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The price reported reflects the weighted average sales price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer of a security holder of the issuer full information regarding the number of shares and prices at which the transaction was affected."}],"balance_after":214324,"source":{"system":"sec-edgar","filing":"0001676532-26-000012","document":"wk-form4_1789506774.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1676532/000167653226000012/wk-form4_1789506774.xml","form_type":"4"}},{"id":4618456,"issuer":{"id":399,"kind":"organization","name":"WILLIS LEASE FINANCE CORP","symbol":"WLFC"},"owners":[{"id":27292,"kind":"person","name":"Flaherty Scott B.","position":1,"cik":"0001676532","reported_name":"Flaherty Scott B.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP, CFO"}}],"security":"Common Stock","published_at":"2026-09-15T21:12:57.000Z","date":"2026-09-14","kind":"sale","planned":false,"acquired":false,"shares":18695,"price":54.57,"value":1020186.15,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F2","text":"This transaction was executed in multiple trades at prices ranging from $54.01 to $55.30. The price reported reflects the weighted average sales price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer of a security holder of the issuer full information regarding the number of shares and prices at which the transaction was affected."}],"balance_after":222650,"source":{"system":"sec-edgar","filing":"0001676532-26-000012","document":"wk-form4_1789506774.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1676532/000167653226000012/wk-form4_1789506774.xml","form_type":"4"}},{"id":4618455,"issuer":{"id":399,"kind":"organization","name":"WILLIS LEASE FINANCE CORP","symbol":"WLFC"},"owners":[{"id":27292,"kind":"person","name":"Flaherty Scott B.","position":1,"cik":"0001676532","reported_name":"Flaherty Scott B.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP, CFO"}}],"security":"Common Stock","published_at":"2026-09-15T21:12:57.000Z","date":"2026-09-11","kind":"sale","planned":false,"acquired":false,"shares":2979,"price":56.18,"value":167360.22,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"This transaction was executed in multiple trades at prices ranging from $55.97 to $56.29. The price reported reflects the weighted average sales price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer of a security holder of the issuer full information regarding the number of shares and prices at which the transaction was affected."}],"balance_after":241345,"source":{"system":"sec-edgar","filing":"0001676532-26-000012","document":"wk-form4_1789506774.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1676532/000167653226000012/wk-form4_1789506774.xml","form_type":"4"}},{"id":2403,"issuer":{"id":399,"kind":"organization","name":"WILLIS LEASE FINANCE CORP","symbol":"WLFC"},"owners":[{"id":1819,"kind":"person","name":"Willis Austin Chandler","position":1,"cik":"0001453104","reported_name":"Willis Austin Chandler","relationship":{"director":true,"officer":true,"ten_percent_owner":true,"other":false,"officer_title":"President and CEO"}}],"security":"Common Stock","published_at":"2026-09-03T20:30:20.000Z","date":"2026-09-01","kind":"sale","planned":true,"acquired":false,"shares":15000,"price":53.9043,"value":808564.5,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on March 24, 2026."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"This transaction was executed in multiple trades at prices ranging from $53.55 to $54.25, inclusive. The price reported reflects the weighted average sale price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares sold at each separate price within the range set forth in footnote (2) of this Form 4."}],"balance_after":420888,"source":{"system":"sec-edgar","filing":"0000905148-26-004074","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1453104/000090514826004074/form4.xml","form_type":"4"}},{"id":431,"issuer":{"id":399,"kind":"organization","name":"WILLIS LEASE FINANCE CORP","symbol":"WLFC"},"owners":[{"id":400,"kind":"person","name":"WILLIS CHARLES F IV","position":1,"cik":"0001033309","reported_name":"WILLIS CHARLES F IV","relationship":{"director":true,"officer":true,"ten_percent_owner":true,"other":false,"officer_title":"Executive Chairman"}}],"security":"Common Stock","published_at":"2026-09-02T20:11:12.000Z","date":"2026-08-31","kind":"sale","planned":false,"acquired":false,"shares":400,"price":52.9505,"value":21180.2,"ownership":{"direct":false,"nature":"Spouse"},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"This transaction was executed in multiple trades at prices ranging from $52.95 to $52.96, inclusive. The price reported reflects the weighted average sale price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares sold at each separate price within the range set forth in footnote (1) of this Form 4."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"Charlotte Montressor Willis."}],"balance_after":40280,"source":{"system":"sec-edgar","filing":"0000905148-26-004063","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1033309/000090514826004063/form4.xml","form_type":"4"}},{"id":674184,"issuer":{"id":399,"kind":"organization","name":"WILLIS LEASE FINANCE CORP","symbol":"WLFC"},"owners":[{"id":400,"kind":"person","name":"WILLIS CHARLES F IV","position":1,"cik":"0001033309","reported_name":"WILLIS CHARLES F IV","relationship":{"director":true,"officer":true,"ten_percent_owner":true,"other":false,"officer_title":"Executive Chairman"}}],"security":"Common Stock","published_at":"2026-08-27T21:05:29.000Z","date":"2026-08-26","kind":"sale","planned":true,"acquired":false,"shares":15600,"price":55.1139,"value":859776.84,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on May 18, 2026, which was terminated on August 26, 2026."},{"field":"price","element":"transactionPricePerShare","label":"F3","text":"This transaction was executed in multiple trades at prices ranging from $54.62 to $55.58, inclusive. The price reported reflects the weighted average sale price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares sold at each separate price within the range set forth in footnote (3) of this Form 4."}],"balance_after":2492143,"source":{"system":"sec-edgar","filing":"0000905148-26-003969","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1018164/000090514826003969/form4.xml","form_type":"4"}},{"id":674183,"issuer":{"id":399,"kind":"organization","name":"WILLIS LEASE FINANCE CORP","symbol":"WLFC"},"owners":[{"id":400,"kind":"person","name":"WILLIS CHARLES F IV","position":1,"cik":"0001033309","reported_name":"WILLIS CHARLES F IV","relationship":{"director":true,"officer":true,"ten_percent_owner":true,"other":false,"officer_title":"Executive Chairman"}}],"security":"Common Stock","published_at":"2026-08-27T21:05:29.000Z","date":"2026-08-25","kind":"sale","planned":true,"acquired":false,"shares":113,"price":56.05,"value":6333.65,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on May 18, 2026, which was terminated on August 26, 2026."}],"balance_after":2507743,"source":{"system":"sec-edgar","filing":"0000905148-26-003969","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1018164/000090514826003969/form4.xml","form_type":"4"}},{"id":674182,"issuer":{"id":399,"kind":"organization","name":"WILLIS LEASE FINANCE CORP","symbol":"WLFC"},"owners":[{"id":400,"kind":"person","name":"WILLIS CHARLES F IV","position":1,"cik":"0001033309","reported_name":"WILLIS CHARLES F IV","relationship":{"director":true,"officer":true,"ten_percent_owner":true,"other":false,"officer_title":"Executive Chairman"}}],"security":"Common Stock","published_at":"2026-08-27T21:05:29.000Z","date":"2026-08-25","kind":"sale","planned":true,"acquired":false,"shares":11287,"price":54.4972,"value":615109.8964,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on May 18, 2026, which was terminated on August 26, 2026."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"This transaction was executed in multiple trades at prices ranging from $53.91 to $54.90, inclusive. The price reported reflects the weighted average sale price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares sold at each separate price within the range set forth in footnote (2) of this Form 4."}],"balance_after":2507856,"source":{"system":"sec-edgar","filing":"0000905148-26-003969","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1018164/000090514826003969/form4.xml","form_type":"4"}},{"id":677940,"issuer":{"id":399,"kind":"organization","name":"WILLIS LEASE FINANCE CORP","symbol":"WLFC"},"owners":[{"id":400,"kind":"person","name":"WILLIS CHARLES F IV","position":1,"cik":"0001033309","reported_name":"WILLIS CHARLES F IV","relationship":{"director":true,"officer":true,"ten_percent_owner":true,"other":false,"officer_title":"Executive Chairman"}}],"security":"Common Stock","published_at":"2026-08-24T22:27:26.000Z","date":"2026-08-24","kind":"sale","planned":true,"acquired":false,"shares":13684,"price":55.232,"value":755794.688,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on May 18, 2026."},{"field":"price","element":"transactionPricePerShare","label":"F6","text":"This transaction was executed in multiple trades at prices ranging from $55.03 to $55.53, inclusive. The price reported reflects the weighted average sale price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares sold at each separate price within the range set forth in footnote (6) of this Form 4."}],"balance_after":2519143,"source":{"system":"sec-edgar","filing":"0000905148-26-003886","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":6,"url":"https://www.sec.gov/Archives/edgar/data/1018164/000090514826003886/form4.xml","form_type":"4"}},{"id":677939,"issuer":{"id":399,"kind":"organization","name":"WILLIS LEASE FINANCE CORP","symbol":"WLFC"},"owners":[{"id":400,"kind":"person","name":"WILLIS CHARLES F IV","position":1,"cik":"0001033309","reported_name":"WILLIS CHARLES F IV","relationship":{"director":true,"officer":true,"ten_percent_owner":true,"other":false,"officer_title":"Executive Chairman"}}],"security":"Common Stock","published_at":"2026-08-24T22:27:26.000Z","date":"2026-08-24","kind":"sale","planned":true,"acquired":false,"shares":3016,"price":54.5876,"value":164636.2016,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on May 18, 2026."},{"field":"price","element":"transactionPricePerShare","label":"F5","text":"This transaction was executed in multiple trades at prices ranging from $53.98 to $54.95, inclusive. The price reported reflects the weighted average sale price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares sold at each separate price within the range set forth in footnote (5) of this Form 4."}],"balance_after":2532827,"source":{"system":"sec-edgar","filing":"0000905148-26-003886","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":5,"url":"https://www.sec.gov/Archives/edgar/data/1018164/000090514826003886/form4.xml","form_type":"4"}},{"id":677938,"issuer":{"id":399,"kind":"organization","name":"WILLIS LEASE FINANCE CORP","symbol":"WLFC"},"owners":[{"id":400,"kind":"person","name":"WILLIS CHARLES F IV","position":1,"cik":"0001033309","reported_name":"WILLIS CHARLES F IV","relationship":{"director":true,"officer":true,"ten_percent_owner":true,"other":false,"officer_title":"Executive Chairman"}}],"security":"Common Stock","published_at":"2026-08-24T22:27:26.000Z","date":"2026-08-21","kind":"sale","planned":true,"acquired":false,"shares":1100,"price":54.7891,"value":60268.01,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on May 18, 2026."},{"field":"price","element":"transactionPricePerShare","label":"F4","text":"This transaction was executed in multiple trades at prices ranging from $54.73 to $54.87, inclusive. The price reported reflects the weighted average sale price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares sold at each separate price within the range set forth in footnote (4) of this Form 4."}],"balance_after":2535843,"source":{"system":"sec-edgar","filing":"0000905148-26-003886","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/1018164/000090514826003886/form4.xml","form_type":"4"}},{"id":677937,"issuer":{"id":399,"kind":"organization","name":"WILLIS LEASE FINANCE CORP","symbol":"WLFC"},"owners":[{"id":400,"kind":"person","name":"WILLIS CHARLES F IV","position":1,"cik":"0001033309","reported_name":"WILLIS CHARLES F IV","relationship":{"director":true,"officer":true,"ten_percent_owner":true,"other":false,"officer_title":"Executive Chairman"}}],"security":"Common Stock","published_at":"2026-08-24T22:27:26.000Z","date":"2026-08-21","kind":"sale","planned":true,"acquired":false,"shares":12400,"price":54.4412,"value":675070.88,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on May 18, 2026."},{"field":"price","element":"transactionPricePerShare","label":"F3","text":"This transaction was executed in multiple trades at prices ranging from $53.72 to $54.71, inclusive. The price reported reflects the weighted average sale price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares sold at each separate price within the range set forth in footnote (3) of this Form 4."}],"balance_after":2536943,"source":{"system":"sec-edgar","filing":"0000905148-26-003886","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1018164/000090514826003886/form4.xml","form_type":"4"}},{"id":677936,"issuer":{"id":399,"kind":"organization","name":"WILLIS LEASE FINANCE CORP","symbol":"WLFC"},"owners":[{"id":400,"kind":"person","name":"WILLIS CHARLES F IV","position":1,"cik":"0001033309","reported_name":"WILLIS CHARLES F IV","relationship":{"director":true,"officer":true,"ten_percent_owner":true,"other":false,"officer_title":"Executive Chairman"}}],"security":"Common Stock","published_at":"2026-08-24T22:27:26.000Z","date":"2026-08-20","kind":"sale","planned":true,"acquired":false,"shares":116,"price":54.66,"value":6340.56,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on May 18, 2026."}],"balance_after":2549343,"source":{"system":"sec-edgar","filing":"0000905148-26-003886","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1018164/000090514826003886/form4.xml","form_type":"4"}},{"id":677935,"issuer":{"id":399,"kind":"organization","name":"WILLIS LEASE FINANCE CORP","symbol":"WLFC"},"owners":[{"id":400,"kind":"person","name":"WILLIS CHARLES F IV","position":1,"cik":"0001033309","reported_name":"WILLIS CHARLES F IV","relationship":{"director":true,"officer":true,"ten_percent_owner":true,"other":false,"officer_title":"Executive Chairman"}}],"security":"Common Stock","published_at":"2026-08-24T22:27:26.000Z","date":"2026-08-20","kind":"sale","planned":true,"acquired":false,"shares":16184,"price":53.9772,"value":873567.0048,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on May 18, 2026."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"This transaction was executed in multiple trades at prices ranging from $53.40 to $54.32, inclusive. The price reported reflects the weighted average sale price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares sold at each separate price within the range set forth in footnote (2) of this Form 4."}],"balance_after":2549459,"source":{"system":"sec-edgar","filing":"0000905148-26-003886","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1018164/000090514826003886/form4.xml","form_type":"4"}},{"id":681984,"issuer":{"id":399,"kind":"organization","name":"WILLIS LEASE FINANCE CORP","symbol":"WLFC"},"owners":[{"id":400,"kind":"person","name":"WILLIS CHARLES F IV","position":1,"cik":"0001033309","reported_name":"WILLIS CHARLES F IV","relationship":{"director":true,"officer":true,"ten_percent_owner":true,"other":false,"officer_title":"Executive Chairman"}}],"security":"Common Stock","published_at":"2026-08-19T23:43:56.000Z","date":"2026-08-19","kind":"sale","planned":true,"acquired":false,"shares":4810,"price":57.2701,"value":275469.181,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F2","text":"The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on May 18, 2026."},{"field":"price","element":"transactionPricePerShare","label":"F11","text":"This transaction was executed in multiple trades at prices ranging from $57.03 to $57.95, inclusive. The price reported reflects the weighted average sale price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares sold at each separate price within the range set forth in footnote (11) of this Form 4."}],"balance_after":2565643,"source":{"system":"sec-edgar","filing":"0000905148-26-003820","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":9,"url":"https://www.sec.gov/Archives/edgar/data/1018164/000090514826003820/form4.xml","form_type":"4"}},{"id":681983,"issuer":{"id":399,"kind":"organization","name":"WILLIS LEASE FINANCE CORP","symbol":"WLFC"},"owners":[{"id":400,"kind":"person","name":"WILLIS CHARLES F IV","position":1,"cik":"0001033309","reported_name":"WILLIS CHARLES F IV","relationship":{"director":true,"officer":true,"ten_percent_owner":true,"other":false,"officer_title":"Executive Chairman"}}],"security":"Common Stock","published_at":"2026-08-19T23:43:56.000Z","date":"2026-08-19","kind":"sale","planned":true,"acquired":false,"shares":3133,"price":56.4812,"value":176955.5996,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F2","text":"The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on May 18, 2026."},{"field":"price","element":"transactionPricePerShare","label":"F10","text":"This transaction was executed in multiple trades at prices ranging from $56.00 to $56.99, inclusive. The price reported reflects the weighted average sale price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares sold at each separate price within the range set forth in footnote (10) of this Form 4."}],"balance_after":2570453,"source":{"system":"sec-edgar","filing":"0000905148-26-003820","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":8,"url":"https://www.sec.gov/Archives/edgar/data/1018164/000090514826003820/form4.xml","form_type":"4"}},{"id":681982,"issuer":{"id":399,"kind":"organization","name":"WILLIS LEASE FINANCE CORP","symbol":"WLFC"},"owners":[{"id":400,"kind":"person","name":"WILLIS CHARLES F IV","position":1,"cik":"0001033309","reported_name":"WILLIS CHARLES F IV","relationship":{"director":true,"officer":true,"ten_percent_owner":true,"other":false,"officer_title":"Executive Chairman"}}],"security":"Common Stock","published_at":"2026-08-19T23:43:56.000Z","date":"2026-08-19","kind":"sale","planned":true,"acquired":false,"shares":11357,"price":55.1137,"value":625926.2909,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F2","text":"The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on May 18, 2026."},{"field":"price","element":"transactionPricePerShare","label":"F9","text":"This transaction was executed in multiple trades at prices ranging from $54.87 to $55.37, inclusive. The price reported reflects the weighted average sale price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares sold at each separate price within the range set forth in footnote (9) of this Form 4."}],"balance_after":2573586,"source":{"system":"sec-edgar","filing":"0000905148-26-003820","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":7,"url":"https://www.sec.gov/Archives/edgar/data/1018164/000090514826003820/form4.xml","form_type":"4"}},{"id":681981,"issuer":{"id":399,"kind":"organization","name":"WILLIS LEASE FINANCE CORP","symbol":"WLFC"},"owners":[{"id":400,"kind":"person","name":"WILLIS CHARLES F IV","position":1,"cik":"0001033309","reported_name":"WILLIS CHARLES F IV","relationship":{"director":true,"officer":true,"ten_percent_owner":true,"other":false,"officer_title":"Executive Chairman"}}],"security":"Common Stock","published_at":"2026-08-19T23:43:56.000Z","date":"2026-08-18","kind":"sale","planned":true,"acquired":false,"shares":8535,"price":58.192,"value":496668.72,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F2","text":"The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on May 18, 2026."},{"field":"price","element":"transactionPricePerShare","label":"F8","text":"This transaction was executed in multiple trades at prices ranging from $58.04 to $58.48, inclusive. The price reported reflects the weighted average sale price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares sold at each separate price within the range set forth in footnote (8) of this Form 4."}],"balance_after":2584943,"source":{"system":"sec-edgar","filing":"0000905148-26-003820","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":6,"url":"https://www.sec.gov/Archives/edgar/data/1018164/000090514826003820/form4.xml","form_type":"4"}},{"id":681980,"issuer":{"id":399,"kind":"organization","name":"WILLIS LEASE FINANCE CORP","symbol":"WLFC"},"owners":[{"id":400,"kind":"person","name":"WILLIS CHARLES F IV","position":1,"cik":"0001033309","reported_name":"WILLIS CHARLES F IV","relationship":{"director":true,"officer":true,"ten_percent_owner":true,"other":false,"officer_title":"Executive Chairman"}}],"security":"Common Stock","published_at":"2026-08-19T23:43:56.000Z","date":"2026-08-18","kind":"sale","planned":true,"acquired":false,"shares":12480,"price":57.4576,"value":717070.848,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F2","text":"The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on May 18, 2026."},{"field":"price","element":"transactionPricePerShare","label":"F7","text":"This transaction was executed in multiple trades at prices ranging from $57.015 to $57.99, inclusive. The price reported reflects the weighted average sale price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares sold at each separate price within the range set forth in footnote (7) of this Form 4."}],"balance_after":2593478,"source":{"system":"sec-edgar","filing":"0000905148-26-003820","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":5,"url":"https://www.sec.gov/Archives/edgar/data/1018164/000090514826003820/form4.xml","form_type":"4"}},{"id":681979,"issuer":{"id":399,"kind":"organization","name":"WILLIS LEASE FINANCE CORP","symbol":"WLFC"},"owners":[{"id":400,"kind":"person","name":"WILLIS CHARLES F IV","position":1,"cik":"0001033309","reported_name":"WILLIS CHARLES F IV","relationship":{"director":true,"officer":true,"ten_percent_owner":true,"other":false,"officer_title":"Executive Chairman"}}],"security":"Common Stock","published_at":"2026-08-19T23:43:56.000Z","date":"2026-08-18","kind":"sale","planned":true,"acquired":false,"shares":6485,"price":56.61,"value":367115.85,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F2","text":"The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on May 18, 2026."},{"field":"price","element":"transactionPricePerShare","label":"F6","text":"This transaction was executed in multiple trades at prices ranging from $56.01 to $57.00, inclusive. The price reported reflects the weighted average sale price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares sold at each separate price within the range set forth in footnote (6) of this Form 4."}],"balance_after":2605958,"source":{"system":"sec-edgar","filing":"0000905148-26-003820","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/1018164/000090514826003820/form4.xml","form_type":"4"}},{"id":681978,"issuer":{"id":399,"kind":"organization","name":"WILLIS LEASE FINANCE CORP","symbol":"WLFC"},"owners":[{"id":400,"kind":"person","name":"WILLIS CHARLES F IV","position":1,"cik":"0001033309","reported_name":"WILLIS CHARLES F IV","relationship":{"director":true,"officer":true,"ten_percent_owner":true,"other":false,"officer_title":"Executive Chairman"}}],"security":"Common Stock","published_at":"2026-08-19T23:43:56.000Z","date":"2026-08-17","kind":"sale","planned":true,"acquired":false,"shares":1778,"price":58.8532,"value":104640.9896,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F2","text":"The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on May 18, 2026."},{"field":"price","element":"transactionPricePerShare","label":"F5","text":"This transaction was executed in multiple trades at prices ranging from $58.81 to $58.90, inclusive. The price reported reflects the weighted average sale price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares sold at each separate price within the range set forth in footnote (5) of this Form 4."}],"balance_after":2612443,"source":{"system":"sec-edgar","filing":"0000905148-26-003820","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1018164/000090514826003820/form4.xml","form_type":"4"}},{"id":681977,"issuer":{"id":399,"kind":"organization","name":"WILLIS LEASE FINANCE CORP","symbol":"WLFC"},"owners":[{"id":400,"kind":"person","name":"WILLIS CHARLES F IV","position":1,"cik":"0001033309","reported_name":"WILLIS CHARLES F IV","relationship":{"director":true,"officer":true,"ten_percent_owner":true,"other":false,"officer_title":"Executive Chairman"}}],"security":"Common Stock","published_at":"2026-08-19T23:43:56.000Z","date":"2026-08-17","kind":"sale","planned":true,"acquired":false,"shares":13590,"price":58.3824,"value":793416.816,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F2","text":"The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on May 18, 2026."},{"field":"price","element":"transactionPricePerShare","label":"F4","text":"This transaction was executed in multiple trades at prices ranging from $57.81 to $58.80, inclusive. The price reported reflects the weighted average sale price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares sold at each separate price within the range set forth in footnote (4) of this Form 4."}],"balance_after":2614221,"source":{"system":"sec-edgar","filing":"0000905148-26-003820","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1018164/000090514826003820/form4.xml","form_type":"4"}},{"id":681976,"issuer":{"id":399,"kind":"organization","name":"WILLIS LEASE FINANCE CORP","symbol":"WLFC"},"owners":[{"id":400,"kind":"person","name":"WILLIS CHARLES F IV","position":1,"cik":"0001033309","reported_name":"WILLIS CHARLES F IV","relationship":{"director":true,"officer":true,"ten_percent_owner":true,"other":false,"officer_title":"Executive Chairman"}}],"security":"Common Stock","published_at":"2026-08-19T23:43:56.000Z","date":"2026-08-17","kind":"sale","planned":true,"acquired":false,"shares":16032,"price":57.4485,"value":921014.352,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F2","text":"The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on May 18, 2026."},{"field":"price","element":"transactionPricePerShare","label":"F3","text":"This transaction was executed in multiple trades at prices ranging from $56.80 to $57.75, inclusive. The price reported reflects the weighted average sale price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares sold at each separate price within the range set forth in footnote (3) of this Form 4."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F1","text":"These numbers have been adjusted to reflect the 3-for-1 forward stock split, which became effective on July 21, 2026 (the \"Stock Split\")."}],"balance_after":2627811,"source":{"system":"sec-edgar","filing":"0000905148-26-003820","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1018164/000090514826003820/form4.xml","form_type":"4"}},{"id":686021,"issuer":{"id":399,"kind":"organization","name":"WILLIS LEASE FINANCE CORP","symbol":"WLFC"},"owners":[{"id":23058,"kind":"person","name":"Dameron Clifton","position":1,"cik":"0002070403","reported_name":"Dameron Clifton","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"SVP, GC & Corporate Secretary"}}],"security":"Common Stock","published_at":"2026-08-17T13:35:23.000Z","date":"2026-08-14","kind":"sale","planned":false,"acquired":false,"shares":3535,"price":56.83,"value":200894.05,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"This transaction was executed in one trade at the price of $56.8266. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer of a security holder of the issuer full information regarding the number of shares and prices at which the transaction was affected."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"The number of securities beneficially owned reported herein has been adjusted to reflect the 3-for-1 forward stock split, which became effective on July 21, 2026."}],"balance_after":39458,"source":{"system":"sec-edgar","filing":"0002070403-26-000013","document":"wk-form4_1786973720.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1018164/000207040326000013/wk-form4_1786973720.xml","form_type":"4"}},{"id":696205,"issuer":{"id":399,"kind":"organization","name":"WILLIS LEASE FINANCE CORP","symbol":"WLFC"},"owners":[{"id":1819,"kind":"person","name":"Willis Austin Chandler","position":1,"cik":"0001453104","reported_name":"Willis Austin Chandler","relationship":{"director":true,"officer":true,"ten_percent_owner":true,"other":false,"officer_title":"President and CEO"}}],"security":"Common Stock","published_at":"2026-08-05T20:15:59.000Z","date":"2026-08-03","kind":"sale","planned":true,"acquired":false,"shares":9363,"price":73.6832,"value":689895.8016,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F2","text":"The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on March 24, 2026."},{"field":"price","element":"transactionPricePerShare","label":"F4","text":"This transaction was executed in multiple trades at prices ranging from $73.39 to $74.106, inclusive. The price reported reflects the weighted average sale price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares sold at each separate price within the range set forth in footnote (4) of this Form 4."}],"balance_after":435888,"source":{"system":"sec-edgar","filing":"0000905148-26-003482","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1018164/000090514826003482/form4.xml","form_type":"4"}},{"id":696204,"issuer":{"id":399,"kind":"organization","name":"WILLIS LEASE FINANCE CORP","symbol":"WLFC"},"owners":[{"id":1819,"kind":"person","name":"Willis Austin Chandler","position":1,"cik":"0001453104","reported_name":"Willis Austin Chandler","relationship":{"director":true,"officer":true,"ten_percent_owner":true,"other":false,"officer_title":"President and CEO"}}],"security":"Common Stock","published_at":"2026-08-05T20:15:59.000Z","date":"2026-08-03","kind":"sale","planned":true,"acquired":false,"shares":5637,"price":72.7705,"value":410207.3085,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F2","text":"The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on March 24, 2026."},{"field":"price","element":"transactionPricePerShare","label":"F3","text":"This transaction was executed in multiple trades at prices ranging from $72.38 to $73.3697, inclusive. The price reported reflects the weighted average sale price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares sold at each separate price within the range set forth in footnote (3) of this Form 4."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F1","text":"These numbers have been adjusted to reflect the 3-for-1 forward stock split, which became effective on July 21, 2026 (the \"Stock Split\")."}],"balance_after":445251,"source":{"system":"sec-edgar","filing":"0000905148-26-003482","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1018164/000090514826003482/form4.xml","form_type":"4"}},{"id":699250,"issuer":{"id":399,"kind":"organization","name":"WILLIS LEASE FINANCE CORP","symbol":"WLFC"},"owners":[{"id":27292,"kind":"person","name":"Flaherty Scott B.","position":1,"cik":"0001676532","reported_name":"Flaherty Scott B.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP, CFO"}}],"security":"Common Stock","published_at":"2026-08-03T18:06:32.000Z","date":"2026-07-31","kind":"purchase","planned":false,"acquired":true,"shares":148,"price":29.07,"value":4302.36,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Shares acquired pursuant to employee's participation in the Company's ESPP."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"The number of securities beneficially owned reported herein has been adjusted to reflect the 3-for-1 forward stock split, which became effective on July 21, 2026."}],"balance_after":244324,"source":{"system":"sec-edgar","filing":"0001676532-26-000010","document":"wk-form4_1785780390.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1018164/000167653226000010/wk-form4_1785780390.xml","form_type":"4"}},{"id":716181,"issuer":{"id":399,"kind":"organization","name":"WILLIS LEASE FINANCE CORP","symbol":"WLFC"},"owners":[{"id":1819,"kind":"person","name":"Willis Austin Chandler","position":1,"cik":"0001453104","reported_name":"Willis Austin Chandler","relationship":{"director":true,"officer":true,"ten_percent_owner":true,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Common Stock","published_at":"2026-07-06T20:15:18.000Z","date":"2026-07-01","kind":"sale","planned":true,"acquired":false,"shares":236,"price":229.53,"value":54169.08,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on March 24, 2026."}],"balance_after":150296,"source":{"system":"sec-edgar","filing":"0000905148-26-003170","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":8,"url":"https://www.sec.gov/Archives/edgar/data/1018164/000090514826003170/form4.xml","form_type":"4"}},{"id":716180,"issuer":{"id":399,"kind":"organization","name":"WILLIS LEASE FINANCE CORP","symbol":"WLFC"},"owners":[{"id":1819,"kind":"person","name":"Willis Austin Chandler","position":1,"cik":"0001453104","reported_name":"Willis Austin Chandler","relationship":{"director":true,"officer":true,"ten_percent_owner":true,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Common Stock","published_at":"2026-07-06T20:15:18.000Z","date":"2026-07-01","kind":"sale","planned":true,"acquired":false,"shares":1100,"price":227.9898,"value":250788.78,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on March 24, 2026."},{"field":"price","element":"transactionPricePerShare","label":"F7","text":"This transaction was executed in multiple trades at prices ranging from $227.64 to $228.42, inclusive. The price reported reflects the weighted average sale price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares sold at each separate price within the range set forth in footnote (7) of this Form 4."}],"balance_after":150532,"source":{"system":"sec-edgar","filing":"0000905148-26-003170","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":7,"url":"https://www.sec.gov/Archives/edgar/data/1018164/000090514826003170/form4.xml","form_type":"4"}},{"id":716179,"issuer":{"id":399,"kind":"organization","name":"WILLIS LEASE FINANCE CORP","symbol":"WLFC"},"owners":[{"id":1819,"kind":"person","name":"Willis Austin Chandler","position":1,"cik":"0001453104","reported_name":"Willis Austin Chandler","relationship":{"director":true,"officer":true,"ten_percent_owner":true,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Common Stock","published_at":"2026-07-06T20:15:18.000Z","date":"2026-07-01","kind":"sale","planned":true,"acquired":false,"shares":248,"price":227.2126,"value":56348.7248,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on March 24, 2026."},{"field":"price","element":"transactionPricePerShare","label":"F6","text":"This transaction was executed in multiple trades at prices ranging from $226.64 to $227.35, inclusive. The price reported reflects the weighted average sale price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares sold at each separate price within the range set forth in footnote (6) of this Form 4."}],"balance_after":151632,"source":{"system":"sec-edgar","filing":"0000905148-26-003170","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":6,"url":"https://www.sec.gov/Archives/edgar/data/1018164/000090514826003170/form4.xml","form_type":"4"}},{"id":716178,"issuer":{"id":399,"kind":"organization","name":"WILLIS LEASE FINANCE CORP","symbol":"WLFC"},"owners":[{"id":1819,"kind":"person","name":"Willis Austin Chandler","position":1,"cik":"0001453104","reported_name":"Willis Austin Chandler","relationship":{"director":true,"officer":true,"ten_percent_owner":true,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Common Stock","published_at":"2026-07-06T20:15:18.000Z","date":"2026-07-01","kind":"sale","planned":true,"acquired":false,"shares":200,"price":225.09,"value":45018.0,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on March 24, 2026."}],"balance_after":151880,"source":{"system":"sec-edgar","filing":"0000905148-26-003170","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":5,"url":"https://www.sec.gov/Archives/edgar/data/1018164/000090514826003170/form4.xml","form_type":"4"}},{"id":716177,"issuer":{"id":399,"kind":"organization","name":"WILLIS LEASE FINANCE CORP","symbol":"WLFC"},"owners":[{"id":1819,"kind":"person","name":"Willis Austin Chandler","position":1,"cik":"0001453104","reported_name":"Willis Austin Chandler","relationship":{"director":true,"officer":true,"ten_percent_owner":true,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Common Stock","published_at":"2026-07-06T20:15:18.000Z","date":"2026-07-01","kind":"sale","planned":true,"acquired":false,"shares":500,"price":223.912,"value":111956.0,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on March 24, 2026."},{"field":"price","element":"transactionPricePerShare","label":"F5","text":"This transaction was executed in multiple trades at prices ranging from $223.41 to $224.21, inclusive. The price reported reflects the weighted average sale price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares sold at each separate price within the range set forth in footnote (5) of this Form 4."}],"balance_after":152080,"source":{"system":"sec-edgar","filing":"0000905148-26-003170","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/1018164/000090514826003170/form4.xml","form_type":"4"}},{"id":716176,"issuer":{"id":399,"kind":"organization","name":"WILLIS LEASE FINANCE CORP","symbol":"WLFC"},"owners":[{"id":1819,"kind":"person","name":"Willis Austin Chandler","position":1,"cik":"0001453104","reported_name":"Willis Austin Chandler","relationship":{"director":true,"officer":true,"ten_percent_owner":true,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Common Stock","published_at":"2026-07-06T20:15:18.000Z","date":"2026-07-01","kind":"sale","planned":true,"acquired":false,"shares":700,"price":222.7057,"value":155893.99,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on March 24, 2026."},{"field":"price","element":"transactionPricePerShare","label":"F4","text":"This transaction was executed in multiple trades at prices ranging from $222.40 to $223.28, inclusive. The price reported reflects the weighted average sale price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares sold at each separate price within the range set forth in footnote (4) of this Form 4."}],"balance_after":152580,"source":{"system":"sec-edgar","filing":"0000905148-26-003170","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1018164/000090514826003170/form4.xml","form_type":"4"}},{"id":716175,"issuer":{"id":399,"kind":"organization","name":"WILLIS LEASE FINANCE CORP","symbol":"WLFC"},"owners":[{"id":1819,"kind":"person","name":"Willis Austin Chandler","position":1,"cik":"0001453104","reported_name":"Willis Austin Chandler","relationship":{"director":true,"officer":true,"ten_percent_owner":true,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Common Stock","published_at":"2026-07-06T20:15:18.000Z","date":"2026-07-01","kind":"sale","planned":true,"acquired":false,"shares":1700,"price":221.8071,"value":377072.07,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on March 24, 2026."},{"field":"price","element":"transactionPricePerShare","label":"F3","text":"This transaction was executed in multiple trades at prices ranging from $221.34 to $222.22, inclusive. The price reported reflects the weighted average sale price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares sold at each separate price within the range set forth in footnote (3) of this Form 4."}],"balance_after":153280,"source":{"system":"sec-edgar","filing":"0000905148-26-003170","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1018164/000090514826003170/form4.xml","form_type":"4"}},{"id":716174,"issuer":{"id":399,"kind":"organization","name":"WILLIS LEASE FINANCE CORP","symbol":"WLFC"},"owners":[{"id":1819,"kind":"person","name":"Willis Austin Chandler","position":1,"cik":"0001453104","reported_name":"Willis Austin Chandler","relationship":{"director":true,"officer":true,"ten_percent_owner":true,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Common Stock","published_at":"2026-07-06T20:15:18.000Z","date":"2026-07-01","kind":"sale","planned":true,"acquired":false,"shares":500,"price":220.618,"value":110309.0,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on March 24, 2026."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"This transaction was executed in multiple trades at prices ranging from $220.30 to $220.73, inclusive. The price reported reflects the weighted average sale price. 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Performance-based vesting criteria, which included a combination of profitability of the Issuer's services businesses, growth of the Issuer's leasing portfolio and the viability of the Issuer's Sustainable Aviation Fuel initiative, were certified on March 16, 2026. Each PSA represents a contingent right to receive one share of the Issuer's common stock upon vesting."},{"field":"shares","element":"transactionShares","label":"F5","text":"Reported amount has been adjusted to reflect the actual number of PSAs earned, based on the extent to which the performance-based vesting criteria were achieved. The remaining 9,212 PSAs of the 100% target amount reported in the Form 4 filed by the Reporting Person on January 6, 2025 were forfeited."},{"field":"price","element":"transactionPricePerShare","label":"F1","text":"Performance-based restricted stock award (\"PSA\") granted in 2025 subject to performance-based and time-based vesting over two years. Performance-based vesting criteria, which included a combination of profitability of the Issuer's services businesses, growth of the Issuer's leasing portfolio and the viability of the Issuer's Sustainable Aviation Fuel initiative, were certified on March 16, 2026. Each PSA represents a contingent right to receive one share of the Issuer's common stock upon vesting."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"Performance-based restricted stock award (\"PSA\") granted in 2025 subject to performance-based and time-based vesting over two years. Performance-based vesting criteria, which included a combination of profitability of the Issuer's services businesses, growth of the Issuer's leasing portfolio and the viability of the Issuer's Sustainable Aviation Fuel initiative, were certified on March 16, 2026. Each PSA represents a contingent right to receive one share of the Issuer's common stock upon vesting."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F1","text":"Performance-based restricted stock award (\"PSA\") granted in 2025 subject to performance-based and time-based vesting over two years. Performance-based vesting criteria, which included a combination of profitability of the Issuer's services businesses, growth of the Issuer's leasing portfolio and the viability of the Issuer's Sustainable Aviation Fuel initiative, were certified on March 16, 2026. Each PSA represents a contingent right to receive one share of the Issuer's common stock upon vesting."},{"field":"derivative.underlying_shares","element":"underlyingSecurityShares","label":"F5","text":"Reported amount has been adjusted to reflect the actual number of PSAs earned, based on the extent to which the performance-based vesting criteria were achieved. The remaining 9,212 PSAs of the 100% target amount reported in the Form 4 filed by the Reporting Person on January 6, 2025 were forfeited."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F5","text":"Reported amount has been adjusted to reflect the actual number of PSAs earned, based on the extent to which the performance-based vesting criteria were achieved. 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Performance-based vesting criteria, which included a combination of profitability of the Issuer's services businesses, growth of the Issuer's leasing portfolio and the viability of the Issuer's Sustainable Aviation Fuel initiative, were certified on March 16, 2026. Each PSA represents a contingent right to receive one share of the Issuer's common stock upon vesting."},{"field":"shares","element":"transactionShares","label":"F11","text":"Reported amount has been adjusted to reflect the actual number of PSAs earned, based on the extent to which the performance-based vesting criteria were achieved. The remaining 5,343 PSAs of the 100% target amount reported in the Form 4 filed by the Reporting Person on January 6, 2025 were forfeited."},{"field":"price","element":"transactionPricePerShare","label":"F1","text":"Performance-based restricted stock award (\"PSA\") granted in 2025 subject to performance-based and time-based vesting over two years. 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Each PSA represents a contingent right to receive one share of the Issuer's common stock upon vesting."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F1","text":"Performance-based restricted stock award (\"PSA\") granted in 2025 subject to performance-based and time-based vesting over two years. Performance-based vesting criteria, which included a combination of profitability of the Issuer's services businesses, growth of the Issuer's leasing portfolio and the viability of the Issuer's Sustainable Aviation Fuel initiative, were certified on March 16, 2026. Each PSA represents a contingent right to receive one share of the Issuer's common stock upon vesting."},{"field":"derivative.underlying_shares","element":"underlyingSecurityShares","label":"F11","text":"Reported amount has been adjusted to reflect the actual number of PSAs earned, based on the extent to which the performance-based vesting criteria were achieved. The remaining 5,343 PSAs of the 100% target amount reported in the Form 4 filed by the Reporting Person on January 6, 2025 were forfeited."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F11","text":"Reported amount has been adjusted to reflect the actual number of PSAs earned, based on the extent to which the performance-based vesting criteria were achieved. The remaining 5,343 PSAs of the 100% target amount reported in the Form 4 filed by the Reporting Person on January 6, 2025 were forfeited."}],"balance_after":0,"derivative":{"underlying":"Common Stock","underlying_shares":6315},"source":{"system":"sec-edgar","filing":"0000905148-26-001385","document":"form4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":10,"url":"https://www.sec.gov/Archives/edgar/data/1018164/000090514826001385/form4.xml","form_type":"4"}},{"id":835815,"issuer":{"id":399,"kind":"organization","name":"WILLIS LEASE FINANCE CORP","symbol":"WLFC"},"owners":[{"id":1819,"kind":"person","name":"Willis Austin Chandler","position":1,"cik":"0001453104","reported_name":"Willis Austin Chandler","relationship":{"director":true,"officer":true,"ten_percent_owner":true,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Common Stock","published_at":"2026-03-18T20:15:34.000Z","date":"2026-03-16","kind":"tax_withholding","planned":false,"acquired":false,"shares":785,"price":167.18,"value":131236.3,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F2","text":"Return to Issuer of previously restricted shares to satisfy withholding tax liability."}],"balance_after":186876,"source":{"system":"sec-edgar","filing":"0000905148-26-001385","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1018164/000090514826001385/form4.xml","form_type":"4"}},{"id":835814,"issuer":{"id":399,"kind":"organization","name":"WILLIS LEASE FINANCE CORP","symbol":"WLFC"},"owners":[{"id":1819,"kind":"person","name":"Willis Austin Chandler","position":1,"cik":"0001453104","reported_name":"Willis Austin Chandler","relationship":{"director":true,"officer":true,"ten_percent_owner":true,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Common Stock","published_at":"2026-03-18T20:15:34.000Z","date":"2026-03-16","kind":"exercise","planned":false,"acquired":true,"shares":6315,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Performance-based restricted stock award (\"PSA\") granted in 2025 subject to performance-based and time-based vesting over two years. 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Performance-based vesting criteria, which included a combination of profitability of the Issuer's services businesses, growth of the Issuer's leasing portfolio and the viability of the Issuer's Sustainable Aviation Fuel initiative, were certified on March 16, 2026. Each PSA represents a contingent right to receive one share of the Issuer's common stock upon vesting."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"Performance-based restricted stock award (\"PSA\") granted in 2025 subject to performance-based and time-based vesting over two years. Performance-based vesting criteria, which included a combination of profitability of the Issuer's services businesses, growth of the Issuer's leasing portfolio and the viability of the Issuer's Sustainable Aviation Fuel initiative, were certified on March 16, 2026. Each PSA represents a contingent right to receive one share of the Issuer's common stock upon vesting."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F1","text":"Performance-based restricted stock award (\"PSA\") granted in 2025 subject to performance-based and time-based vesting over two years. Performance-based vesting criteria, which included a combination of profitability of the Issuer's services businesses, growth of the Issuer's leasing portfolio and the viability of the Issuer's Sustainable Aviation Fuel initiative, were certified on March 16, 2026. Each PSA represents a contingent right to receive one share of the Issuer's common stock upon vesting."},{"field":"derivative.underlying_shares","element":"underlyingSecurityShares","label":"F3","text":"Reported amount has been adjusted to reflect the actual number of PSAs earned, based on the extent to which the performance-based vesting criteria were achieved. The remaining 2,856 PSAs of the 100% target amount reported in the Form 4 filed by the Reporting Person on January 6, 2025 were forfeited."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"Reported amount has been adjusted to reflect the actual number of PSAs earned, based on the extent to which the performance-based vesting criteria were achieved. 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Performance-based vesting criteria, which included a combination of profitability of the Issuer's services businesses, growth of the Issuer's leasing portfolio and the viability of the Issuer's Sustainable Aviation Fuel initiative, were certified on March 16, 2026. Each PSA represents a contingent right to receive one share of the Issuer's common stock upon vesting."},{"field":"shares","element":"transactionShares","label":"F3","text":"Reported amount has been adjusted to reflect the actual number of PSAs earned, based on the extent to which the performance-based vesting criteria were achieved. The remaining 2,229 PSAs of the 100% target amount reported in the Form 4 filed by the Reporting Person on January 6, 2025 were forfeited."},{"field":"price","element":"transactionPricePerShare","label":"F1","text":"Performance-based restricted stock award (\"PSA\") granted in 2025 subject to performance-based and time-based vesting over two years. Performance-based vesting criteria, which included a combination of profitability of the Issuer's services businesses, growth of the Issuer's leasing portfolio and the viability of the Issuer's Sustainable Aviation Fuel initiative, were certified on March 16, 2026. Each PSA represents a contingent right to receive one share of the Issuer's common stock upon vesting."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"Performance-based restricted stock award (\"PSA\") granted in 2025 subject to performance-based and time-based vesting over two years. Performance-based vesting criteria, which included a combination of profitability of the Issuer's services businesses, growth of the Issuer's leasing portfolio and the viability of the Issuer's Sustainable Aviation Fuel initiative, were certified on March 16, 2026. Each PSA represents a contingent right to receive one share of the Issuer's common stock upon vesting."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F1","text":"Performance-based restricted stock award (\"PSA\") granted in 2025 subject to performance-based and time-based vesting over two years. Performance-based vesting criteria, which included a combination of profitability of the Issuer's services businesses, growth of the Issuer's leasing portfolio and the viability of the Issuer's Sustainable Aviation Fuel initiative, were certified on March 16, 2026. Each PSA represents a contingent right to receive one share of the Issuer's common stock upon vesting."},{"field":"derivative.underlying_shares","element":"underlyingSecurityShares","label":"F3","text":"Reported amount has been adjusted to reflect the actual number of PSAs earned, based on the extent to which the performance-based vesting criteria were achieved. The remaining 2,229 PSAs of the 100% target amount reported in the Form 4 filed by the Reporting Person on January 6, 2025 were forfeited."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"Reported amount has been adjusted to reflect the actual number of PSAs earned, based on the extent to which the performance-based vesting criteria were achieved. The remaining 2,229 PSAs of the 100% target amount reported in the Form 4 filed by the Reporting Person on January 6, 2025 were forfeited."}],"balance_after":0,"derivative":{"underlying":"Common Stock","underlying_shares":2635},"source":{"system":"sec-edgar","filing":"0002070403-26-000009","document":"wk-form4_1773846747.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1018164/000207040326000009/wk-form4_1773846747.xml","form_type":"4"}},{"id":835809,"issuer":{"id":399,"kind":"organization","name":"WILLIS LEASE FINANCE CORP","symbol":"WLFC"},"owners":[{"id":23058,"kind":"person","name":"Dameron Clifton","position":1,"cik":"0002070403","reported_name":"Dameron Clifton","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"SVP, GC & Corporate Secretary"}}],"security":"Common Stock","published_at":"2026-03-18T15:12:30.000Z","date":"2026-03-16","kind":"tax_withholding","planned":false,"acquired":false,"shares":213,"price":167.18,"value":35609.34,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F2","text":"Return to Issuer of previously restricted shares to satisfy withholding tax liability."}],"balance_after":14943,"source":{"system":"sec-edgar","filing":"0002070403-26-000009","document":"wk-form4_1773846747.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1018164/000207040326000009/wk-form4_1773846747.xml","form_type":"4"}},{"id":835808,"issuer":{"id":399,"kind":"organization","name":"WILLIS LEASE FINANCE CORP","symbol":"WLFC"},"owners":[{"id":23058,"kind":"person","name":"Dameron Clifton","position":1,"cik":"0002070403","reported_name":"Dameron Clifton","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"SVP, GC & Corporate Secretary"}}],"security":"Common Stock","published_at":"2026-03-18T15:12:30.000Z","date":"2026-03-16","kind":"exercise","planned":false,"acquired":true,"shares":2635,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Performance-based restricted stock award (\"PSA\") granted in 2025 subject to performance-based and time-based vesting over two years. Performance-based vesting criteria, which included a combination of profitability of the Issuer's services businesses, growth of the Issuer's leasing portfolio and the viability of the Issuer's Sustainable Aviation Fuel initiative, were certified on March 16, 2026. Each PSA represents a contingent right to receive one share of the Issuer's common stock upon vesting."},{"field":"price","element":"transactionPricePerShare","label":"F1","text":"Performance-based restricted stock award (\"PSA\") granted in 2025 subject to performance-based and time-based vesting over two years. Performance-based vesting criteria, which included a combination of profitability of the Issuer's services businesses, growth of the Issuer's leasing portfolio and the viability of the Issuer's Sustainable Aviation Fuel initiative, were certified on March 16, 2026. Each PSA represents a contingent right to receive one share of the Issuer's common stock upon vesting."}],"balance_after":15156,"source":{"system":"sec-edgar","filing":"0002070403-26-000009","document":"wk-form4_1773846747.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1018164/000207040326000009/wk-form4_1773846747.xml","form_type":"4"}},{"id":863123,"issuer":{"id":399,"kind":"organization","name":"WILLIS LEASE FINANCE CORP","symbol":"WLFC"},"owners":[{"id":1819,"kind":"person","name":"Willis Austin Chandler","position":1,"cik":"0001453104","reported_name":"Willis Austin Chandler","relationship":{"director":true,"officer":true,"ten_percent_owner":true,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Common Stock","published_at":"2026-03-04T21:15:40.000Z","date":"2026-03-02","kind":"sale","planned":true,"acquired":false,"shares":40,"price":200.89,"value":8035.6,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on June 3, 2025."}],"balance_after":181346,"source":{"system":"sec-edgar","filing":"0000905148-26-001141","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":7,"url":"https://www.sec.gov/Archives/edgar/data/1018164/000090514826001141/form4.xml","form_type":"4"}},{"id":863122,"issuer":{"id":399,"kind":"organization","name":"WILLIS LEASE FINANCE CORP","symbol":"WLFC"},"owners":[{"id":1819,"kind":"person","name":"Willis Austin Chandler","position":1,"cik":"0001453104","reported_name":"Willis Austin Chandler","relationship":{"director":true,"officer":true,"ten_percent_owner":true,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Common Stock","published_at":"2026-03-04T21:15:40.000Z","date":"2026-03-02","kind":"sale","planned":true,"acquired":false,"shares":100,"price":199.77,"value":19977.0,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on June 3, 2025."}],"balance_after":181386,"source":{"system":"sec-edgar","filing":"0000905148-26-001141","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":6,"url":"https://www.sec.gov/Archives/edgar/data/1018164/000090514826001141/form4.xml","form_type":"4"}},{"id":863121,"issuer":{"id":399,"kind":"organization","name":"WILLIS LEASE FINANCE CORP","symbol":"WLFC"},"owners":[{"id":1819,"kind":"person","name":"Willis Austin Chandler","position":1,"cik":"0001453104","reported_name":"Willis Austin Chandler","relationship":{"director":true,"officer":true,"ten_percent_owner":true,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Common Stock","published_at":"2026-03-04T21:15:40.000Z","date":"2026-03-02","kind":"sale","planned":true,"acquired":false,"shares":200,"price":198.51,"value":39702.0,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on June 3, 2025."}],"balance_after":181486,"source":{"system":"sec-edgar","filing":"0000905148-26-001141","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":5,"url":"https://www.sec.gov/Archives/edgar/data/1018164/000090514826001141/form4.xml","form_type":"4"}},{"id":863120,"issuer":{"id":399,"kind":"organization","name":"WILLIS LEASE FINANCE CORP","symbol":"WLFC"},"owners":[{"id":1819,"kind":"person","name":"Willis Austin Chandler","position":1,"cik":"0001453104","reported_name":"Willis Austin Chandler","relationship":{"director":true,"officer":true,"ten_percent_owner":true,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Common Stock","published_at":"2026-03-04T21:15:40.000Z","date":"2026-03-02","kind":"sale","planned":true,"acquired":false,"shares":400,"price":197.5944,"value":79037.76,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on June 3, 2025."},{"field":"price","element":"transactionPricePerShare","label":"F5","text":"This transaction was executed in multiple trades at prices ranging from $197.0575 to $197.78, inclusive. The price reported reflects the weighted average sale price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares sold at each separate price within the range set forth in footnote (5) of this Form 4."}],"balance_after":181686,"source":{"system":"sec-edgar","filing":"0000905148-26-001141","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/1018164/000090514826001141/form4.xml","form_type":"4"}},{"id":863119,"issuer":{"id":399,"kind":"organization","name":"WILLIS LEASE FINANCE CORP","symbol":"WLFC"},"owners":[{"id":1819,"kind":"person","name":"Willis Austin Chandler","position":1,"cik":"0001453104","reported_name":"Willis Austin Chandler","relationship":{"director":true,"officer":true,"ten_percent_owner":true,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Common Stock","published_at":"2026-03-04T21:15:40.000Z","date":"2026-03-02","kind":"sale","planned":true,"acquired":false,"shares":647,"price":196.6329,"value":127221.4863,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on June 3, 2025."},{"field":"price","element":"transactionPricePerShare","label":"F4","text":"This transaction was executed in multiple trades at prices ranging from $196.05 to $197.01, inclusive. The price reported reflects the weighted average sale price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares sold at each separate price within the range set forth in footnote (4) of this Form 4."}],"balance_after":182086,"source":{"system":"sec-edgar","filing":"0000905148-26-001141","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1018164/000090514826001141/form4.xml","form_type":"4"}},{"id":863118,"issuer":{"id":399,"kind":"organization","name":"WILLIS LEASE FINANCE CORP","symbol":"WLFC"},"owners":[{"id":1819,"kind":"person","name":"Willis Austin Chandler","position":1,"cik":"0001453104","reported_name":"Willis Austin Chandler","relationship":{"director":true,"officer":true,"ten_percent_owner":true,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Common Stock","published_at":"2026-03-04T21:15:40.000Z","date":"2026-03-02","kind":"sale","planned":true,"acquired":false,"shares":1052,"price":195.0868,"value":205231.3136,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on June 3, 2025."},{"field":"price","element":"transactionPricePerShare","label":"F3","text":"This transaction was executed in multiple trades at prices ranging from $195.01 to $195.72, inclusive. The price reported reflects the weighted average sale price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares sold at each separate price within the range set forth in footnote (3) of this Form 4."}],"balance_after":182733,"source":{"system":"sec-edgar","filing":"0000905148-26-001141","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1018164/000090514826001141/form4.xml","form_type":"4"}},{"id":863117,"issuer":{"id":399,"kind":"organization","name":"WILLIS LEASE FINANCE CORP","symbol":"WLFC"},"owners":[{"id":1819,"kind":"person","name":"Willis Austin Chandler","position":1,"cik":"0001453104","reported_name":"Willis Austin Chandler","relationship":{"director":true,"officer":true,"ten_percent_owner":true,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Common Stock","published_at":"2026-03-04T21:15:40.000Z","date":"2026-03-02","kind":"sale","planned":true,"acquired":false,"shares":961,"price":194.4479,"value":186864.4319,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on June 3, 2025."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"This transaction was executed in multiple trades at prices ranging from $194.01 to $194.76, inclusive. The price reported reflects the weighted average sale price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares sold at each separate price within the range set forth in footnote (2) of this Form 4."}],"balance_after":183785,"source":{"system":"sec-edgar","filing":"0000905148-26-001141","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1018164/000090514826001141/form4.xml","form_type":"4"}},{"id":920056,"issuer":{"id":399,"kind":"organization","name":"WILLIS LEASE FINANCE CORP","symbol":"WLFC"},"owners":[{"id":1819,"kind":"person","name":"Willis Austin Chandler","position":1,"cik":"0001453104","reported_name":"Willis Austin Chandler","relationship":{"director":true,"officer":true,"ten_percent_owner":true,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Common Stock","published_at":"2026-02-04T21:18:20.000Z","date":"2026-02-02","kind":"sale","planned":true,"acquired":false,"shares":260,"price":187.4485,"value":48736.61,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on June 3, 2025."},{"field":"price","element":"transactionPricePerShare","label":"F5","text":"This transaction was executed in multiple trades at prices ranging from $187.31 to $187.49, inclusive. The price reported reflects the weighted average sale price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares sold at each separate price within the range set forth in footnote (5) of this Form 4."}],"balance_after":184746,"source":{"system":"sec-edgar","filing":"0000905148-26-000494","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":5,"url":"https://www.sec.gov/Archives/edgar/data/1018164/000090514826000494/form4.xml","form_type":"4"}},{"id":920055,"issuer":{"id":399,"kind":"organization","name":"WILLIS LEASE FINANCE CORP","symbol":"WLFC"},"owners":[{"id":1819,"kind":"person","name":"Willis Austin Chandler","position":1,"cik":"0001453104","reported_name":"Willis Austin Chandler","relationship":{"director":true,"officer":true,"ten_percent_owner":true,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Common Stock","published_at":"2026-02-04T21:18:20.000Z","date":"2026-02-02","kind":"sale","planned":true,"acquired":false,"shares":1140,"price":186.6691,"value":212802.774,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on June 3, 2025."},{"field":"price","element":"transactionPricePerShare","label":"F4","text":"This transaction was executed in multiple trades at prices ranging from $186.16 to $186.95, inclusive. The price reported reflects the weighted average sale price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares sold at each separate price within the range set forth in footnote (4) of this Form 4."}],"balance_after":185006,"source":{"system":"sec-edgar","filing":"0000905148-26-000494","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/1018164/000090514826000494/form4.xml","form_type":"4"}},{"id":920054,"issuer":{"id":399,"kind":"organization","name":"WILLIS LEASE FINANCE CORP","symbol":"WLFC"},"owners":[{"id":1819,"kind":"person","name":"Willis Austin Chandler","position":1,"cik":"0001453104","reported_name":"Willis Austin Chandler","relationship":{"director":true,"officer":true,"ten_percent_owner":true,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Common Stock","published_at":"2026-02-04T21:18:20.000Z","date":"2026-02-02","kind":"sale","planned":true,"acquired":false,"shares":1200,"price":185.5008,"value":222600.96,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on June 3, 2025."},{"field":"price","element":"transactionPricePerShare","label":"F3","text":"This transaction was executed in multiple trades at prices ranging from $185.00 to $185.87, inclusive. The price reported reflects the weighted average sale price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares sold at each separate price within the range set forth in footnote (3) of this Form 4."}],"balance_after":186146,"source":{"system":"sec-edgar","filing":"0000905148-26-000494","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1018164/000090514826000494/form4.xml","form_type":"4"}},{"id":920053,"issuer":{"id":399,"kind":"organization","name":"WILLIS LEASE FINANCE CORP","symbol":"WLFC"},"owners":[{"id":1819,"kind":"person","name":"Willis Austin Chandler","position":1,"cik":"0001453104","reported_name":"Willis Austin Chandler","relationship":{"director":true,"officer":true,"ten_percent_owner":true,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Common Stock","published_at":"2026-02-04T21:18:20.000Z","date":"2026-02-02","kind":"sale","planned":true,"acquired":false,"shares":600,"price":184.6358,"value":110781.48,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on June 3, 2025."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"This transaction was executed in multiple trades at prices ranging from $184.00 to $184.91, inclusive. The price reported reflects the weighted average sale price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares sold at each separate price within the range set forth in footnote (2) of this Form 4."}],"balance_after":187346,"source":{"system":"sec-edgar","filing":"0000905148-26-000494","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1018164/000090514826000494/form4.xml","form_type":"4"}},{"id":920052,"issuer":{"id":399,"kind":"organization","name":"WILLIS LEASE FINANCE CORP","symbol":"WLFC"},"owners":[{"id":1819,"kind":"person","name":"Willis Austin Chandler","position":1,"cik":"0001453104","reported_name":"Willis Austin Chandler","relationship":{"director":true,"officer":true,"ten_percent_owner":true,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Common Stock","published_at":"2026-02-04T21:18:20.000Z","date":"2026-02-02","kind":"sale","planned":true,"acquired":false,"shares":200,"price":183,"value":36600.0,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on June 3, 2025."}],"balance_after":187946,"source":{"system":"sec-edgar","filing":"0000905148-26-000494","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1018164/000090514826000494/form4.xml","form_type":"4"}},{"id":922832,"issuer":{"id":399,"kind":"organization","name":"WILLIS LEASE FINANCE CORP","symbol":"WLFC"},"owners":[{"id":23058,"kind":"person","name":"Dameron Clifton","position":1,"cik":"0002070403","reported_name":"Dameron Clifton","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"SVP, GC & Corporate Secretary"}}],"security":"Common Stock","published_at":"2026-02-03T18:31:16.000Z","date":"2026-01-30","kind":"grant","planned":false,"acquired":true,"shares":185,"price":114.75,"value":21228.75,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Shares acquired pursuant to employee's participation in the Company's ESPP."}],"balance_after":12521,"source":{"system":"sec-edgar","filing":"0002070403-26-000007","document":"wk-form4_1770143473.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1018164/000207040326000007/wk-form4_1770143473.xml","form_type":"4"}}],"next_cursor":"2026-02-03T18:31:16.000000Z,922832"}