X0609 4 2026-03-25 0001018164 WILLIS LEASE FINANCE CORP WLFC 0001033309 WILLIS CHARLES F IV false 4700 LYONS TECHNOLOGY COCONUT CREEK FL 33073 true true true false Executive Chairman false Common Stock 2026-03-25 4 S false 1000 175.922 D 948231 D Common Stock 2026-03-25 4 S false 1000 177.567 D 947231 D Common Stock 2026-03-26 4 S false 3170 171.3549 D 944061 D Common Stock 2026-03-26 4 S false 200 172.316 D 943861 D Common Stock 2026-03-26 4 S false 100 173.5 D 943761 D Common Stock 2026-03-26 4 S false 800 175.18 D 942961 D Common Stock 2026-03-27 4 S false 478 168.023 D 942483 D Common Stock 2026-03-27 4 S false 1531 168.9933 D 940952 D Common Stock 2026-03-27 4 S false 5652 170.2617 D 935300 D Common Stock 2026-03-27 4 S false 2066 170.9033 D 933234 D Common Stock 13798 I Spouse Common Stock 2134148 I CFW Partners Common Stock 584 I Granddaughter This transaction was executed in multiple trades at prices ranging from $175.84 to $176.165, 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. This transaction was executed in multiple trades at prices ranging from $177.45 to $177.77, 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. This transaction was executed in multiple trades at prices ranging from $170.86 to $171.85, 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. This transaction was executed in multiple trades at prices ranging from $172.30 to $172.42, 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 (4) of this Form 4. This transaction was executed in multiple trades at prices ranging from $167.57 to $168.47, 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. This transaction was executed in multiple trades at prices ranging from $168.60 to $169.59, 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. This transaction was executed in multiple trades at prices ranging from $169.64 to $170.63, 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. This transaction was executed in multiple trades at prices ranging from $170.645 to $171.50, 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. Charlotte Montressor Willis. Wilder Grace Willis 2016 Trust. /s/ Charles F. Willis IV 2026-03-27