},"owners":[{"id":144252,"kind":"person","name":"BAILEY BETTYE J","position":1,"cik":"0001671745","reported_name":"BAILEY BETTYE J","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2018-03-26T17:15:02.000Z","date":"2017-10-12","kind":"other","acquired":true,"shares":1367589,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F2","text":"Transfer by inheritance of 1,367,509 shares from the Estate of Ralph E. Bailey."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"Excludes 245,000 shares owned by a family trust in which Mrs. Bailey has no beneficial ownership interest."}],"balance_after":4328973,"source":{"system":"sec-edgar","filing":"0001472375-18-000026","document":"primary_doc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/846913/000147237518000026/primary_doc.xml","form_type":"5"}},{"id":3983475,"issuer":{"id":1599,"kind":"organization","name":"FUEL TECH, INC.","symbol":"FTEK"},"owners":[{"id":144252,"kind":"person","name":"BAILEY BETTYE J","position":1,"cik":"0001671745","reported_name":"BAILEY BETTYE J","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2018-03-26T17:15:02.000Z","date":"2017-08-27","kind":"other","acquired":true,"shares":32028,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"Transfer by inheritance of 32,028 shares from a marital trust that were formerly owned by the Estate of Ralph E. Bailey, the deceased husband of Mrs. Bailey."}],"balance_after":2961384,"source":{"system":"sec-edgar","filing":"0001472375-18-000026","document":"primary_doc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/846913/000147237518000026/primary_doc.xml","form_type":"5"}},{"id":4028676,"issuer":{"id":1599,"kind":"organization","name":"FUEL TECH, INC.","symbol":"FTEK"},"owners":[{"id":168923,"kind":"person","name":"Collins David S","position":1,"cik":"0001497600","reported_name":"Collins David S","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Sr. Vice President"}}],"security":"Common Stock","published_at":"2018-02-28T22:04:02.000Z","date":"2018-02-26","kind":"tax_withholding","acquired":false,"shares":3524,"price":1.095,"value":3858.78,"ownership":{"direct":true},"balance_after":9809,"source":{"system":"sec-edgar","filing":"0000846913-18-000006","document":"wf-form4_151985541246522.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/846913/000084691318000006/wf-form4_151985541246522.xml","form_type":"4"}},{"id":4028675,"issuer":{"id":1599,"kind":"organization","name":"FUEL TECH, INC.","symbol":"FTEK"},"owners":[{"id":168923,"kind":"person","name":"Collins David S","position":1,"cik":"0001497600","reported_name":"Collins David S","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Sr. Vice President"}}],"security":"Common Stock","published_at":"2018-02-28T22:04:02.000Z","date":"2018-02-26","kind":"grant","acquired":true,"shares":13333,"price":0,"value":0.0,"ownership":{"direct":true},"balance_after":13333,"source":{"system":"sec-edgar","filing":"0000846913-18-000006","document":"wf-form4_151985541246522.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/846913/000084691318000006/wf-form4_151985541246522.xml","form_type":"4"}},{"id":4028673,"issuer":{"id":1599,"kind":"organization","name":"FUEL TECH, INC.","symbol":"FTEK"},"owners":[{"id":41127,"kind":"person","name":"BAILEY DOUGLAS G","position":1,"cik":"0001246268","reported_name":"BAILEY DOUGLAS G","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common","published_at":"2018-02-28T22:01:45.000Z","date":"2018-02-26","kind":"tax_withholding","acquired":false,"shares":3524,"price":1.095,"value":3858.78,"ownership":{"direct":true},"balance_after":1882878,"source":{"system":"sec-edgar","filing":"0000846913-18-000004","document":"wf-form4_151985528264913.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/846913/000084691318000004/wf-form4_151985528264913.xml","form_type":"4"}},{"id":4028672,"issuer":{"id":1599,"kind":"organization","name":"FUEL TECH, INC.","symbol":"FTEK"},"owners":[{"id":41127,"kind":"person","name":"BAILEY DOUGLAS G","position":1,"cik":"0001246268","reported_name":"BAILEY DOUGLAS G","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2018-02-28T22:01:45.000Z","date":"2018-02-26","kind":"grant","acquired":true,"shares":13333,"price":0,"value":0.0,"ownership":{"direct":true},"balance_after":1886402,"source":{"system":"sec-edgar","filing":"0000846913-18-000004","document":"wf-form4_151985528264913.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/846913/000084691318000004/wf-form4_151985528264913.xml","form_type":"4"}},{"id":4028671,"issuer":{"id":1599,"kind":"organization","name":"FUEL TECH, INC.","symbol":"FTEK"},"owners":[{"id":55703,"kind":"person","name":"ARNONE VINCENT J","position":1,"cik":"0001272727","reported_name":"ARNONE VINCENT J","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President & CEO"}}],"security":"Common Stock","published_at":"2018-02-28T21:54:31.000Z","date":"2018-02-26","kind":"grant","acquired":true,"shares":26667,"price":0,"value":0.0,"ownership":{"direct":true},"balance_after":449407,"source":{"system":"sec-edgar","filing":"0000846913-18-000002","document":"wf-form4_151985480325477.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/846913/000084691318000002/wf-form4_151985480325477.xml","form_type":"4"}},{"id":4129373,"issuer":{"id":1599,"kind":"organization","name":"FUEL TECH, INC.","symbol":"FTEK"},"owners":[{"id":55703,"kind":"person","name":"ARNONE VINCENT J","position":1,"cik":"0001272727","reported_name":"ARNONE VINCENT J","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President & CEO"}}],"security":"Restricted Stock Units","published_at":"2017-12-18T21:26:49.000Z","date":"2017-12-15","kind":"grant","acquired":true,"shares":100000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"Each Restricted Stock Unit represents a contingent right to receive one stock of FTEK Common Stock."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F2","text":"The Restricted Stock Units vest in two installments: (i) one half of the total RSUs awarded shall vest on the second anniversary after the transaction date shown above, and (ii) the final one half shall vest on the third anniversary of the transaction date shown above. Subject to the restrictions on distribution set forth in the registrant's 2017 RSU Award Agreement, generally, shares will be delivered to the reporting person in respect of vested RSUs as soon as practicable after each vesting date, unless the reporting person has elected to defer distribution until a later date."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F2","text":"The Restricted Stock Units vest in two installments: (i) one half of the total RSUs awarded shall vest on the second anniversary after the transaction date shown above, and (ii) the final one half shall vest on the third anniversary of the transaction date shown above. Subject to the restrictions on distribution set forth in the registrant's 2017 RSU Award Agreement, generally, shares will be delivered to the reporting person in respect of vested RSUs as soon as practicable after each vesting date, unless the reporting person has elected to defer distribution until a later date."}],"balance_after":422740,"derivative":{"underlying":"Common Stock","underlying_shares":100000},"source":{"system":"sec-edgar","filing":"0000846913-17-000109","document":"wf-form4_151363239627658.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/846913/000084691317000109/wf-form4_151363239627658.xml","form_type":"4"}},{"id":4129372,"issuer":{"id":1599,"kind":"organization","name":"FUEL TECH, INC.","symbol":"FTEK"},"owners":[{"id":60831,"kind":"person","name":"Pach James M","position":1,"cik":"0001722648","reported_name":"Pach James M","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Acting PFO & Treasurer"}}],"security":"Restricted Stock Units","published_at":"2017-12-18T21:26:07.000Z","date":"2017-12-15","kind":"grant","acquired":true,"shares":50000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"Each Restricted Stock Unit represents a contingent right to receive one stock of FTEK Common Stock."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F2","text":"The Restricted Stock Units vest in two installments: (i) one half of the total RSUs awarded shall vest on the second anniversary after the transaction date shown above, and (ii) the final one half shall vest on the third anniversary of the transaction date shown above. Subject to the restrictions on distribution set forth in the registrant's 2017 RSU Award Agreement, generally, shares will be delivered to the reporting person in respect of vested RSUs as soon as practicable after each vesting date, unless the reporting person has elected to defer distribution until a later date."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F2","text":"The Restricted Stock Units vest in two installments: (i) one half of the total RSUs awarded shall vest on the second anniversary after the transaction date shown above, and (ii) the final one half shall vest on the third anniversary of the transaction date shown above. Subject to the restrictions on distribution set forth in the registrant's 2017 RSU Award Agreement, generally, shares will be delivered to the reporting person in respect of vested RSUs as soon as practicable after each vesting date, unless the reporting person has elected to defer distribution until a later date."}],"balance_after":56859,"derivative":{"underlying":"Common Stock","underlying_shares":50000},"source":{"system":"sec-edgar","filing":"0000846913-17-000108","document":"wf-form4_151363235310853.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/846913/000084691317000108/wf-form4_151363235310853.xml","form_type":"4"}},{"id":4134051,"issuer":{"id":1599,"kind":"organization","name":"FUEL TECH, INC.","symbol":"FTEK"},"owners":[{"id":41126,"kind":"person","name":"ZEITLER DENNIS L","position":1,"cik":"0001118164","reported_name":"ZEITLER DENNIS L","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2017-12-13T21:48:27.000Z","date":"2017-12-12","kind":"purchase","acquired":true,"shares":50000,"price":1.0064,"value":50320.0,"ownership":{"direct":true},"balance_after":50000,"source":{"system":"sec-edgar","filing":"0000846913-17-000107","document":"wf-form4_151320168768163.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/846913/000084691317000107/wf-form4_151320168768163.xml","form_type":"4"}},{"id":4138529,"issuer":{"id":1599,"kind":"organization","name":"FUEL TECH, INC.","symbol":"FTEK"},"owners":[{"id":41127,"kind":"person","name":"BAILEY DOUGLAS G","position":1,"cik":"0001246268","reported_name":"BAILEY DOUGLAS G","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Option","published_at":"2017-12-08T21:10:48.000Z","date":"2017-12-07","kind":"grant","acquired":true,"shares":44000,"price":0,"value":0.0,"ownership":{"direct":true},"balance_after":44000,"derivative":{"exercise_price":0.965,"exercise_date":"2017-12-07","expiration_date":"2027-12-07","underlying":"Common Stock","underlying_shares":44000},"source":{"system":"sec-edgar","filing":"0000846913-17-000105","document":"wf-form4_151276743402971.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/846913/000084691317000105/wf-form4_151276743402971.xml","form_type":"4"}},{"id":4138528,"issuer":{"id":1599,"kind":"organization","name":"FUEL TECH, INC.","symbol":"FTEK"},"owners":[{"id":157414,"kind":"person","name":"SHAW THOMAS S","position":1,"cik":"0001078772","reported_name":"SHAW THOMAS S","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Option","published_at":"2017-12-08T21:09:33.000Z","date":"2017-12-07","kind":"grant","acquired":true,"shares":44000,"price":0,"value":0.0,"ownership":{"direct":true},"balance_after":44000,"derivative":{"exercise_price":0.965,"exercise_date":"2017-12-07","expiration_date":"2027-12-07","underlying":"Common Stock","underlying_shares":44000},"source":{"system":"sec-edgar","filing":"0000846913-17-000104","document":"wf-form4_151276735967053.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/846913/000084691317000104/wf-form4_151276735967053.xml","form_type":"4"}},{"id":4138527,"issuer":{"id":1599,"kind":"organization","name":"FUEL TECH, INC.","symbol":"FTEK"},"owners":[{"id":41126,"kind":"person","name":"ZEITLER DENNIS L","position":1,"cik":"0001118164","reported_name":"ZEITLER DENNIS L","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Option","published_at":"2017-12-08T21:08:21.000Z","date":"2017-12-07","kind":"grant","acquired":true,"shares":44000,"price":0,"value":0.0,"ownership":{"direct":true},"balance_after":44000,"derivative":{"exercise_price":0.965,"exercise_date":"2017-12-07","expiration_date":"2027-12-07","underlying":"Common Stock","underlying_shares":44000},"source":{"system":"sec-edgar","filing":"0000846913-17-000103","document":"wf-form4_151276728751480.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/846913/000084691317000103/wf-form4_151276728751480.xml","form_type":"4"}},{"id":4138526,"issuer":{"id":1599,"kind":"organization","name":"FUEL TECH, INC.","symbol":"FTEK"},"owners":[{"id":144893,"kind":"person","name":"Markowsky James J","position":1,"cik":"0001698347","reported_name":"Markowsky James J","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Option","published_at":"2017-12-08T21:05:23.000Z","date":"2017-12-07","kind":"grant","acquired":true,"shares":44000,"price":0,"value":0.0,"ownership":{"direct":true},"balance_after":44000,"derivative":{"exercise_price":0.965,"exercise_date":"2017-12-07","expiration_date":"2027-12-07","underlying":"Common Stock","underlying_shares":44000},"source":{"system":"sec-edgar","filing":"0000846913-17-000102","document":"wf-form4_151276710948164.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/846913/000084691317000102/wf-form4_151276710948164.xml","form_type":"4"}},{"id":4206503,"issuer":{"id":1599,"kind":"organization","name":"FUEL TECH, INC.","symbol":"FTEK"},"owners":[{"id":55703,"kind":"person","name":"ARNONE VINCENT J","position":1,"cik":"0001272727","reported_name":"ARNONE VINCENT J","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President & CEO"}}],"security":"Common Stock","published_at":"2017-09-19T20:32:00.000Z","date":"2017-09-15","kind":"purchase","acquired":true,"shares":18000,"price":0.939,"value":16902.0,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"The price reported in Column 4 is a weighted average share price. The shares were purchased in multiple transactions at prices ranging from $0.91 to $0.95, inclusive. The reporting person undertakes to provide to any security holder of Fuel Tech, Inc. or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the range set forth in this footnote."}],"balance_after":322740,"source":{"system":"sec-edgar","filing":"0000846913-17-000079","document":"wf-form4_150585310583093.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/846913/000084691317000079/wf-form4_150585310583093.xml","form_type":"4"}},{"id":4207693,"issuer":{"id":1599,"kind":"organization","name":"FUEL TECH, INC.","symbol":"FTEK"},"owners":[{"id":55703,"kind":"person","name":"ARNONE VINCENT J","position":1,"cik":"0001272727","reported_name":"ARNONE VINCENT J","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President & CEO"}}],"security":"Common Stock","published_at":"2017-09-18T20:20:50.000Z","date":"2017-09-14","kind":"purchase","acquired":true,"shares":32000,"price":0.924,"value":29568.0,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"The price reported in Column 4 is a weighted average share price. The shares were purchased in multiple transactions at prices ranging from $0.86 to $0.95, inclusive. The reporting person undertakes to provide to any security holder of Fuel Tech, Inc. or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the range set forth in this footnote."}],"balance_after":304740,"source":{"system":"sec-edgar","filing":"0000846913-17-000077","document":"wf-form4_150576603581510.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/846913/000084691317000077/wf-form4_150576603581510.xml","form_type":"4"}}],"next_cursor":"2017-09-18T20:20:50.000000Z,4207693"}