X0609 4 2026-03-18 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 2026-03-18 4 S false 238 167.5501 D 13560 I Spouse Common Stock 2026-03-30 4 S false 1859 162.5404 D 931375 D Common Stock 2026-03-30 4 S false 1205 163.3944 D 930170 D Common Stock 2026-03-30 4 S false 1235 164.3783 D 928935 D Common Stock 2026-03-30 4 S false 1091 166.7082 D 927844 D Common Stock 2026-03-30 4 S false 331 167.987 D 927513 D Common Stock 2026-03-31 4 S false 945 165.1134 D 926568 D Common Stock 2026-03-31 4 S false 600 166.51 D 925968 D Common Stock 2026-03-31 4 S false 1300 169.5217 D 924668 D Common Stock 2026-03-31 4 S false 437 170.4882 D 924231 D Common Stock 2134148 I CFW Partners Common Stock 584 I Granddaughter Charlotte Montressor Willis. This transaction was executed in multiple trades at prices ranging from $161.91 to $162.90, 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. This transaction was executed in multiple trades at prices ranging from $163.00 to $163.975, 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 $164.01 to $164.81, 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 $166.41 to $167.12, 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 $167.50 to $168.36, 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 $164.97 to $165.46, 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 $166.10 to $166.90, 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 (8) of this Form 4. This transaction was executed in multiple trades at prices ranging from $169.005 to $170.00, 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 (9) of this Form 4. This transaction was executed in multiple trades at prices ranging from $170.09 to $170.67, 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. Wilder Grace Willis 2016 Trust. /s/ Charles F. Willis IV 2026-04-01