X0508 4 2025-06-03 0001018164 WILLIS LEASE FINANCE CORP WLFC 0001033309 WILLIS CHARLES F IV 4700 LYONS TECHNOLOGY PARKWAY COCONUT CREEK FL 33073 true true true Executive Chairman false Common Stock 2025-06-03 4 S 0 7348 137.8066 D 999698 D Common Stock 2025-06-03 4 S 0 802 138.7996 D 998896 D Common Stock 2025-06-03 4 S 0 600 140.26 D 998296 D Common Stock 2025-06-04 4 S 0 2105 134.8051 D 996191 D Common Stock 2025-06-04 4 S 0 4742 135.3543 D 991449 D Common Stock 2025-06-04 4 S 0 3586 136.945 D 987863 D Common Stock 2025-06-04 4 S 0 510 137.573 D 987353 D Common Stock 2025-06-04 4 S 0 307 138.5038 D 987046 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 $137.33 to $138.235, 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 $138.38 to $139.14, 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 $134.02 to $135.015, 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 $135.025 to $135.85, 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 (4) of this Form 4. This transaction was executed in multiple trades at prices ranging from $136.20 to $137.16, 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 $137.28 to $137.79, 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 $138.29 to $138.80, 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 (7) of this Form 4. Charlotte Montressor Willis. Wilder Grace Willis 2016 Trust. /s/ Charles F. Willis IV 2025-06-05