{"transactions":[{"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":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":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":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":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":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":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":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":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":4269680,"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":true,"ten_percent_owner":false,"other":false,"officer_title":"Executive Chairman"}}],"security":"Common Stock","published_at":"2017-06-30T20:21:41.000Z","date":"2017-06-28","kind":"tax_withholding","acquired":false,"shares":7769,"price":0.83,"value":6448.27,"ownership":{"direct":true},"balance_after":1873069,"source":{"system":"sec-edgar","filing":"0000846913-17-000045","document":"wf-form4_149885408741626.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/846913/000084691317000045/wf-form4_149885408741626.xml","form_type":"4"}},{"id":4425918,"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":true,"ten_percent_owner":false,"other":false,"officer_title":"Executive Chairman"}}],"security":"Common Stock","published_at":"2017-02-24T21:42:35.000Z","date":"2017-02-22","kind":"grant","acquired":true,"shares":12000,"price":0,"value":0.0,"ownership":{"direct":true},"balance_after":1880838,"source":{"system":"sec-edgar","filing":"0000846913-17-000018","document":"wf-form4_148797254285612.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/846913/000084691317000018/wf-form4_148797254285612.xml","form_type":"4"}}]}